From ad04490ef84d7565fbec0fa878a21694ad2d61f0 Mon Sep 17 00:00:00 2001
From: pryazha <pryadeiniv@mail.ru>
Date: Tue, 26 Aug 2025 10:55:18 +0500
Subject: guess that's all

---
 .gitignore                                         |   9 +
 advanced_lighting/6.hdr/hdr.c                      |   4 +-
 in_practice/breakout/Ac437_IBM_VGA_9x16.ttf        | Bin 0 -> 26004 bytes
 in_practice/breakout/audio.c                       |  14 +
 in_practice/breakout/audio.h                       |  18 +
 in_practice/breakout/audio/background.wav          | Bin 0 -> 21173934 bytes
 in_practice/breakout/audio/powerup.wav             | Bin 0 -> 240614 bytes
 in_practice/breakout/audio/solid.wav               | Bin 0 -> 27164 bytes
 in_practice/breakout/audio/tile.wav                | Bin 0 -> 336440 bytes
 in_practice/breakout/ball.c                        |  17 +-
 in_practice/breakout/ball.h                        |  18 +-
 in_practice/breakout/breakout                      | Bin 355952 -> 0 bytes
 in_practice/breakout/build.sh                      |  15 +-
 in_practice/breakout/first.txt                     |   3 -
 in_practice/breakout/fonts/ibm.ttf                 | Bin 0 -> 26004 bytes
 in_practice/breakout/game.c                        | 397 +++++++++++++++++++--
 in_practice/breakout/game.h                        |  43 ++-
 in_practice/breakout/game.o                        | Bin 16296 -> 0 bytes
 in_practice/breakout/input.c                       |  15 +-
 in_practice/breakout/input.h                       |  29 +-
 in_practice/breakout/input.o                       | Bin 4704 -> 0 bytes
 in_practice/breakout/level.c                       |  18 +-
 in_practice/breakout/level.h                       |  15 +-
 in_practice/breakout/levels/first.txt              |   8 +
 in_practice/breakout/levels/second.txt             |   8 +
 in_practice/breakout/levels/third.txt              |   3 +
 in_practice/breakout/linux.c                       |  93 ++++-
 in_practice/breakout/linux.o                       | Bin 38976 -> 0 bytes
 in_practice/breakout/my_math.c                     |  61 +++-
 in_practice/breakout/my_math.h                     |  13 +-
 in_practice/breakout/my_math.o                     | Bin 11328 -> 0 bytes
 in_practice/breakout/object.c                      |  10 +-
 in_practice/breakout/object.h                      |   8 +-
 in_practice/breakout/object.o                      | Bin 4424 -> 0 bytes
 in_practice/breakout/particle.c                    | 104 ++++++
 in_practice/breakout/particle.h                    |  38 ++
 in_practice/breakout/post_processor.c              | 109 ++++++
 in_practice/breakout/post_processor.h              |  25 ++
 in_practice/breakout/powerup.c                     |  31 ++
 in_practice/breakout/powerup.h                     |  36 ++
 in_practice/breakout/shader.c                      |  19 +
 in_practice/breakout/shader.h                      |   3 +
 in_practice/breakout/shader.o                      | Bin 11912 -> 0 bytes
 in_practice/breakout/shaders/particle.frag         |  15 +
 in_practice/breakout/shaders/particle.vert         |  20 ++
 in_practice/breakout/shaders/post.frag             |  38 ++
 in_practice/breakout/shaders/post.vert             |  33 ++
 in_practice/breakout/shaders/text.frag             |  16 +
 in_practice/breakout/shaders/text.vert             |  15 +
 in_practice/breakout/sprite.c                      |   6 +-
 in_practice/breakout/sprite.h                      |   8 +-
 in_practice/breakout/sprite.o                      | Bin 10272 -> 0 bytes
 in_practice/breakout/sys.h                         |  12 +-
 in_practice/breakout/sys.o                         | Bin 9560 -> 0 bytes
 in_practice/breakout/text.c                        | 127 +++++++
 in_practice/breakout/text.h                        |  27 ++
 in_practice/breakout/texture.c                     |   2 +-
 in_practice/breakout/texture.h                     |   4 +-
 in_practice/breakout/texture.o                     | Bin 259232 -> 0 bytes
 in_practice/breakout/textures/particle.png         | Bin 0 -> 18912 bytes
 in_practice/breakout/textures/powerup_chaos.png    | Bin 0 -> 31586 bytes
 in_practice/breakout/textures/powerup_confuse.png  | Bin 0 -> 25342 bytes
 in_practice/breakout/textures/powerup_increase.png | Bin 0 -> 18972 bytes
 .../breakout/textures/powerup_passthrough.png      | Bin 0 -> 18356 bytes
 in_practice/breakout/textures/powerup_speed.png    | Bin 0 -> 21825 bytes
 in_practice/breakout/textures/powerup_sticky.png   | Bin 0 -> 15379 bytes
 66 files changed, 1376 insertions(+), 131 deletions(-)
 create mode 100644 in_practice/breakout/Ac437_IBM_VGA_9x16.ttf
 create mode 100644 in_practice/breakout/audio.c
 create mode 100644 in_practice/breakout/audio.h
 create mode 100644 in_practice/breakout/audio/background.wav
 create mode 100644 in_practice/breakout/audio/powerup.wav
 create mode 100644 in_practice/breakout/audio/solid.wav
 create mode 100644 in_practice/breakout/audio/tile.wav
 delete mode 100755 in_practice/breakout/breakout
 delete mode 100644 in_practice/breakout/first.txt
 create mode 100644 in_practice/breakout/fonts/ibm.ttf
 delete mode 100644 in_practice/breakout/game.o
 delete mode 100644 in_practice/breakout/input.o
 create mode 100644 in_practice/breakout/levels/first.txt
 create mode 100644 in_practice/breakout/levels/second.txt
 create mode 100644 in_practice/breakout/levels/third.txt
 delete mode 100644 in_practice/breakout/linux.o
 delete mode 100644 in_practice/breakout/my_math.o
 delete mode 100644 in_practice/breakout/object.o
 create mode 100644 in_practice/breakout/particle.c
 create mode 100644 in_practice/breakout/particle.h
 create mode 100644 in_practice/breakout/post_processor.c
 create mode 100644 in_practice/breakout/post_processor.h
 create mode 100644 in_practice/breakout/powerup.c
 create mode 100644 in_practice/breakout/powerup.h
 delete mode 100644 in_practice/breakout/shader.o
 create mode 100644 in_practice/breakout/shaders/particle.frag
 create mode 100644 in_practice/breakout/shaders/particle.vert
 create mode 100644 in_practice/breakout/shaders/post.frag
 create mode 100644 in_practice/breakout/shaders/post.vert
 create mode 100644 in_practice/breakout/shaders/text.frag
 create mode 100644 in_practice/breakout/shaders/text.vert
 delete mode 100644 in_practice/breakout/sprite.o
 delete mode 100644 in_practice/breakout/sys.o
 create mode 100644 in_practice/breakout/text.c
 create mode 100644 in_practice/breakout/text.h
 delete mode 100644 in_practice/breakout/texture.o
 create mode 100644 in_practice/breakout/textures/particle.png
 create mode 100644 in_practice/breakout/textures/powerup_chaos.png
 create mode 100644 in_practice/breakout/textures/powerup_confuse.png
 create mode 100644 in_practice/breakout/textures/powerup_increase.png
 create mode 100644 in_practice/breakout/textures/powerup_passthrough.png
 create mode 100644 in_practice/breakout/textures/powerup_speed.png
 create mode 100644 in_practice/breakout/textures/powerup_sticky.png

diff --git a/.gitignore b/.gitignore
index ed9677a..551efe3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,3 +16,12 @@ advanced_lighting/3.2.point_shadows/point_shadows
 advanced_lighting/4.normal_mapping/normal_mapping
 advanced_lighting/6.hdr/hdr
 advanced_lighting/5.parallax_mapping/parallax_mapping
+advanced_lighting/7.bloom/bloom
+advanced_lighting/8.deferred_shading/deferred
+advanced_lighting/9.ssao/ssao
+in_practice/breakout/breakout
+pbr/ibl_irradiance/ibl_irradiance
+pbr/ibl_irradiance_conversion/ibl_irradiance_conversion
+pbr/ibl_specular/ibl_specular
+pbr/lighting/lighting
+pbr/textured/textured
diff --git a/advanced_lighting/6.hdr/hdr.c b/advanced_lighting/6.hdr/hdr.c
index 655ab06..9177b8b 100644
--- a/advanced_lighting/6.hdr/hdr.c
+++ b/advanced_lighting/6.hdr/hdr.c
@@ -70,7 +70,7 @@ int main(void)
 
 	/* NOTE(pryazha): Create HDR framebuffer, color buffer texture and
 	 * renderbuffer */
-    U32 hdrfbo, hdrcolorbuf;
+	U32 hdrfbo, hdrcolorbuf;
 	glGenFramebuffers(1, &hdrfbo);
 	glGenTextures(1, &hdrcolorbuf);
 	glBindTexture(GL_TEXTURE_2D, hdrcolorbuf);
@@ -78,7 +78,7 @@ int main(void)
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 
-    U32 hdrrbo;
+	U32 hdrrbo;
 	glGenRenderbuffers(1, &hdrrbo);
 	glBindRenderbuffer(GL_RENDERBUFFER, hdrrbo);
 	glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, width, height);
diff --git a/in_practice/breakout/Ac437_IBM_VGA_9x16.ttf b/in_practice/breakout/Ac437_IBM_VGA_9x16.ttf
new file mode 100644
index 0000000..5cc1f3d
Binary files /dev/null and b/in_practice/breakout/Ac437_IBM_VGA_9x16.ttf differ
diff --git a/in_practice/breakout/audio.c b/in_practice/breakout/audio.c
new file mode 100644
index 0000000..2a62de4
--- /dev/null
+++ b/in_practice/breakout/audio.c
@@ -0,0 +1,14 @@
+#include "audio.h"
+
+#include <string.h>
+
+struct sound sounds[max_sounds] = {0};
+
+i32 get_sound(const char *name)
+{
+	for (i32 i = 0; i < max_sounds; i++) {
+		if (sounds[i].name && strstr(sounds[i].name, name))
+			return i;
+	}
+	return -1;
+}
diff --git a/in_practice/breakout/audio.h b/in_practice/breakout/audio.h
new file mode 100644
index 0000000..71b232f
--- /dev/null
+++ b/in_practice/breakout/audio.h
@@ -0,0 +1,18 @@
+#ifndef AUDIO_H
+#define AUDIO_H
+
+#include "types.h"
+
+struct sound {
+	u8 *data;
+	u32 size;
+	const char *name;
+	i32 loop;
+};
+
+#define max_sounds 8
+extern struct sound sounds[max_sounds];
+
+i32 get_sound(const char *name);
+
+#endif
diff --git a/in_practice/breakout/audio/background.wav b/in_practice/breakout/audio/background.wav
new file mode 100644
index 0000000..2ec2882
Binary files /dev/null and b/in_practice/breakout/audio/background.wav differ
diff --git a/in_practice/breakout/audio/powerup.wav b/in_practice/breakout/audio/powerup.wav
new file mode 100644
index 0000000..bf0a0cd
Binary files /dev/null and b/in_practice/breakout/audio/powerup.wav differ
diff --git a/in_practice/breakout/audio/solid.wav b/in_practice/breakout/audio/solid.wav
new file mode 100644
index 0000000..1fa2fc4
Binary files /dev/null and b/in_practice/breakout/audio/solid.wav differ
diff --git a/in_practice/breakout/audio/tile.wav b/in_practice/breakout/audio/tile.wav
new file mode 100644
index 0000000..3cead3a
Binary files /dev/null and b/in_practice/breakout/audio/tile.wav differ
diff --git a/in_practice/breakout/ball.c b/in_practice/breakout/ball.c
index 9aa42a2..1ec502e 100644
--- a/in_practice/breakout/ball.c
+++ b/in_practice/breakout/ball.c
@@ -1,6 +1,6 @@
 #include "ball.h"
 
