quite a lot of changes that I, of course, are not going to describe;)

1 files changed, 324 insertions, 411 deletions

diff --git a/advanced_opengl/5.framebuffers/framebuffers.c b/advanced_opengl/5.framebuffers/framebuffers.c
index a0523cc..7948a61 100644
--- a/advanced_opengl/5.framebuffers/framebuffers.c
+++ b/advanced_opengl/5.framebuffers/framebuffers.c
@@ -2,423 +2,336 @@
 #include "GLFW/glfw3.h"
 
 #include "pwyazh.h"
-
 #include "pwyazh_GL.h"
 
 #include "common.h"
 
-#include <unistd.h>
+int main(void)
+{
+	GLFWwindow *window;
+	State state;
+	S32 width, height;
+	Input input;
 
-#define WIDTH 1024
-#define HEIGHT 768
+	if (glfwInit() == GLFW_FALSE) {
+		fprintf(stderr, "[ERROR] Failed to initialize glfw.\n");
+		return(1);
+	}
 
-static V3F camera_pos;
-static F32 dt;
-static Input input;
+	width = 1024;
+	height = 768;
 
-void
-key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
-{
-    switch (action)
-    {
-        case GLFW_PRESS: {
-            switch (key)
-            {
-                case GLFW_KEY_D: {
-                    input.move_right.state = KeyState_PRESS;
-                } break;
-                case GLFW_KEY_W: {
-                    input.move_forward.state = KeyState_PRESS;
-                } break;
-                case GLFW_KEY_A: {
-                    input.move_left.state = KeyState_PRESS;
-                } break;
-                case GLFW_KEY_S: {
-                    input.move_backward.state = KeyState_PRESS;
-                } break;
-                case GLFW_KEY_E: {
-                    input.move_up.state = KeyState_PRESS;
-                } break;
-                case GLFW_KEY_Q: {
-                    input.move_down.state = KeyState_PRESS;
-                } break;
-            }
-        } break;
-        
-        case GLFW_RELEASE: {
-            switch (key)
-            {
-                case GLFW_KEY_D: {
-                    input.move_right.state = KeyState_RELEASE;
-                } break;
-                case GLFW_KEY_W: {
-                    input.move_forward.state = KeyState_RELEASE;
-                } break;
-                case GLFW_KEY_A: {
-                    input.move_left.state = KeyState_RELEASE;
-                } break;
-                case GLFW_KEY_S: {
-                    input.move_backward.state = KeyState_RELEASE;
-                } break;
-                case GLFW_KEY_E: {
-                    input.move_up.state = KeyState_RELEASE;
-                } break;
-                case GLFW_KEY_Q: {
-                    input.move_down.state = KeyState_RELEASE;
-                } break;
-            }
-        } break;
-    }
-}
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+	window = glfwCreateWindow(width, height, "Framebuffers", 0, 0);
+	if (!window) {
+		fprintf(stderr, "[ERROR] Failed to create window.\n");
+		glfwTerminate();
+		return(1);
+	}
 