-void move_ball(ball_t *ball, f32 dt, i32 width)
+void move_ball(struct ball *ball, f32 dt, i32 width)
 {
 	if (ball->stuck) 
 		return;
@@ -18,7 +18,18 @@ void move_ball(ball_t *ball, f32 dt, i32 width)
 		ball->o.pos.y = 0.0f;
 	}
 }
-	
-void reset_ball(ball_t *ball, v2 pos, v2 vel)
+
+struct collision check_ball_collision(struct ball ball, struct object obj)
 {
+	v2 ball_center = add_v2(ball.o.pos, v2a(ball.radius));
+	v2 obj_half_size = scale_v2(obj.size, 0.5f);
+	v2 obj_center = add_v2(obj.pos, obj_half_size);
+	v2 diff = sub_v2(ball_center, obj_center);
+	v2 clamped = clamp_v2(diff, scale_v2(obj_half_size, -1.0f), obj_half_size);
+	v2 closest = add_v2(obj_center, clamped);
+	diff = sub_v2(closest, ball_center);
+	struct collision collision = {0};
+	if (length_v2(diff) <= ball.radius)
+		collision = (struct collision){1, direction_v2(diff), diff};
+	return collision;
 }
diff --git a/in_practice/breakout/ball.h b/in_practice/breakout/ball.h
index f33773a..60654a3 100644
--- a/in_practice/breakout/ball.h
+++ b/in_practice/breakout/ball.h
@@ -4,13 +4,21 @@
 #include "object.h"
 #include "types.h"
 
-typedef struct {
-	object_t o;
+struct ball {
+	struct object o;
 	f32 radius;
 	i32 stuck;
-} ball_t;
+	i32 sticky;
+	i32 pass;
+};
 
-extern void move_ball(ball_t *ball, f32 dt, i32 width);
-extern void reset_ball(ball_t *ball, v2 pos, v2 vel);
+struct collision {
+	i32 collide;
+	direction_enum dir;
+	v2 diff;
+};
+
+void move_ball(struct ball *ball, f32 dt, i32 width);
+struct collision check_ball_collision(struct ball ball, struct object obj);
 
 #endif
diff --git a/in_practice/breakout/breakout b/in_practice/breakout/breakout
deleted file mode 100755
index a9cb77c..0000000
Binary files a/in_practice/breakout/breakout and /dev/null differ
diff --git a/in_practice/breakout/build.sh b/in_practice/breakout/build.sh
index 63e4b93..1cd66f0 100755
--- a/in_practice/breakout/build.sh
+++ b/in_practice/breakout/build.sh
@@ -1,7 +1,8 @@
 #!/bin/sh
 
+include='-I../include -I/usr/include/freetype2'
 cflags='-g -Wall'
-libs='-lSDL3 -lGLEW -lGL -lm'
+libs='-lSDL3 -lGLEW -lGL -lm -lfreetype'
 src='
 game.c
 input.c
@@ -15,8 +16,18 @@ sys.c
 texture.c
 gl_utils.c
 ball.c
+particle.c
+post_processor.c
+powerup.c
+audio.c
+text.c
 '
 
+dir=$(dirname $0)
+pushd $dir
+
 set -x
 
-gcc -o breakout $cflags $src $libs
+gcc -o breakout $cflags $include $src $libs
+
+popd
diff --git a/in_practice/breakout/first.txt b/in_practice/breakout/first.txt
deleted file mode 100644
index a46885b..0000000
--- a/in_practice/breakout/first.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-1 1 1 1 1
-2 3 0 3 2
-2 4 2 4 2
diff --git a/in_practice/breakout/fonts/ibm.ttf b/in_practice/breakout/fonts/ibm.ttf
new file mode 100644
index 0000000..5cc1f3d
Binary files /dev/null and b/in_practice/breakout/fonts/ibm.ttf differ
diff --git a/in_practice/breakout/game.c b/in_practice/breakout/game.c
index cf3c0a2..3a84f01 100644
--- a/in_practice/breakout/game.c
+++ b/in_practice/breakout/game.c
@@ -9,8 +9,11 @@
 
 #include <stdio.h>
 #include <math.h>
+#include <stdlib.h>
 
-static void init_gl(game_t game)
+static v2 initial_ball_velocity = {100.0f, -350.0f};	
+
+static void init_gl(struct game game)
 {
 	i32 flags;
 	glGetIntegerv(GL_CONTEXT_FLAGS, &flags);
@@ -27,56 +30,360 @@ static void init_gl(game_t game)
 	glClearColor(0.16f, 0.16f, 0.16f, 1.0f);
 }
 
-game_t init_game(i32 width, i32 height)
+static void reset_powerups(struct game *game)
+{
+	for (i32 i = 0; i < max_powerups; i++) {
+		game->powerups[i].type = powerup_none;
+		game->powerups[i].destroyed = 1;
+	}
+}
+
+struct game init_game(i32 width, i32 height)
 {
-	game_t game = {0};
-	game.state = game_active;
+	struct game game = {0};
+	game.state = game_menu;
 	game.running = 1;
 	game.width = width;
 	game.height = height;
 	game.input = init_input();
 	init_gl(game);
 	game.bindir = get_bin_dir();
+
 	char dir[512] = {0};
 	snprintf(dir, 512, "%s/%s", game.bindir, "shaders");
-	u32 shader = load_shader(dir, "shader.vert", "shader.frag", 0, "shader");
-	glUseProgram(shader);
+	load_shader(dir, "shader.vert", "shader.frag", 0, "shader");
+	load_shader(dir, "particle.vert", "particle.frag", 0, "particle");
+	load_shader(dir, "post.vert", "post.frag", 0, "post");
+	load_shader(dir, "text.vert", "text.frag", 0, "text");
+
 	mat projection = ortho(0.0f, game.width, game.height, 0.0f, -1.0f, 1.0f);
+	u32 shader = get_shader("shader");
+	glUseProgram(shader);
+	uniform_mat(shader, "projection", projection);
+	glUseProgram(0);
+	shader = get_shader("particle");
+	glUseProgram(shader);
 	uniform_mat(shader, "projection", projection);
 	glUseProgram(0);
+
 	snprintf(dir, 512, "%s/%s", game.bindir, "textures");
 	load_texture(dir, "gentleman.jpg", "gentleman", 0);
 	load_texture(dir, "block.png", "block", 0);
 	load_texture(dir, "solid.png", "solid", 0);
 	load_texture(dir, "paddle.png", "paddle", 1);
 	load_texture(dir, "ball.png", "ball", 1);
-	game.renderer = init_renderer(shader);
+	load_texture(dir, "particle.png", "particle", 1);
+	load_texture(dir, "powerup_chaos.png", "powerup_chaos", 1);
+	load_texture(dir, "powerup_confuse.png", "powerup_confuse", 1);
+	load_texture(dir, "powerup_increase.png", "powerup_increase", 1);
+	load_texture(dir, "powerup_passthrough.png", "powerup_passthrough", 1);
+	load_texture(dir, "powerup_speed.png", "powerup_speed", 1);
+	load_texture(dir, "powerup_sticky.png", "powerup_sticky", 1);
+
+	game.renderer = init_renderer(get_shader("shader"));
+
 	snprintf(dir, 512, "%s/%s", game.bindir, "levels");
-	game.level = load_level(0, "first.txt", game.width, game.height / 2.0f);
-	game.player = (object_t)default_object;
+	game.levels[0] = load_level(dir, "first.txt", game.width, game.height / 2.0f);
+	game.levels[1] = load_level(dir, "second.txt", game.width, game.height / 2.0f);
+	game.levels[2] = load_level(dir, "third.txt", game.width, game.height / 2.0f);
+
+	snprintf(dir, 512, "%s/%s", game.bindir, "audio");
+	load_wav(dir, "background.wav", "back");
+	load_wav(dir, "solid.wav", "solid");
+	load_wav(dir, "tile.wav", "tile");
+	load_wav(dir, "powerup.wav", "powerup");
+	play_audio("back", 1);
+
+	game.text_renderer = init_text_renderer(game.width, game.height);
+	snprintf(dir, 512, "%s/%s", game.bindir, "fonts");
+	load_font(&game.text_renderer, dir, "ibm.ttf", 32);
+
+	game.player = (struct object)default_object;
 	v2 size = get_texture_size("paddle");
-	game.player.size = scale_v2(size, 0.4f); 
-	game.player.pos = (v2){width / 2.0f - game.player.size.x / 2.0f, height - game.player.size.y};
-	game.player.vel = v2a(500.0f);
+	game.player.size = scale_v2(size, 0.2f); 
+	game.player.pos = (v2){
+		game.width / 2.0f - game.player.size.x / 2.0f,
+		game.height - game.player.size.y
+	};
+	game.player.vel = (v2){200.0f, 0.0f};
 	game.player.texture = get_texture_id("paddle");
-	game.ball.o = (object_t)default_object;
+	game.lives = 3;
+	game.ball.o = (struct object)default_object;
 	game.ball.radius = 12.5f;
 	game.ball.o.size = v2a(2.0f * game.ball.radius);
-	game.ball.o.pos = (v2){game.player.pos.x + game.player.size.x / 2.0f - game.ball.o.size.x / 2.0f, game.player.pos.y - game.ball.o.size.y};
-	game.ball.o.vel = (v2){100.0f, -350.0f};
+	game.ball.o.pos = (v2){
+		game.player.pos.x + game.player.size.x / 2.0f - game.ball.o.size.x / 2.0f,
+		game.player.pos.y - game.ball.o.size.y
+	};
+	game.ball.o.vel = initial_ball_velocity;
 	game.ball.o.texture = get_texture_id("ball");
 	game.ball.stuck = 1;
+	game.generator = init_generator(2, get_shader("particle"), get_texture_id("particle"));
+	game.post_processor = init_post_processor(game.width, game.height, get_shader("post"));
+	reset_powerups(&game);
 	return game;
 }
 