-int
-main(void)
-{
-    GLFWwindow *window;
-    
-    if (glfwInit() == GLFW_FALSE)
-    {
-        fprintf(stderr, "[ERROR] Failed to initialize glfw.\n");
-        return(1);
-    }
-    
-    glfwWindowHint(GLFW_RESIZABLE, 0);
-    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
-    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
-    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
-    window = glfwCreateWindow(WIDTH, HEIGHT, "Framebuffers", 0, 0);
-    if (!window)
-    {
-        fprintf(stderr, "[ERROR] Failed to create window.\n");
-        glfwTerminate();
-        return(1);
-    }
-    
-    glfwMakeContextCurrent(window);
-    
-    glfwSetKeyCallback(window, key_callback);
-    
-    if (glewInit() != GLEW_OK)
-    {
-        fprintf(stderr, "[ERROR] Failed to initialize glew.\n");
-        glfwTerminate();
-        return(1);
-    }
-    
-    U32 screen_shader = create_shader_program("shaders/screen.vs", "shaders/screen.fs");
-    U32 cube_shader = create_shader_program("shaders/cube.vs", "shaders/cube.fs");
-    U32 marble_texture = load_texture("../../data/textures/marble.jpg");
-    U32 metal_texture = load_texture("../../data/textures/metal.png");
-    U32 window_texture = load_texture("../../data/textures/window.png");
-    
-    U32 fbo;
-    glGenFramebuffers(1, &fbo);
-    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
-    
-    U32 texture_colorbuffer;
-    glGenTextures(1, &texture_colorbuffer);
-    glBindTexture(GL_TEXTURE_2D, texture_colorbuffer);
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, WIDTH, HEIGHT, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-    glBindTexture(GL_TEXTURE_2D, 0);
-    
-    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
-                           texture_colorbuffer, 0);
-    
-    U32 rbo;
-    glGenRenderbuffers(1, &rbo);
-    glBindRenderbuffer(GL_RENDERBUFFER, rbo);
-    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, WIDTH, HEIGHT);
-    glBindRenderbuffer(GL_RENDERBUFFER, 0);
-    
-    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
-                              GL_RENDERBUFFER, rbo);
-    if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
-        fprintf(stderr, "[ERROR]: Framebuffer is not complete.\n");
-    glBindFramebuffer(GL_FRAMEBUFFER, 0);
-    
-    F32 a = 0.5f;
-    F32 vertices[] = {
-        -a, -a, -a,  0.0f, 0.0f,
-        a, -a, -a,  1.0f, 0.0f,
-        a,  a, -a,  1.0f, 1.0f,
-        a,  a, -a,  1.0f, 1.0f,
-        -a,  a, -a,  0.0f, 1.0f,
-        -a, -a, -a,  0.0f, 0.0f,
-        
-        -a, -a,  a,  0.0f, 0.0f,
-        a, -a,  a,  1.0f, 0.0f,
-        a,  a,  a,  1.0f, 1.0f,
-        a,  a,  a,  1.0f, 1.0f,
-        -a,  a,  a,  0.0f, 1.0f,
-        -a, -a,  a,  0.0f, 0.0f,
-        
-        -a,  a,  a,  1.0f, 0.0f,
-        -a,  a, -a,  1.0f, 1.0f,
-        -a, -a, -a,  0.0f, 1.0f,
-        -a, -a, -a,  0.0f, 1.0f,
-        -a, -a,  a,  0.0f, 0.0f,
-        -a,  a,  a,  1.0f, 0.0f,
-        
-        a,  a,  a,  1.0f, 0.0f,
-        a,  a, -a,  1.0f, 1.0f,
-        a, -a, -a,  0.0f, 1.0f,
-        a, -a, -a,  0.0f, 1.0f,
-        a, -a,  a,  0.0f, 0.0f,
-        a,  a,  a,  1.0f, 0.0f,
-        
-        -a, -a, -a,  0.0f, 1.0f,
-        a, -a, -a,  1.0f, 1.0f,
-        a, -a,  a,  1.0f, 0.0f,
-        a, -a,  a,  1.0f, 0.0f,
-        -a, -a,  a,  0.0f, 0.0f,
-        -a, -a, -a,  0.0f, 1.0f,
-        
-        -a,  a, -a,  0.0f, 1.0f,
-        a,  a, -a,  1.0f, 1.0f,
-        a,  a,  a,  1.0f, 0.0f,
-        a,  a,  a,  1.0f, 0.0f,
-        -a,  a,  a,  0.0f, 0.0f,
-        -a,  a, -a,  0.0f, 1.0f
-    };
-    
-    Transform cube_positions[] = {
-        transform_default(),
-        transform_make_translate(v3f(a, 0.0f, -4.0f*a))
-    };
-    
-    Transform platform_position =
-        transform_make_scale_translate(v3f(10.0f, 0.2f, 10.0f),
-                                       v3f(0.0f, -(a+(a*0.2f)+0.01f), 0.0f));
-    