-void process_input(game_t *game)
+static void reset_level(struct game *game)
+{
+	for (i32 i = 0; i < game->levels[game->level].count; i++)
+		game->levels[game->level].tiles[i].destroyed = 0;
+	game->lives = 3;
+}
+
+static void reset_player(struct game *game)
+{
+	game->player.pos = (v2){
+		game->width / 2.0f - game->player.size.x / 2.0f,
+			game->height - game->player.size.y
+	};
+	game->ball.o.pos = (v2){
+		game->player.pos.x + game->player.size.x / 2.0f - game->ball.o.size.x / 2.0f,
+			game->player.pos.y - game->ball.o.size.y
+	};
+	game->ball.o.vel = initial_ball_velocity;
+	game->ball.stuck = 1;
+}
+
+void process_input(struct game *game)
 {
 	if (key_first_press(game->input.escape))
 		game->running = 0;
+	if (key_first_press(game->input.start)) {
+		if (game->state == game_menu)
+			game->state = game_active;
+		else if (game->state == game_win) {
+			game->post_processor.chaos = 0;
+			game->state = game_menu;
+		}
+		else if (game->state == game_active) {
+			game->state = game_menu;
+		}
+	}
+	if (game->state != game_menu)
+		return;
+	if (key_first_press(game->input.up)) {
+		game->level = (game->level + 1) % max_levels;
+		if (!game->levels[game->level].tiles)
+			game->level--;
+		reset_level(game);
+		reset_player(game);
+	}
+	if (key_first_press(game->input.down)) {
+		i32 new = game->level - 1;
+		if (new == -1)
+			new = max_levels - 1;
+		if (game->levels[new].tiles) {
+			game->level = new;
+			reset_level(game);
+			reset_player(game);
+		}
+	}
+}
+
+static i32 should_spawn(u32 chance)
+{
+	u32 random = rand() % chance;
+	return random == 0;
+}
+
+static i32 can_spawn_powerup(struct game *game)
+{
+	for (i32 i = 0; i < max_powerups; i++)
+		if (game->powerups[i].type == powerup_none)
+			return 1;
+	return 0;
+}
+
+static void spawn_powerups(struct game *game, v2 pos)
+{
+	if (!can_spawn_powerup(game))
+		return;
+	struct powerup *powerup;
+	for (i32 i = 0; i < max_powerups; i++) {
+		powerup = game->powerups + i;
+		if (powerup->type == powerup_none) {
+			break;
+		}
+	}
+	if (should_spawn(75)) {
+		*powerup = spawn_powerup(pos, (v3){0.5f, 0.5f, 1.0f},
+			powerup_speed, 0.0f, get_texture_id("powerup_speed"));
+		return;
+	}
+	if (should_spawn(75)) {
+		*powerup = spawn_powerup(pos, (v3){1.0f, 0.5f, 1.0f},
+			powerup_sticky, 20.0f, get_texture_id("powerup_sticky"));
+		return;
+	}
+	if (should_spawn(75)) {
+		*powerup = spawn_powerup(pos, (v3){0.5f, 1.0f, 0.5f},
+			powerup_pass, 10.0f, get_texture_id("powerup_pass"));
+		return;
+	}
+	if (should_spawn(75)) {
+		*powerup = spawn_powerup(pos, (v3){1.0f, 0.6f, 0.4f},
+			powerup_increase, 0.0f, get_texture_id("powerup_increase"));
+		return;
+	}
+	if (should_spawn(15)) {
+		*powerup = spawn_powerup(pos, (v3){1.0f, 0.3f, 0.3f},
+			powerup_confuse, 15.0f, get_texture_id("powerup_confuse"));
+		return;
+	}
+	if (should_spawn(15)) {
+		*powerup = spawn_powerup(pos, (v3){0.9f, 0.25f, 0.25f},
+			powerup_chaos, 15.0f, get_texture_id("powerup_chaos"));
+		return;
+	}
+}
+
+static void activate_powerup(struct game *game, struct powerup powerup)
+{
+	switch (powerup.type) {
+	case powerup_speed:
+		game->ball.o.vel = scale_v2(game->ball.o.vel, 1.2f);
+		break;
+	case powerup_sticky:
+		game->ball.sticky = 1;
+		game->player.color = (v3){1.0f, 0.5f, 1.0f};
+		break;
+	case powerup_pass:
+		game->ball.pass = 1;
+		game->ball.o.color = (v3){1.0f, 0.5f, 0.5f};
+		break;
+	case powerup_increase:
+		game->player.size.x += 50.0f;
+		break;
+	case powerup_confuse:
+		if (!game->post_processor.confuse)
+			game->post_processor.confuse = 1;
+		break;
+	case powerup_chaos:
+		if (!game->post_processor.chaos)
+			game->post_processor.chaos = 1;
+		break;
+	default:
+		break;
+	}
+}
+
+static void process_tile_collision(struct object *tile, struct game *game)
+{
+	if (tile->destroyed)
+		return;
+       	struct collision collision = check_ball_collision(game->ball, *tile);
+	if (!collision.collide)
+		return;
+	if (!tile->solid) {
+		tile->destroyed = 1;
+		v2 pos = sub_v2(add_v2(tile->pos, scale_v2(tile->size, 0.5f)),
+		scale_v2(default_powerup_size, 0.5f));
+		spawn_powerups(game, pos);
+	} else {
+		game->shake_time = 0.05f;
+		game->post_processor.shake = 1;
+	}
+	direction_enum dir = collision.dir;
+	v2 diff = collision.diff;
+	if (game->ball.pass && !tile->solid)
+		return;
+	if (dir == direction_left || dir == direction_right) {
+		game->ball.o.vel.x = -game->ball.o.vel.x;
+		f32 offset = game->ball.radius - abs(diff.x);
+		game->ball.o.pos.x += (dir == direction_left) ? offset : -offset;
+	} else {
+		game->ball.o.vel.y = -game->ball.o.vel.y;
+		f32 offset = game->ball.radius - abs(diff.y);
+		game->ball.o.pos.y += (dir == direction_up) ? -offset : offset;
+	}
+	if (tile->solid)
+		play_audio("solid", 0);
+	else
+		play_audio("tile", 0);
+}
+
+static void process_powerup_collisions(struct game *game, struct powerup *powerup)
+{
+	if (powerup->destroyed)
+		return;
+	if (powerup->pos.y >= game->height) {
+		powerup->destroyed = 1;
+		powerup->active = 0;
+		powerup->type = powerup_none;
+	}
+	if (check_powerup_collision(*powerup, game->player)) {
+		activate_powerup(game, *powerup);
+		powerup->destroyed = 1;
+		powerup->active = 1;
+		play_audio("powerup", 0);
+	}
+}
+
+static void check_collisions(struct game *game)
+{
+	for (i32 i = 0; i < game->levels[game->level].count; i++) {
+		struct object *tile = game->levels[game->level].tiles + i;
+		process_tile_collision(tile, game);
+	}
+	struct collision collision = check_ball_collision(game->ball, game->player);
+	if (!game->ball.stuck && collision.collide) {
+		f32 center = game->player.pos.x + game->player.size.x / 2.0f;
+		f32 distance = game->ball.o.pos.x + game->ball.radius - center;
+		f32 percentage = distance / game->player.size.x / 2.0f;
+		f32 strength = 10.0f;
+		v2 old_vel = game->ball.o.vel;
+		game->ball.o.vel.x = initial_ball_velocity.x * percentage * strength;
+		game->ball.o.vel.y = -1.0f * abs(game->ball.o.vel.y);
+		game->ball.o.vel = scale_v2(norm_v2(game->ball.o.vel), length_v2(old_vel));
+		game->ball.stuck = game->ball.sticky;
+		play_audio("tile", 0);
+	}
+	for (i32 i = 0; i < max_powerups; i++) {
+		struct powerup *powerup = game->powerups + i;
+		process_powerup_collisions(game, powerup);
+	}
+}
+
+static void update_powerups(struct game *game, f32 dt)
+{
+	for (i32 i = 0; i < max_powerups; i++) {
+		struct powerup *powerup = game->powerups + i;
+		if (!powerup->destroyed)
+			powerup->pos = add_v2(powerup->pos, scale_v2(powerup->vel, dt));
+		if (powerup->active) {
+			powerup->duration -= dt;
+			if (powerup->duration <= 0.0f) {
+				powerup->duration = 0.0f;
+				powerup->active = 0;
+				switch (powerup->type) {
+				case powerup_sticky:
+					game->ball.sticky = 0;
+					game->player.color = v3a(1.0f);
+					break;
+				case powerup_pass:
+					game->ball.pass = 0;
+					game->ball.o.color = v3a(1.0f);
+					break;
+				case powerup_confuse:
+					game->post_processor.confuse = 0;
+					break;
+				case powerup_chaos:
+					game->post_processor.chaos = 0;
+					break;
+				default:
+					break;
+				}
+				powerup->type = powerup_none;
+			}
+		}
+	}
 }
 
-void update_game(game_t *game, f32 dt)
+void update_game(struct game *game, f32 dt)
 {
+	if ((game->state != game_active) && (game->state != game_win))
+		return;
 	f32 vel = game->player.vel.x * dt;
 	if (game->state == game_active) {
 		if (key_is_pressed(game->input.right)) {
@@ -97,21 +404,59 @@ void update_game(game_t *game, f32 dt)
 			game->ball.stuck = 0;
 	}
 	move_ball(&game->ball, dt, game->width);
-	/* collisions */
-	for (i32 i = 0; i < game->level.count; i++) {
-		object_t *tile = game->level.tiles + i;
-		if (!tile->destroyed && check_collision(game->ball.o, *tile) && (!tile->solid)) {
-			tile->destroyed = 1;
+	check_collisions(game);
+	if (game->ball.o.pos.y >= game->height) {
+		game->lives--;
+		if (game->lives == 0) {
+			reset_level(game);
+			game->state = game_menu;
 		}
+		reset_player(game);
+	}
+	update_particles(&game->generator, game->ball.o, dt, v2a(game->ball.radius / 2.0f));
+	game->time += dt;
+	if (game->shake_time > 0.0f) {
+		game->shake_time -= dt;
+		if (game->shake_time < 0.0f)
+			game->post_processor.shake = 0;
+	}
+	update_powerups(game, dt);
+	if (game->state == game_active && level_is_complete(game->levels[game->level])) {
+		reset_level(game);
+		reset_player(game);
+		game->post_processor.chaos = 1;
+		game->state = game_win;
 	}
 }
 
-void render_game(game_t game)
+static void render_powerups(struct game game)
 {
-	glClear(GL_COLOR_BUFFER_BIT);
-	if (game.state == game_active) {
-		render_level(game.renderer, game.level);
+	for (i32 i = 0; i < max_powerups; i++)
+		if (!game.powerups[i].destroyed)
+			render_powerup(game.renderer, game.powerups[i]);
+}
+
+void render_game(struct game game)
+{
+	if ((game.state == game_active) || (game.state == game_menu) || (game.state == game_win)) {
+		begin_render(game.post_processor);
+		render_level(game.renderer, game.levels[game.level]);
+		render_powerups(game);
 		render_object(game.renderer, game.player);
+		render_particles(game.generator);
 		render_object(game.renderer, game.ball.o);
+		end_render(game.post_processor);
+		render_post(game.post_processor, game.time);
+		char lives_str[512] = {0};
+		snprintf(lives_str, 512, "lives: %d", game.lives);
+		render_text(game.text_renderer, lives_str, v2a(5.0f), 1.0f, v3a(1.0f));
+	}
+	if (game.state == game_menu) {
+		render_text_centered(game.text_renderer, "Press Enter to start", (v2){game.width * 0.5f, game.height * 0.5f}, 1.0f, v3a(1.0f));
+		render_text_centered(game.text_renderer, "Press UP and DOWN to select the level", (v2){game.width * 0.5f, game.height * 0.55f}, 0.75f, v3a(1.0f));
+	}
+	if (game.state == game_win) {
+		render_text_centered(game.text_renderer, "You WON!!!", (v2){game.width * 0.5f, game.height * 0.5f}, 1.0f, v3a(1.0f));
+		render_text_centered(game.text_renderer, "Press Enter to retry or ESC to quit", (v2){game.width * 0.5f, game.height * 0.55f}, 0.75f, v3a(1.0f));
 	}
 }
diff --git a/in_practice/breakout/game.h b/in_practice/breakout/game.h
index 31f5dcd..5bc7abe 100644
--- a/in_practice/breakout/game.h
+++ b/in_practice/breakout/game.h
@@ -6,28 +6,43 @@
 #include "sprite.h"
 #include "level.h"
 #include "ball.h"
+#include "particle.h"
+#include "post_processor.h"
+#include "powerup.h"
+#include "text.h"
 