-    U32 cube_vao, quad_vao, vbo;
-    
-    glGenVertexArrays(1, &cube_vao);
-    glBindVertexArray(cube_vao);
-    
-    glGenBuffers(1, &vbo);
-    glBindBuffer(GL_ARRAY_BUFFER, vbo);
-    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
-    
-    glEnableVertexAttribArray(0);
-    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5*sizeof(F32), (void *)0);
-    glEnableVertexAttribArray(1);
-    glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5*sizeof(F32), (void *)(3*sizeof(F32)));
-    glBindVertexArray(0);
-    
-    F32 quad_vertices[] = {
-        -1.0f, -1.0f, 0.0f,  0.0f, 0.0f,
-        1.0f, -1.0f, 0.0f,  1.0f, 0.0f,
-        1.0f,  1.0f, 0.0f,  1.0f, 1.0f,
-        -1.0f, -1.0f, 0.0f,  0.0f, 0.0f,
-        1.0f,  1.0f, 0.0f,  1.0f, 1.0f,
-        -1.0f,  1.0f, 0.0f,  0.0f, 1.0f
-    };
-    
-    glGenVertexArrays(1, &quad_vao);
-    glBindVertexArray(quad_vao);
-    glGenBuffers(1, &vbo);
-    glBindBuffer(GL_ARRAY_BUFFER, vbo);
-    glBufferData(GL_ARRAY_BUFFER, sizeof(quad_vertices), quad_vertices, GL_STATIC_DRAW);
-    glEnableVertexAttribArray(0);
-    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5*sizeof(F32), (void *)0);
-    glEnableVertexAttribArray(1);
-    glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5*sizeof(F32), (void *)(3*sizeof(F32)));
-    glBindVertexArray(0);
-    
-    Transform window_transforms[] = {
-        transform_make_scale_translate(v3f(0.5f, 0.5f, 0.5f), v3f(0.0f, 0.0f, a+0.1f)),
-        transform_make_scale_translate(v3f(0.5f, 0.5f, 0.5f), v3f(0.0f, 0.0f, 2.0f)),
-        transform_make_scale_translate(v3f(0.5f, 0.5f, 0.5f), v3f(1.0f, 0.0f, -1.0f)),
-        transform_make_scale_translate(v3f(0.5f, 0.5f, 0.5f), v3f(-2.0f, 0.0f, 0.5f)),
-        transform_make_scale_translate(v3f(0.5f, 0.5f, 0.5f), v3f(-3.0f, 0.0f, -3.0f)),
-        transform_make_scale_translate(v3f(0.5f, 0.5f, 0.5f), v3f(3.0f, 0.0f, 0.2)),
-    };
-    
-    F32 angle = 0.0f;
-    for (S32 window_index = 0;
-         window_index < (S32)ArrayCount(window_transforms);
-         ++window_index)
-    {
-        Transform *transform = window_transforms+window_index;
-        *transform = transform_rotate(*transform, v3f(0.0f, angle, 0.0f));
-        angle += 30.0f;
-    }
-    
-    F32 target_fps = 60.0f;
-    F32 target_spf = 1.0f/target_fps;
-    camera_pos = v3f(0.0f, 1.0f, 3.0f);
-    
-    F32 last_time = glfwGetTime();
-    
-    while (!glfwWindowShouldClose(window))
-    {
-        glfwPollEvents();
-        
-        /* INFO(pryazha): update */
-        V3F left, up, forward;
-        V3F world_up = v3f(0.0f, 1.0f, 0.0f);
-        
-        forward = v3f_norm(v3f_sub(v3f(0.0f, 0.0f, 0.0f), camera_pos));
-        left = v3f_norm(v3f_cross(world_up, forward));
-        up = v3f_cross(forward, left);
-        
-        V3F dp = v3f_zero();
-        F32 speed = 2.0f;
-        if (key_is_pressed(input.move_right))
-            dp = v3f_add(dp, v3f_scalef(left, -speed*dt));
-        if (key_is_pressed(input.move_forward))
-            dp = v3f_add(dp, v3f_scalef(forward, speed*dt));
-        if (key_is_pressed(input.move_left))
-            dp = v3f_add(dp, v3f_scalef(left, speed*dt));
-        if (key_is_pressed(input.move_backward))
-            dp = v3f_add(dp, v3f_scalef(forward, -speed*dt));
-        if (key_is_pressed(input.move_up))
-            dp = v3f_add(dp, v3f_scalef(up, speed*dt));
-        if (key_is_pressed(input.move_down))
-            dp = v3f_add(dp, v3f_scalef(up, -speed*dt));
-        
-        input_update_last_state(&input);
-        
-        camera_pos = v3f_add(camera_pos, dp);
-        
-        Transform sorted_window_transforms[ArrayCount(window_transforms)];
-        MemoryCopyArray(sorted_window_transforms, window_transforms);
-        for (S32 i = 0; i < (S32)ArrayCount(sorted_window_transforms); ++i) {
-            for (S32 pos_index = 1;
-                 pos_index < (S32)ArrayCount(sorted_window_transforms);