-typedef enum {
+enum game_state {
 	game_active,
 	game_menu,
 	game_win
-} game_state_enum;
+};
 
-typedef struct {
-	game_state_enum state;
+#define max_powerups 4
+#define max_levels 4
+
+struct game {
+	enum game_state state;
 	i32 running;
-	input_t input;
+	struct input input;
 	i32 width, height;
 	const char *bindir;
-	sprite_renderer_t renderer;
-	level_t level;
-	object_t player;
-	ball_t ball;
-} game_t;
+	struct sprite_renderer renderer;
+	struct level levels[max_levels];
+	i32 level;
+	struct object player;
+	u32 lives;
+	struct ball ball;
+	struct particle_generator generator;
+	struct post_processor post_processor;
+	f32 time;
+	f32 shake_time;
+	struct powerup powerups[max_powerups];
+	struct text_renderer text_renderer;
+};
 
-extern game_t init_game(i32 width, i32 height);
-extern void process_input(game_t *game);
-extern void update_game(game_t *game, f32 dt);
-extern void render_game(game_t game);
+struct game init_game(i32 width, i32 height);
+void process_input(struct game *game);
+void update_game(struct game *game, f32 dt);
+void render_game(struct game game);
 
 #endif
diff --git a/in_practice/breakout/game.o b/in_practice/breakout/game.o
deleted file mode 100644
index 9c81917..0000000
Binary files a/in_practice/breakout/game.o and /dev/null differ
diff --git a/in_practice/breakout/input.c b/in_practice/breakout/input.c
index 1a4b76e..43f54bc 100644
--- a/in_practice/breakout/input.c
+++ b/in_practice/breakout/input.c
@@ -1,30 +1,33 @@
 #include "input.h"
 
-input_t init_input(void)
+struct input init_input(void)
 {
-	input_t input = {0};
+	struct input input = {0};
 	return input;
 }
 
-void update_input(input_t *input)
+void update_input(struct input *input)
 {
 	input->escape.last = input->escape.current;
 	input->right.last = input->right.current;
 	input->left.last = input->left.current;
+	input->up.last = input->up.current;
+	input->down.last = input->down.current;
 	input->space.last = input->space.current;
+	input->start.last = input->start.current;
 }
 
-i32 key_first_press(key_state_t key)
+i32 key_first_press(struct key key)
 {
 	return (key.current && !key.last);
 }
 
-i32 key_is_pressed(key_state_t key)
+i32 key_is_pressed(struct key key)
 {
 	return key.current;
 }
 
-i32 key_was_pressed(key_state_t key)
+i32 key_was_pressed(struct key key)
 {
 	return (key.last && !key.current);
 }
diff --git a/in_practice/breakout/input.h b/in_practice/breakout/input.h
index d5b9306..58b69f4 100644
--- a/in_practice/breakout/input.h
+++ b/in_practice/breakout/input.h
@@ -3,22 +3,25 @@
 
 #include "types.h"
 
-typedef struct {
+struct key {
 	i32 last;
 	i32 current;
-} key_state_t;
+};
 
-typedef struct {
-	key_state_t escape;
-	key_state_t right;
-	key_state_t left;
-	key_state_t space;
-} input_t;
+struct input {
+	struct key escape;
+	struct key right;
+	struct key left;
+	struct key up;
+	struct key down;
+	struct key space;
+	struct key start;
+};
 
-extern input_t init_input(void);
-extern void update_input(input_t *input);
-extern i32 key_first_press(key_state_t key);
-extern i32 key_is_pressed(key_state_t key);
-extern i32 key_was_pressed(key_state_t key);
+struct input init_input(void);
+void update_input(struct input *input);
+i32 key_first_press(struct key key);
+i32 key_is_pressed(struct key key);
+i32 key_was_pressed(struct key key);
 
 #endif
diff --git a/in_practice/breakout/input.o b/in_practice/breakout/input.o
deleted file mode 100644
index eda5524..0000000
Binary files a/in_practice/breakout/input.o and /dev/null differ
diff --git a/in_practice/breakout/level.c b/in_practice/breakout/level.c
index 6134959..619c05f 100644
--- a/in_practice/breakout/level.c
+++ b/in_practice/breakout/level.c
@@ -5,12 +5,12 @@
 #include <ctype.h>
 #include <stdio.h>
 
-level_t load_level(const char *dir, const char *filename, i32 width, i32 height)
+struct level load_level(const char *dir, const char *filename, i32 width, i32 height)
 {
 	assert(filename);
 	assert(width);
 	assert(height);
-	level_t level = {0};
+	struct level level = {0};
 	char path[512] = {0};
 	snprintf(path, 512, "%s/%s", (dir ? dir : "."), filename);
 	u8 *data = (u8 *)read_entire_file(path);
@@ -53,10 +53,10 @@ level_t load_level(const char *dir, const char *filename, i32 width, i32 height)
 	return level;
 }
 
-level_t init_level(u8 *tiles, i32 rows, i32 cols, i32 width, i32 height)
+struct level init_level(u8 *tiles, i32 rows, i32 cols, i32 width, i32 height)
 {
 	assert(tiles);
-	level_t level = {0};
+	struct level level = {0};
 	level.rows = rows;
 	level.cols = cols;
 	f32 tile_width = width / cols;
@@ -65,14 +65,14 @@ level_t init_level(u8 *tiles, i32 rows, i32 cols, i32 width, i32 height)
 	for (i32 i = 0; i < rows * cols; i++)
 		if (tiles[i])
 			level.count++;
-	level.tiles = malloc(sizeof(object_t) * level.count);
+	level.tiles = malloc(sizeof(struct object) * level.count);
 	i32 i = 0;
 	for (i32 row = 0; row < rows; row++) {
 		for (i32 col = 0; col < cols; col++) {
 			u8 *tile = tiles + col + row * cols;
 			if (!*tile)
 				continue;
-			object_t obj = {0};
+			struct object obj = {0};
 			obj.pos = (v2){tile_width * col, tile_height * row};
 			obj.size = size;
 			obj.texture = get_texture_id("solid");
@@ -104,7 +104,7 @@ level_t init_level(u8 *tiles, i32 rows, i32 cols, i32 width, i32 height)
 	return level;
 }
 
-void clear_level(level_t *level)
+void clear_level(struct level *level)
 {
 	free(level->tiles);
 	level->tiles = 0;
@@ -112,14 +112,14 @@ void clear_level(level_t *level)
 	level->cols = 0;
 }
 
-void render_level(sprite_renderer_t renderer, level_t level)
+void render_level(struct sprite_renderer renderer, struct level level)
 {
 	for (i32 i = 0; i < level.count; i++)
 		if (!level.tiles[i].destroyed)
 			render_object(renderer, level.tiles[i]);
 }
 
-i32 level_is_completed(level_t level)
+i32 level_is_complete(struct level level)
 {
 	for (i32 i = 0; i < level.count; i++)
 		if (!level.tiles[i].solid && !level.tiles[i].destroyed)
diff --git a/in_practice/breakout/level.h b/in_practice/breakout/level.h
index 91e3b85..97b2b35 100644
--- a/in_practice/breakout/level.h
+++ b/in_practice/breakout/level.h
@@ -3,16 +3,17 @@
 
 #include "object.h"
 
-typedef struct {
-	object_t *tiles;
+struct level {
+	struct object *tiles;
 	i32 count;
 	i32 rows;
 	i32 cols;
-} level_t;
+};
 
-extern level_t load_level(const char *dir, const char *filename, i32 width, i32 height);
-extern level_t init_level(u8 *tiles, i32 rows, i32 cols, i32 width, i32 height);
-extern void render_level(sprite_renderer_t renderer, level_t level);
-extern i32 level_is_completed(level_t level);
+struct level load_level(const char *dir, const char *filename, i32 width, i32 height);
+struct level init_level(u8 *tiles, i32 rows, i32 cols, i32 width, i32 height);
+void clear_level(struct level *level);
+void render_level(struct sprite_renderer renderer, struct level level);
+i32 level_is_complete(struct level level);
 
 #endif
diff --git a/in_practice/breakout/levels/first.txt b/in_practice/breakout/levels/first.txt
new file mode 100644
index 0000000..f762ca4
--- /dev/null
+++ b/in_practice/breakout/levels/first.txt
@@ -0,0 +1,8 @@
+2 2 0 2 2 2 2 2 2 2 2 2 2 2 2 2 2 0 2 2
+0 0 0 3 2 2 2 2 2 2 2 2 2 2 2 2 3 0 0 0
+3 2 3 4 2 3 3 3 2 2 2 2 3 3 3 2 4 3 2 3
+4 3 2 2 1 1 2 2 1 1 1 1 2 2 1 1 2 2 3 4
+0 0 2 2 2 2 3 3 3 2 2 3 3 3 2 2 2 0 0 0
+0 4 2 2 0 0 2 0 0 0 0 0 0 2 0 0 2 2 4 0
+0 4 2 2 2 0 0 0 0 0 0 0 0 0 0 2 2 2 4 0
+0 0 2 2 2 2 0 0 0 0 0 0 0 0 2 2 2 2 0 0
diff --git a/in_practice/breakout/levels/second.txt b/in_practice/breakout/levels/second.txt
new file mode 100644
index 0000000..e41d1a3
--- /dev/null
+++ b/in_practice/breakout/levels/second.txt
@@ -0,0 +1,8 @@
+0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0
+0 0 0 0 2 2 2 2 2 2 2 2 2 2 2 2 0 0 0 0
+0 1 3 4 4 4 3 3 4 1 1 4 3 3 4 4 4 3 1 0
+0 1 2 4 4 4 2 2 4 4 4 4 2 2 4 4 4 2 1 0
+0 0 2 2 2 2 3 3 3 2 2 3 3 3 2 2 2 0 3 0
+0 4 2 2 0 0 2 0 0 0 0 0 0 2 0 0 2 3 0 0
+0 4 2 2 2 0 0 0 0 0 0 0 0 0 0 2 2 0 0 0
+0 0 0 0 0 0 0 0 3 3 3 3 0 0 0 0 0 0 0 0
diff --git a/in_practice/breakout/levels/third.txt b/in_practice/breakout/levels/third.txt
new file mode 100644
index 0000000..cb53cca
--- /dev/null
+++ b/in_practice/breakout/levels/third.txt
@@ -0,0 +1,3 @@
+0 0 0 0 0
+0 0 2 0 0
+0 0 0 0 0
diff --git a/in_practice/breakout/linux.c b/in_practice/breakout/linux.c
index 2150ed9..8b7f28a 100644
--- a/in_practice/breakout/linux.c
+++ b/in_practice/breakout/linux.c
@@ -1,26 +1,34 @@
 #include "game.h"
 #include "sys.h"
+#include "audio.h"
 
 #include <SDL3/SDL.h>
 #include <GL/glew.h>
 
-#define DEBUG 1
+#include <stdio.h>
 
-typedef struct {
+#define DEBUG 0
+
+struct sdl_context {
 	SDL_Window *window;
 	i32 width;
 	i32 height;
 	SDL_Renderer *renderer;
+	SDL_AudioDeviceID audio_device;
+	SDL_AudioStream *streams[max_sounds];
+	i32 last_sound;
 	u64 last_counter;
 	f32 dt;
-} sdl_context_t;
+};
+
+static struct sdl_context ctx;
 