-                 ++pos_index)
-            {
-                F32 distance_left = v3f_length(v3f_sub(sorted_window_transforms[pos_index-1].translate, camera_pos));
-                F32 distance_right = v3f_length(v3f_sub(sorted_window_transforms[pos_index].translate, camera_pos));
-                if (distance_left < distance_right) {
-                    Transform temp = sorted_window_transforms[pos_index];
-                    sorted_window_transforms[pos_index] = sorted_window_transforms[pos_index-1];
-                    sorted_window_transforms[pos_index-1] = temp;
-                }
-            }
-        }
-        
-        /* INFO(pryazha): Render */
-        glBindFramebuffer(GL_FRAMEBUFFER, fbo);
-        glClearColor(0.15f, 0.15f, 0.15f, 1.0f);
-        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-        glEnable(GL_DEPTH_TEST);
-        MAT4 view, projection;
-        view = look_at(camera_pos, v3f(0.0f, 0.0f, 0.0f), v3f(0.0f, 1.0f, 0.0f));
-        projection = perspective(90.0f, (F32)WIDTH/(F32)HEIGHT, 0.1f, 100.0f);
-        glUseProgram(cube_shader);
-        shader_set_mat4fv(cube_shader, "view", view);
-        shader_set_mat4fv(cube_shader, "projection", projection);
-        glBindTexture(GL_TEXTURE_2D, marble_texture);
-        glBindVertexArray(cube_vao);
-        for (S32 transform_index = 0;
-             transform_index < (S32)ArrayCount(cube_positions);
-             ++transform_index)
-        {
-            shader_set_mat4fv(cube_shader, "model", transform_apply(cube_positions[transform_index]));
-            glDrawArrays(GL_TRIANGLES, 0, 36);
-        }
-        
-        glBindTexture(GL_TEXTURE_2D, metal_texture);
-        shader_set_mat4fv(cube_shader, "model", transform_apply(platform_position));
-        glDrawArrays(GL_TRIANGLES, 0, 36);
-        glBindVertexArray(0);
-        
-        glEnable(GL_BLEND);
-        glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
-        glUseProgram(cube_shader);
-        glBindTexture(GL_TEXTURE_2D, window_texture);
-        shader_set_mat4fv(cube_shader, "view", view);
-        shader_set_mat4fv(cube_shader, "projection", projection);
-        glBindVertexArray(quad_vao);
-        for (S32 window_index = 0;
-             window_index < (S32)ArrayCount(sorted_window_transforms);
-             ++window_index)
-        {
-            shader_set_mat4fv(cube_shader, "model", transform_apply(sorted_window_transforms[window_index]));
-            glDrawArrays(GL_TRIANGLES, 0, 6);
-        }
-        glBindVertexArray(0);
-        glDisable(GL_BLEND);
-        
-        glBindFramebuffer(GL_FRAMEBUFFER, 0);
-        glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
-        glClear(GL_COLOR_BUFFER_BIT);
-        glUseProgram(screen_shader);
-        glDisable(GL_DEPTH_TEST);
-        glBindTexture(GL_TEXTURE_2D, texture_colorbuffer);
-        glBindVertexArray(quad_vao);
-        shader_set_mat4fv(screen_shader, "model", mat4_identity());
-        glDrawArrays(GL_TRIANGLES, 0, 6);
-        glBindVertexArray(0);
-        
-        glBindFramebuffer(GL_FRAMEBUFFER, fbo);
-        glClearColor(0.15f, 0.15f, 0.15f, 1.0f);
-        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-        glEnable(GL_DEPTH_TEST);
-        V3F target = v3f_add(camera_pos, v3f_negate(forward));
-        view = look_at(camera_pos, target, v3f(0.0f, 1.0f, 0.0f));
-        glUseProgram(cube_shader);
-        shader_set_mat4fv(cube_shader, "view", view);
-        shader_set_mat4fv(cube_shader, "projection", projection);
-        glBindTexture(GL_TEXTURE_2D, marble_texture);
-        glBindVertexArray(cube_vao);
-        for (S32 transform_index = 0;
-             transform_index < (S32)ArrayCount(cube_positions);
-             ++transform_index)
-        {
-            shader_set_mat4fv(cube_shader, "model", transform_apply(cube_positions[transform_index]));
-            glDrawArrays(GL_TRIANGLES, 0, 36);
-        }
-        