-static sdl_context_t init_sdl(i32 width, i32 height, i32 debug)
+static struct sdl_context init_sdl(i32 width, i32 height, i32 debug)
 {
-	sdl_context_t ctx = {0};
+	struct sdl_context ctx = {0};
 	ctx.width = width;
 	ctx.height = height;
-	SDL_Init(SDL_INIT_VIDEO);
+	SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO);
 	u64 flags = SDL_WINDOW_OPENGL;
 	SDL_CreateWindowAndRenderer("breakout", ctx.width, ctx.height, flags, &ctx.window, &ctx.renderer);
 	if (debug)
@@ -30,10 +38,13 @@ static sdl_context_t init_sdl(i32 width, i32 height, i32 debug)
 	SDL_GL_SetSwapInterval(0);
 	ctx.last_counter = SDL_GetPerformanceCounter();
 	glewInit();
+	ctx.audio_device = SDL_OpenAudioDevice(SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK, 0);
+	if (!ctx.audio_device)
+		die("failed to open audio device");
 	return ctx;
 }
 
-static void process_sdl_key(input_t *input, i32 scancode, i32 pressed)
+static void process_sdl_key(struct input *input, i32 scancode, i32 pressed)
 {
 	switch (scancode) {
 	case SDL_SCANCODE_ESCAPE:
@@ -45,15 +56,24 @@ static void process_sdl_key(input_t *input, i32 scancode, i32 pressed)
 	case SDL_SCANCODE_LEFT:
 		input->left.current = pressed;
 		break;
+	case SDL_SCANCODE_UP:
+		input->up.current = pressed;
+		break;
+	case SDL_SCANCODE_DOWN:
+		input->down.current = pressed;
+		break;
 	case SDL_SCANCODE_SPACE:
 		input->space.current = pressed;
 		break;
+	case SDL_SCANCODE_RETURN:
+		input->start.current = pressed;
+		break;
 	default:
 		break;
 	}
 }
 
-static void process_sdl_events(game_t *game)
+static void process_sdl_events(struct game *game)
 {
 	SDL_Event event;
 	while (SDL_PollEvent(&event)) {
@@ -74,11 +94,11 @@ static f32 get_elapsed(u64 last_counter)
 	return (f32)(current_counter - last_counter) / (f32)frequency;
 }
 
-static void lock_framerate_sdl(sdl_context_t *ctx, i32 fps)
+static void lock_framerate_sdl(struct sdl_context *ctx, i32 fps)
 {
 	f32 elapsed = get_elapsed(ctx->last_counter) * 1000.0f;
 	f32 target = 1000.0f / (f32)fps;
-	f32 sleep = target - elapsed;
+	f32 sleep = target - elapsed - 1.0f;
 	if (sleep > 0)
 		SDL_Delay((u32)sleep);
 	do {
@@ -88,6 +108,7 @@ static void lock_framerate_sdl(sdl_context_t *ctx, i32 fps)
 	ctx->last_counter = SDL_GetPerformanceCounter();
 }
 
+#if DEBUG
 static void fps_info(f32 dt, i32 again)
 {
 	static f32 time = 0;
@@ -112,18 +133,66 @@ static void fps_info(f32 dt, i32 again)
 		}
 	}
 }
+#endif
+
+void load_wav(const char *dir, const char *filename, const char *name)
+{
+	char path[512] = {0};
+	snprintf(path, 512, "%s/%s", (dir ? dir : "."), filename);
+	SDL_AudioSpec spec;
+	u8 *data;
+	u32 size;
+	if (!SDL_LoadWAV(path, &spec, &data, &size))
+		die("failed to load wav \"%s\"", path);
+	if (ctx.last_sound >= max_sounds) {
+		info("max sounds reached");
+		return;
+	}
+	sounds[ctx.last_sound] = (struct sound){data, size, name};
+	if (!(ctx.streams[ctx.last_sound] = SDL_CreateAudioStream(&spec, 0)))
+		die("failed to create audio stream");
+	if (!SDL_BindAudioStream(ctx.audio_device, ctx.streams[ctx.last_sound]))
+		die("failed to bind audio stream");
+	ctx.last_sound++;
+	info("sound \"%s\" loaded successfuly", path);
+}
+
+void play_audio(const char *name, i32 loop)
+{
+	i32 i = get_sound(name);
+	if (i == -1)
+		info("no audio with the name \"%s\"", name);
+	sounds[i].loop = loop;
+	if (SDL_GetAudioStreamQueued(ctx.streams[i]))
+		SDL_ClearAudioStream(ctx.streams[i]);
+	SDL_PutAudioStreamData(ctx.streams[i], sounds[i].data, sounds[i].size);
+}
+
+static void update_audio(void)
+{
+	for (i32 i = 0; i < max_sounds; i++) {
+		if (sounds[i].loop) {
+			i32 queued = SDL_GetAudioStreamQueued(ctx.streams[i]);
+		       	if (queued < (i32)sounds[i].size)
+				SDL_PutAudioStreamData(ctx.streams[i], sounds[i].data, sounds[i].size);
+		}
+	}
+}
 
 i32 main(void)
 {
-	sdl_context_t ctx = init_sdl(1600, 800, DEBUG);
-	game_t game = init_game(ctx.width, ctx.height);
+	ctx = init_sdl(800, 600, DEBUG);
+	struct game game = init_game(ctx.width, ctx.height);
 	while (game.running) {
 		process_sdl_events(&game);
 		process_input(&game);
 		update_game(&game, ctx.dt);
+		update_audio();
 		update_input(&game.input);
 		lock_framerate_sdl(&ctx, 60);
+#if DEBUG
 		fps_info(ctx.dt, 10);
+#endif
 		render_game(game);
 		SDL_GL_SwapWindow(ctx.window);
 	}
diff --git a/in_practice/breakout/linux.o b/in_practice/breakout/linux.o
deleted file mode 100644
index 732d25b..0000000
Binary files a/in_practice/breakout/linux.o and /dev/null differ
diff --git a/in_practice/breakout/my_math.c b/in_practice/breakout/my_math.c
index 5d69b92..ac5606b 100644
--- a/in_practice/breakout/my_math.c
+++ b/in_practice/breakout/my_math.c
@@ -1,6 +1,16 @@
 #include "my_math.h"
 #include <math.h>
 
+v2 v2a(f32 x)
+{
+	return (v2){x, x};
+}
+
+v3 v3a(f32 x)
+{
+	return (v3){x, x, x};
+}
+
 v2 scale_v2(v2 v, f32 x)
 {
 	return (v2){v.x * x, v.y * x};
@@ -11,14 +21,57 @@ v2 add_v2(v2 a, v2 b)
 	return (v2){a.x + b.x, a.y + b.y};
 }
 
-v2 v2a(f32 x)
+v2 addf_v2(v2 a, f32 b)
 {
-	return (v2){x, x};
+	return (v2){a.x + b, a.y + b};
 }
 
-v3 v3a(f32 x)
+v2 sub_v2(v2 a, v2 b)
 {
-	return (v3){x, x, x};
+	return (v2){a.x - b.x, a.y - b.y};
+}
+
+v2 clamp_v2(v2 v, v2 min, v2 max)
+{
+	f32 x = v.x < min.x ? min.x : v.x > max.x ? max.x : v.x;
+	f32 y = v.y < min.y ? min.y : v.y > max.y ? max.y : v.y;
+	return (v2){x, y};
+}
+
+f32 length_v2(v2 v)
+{
+	return sqrtf(v.x * v.x + v.y * v.y);
+}
+
+f32 dot_v2(v2 a, v2 b)
+{
+	return a.x * b.x + a.y * b.y;
+}
+
+v2 norm_v2(v2 a)
+{
+	f32 len = length_v2(a);
+	return (v2){a.x / len, a.y / len};
+}
+
+direction_enum direction_v2(v2 v)
+{
+	v2 directions[] = {
+		{1.0f, 0.0f},
+		{0.0f, 1.0f},
+		{-1.0f, 0.0f},
+		{0.0f, -1.0f}
+	};
+	f32 max = 0.0f;
+	i32 best = 0;
+	for (i32 i = 0; i < 4; i++) {
+		f32 dot = dot_v2(v, directions[i]);
+		if (dot > max) {
+			max = dot;
+			best = i;
+		}
+	}
+	return best;
 }
 
 mat mul_mat(mat l, mat r)
diff --git a/in_practice/breakout/my_math.h b/in_practice/breakout/my_math.h
index 29efb45..4c69e23 100644
--- a/in_practice/breakout/my_math.h
+++ b/in_practice/breakout/my_math.h
@@ -8,6 +8,8 @@ typedef struct {f32 x, y, z;} v3;
 typedef struct {f32 x, y, z, w;} v4;
 typedef struct {v4 c0, c1, c2, c3;} mat;
 
+typedef enum {direction_right, direction_up, direction_left, direction_down} direction_enum;
+
 #define mat_identity { \
 	{1.0f, 0.0f, 0.0f, 0.0f}, \
 	{0.0f, 1.0f, 0.0f, 0.0f}, \
@@ -18,10 +20,17 @@ typedef struct {v4 c0, c1, c2, c3;} mat;
 #define deg2rad(a) (a) * f32pi / 180.0f
 #define rad2deg(a) (a) * 180.0f / f32pi
 
-extern v2 scale_v2(v2 v, f32 x);
-extern v2 add_v2(v2 a, v2 b);
 extern v2 v2a(f32 x);
 extern v3 v3a(f32 x);
+extern v2 scale_v2(v2 v, f32 x);
+extern v2 add_v2(v2 a, v2 b);
+extern v2 addf_v2(v2 a, f32 b);
+extern v2 sub_v2(v2 a, v2 b);
+extern v2 clamp_v2(v2 v, v2 min, v2 max);
+extern f32 length_v2(v2 v);
+extern f32 dot_v2(v2 a, v2 b);
+extern v2 norm_v2(v2 a);
+extern direction_enum direction_v2(v2 v);
 extern mat mul_mat(mat l, mat r);
 extern mat make_scale_mat(v3 v);
 extern mat make_rotate_mat(v3 x, v3 y, v3 z);
diff --git a/in_practice/breakout/my_math.o b/in_practice/breakout/my_math.o
deleted file mode 100644
index 5516ac5..0000000
Binary files a/in_practice/breakout/my_math.o and /dev/null differ
diff --git a/in_practice/breakout/object.c b/in_practice/breakout/object.c
index 8fafb6e..3cfc2f7 100644
--- a/in_practice/breakout/object.c
+++ b/in_practice/breakout/object.c
@@ -1,13 +1,13 @@
 #include "object.h"
 
-void render_object(sprite_renderer_t renderer, object_t obj)
+void render_object(struct sprite_renderer renderer, struct object obj)
 {
 	render_sprite(renderer, obj.texture, obj.pos, obj.size, obj.rotation, obj.color);
 }
 
-i32 check_collision(object_t a, object_t b)
+i32 check_collision(struct object a, struct object b)
 {
-	i32 collision_x = (a.pos.x + a.size.x >= b.pos.x) && (b.pos.x + b.size.x >= a.pos.x); 
-	i32 collision_y = (a.pos.y + a.size.y >= b.pos.y) && (b.pos.y + b.size.y >= a.pos.y); 
-	return collision_x && collision_y;
+	i32 x = (a.pos.x + a.size.x >= b.pos.x) && (b.pos.x + b.size.x >= a.pos.x); 
+	i32 y = (a.pos.y + a.size.y >= b.pos.y) && (b.pos.y + b.size.y >= a.pos.y); 
+	return x && y;
 }
diff --git a/in_practice/breakout/object.h b/in_practice/breakout/object.h
index e1cfedb..8311d9e 100644
--- a/in_practice/breakout/object.h
+++ b/in_practice/breakout/object.h
@@ -4,7 +4,7 @@
 #include "my_math.h"
 #include "sprite.h"
 
-typedef struct {
+struct object {
 	v2 pos;
 	v2 vel;
 	v2 size;
@@ -13,7 +13,7 @@ typedef struct {
 	i32 solid;
 	i32 destroyed;
 	u32 texture;
-} object_t;
+};
 
 #define default_object { \
 	.pos = {0.0f, 0.0f}, \
@@ -26,7 +26,7 @@ typedef struct {
 	.texture = 0 \
 }
 
-extern void render_object(sprite_renderer_t renderer, object_t obj);
-extern i32 check_collision(object_t a, object_t b);
+void render_object(struct sprite_renderer renderer, struct object obj);
+i32 check_collision(struct object a, struct object b);
 
 #endif
diff --git a/in_practice/breakout/object.o b/in_practice/breakout/object.o
deleted file mode 100644
index ea2ad29..0000000
Binary files a/in_practice/breakout/object.o and /dev/null differ
diff --git a/in_practice/breakout/particle.c b/in_practice/breakout/particle.c
new file mode 100644
index 0000000..8c71520
--- /dev/null
+++ b/in_practice/breakout/particle.c
@@ -0,0 +1,104 @@
+#include "particle.h"
+#include "types.h"
+#include "shader.h"
+
+#include <stdlib.h>
+#include <float.h>
+
+void respawn_particle(struct particle *particle, struct object object, v2 offset)
+{
+	f32 random = ((rand() % 100) - 50) / 10.0f;
+	particle->pos = addf_v2(add_v2(object.pos, offset), random);
+	particle->vel = scale_v2(object.vel, 0.1f);
+	random = 0.5f + ((rand() % 100) / 100.0f);
+	particle->color = (v4){random, random, random, 1.0f};
+	particle->life = 1.0f;
+}
+
+i32 find_unused_particle(struct particle_generator generator)
+{
+	f32 min = FLT_MAX;
+	i32 mini = 0;
+	for (i32 i = 0; i < MAX_PARTICLES; i++) {
+		f32 life = generator.particles[i].life;
+		if (life <= 0.0f) {
+			return i;
+		} else if (life < min) {
+			min = life;
+			mini = i;
+		}
+	}
+	return mini;
+}
+
+struct particle_generator init_generator(i32 new, u32 shader, u32 texture)
+{
+	struct particle_generator generator = {0};
+	reset_particles(&generator);
+	generator.new = new;
+	generator.shader = shader;
+	generator.texture = texture;
+	f32 vertices[] = {
+		0.0f, 0.0f, 0.0f, 0.0f,
+		1.0f, 0.0f, 1.0f, 0.0f,
+		0.0f, 1.0f, 0.0f, 1.0f,
+
+		1.0f, 0.0f, 1.0f, 0.0f,
+		1.0f, 1.0f, 1.0f, 1.0f,
+		0.0f, 1.0f, 0.0f, 1.0f
+	};
+	u32 vao, vbo;
+	glGenVertexArrays(1, &vao);
+	glGenBuffers(1, &vbo);
+	glBindBuffer(GL_ARRAY_BUFFER, vbo);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+	glBindVertexArray(vao);
+	glEnableVertexAttribArray(0);
+	glVertexAttribPointer(0, 4, GL_FLOAT, 0, 4 * sizeof(f32), 0);
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+	glBindVertexArray(0);
+	generator.vao = vao;
+	return generator;
+}
+
+void update_particles(struct particle_generator *generator, struct object object, f32 dt, v2 offset)
+{
+	for (i32 i = 0; i < generator->new; i++) {
+		i32 unused = find_unused_particle(*generator);
+		respawn_particle(generator->particles + unused, object, offset);
+	}
+	for (i32 i = 0; i < MAX_PARTICLES; i++) {
+		struct particle *particle = generator->particles + i;
+		particle->life -= dt;
+		if (particle->life > 0.0f) {
+			particle->pos = sub_v2(particle->pos, scale_v2(particle->vel, dt));
+			particle->color.w -= dt * 2.0f;
+		}
+	}
+}
+
+void render_particles(struct particle_generator generator)
+{
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE);
+	glUseProgram(generator.shader);
+	glActiveTexture(GL_TEXTURE0);
+	glBindTexture(GL_TEXTURE_2D, generator.texture);
+	glBindVertexArray(generator.vao);
+	for (i32 i = 0; i < MAX_PARTICLES; i++) {
+		struct particle *particle = generator.particles + i;
+		if (particle->life > 0.0f) {
+			uniform_v2(generator.shader, "offset", particle->pos);
+			uniform_v4(generator.shader, "color", particle->color);
+			glDrawArrays(GL_TRIANGLES, 0, 6);
+		}
+	}
+	glBindVertexArray(0);
+	glUseProgram(0);
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+}
+	
+void reset_particles(struct particle_generator *generator)
+{
+	for (i32 i = 0; i < MAX_PARTICLES; i++)
+		generator->particles[i] = (struct particle)default_particle;
+}
diff --git a/in_practice/breakout/particle.h b/in_practice/breakout/particle.h
new file mode 100644
index 0000000..3e5d9a6
--- /dev/null
+++ b/in_practice/breakout/particle.h
@@ -0,0 +1,38 @@
+#ifndef PARTICLE_H
+#define PARTICLE_H
+
+#include "my_math.h"
+#include "object.h"
+
+struct particle {
+	v2 pos;
+	v2 vel;
+	v4 color;
+	f32 life;
+};
+
+#define default_particle { \
+	.pos = {0.0f, 0.0f}, \
+	.vel = {0.0f, 0.0f}, \
+	.color = {1.0f, 1.0f, 1.0f, 1.0f}, \
+	.life = 0.0f \
+}
+
+#define MAX_PARTICLES 500
+
+struct particle_generator {
+	struct particle particles[MAX_PARTICLES];
+	i32 new;
+	u32 shader;
+	u32 texture;
+	u32 vao;
+};
+
+void respawn_particle(struct particle *particle, struct object object, v2 offset);
+i32 find_unused_particle(struct particle_generator generator);
+struct particle_generator init_generator(i32 new, u32 shader, u32 texture);
+void update_particles(struct particle_generator *generator, struct object object, f32 dt, v2 offset);
+void render_particles(struct particle_generator generator);
+void reset_particles(struct particle_generator *generator);
+
+#endif
diff --git a/in_practice/breakout/post_processor.c b/in_practice/breakout/post_processor.c
new file mode 100644
index 0000000..70691c2
--- /dev/null
+++ b/in_practice/breakout/post_processor.c
@@ -0,0 +1,109 @@
+#include "post_processor.h"
+#include "sys.h"
+#include "shader.h"
+#include "texture.h"
+
+#include <GL/glew.h>
+
+struct post_processor init_post_processor(i32 width, i32 height, u32 shader)
+{
+	struct post_processor processor = {0};
+	processor.width = width;
+	processor.height = height;
+	glGenFramebuffers(1, &processor.msfbo);
+	glGenFramebuffers(1, &processor.fbo);
+	glGenRenderbuffers(1, &processor.rbo);
+	glBindFramebuffer(GL_FRAMEBUFFER, processor.msfbo);
+	glBindRenderbuffer(GL_RENDERBUFFER, processor.rbo);
+	glRenderbufferStorageMultisample(GL_RENDERBUFFER, 4, GL_RGB, width, height);
+	glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, processor.rbo);
+	if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
+		die("failed to create msfbo");
+	glBindRenderbuffer(GL_RENDERBUFFER, 0);
+	glBindFramebuffer(GL_FRAMEBUFFER, processor.fbo);
+	gl_texture_t texture = (gl_texture_t)default_texture;
+	generate_texture(&texture, width, height, 0);
+	processor.texture = texture.id;
+	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, processor.texture, 0);
+	if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
+		die("failed to create fbo");
+	glBindFramebuffer(GL_FRAMEBUFFER, 0);
+	u32 vbo;
+	f32 vertices[] = {
+		-1.0f, -1.0f, 0.0f, 0.0f,
+		1.0f,  1.0f, 1.0f, 1.0f,
+		-1.0f,  1.0f, 0.0f, 1.0f,
+		-1.0f, -1.0f, 0.0f, 0.0f,
+		1.0f, -1.0f, 1.0f, 0.0f,
+		1.0f,  1.0f, 1.0f, 1.0f
+	};
+	glGenBuffers(1, &vbo);
+	glBindBuffer(GL_ARRAY_BUFFER, vbo);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+	glGenVertexArrays(1, &processor.vao);
+	glBindVertexArray(processor.vao);
+	glEnableVertexAttribArray(0);
+	glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 4 * sizeof(f32), 0);
+	glBindVertexArray(0);
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+	processor.shader = shader;
+	glUseProgram(processor.shader);
+	uniform_i32(processor.shader, "colorbuffer", 0);
+	f32 offset = 1.0f / 300.0f;
+	f32 offsets[] = {
+		-offset, offset, /* top-left */
+		0.0f, offset, /* top-center */
+		offset, offset, /* top-right */
+		-offset, 0.0f, /* center-left */
+		0.0f, 0.0f, /* center */
+		offset, 0.0f, /* center-right */
+		-offset, -offset, /* bottom-left */
+		0.0f, -offset, /* bottom-center */
+		offset, -offset /* bottom-right */
+	};
+	glUniform2fv(glGetUniformLocation(processor.shader, "offsets"), 9, offsets);
+	i32 edge_kernel[] = {
+		-1, -1, -1,
+		-1,  8, -1,
+		-1, -1, -1
+	};
+	glUniform1iv(glGetUniformLocation(processor.shader, "edge_kernel"), 9, edge_kernel);
+	f32 blur_kernel[] = {
+		1.0f / 16.0f, 2.0f / 16.0f, 1.0f / 16.0f,
+		2.0f / 16.0f, 4.0f / 16.0f, 2.0f / 16.0f,
+		1.0f / 16.0f, 2.0f / 16.0f, 1.0f / 16.0f
+	};
+	glUniform1fv(glGetUniformLocation(processor.shader, "blur_kernel"), 9, blur_kernel);
+	glUseProgram(0);
+	return processor;
+}
+
+void begin_render(struct post_processor processor)
+{
+	glBindFramebuffer(GL_FRAMEBUFFER, processor.msfbo);
+	glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
+	glClear(GL_COLOR_BUFFER_BIT);
+}
+
+void end_render(struct post_processor processor)
+{
+	glBindFramebuffer(GL_READ_FRAMEBUFFER, processor.msfbo);
+	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, processor.fbo);
+	glBlitFramebuffer(0, 0, processor.width, processor.height, 0, 0, processor.width, processor.height, GL_COLOR_BUFFER_BIT, GL_NEAREST);
+	glBindFramebuffer(GL_FRAMEBUFFER, 0);
+}
+
+void render_post(struct post_processor processor, f32 time)
+{
+	glUseProgram(processor.shader);
+	uniform_f32(processor.shader, "time", time);
+	uniform_i32(processor.shader, "confuse", processor.confuse);
+	uniform_i32(processor.shader, "chaos", processor.chaos);
+	uniform_i32(processor.shader, "shake", processor.shake);
+	glActiveTexture(GL_TEXTURE0);
+	glBindTexture(GL_TEXTURE_2D, processor.texture);
+	glBindVertexArray(processor.vao);
+	glDrawArrays(GL_TRIANGLES, 0, 6);
+	glBindVertexArray(0);
+	glUseProgram(0);
+}
diff --git a/in_practice/breakout/post_processor.h b/in_practice/breakout/post_processor.h
new file mode 100644
index 0000000..5056aee
--- /dev/null
+++ b/in_practice/breakout/post_processor.h
@@ -0,0 +1,25 @@
+#ifndef POST_PROCESSOR_H
+#define POST_PROCESSOR_H
+
+#include "types.h"
+
+struct post_processor {
+	i32 width, height;
+	u32 msfbo;
+	u32 fbo;
+	u32 rbo;
+	u32 texture;
+	u32 vao;
+	i32 confuse, chaos, shake;
+	u32 shader;
+};
+
+struct post_processor init_post_processor(i32 width, i32 height, u32 shader);
+void begin_render(struct post_processor processor);
+void end_render(struct post_processor processor);
+void render_post(struct post_processor processor, f32 time);
+
+#endif
+
+      
+
diff --git a/in_practice/breakout/powerup.c b/in_practice/breakout/powerup.c
new file mode 100644
index 0000000..ab09b9f
--- /dev/null
+++ b/in_practice/breakout/powerup.c
@@ -0,0 +1,31 @@
+#include "powerup.h"
+
+v2 default_powerup_size = {60.0f, 20.0};
+
+struct powerup spawn_powerup(v2 pos, v3 color, enum powerup_type type, f32 duration, u32 texture)
+{
+	struct powerup powerup = {0};
+	powerup.pos = pos;
+	powerup.vel = (v2){0.0f, 150.0f};
+	powerup.size = default_powerup_size;
+	powerup.color = color;
+	powerup.type = type;
+	powerup.duration = duration;
+	powerup.texture = texture;
+	return powerup;
+}
+
+i32 check_powerup_collision(struct powerup powerup, struct object obj)
+{
+	
+	i32 x = (powerup.pos.x + powerup.size.x >= obj.pos.x) &&
+		(obj.pos.x + obj.size.x >= powerup.pos.x); 
+	i32 y = (powerup.pos.y + powerup.size.y >= obj.pos.y) &&
+		(obj.pos.y + obj.size.y >= powerup.pos.y); 
+	return x && y;
+}
+
+void render_powerup(struct sprite_renderer renderer, struct powerup powerup)
+{
+	render_sprite(renderer, powerup.texture, powerup.pos, powerup.size, 0.0f, powerup.color);
+}
diff --git a/in_practice/breakout/powerup.h b/in_practice/breakout/powerup.h
new file mode 100644
index 0000000..b80ea74
--- /dev/null
+++ b/in_practice/breakout/powerup.h
@@ -0,0 +1,36 @@
+#ifndef POWERUP_H
+#define POWERUP_H
+
+#include "types.h"
+#include "my_math.h"
+#include "object.h"
+
+enum powerup_type {
+	powerup_none,
+	powerup_speed,
+	powerup_sticky,
+	powerup_pass,
+	powerup_increase,
+	powerup_confuse,
+	powerup_chaos
+};
+
+struct powerup {
+	v2 pos;
+	v2 vel;
+	v2 size;
+	v3 color;
+	enum powerup_type type;
+	f32 duration;
+	i32 active;
+	i32 destroyed;
+	u32 texture;
+};
+
+extern v2 default_powerup_size;
+
+struct powerup spawn_powerup(v2 pos, v3 color, enum powerup_type type, f32 duration, u32 texture);
+i32 check_powerup_collision(struct powerup powerup, struct object obj);
+void render_powerup(struct sprite_renderer renderer, struct powerup powerup);
+
+#endif
diff --git a/in_practice/breakout/shader.c b/in_practice/breakout/shader.c
index 2fff3c4..fa1ff2c 100644
--- a/in_practice/breakout/shader.c
+++ b/in_practice/breakout/shader.c
@@ -88,12 +88,31 @@ void uniform_f32(u32 id, const char *name, f32 v)
 	glUniform1f(loc, v);
 }
 
+void uniform_i32(u32 id, const char *name, i32 v)
+{
+	u32 loc = glGetUniformLocation(id, name);
+	glUniform1i(loc, v);
+}
+
+
+void uniform_v2(u32 id, const char *name, v2 v)
+{
+	u32 loc = glGetUniformLocation(id, name);
+	glUniform2fv(loc, 1, (const f32 *)&v);
+}
+
 void uniform_v3(u32 id, const char *name, v3 v)
 {
 	u32 loc = glGetUniformLocation(id, name);
 	glUniform3fv(loc, 1, (const f32 *)&v);
 }
 
+void uniform_v4(u32 id, const char *name, v4 v)
+{
+	u32 loc = glGetUniformLocation(id, name);
+	glUniform4fv(loc, 1, (const f32 *)&v);
+}
+
 void uniform_mat(u32 id, const char *name, mat m)
 {
 	u32 loc = glGetUniformLocation(id, name);
diff --git a/in_practice/breakout/shader.h b/in_practice/breakout/shader.h
index 19c3044..922539d 100644
--- a/in_practice/breakout/shader.h
+++ b/in_practice/breakout/shader.h
@@ -14,7 +14,10 @@ extern shader_t shaders[MAX_SHADERS];
 extern u32 load_shader(const char *dir, const char *vertex_filename, const char *fragment_filename, const char *geometry_filename, const char *name);
 extern u32 get_shader(const char *name);
 extern void uniform_f32(u32 id, const char *name, f32 v);
+extern void uniform_i32(u32 id, const char *name, i32 v);
+extern void uniform_v2(u32 id, const char *name, v2 v);
 extern void uniform_v3(u32 id, const char *name, v3 v);
+extern void uniform_v4(u32 id, const char *name, v4 v);
 extern void uniform_mat(u32 id, const char *name, mat m);
 
 #endif
diff --git a/in_practice/breakout/shader.o b/in_practice/breakout/shader.o
deleted file mode 100644
index b96b63c..0000000
Binary files a/in_practice/breakout/shader.o and /dev/null differ
diff --git a/in_practice/breakout/shaders/particle.frag b/in_practice/breakout/shaders/particle.frag
new file mode 100644
index 0000000..ef62554
--- /dev/null
+++ b/in_practice/breakout/shaders/particle.frag
@@ -0,0 +1,15 @@
+#version 330 core
+
+in vert_t {
+	vec2 tex_coords;
+	vec4 color;
+} vert;
+
+out vec4 frag_color;
+
+uniform sampler2D sprite;
+
+void main()
+{
+	frag_color = texture(sprite, vert.tex_coords) * vert.color;
+}
diff --git a/in_practice/breakout/shaders/particle.vert b/in_practice/breakout/shaders/particle.vert
new file mode 100644
index 0000000..9827a95
--- /dev/null
+++ b/in_practice/breakout/shaders/particle.vert
@@ -0,0 +1,20 @@
+#version 330 core
+
+layout (location = 0) in vec4 vertex;
+
+out vert_t {
+	vec2 tex_coords;
+	vec4 color;
+} vert;
+
+uniform mat4 projection;
+uniform vec2 offset; 
+uniform vec4 color;
+
+void main()
+{
+	float scale = 10.0;
+	vert.tex_coords = vertex.zw;
+	vert.color = color;
+	gl_Position = projection * vec4((vertex.xy * scale) + offset, 0.0, 1.0);
+}
diff --git a/in_practice/breakout/shaders/post.frag b/in_practice/breakout/shaders/post.frag
new file mode 100644
index 0000000..899b098
--- /dev/null
+++ b/in_practice/breakout/shaders/post.frag
@@ -0,0 +1,38 @@
+#version 330 core
+
+in vert_t {
+	vec2 tex_coords;
+} vert;
+
+out vec4 frag_color;
+
+uniform sampler2D colorbuffer;
+uniform vec2 offsets[9];
+uniform int edge_kernel[9];
+uniform float blur_kernel[9];
+
+uniform bool chaos;
+uniform bool confuse;
+uniform bool shake;
+
+void main()
+{
+	frag_color = vec4(0.0);
+	vec3 sample[9];
+	if (chaos || shake)
+		for (int i = 0; i < 9; i++)
+			sample[i] = vec3(texture(colorbuffer, vert.tex_coords + offsets[i]));
+	if (chaos) {
+		for (int i = 0; i < 9; i++)
+			frag_color += vec4(sample[i] * edge_kernel[i], 0.0);
+		frag_color.a = 1.0;
+	} else if (confuse) {
+		frag_color = vec4(1.0 - texture(colorbuffer, vert.tex_coords).rgb, 1.0);
+	} else if (shake) {
+		for (int i = 0; i < 9; i++)
+			frag_color += vec4(sample[i] * blur_kernel[i], 0.0);
+		frag_color.a = 1.0;
+	} else {
+		frag_color = texture(colorbuffer, vert.tex_coords);
+	}
+}
diff --git a/in_practice/breakout/shaders/post.vert b/in_practice/breakout/shaders/post.vert
new file mode 100644
index 0000000..7a8ac4f
--- /dev/null
+++ b/in_practice/breakout/shaders/post.vert
@@ -0,0 +1,33 @@
+#version 330 core
+
+layout (location = 0) in vec4 vertex;
+
+out vert_t {
+	vec2 tex_coords;
+} vert;
+
+uniform bool chaos;
+uniform bool confuse;
+uniform bool shake;
+uniform float time;
+
+void main()
+{
+	gl_Position = vec4(vertex.xy, 0.0, 1.0);
+	vec2 texture = vertex.zw;
+	if (chaos) {
+		float strength = 0.3;
+		vec2 pos = vec2(texture.x + sin(time) * strength,
+			texture.y + cos(time) * strength);
+		vert.tex_coords = pos;
+	} else if (confuse) {
+		vert.tex_coords = vec2(1.0) - texture;
+	} else {
+		vert.tex_coords = texture;
+	}
+	if (shake) {
+		float strength = 0.01;
+		gl_Position.x += cos(time * 10) * strength;
+		gl_Position.y += cos(time * 15) * strength;
+	}
+}
diff --git a/in_practice/breakout/shaders/text.frag b/in_practice/breakout/shaders/text.frag
new file mode 100644
index 0000000..a6fae4b
--- /dev/null
+++ b/in_practice/breakout/shaders/text.frag
@@ -0,0 +1,16 @@
+#version 330 core
+
+in vert_t {
+	vec2 tex_coords;
+} vert;
+
+out vec4 frag_color;
+
+uniform sampler2D glyph;
+uniform vec3 text_color;
+
+void main()
+{
+	vec4 glyph_color = vec4(1.0, 1.0, 1.0, texture(glyph, vert.tex_coords).r);
+	frag_color = vec4(text_color, 1.0) * glyph_color;
+}
diff --git a/in_practice/breakout/shaders/text.vert b/in_practice/breakout/shaders/text.vert
new file mode 100644
index 0000000..aa22caa
--- /dev/null
+++ b/in_practice/breakout/shaders/text.vert
@@ -0,0 +1,15 @@
+#version 330 core
+
+layout(location = 0) in vec4 vertex;
+
+out vert_t {
+	vec2 tex_coords;
+} vert;
+
+uniform mat4 projection;
+
+void main()
+{
+	gl_Position = projection * vec4(vertex.xy, 0.0, 1.0);
+	vert.tex_coords = vertex.zw;
+}
diff --git a/in_practice/breakout/sprite.c b/in_practice/breakout/sprite.c
index 07a357f..a455bd2 100644
--- a/in_practice/breakout/sprite.c
+++ b/in_practice/breakout/sprite.c
@@ -1,9 +1,9 @@
 #include "sprite.h"
 #include "shader.h"
 
-sprite_renderer_t init_renderer(u32 shader)
+struct sprite_renderer init_renderer(u32 shader)
 {
-	sprite_renderer_t renderer = {0};
+	struct sprite_renderer renderer = {0};
 	renderer.shader = shader;
 	f32 vertices[] = {
 		0.0f, 0.0f, 0.0f, 0.0f,
@@ -28,7 +28,7 @@ sprite_renderer_t init_renderer(u32 shader)
 	return renderer;
 }
 
-void render_sprite(sprite_renderer_t renderer, u32 texture, v2 pos, v2 size, f32 rotate, v3 color)
+void render_sprite(struct sprite_renderer renderer, u32 texture, v2 pos, v2 size, f32 rotate, v3 color)
 {
 	glUseProgram(renderer.shader);
 	mat model = mat_identity;
diff --git a/in_practice/breakout/sprite.h b/in_practice/breakout/sprite.h
index 7c07eb9..dc60b0c 100644
--- a/in_practice/breakout/sprite.h
+++ b/in_practice/breakout/sprite.h
@@ -4,12 +4,12 @@
 #include "texture.h"
 #include "my_math.h"
 
-typedef struct {
+struct sprite_renderer {
 	u32 shader;
 	u32 vao;
-} sprite_renderer_t;
+};
 
-extern sprite_renderer_t init_renderer(u32 shader);
-extern void render_sprite(sprite_renderer_t renderer, u32 texture, v2 pos, v2 size, f32 rotate, v3 color);
+struct sprite_renderer init_renderer(u32 shader);
+void render_sprite(struct sprite_renderer renderer, u32 texture, v2 pos, v2 size, f32 rotate, v3 color);
 
 #endif
diff --git a/in_practice/breakout/sprite.o b/in_practice/breakout/sprite.o
deleted file mode 100644
index 0a9116f..0000000
Binary files a/in_practice/breakout/sprite.o and /dev/null differ
diff --git a/in_practice/breakout/sys.h b/in_practice/breakout/sys.h
index ca7aaec..ce7b6c4 100644
--- a/in_practice/breakout/sys.h
+++ b/in_practice/breakout/sys.h
@@ -1,9 +1,13 @@
 #ifndef SYS_H
 #define SYS_H
 
-extern void info(const char *fmt, ...);
-extern void die(const char *fmt, ...);
-extern void *read_entire_file(const char *filename);
-extern const char *get_bin_dir(void);
+#include "types.h"
+
+void info(const char *fmt, ...);
+void die(const char *fmt, ...);
+void *read_entire_file(const char *filename);
+const char *get_bin_dir(void);
+void load_wav(const char *dir, const char *filename, const char *name);
+void play_audio(const char *name, i32 loop);
 
 #endif
diff --git a/in_practice/breakout/sys.o b/in_practice/breakout/sys.o
deleted file mode 100644
index 1a7be71..0000000
Binary files a/in_practice/breakout/sys.o and /dev/null differ
diff --git a/in_practice/breakout/text.c b/in_practice/breakout/text.c
new file mode 100644
index 0000000..994ffb3
--- /dev/null
+++ b/in_practice/breakout/text.c
@@ -0,0 +1,127 @@
+#include "text.h"
+#include "shader.h"
+#include "sys.h"
+#include <GL/glew.h>
+#include <ft2build.h>
+#include FT_FREETYPE_H
+
+struct text_renderer init_text_renderer(i32 width, i32 height)
+{
+	struct text_renderer renderer = {0};
+	renderer.shader = get_shader("text");
+	glUseProgram(renderer.shader);
+	mat projection = ortho(0.0f, width, height, 0.0f, -1.0f, 1.0f);
+	uniform_mat(renderer.shader, "projection", projection);
+	uniform_i32(renderer.shader, "glyph", 0);
+	glUseProgram(0);
+	glGenVertexArrays(1, &renderer.vao);
+	glGenBuffers(1, &renderer.vbo);
+	glBindVertexArray(renderer.vao);
+	glBindBuffer(GL_ARRAY_BUFFER, renderer.vbo);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(f32) * 6 * 4, 0, GL_DYNAMIC_DRAW);
+	glEnableVertexAttribArray(0);
+	glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 4 * sizeof(f32), 0);
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+	glBindVertexArray(0);
+	return renderer;
+}
+
+void load_font(struct text_renderer *renderer, const char *dir, const char *filename, u32 size)
+{
+	for (i32 i = 0; i < 128; i++) {
+		struct text_char *c = renderer->chars + i;
+		c->texture = 0;
+		c->size = (v2){0.0f, 0.0f};
+		c->bearing = (v2){0.0f, 0.0f};
+		c->advance = 0;
+	}
+	FT_Library ft;
+	if (FT_Init_FreeType(&ft))
+		die("failed to initialize freetype library");
+	FT_Face face;
+	char path[512] = {0};
+	snprintf(path, 512, "%s/%s", (dir ? dir : "."), filename);
+	if (FT_New_Face(ft, path, 0, &face))
+		die("failed to load \"%s\"", path);
+	FT_Set_Pixel_Sizes(face, 0, size);
+	glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+	for (u8 c = 0; c < 128; c++) {
+		if (FT_Load_Char(face, c, FT_LOAD_RENDER))
+			die("failed to load char \"%c\"", c);
+		u32 texture;
+		glGenTextures(1, &texture);
+		glBindTexture(GL_TEXTURE_2D, texture);
+		glTexImage2D(GL_TEXTURE_2D, 0, GL_RED,
+			     face->glyph->bitmap.width,
+			     face->glyph->bitmap.rows,
+			     0, GL_RED, GL_UNSIGNED_BYTE,
+			     face->glyph->bitmap.buffer);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+		renderer->chars[c] = (struct text_char){
+			texture,
+		       	{face->glyph->bitmap.width, face->glyph->bitmap.rows},
+		       	{face->glyph->bitmap_left, face->glyph->bitmap_top},
+		       	face->glyph->advance.x
+		};
+		glBindTexture(GL_TEXTURE_2D, 0);
+	}
+	FT_Done_Face(face);
+	FT_Done_FreeType(ft);
+	info("font \"%s\" loaded successfully", path);
+}
+
+v2 get_text_size(struct text_renderer renderer, const char *text, f32 scale)
+{
+	v2 size = {0};
+	for (const char *c = text; *c; c++) {
+		struct text_char ch = renderer.chars[(u8)*c];
+		f32 h = ch.size.y * scale;
+		if (h > size.y)
+			size.y = h;
+		size.x += (ch.advance >> 6) * scale;
+	}
+	return size;
+}
+
+void render_text(struct text_renderer renderer, const char *text, v2 pos, f32 scale, v3 color)
+{
+	glUseProgram(renderer.shader);
+	uniform_v3(renderer.shader, "text_color", color);
+	glActiveTexture(GL_TEXTURE0);
+	glBindVertexArray(renderer.vao);
+	for (const char *c = text; *c; c++) {
+		struct text_char ch = renderer.chars[(u8)*c];
+		f32 x = pos.x + ch.bearing.x * scale;
+		f32 y = pos.y + (renderer.chars['H'].bearing.y - ch.bearing.y) * scale;
+		f32 w = ch.size.x * scale;
+		f32 h = ch.size.y * scale;
+		f32 vertices[] = {
+			x,     y + h, 0.0f, 1.0f,
+			x + w, y,     1.0f, 0.0f,
+			x,     y,     0.0f, 0.0f,
+
+			x,     y + h, 0.0f, 1.0f,
+			x + w, y + h, 1.0f, 1.0f,
+			x + w, y,     1.0f, 0.0f,
+		};
+		glBindTexture(GL_TEXTURE_2D, ch.texture);
+		glBindBuffer(GL_ARRAY_BUFFER, renderer.vbo);
+		glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertices), vertices);
+		glBindBuffer(GL_ARRAY_BUFFER, 0);
+		glDrawArrays(GL_TRIANGLES, 0, 6);
+		glBindTexture(GL_TEXTURE_2D, 0);
+		pos.x += (ch.advance >> 6) * scale;
+	}
+	glBindVertexArray(0);
+	glUseProgram(0);
+}
+
+void render_text_centered(struct text_renderer renderer, const char *text, v2 pos, f32 scale, v3 color)
+{
+	v2 size = get_text_size(renderer, text, scale);
+	v2 top_left = sub_v2(pos, scale_v2(size, 0.5f));
+	render_text(renderer, text, top_left, scale, color);
+}
diff --git a/in_practice/breakout/text.h b/in_practice/breakout/text.h
new file mode 100644
index 0000000..1056498
--- /dev/null
+++ b/in_practice/breakout/text.h
@@ -0,0 +1,27 @@
+#ifndef TEXT_H
+#define TEXT_H
+
+#include "types.h"
+#include "my_math.h"
+
+struct text_char {
+	u32 texture;
+	v2 size;
+	v2 bearing;
+	u32 advance;
+};
+
+struct text_renderer {
+	struct text_char chars[128];
+	u32 shader;
+	u32 vao;
+	u32 vbo;
+};
+
+struct text_renderer init_text_renderer(i32 width, i32 height);
+void load_font(struct text_renderer *renderer, const char *dir, const char *filename, u32 size);
+v2 get_text_size(struct text_renderer renderer, const char *text, f32 scale);
+void render_text(struct text_renderer renderer, const char *text, v2 pos, f32 scale, v3 color);
+void render_text_centered(struct text_renderer renderer, const char *text, v2 pos, f32 scale, v3 color);
+
+#endif
diff --git a/in_practice/breakout/texture.c b/in_practice/breakout/texture.c
index ac672f3..c44cc4b 100644
--- a/in_practice/breakout/texture.c
+++ b/in_practice/breakout/texture.c
@@ -27,7 +27,7 @@ gl_texture_t load_texture(const char *dir, const char *filename, const char *nam
 		info("texture with name \"%s\" already exist", name);
 		return texture;
 	}
-	texture = (gl_texture_t)DEFAULT_TEXTURE;
+	texture = (gl_texture_t)default_texture;
 	texture.name = name;
 	if (alpha) {
 		texture.internal_format = GL_RGBA;
diff --git a/in_practice/breakout/texture.h b/in_practice/breakout/texture.h
index 2e9d867..388a100 100644
--- a/in_practice/breakout/texture.h
+++ b/in_practice/breakout/texture.h
@@ -17,9 +17,9 @@ typedef struct {
 	u32 mag_filter;
 } gl_texture_t;
 
-#define DEFAULT_TEXTURE {0, 0, 0, 0, GL_RGB, GL_RGB, GL_REPEAT, GL_REPEAT, GL_NEAREST, GL_NEAREST}
+#define default_texture {0, 0, 0, 0, GL_RGB, GL_RGB, GL_REPEAT, GL_REPEAT, GL_NEAREST, GL_NEAREST}
 
-#define MAX_TEXTURES 8
+#define MAX_TEXTURES 16
 extern gl_texture_t textures[MAX_TEXTURES];
 
 extern void generate_texture(gl_texture_t *texture, u32 width, u32 height, void *data);
diff --git a/in_practice/breakout/texture.o b/in_practice/breakout/texture.o
deleted file mode 100644
index 6973e36..0000000
Binary files a/in_practice/breakout/texture.o and /dev/null differ
diff --git a/in_practice/breakout/textures/particle.png b/in_practice/breakout/textures/particle.png
new file mode 100644
index 0000000..bc0f6ba
Binary files /dev/null and b/in_practice/breakout/textures/particle.png differ
diff --git a/in_practice/breakout/textures/powerup_chaos.png b/in_practice/breakout/textures/powerup_chaos.png
new file mode 100644
index 0000000..ef63643
Binary files /dev/null and b/in_practice/breakout/textures/powerup_chaos.png differ
diff --git a/in_practice/breakout/textures/powerup_confuse.png b/in_practice/breakout/textures/powerup_confuse.png
new file mode 100644
index 0000000..3a35153
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