-        glBindTexture(GL_TEXTURE_2D, metal_texture);
-        shader_set_mat4fv(cube_shader, "model", transform_apply(platform_position));
-        glDrawArrays(GL_TRIANGLES, 0, 36);
-        glBindVertexArray(0);
-        
-        glEnable(GL_BLEND);
-        glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
-        glUseProgram(cube_shader);
-        glBindTexture(GL_TEXTURE_2D, window_texture);
-        shader_set_mat4fv(cube_shader, "view", view);
-        shader_set_mat4fv(cube_shader, "projection", projection);
-        glBindVertexArray(quad_vao);
-        for (S32 window_index = 0;
-             window_index < (S32)ArrayCount(sorted_window_transforms);
-             ++window_index)
-        {
-            shader_set_mat4fv(cube_shader, "model", transform_apply(sorted_window_transforms[window_index]));
-            glDrawArrays(GL_TRIANGLES, 0, 6);
-        }
-        glBindVertexArray(0);
-        glDisable(GL_BLEND);
-        
-        glBindFramebuffer(GL_FRAMEBUFFER, 0);
-        glUseProgram(screen_shader);
-        glDisable(GL_DEPTH_TEST);
-        glBindTexture(GL_TEXTURE_2D, texture_colorbuffer);
-        glBindVertexArray(quad_vao);
-        MAT4 model = transform_apply(transform_make_scale_translate(v3f(0.3f, 0.3f, 0.3f), v3f(-0.7f, 0.7f, 0.0f)));
-        shader_set_mat4fv(screen_shader, "model", model);
-        glDrawArrays(GL_TRIANGLES, 0, 6);
-        glBindVertexArray(0);
-        
-        glfwSwapBuffers(window);
-        
-        F32 elapsed = glfwGetTime()-last_time;
-        if (elapsed < target_spf)
-        {
-            U32 sleep_time = (U32)(target_spf-elapsed);
-            if (sleep_time > 0)
-                sleep(sleep_time);
-        }
-        F32 current_time = glfwGetTime();
-        dt = current_time-last_time;
-        last_time = current_time;
-    }
-    
-    glfwTerminate();
-    return(0);
+	glfwMakeContextCurrent(window);
+
+	if (glewInit() != GLEW_OK) {
+		fprintf(stderr, "[ERROR] Failed to initialize glew.\n");
+		glfwTerminate();
+		return(1);
+	}
+
+	U32 screen_shader = create_shader_program("shaders/screen.vert",
+						  "shaders/screen.frag");
+	U32 cube_shader = create_shader_program("shaders/cube.vert",
+					       	"shaders/cube.frag");
+	U32 marble_texture = load_texture("../../data/textures/marble.jpg");
+	U32 metal_texture = load_texture("../../data/textures/metal.png");
+	U32 window_texture = load_texture("../../data/textures/window.png");
+
+	U32 fbo, texture_colorbuffer, rbo;
+	glGenFramebuffers(1, &fbo);
+	glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+	glGenTextures(1, &texture_colorbuffer);
+	glBindTexture(GL_TEXTURE_2D, texture_colorbuffer);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+	glBindTexture(GL_TEXTURE_2D, 0);
+	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+			       GL_TEXTURE_2D, texture_colorbuffer, 0);
+	glGenRenderbuffers(1, &rbo);
+	glBindRenderbuffer(GL_RENDERBUFFER, rbo);
+	glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, width, height);
+	glBindRenderbuffer(GL_RENDERBUFFER, 0);
+	glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
+				  GL_RENDERBUFFER, rbo);
+	if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
+		fprintf(stderr, "[ERROR]: Framebuffer is not complete.\n");
+	glBindFramebuffer(GL_FRAMEBUFFER, 0);
+
+	F32 a = 0.5f;
+	F32 vertices[] = {
+		-a, -a, -a,  0.0f, 0.0f,
+		 a, -a, -a,  1.0f, 0.0f,
+		 a,  a, -a,  1.0f, 1.0f,
+		 a,  a, -a,  1.0f, 1.0f,
+		-a,  a, -a,  0.0f, 1.0f,
+		-a, -a, -a,  0.0f, 0.0f,
+
+		-a, -a,  a,  0.0f, 0.0f,
+		 a, -a,  a,  1.0f, 0.0f,
+		 a,  a,  a,  1.0f, 1.0f,
+		 a,  a,  a,  1.0f, 1.0f,
+		-a,  a,  a,  0.0f, 1.0f,
+		-a, -a,  a,  0.0f, 0.0f,
+
+		-a,  a,  a,  1.0f, 0.0f,
+		-a,  a, -a,  1.0f, 1.0f,
+		-a, -a, -a,  0.0f, 1.0f,
+		-a, -a, -a,  0.0f, 1.0f,
+		-a, -a,  a,  0.0f, 0.0f,
+		-a,  a,  a,  1.0f, 0.0f,
+
+		 a,  a,  a,  1.0f, 0.0f,
+		 a,  a, -a,  1.0f, 1.0f,
+		 a, -a, -a,  0.0f, 1.0f,
+		 a, -a, -a,  0.0f, 1.0f,
+		 a, -a,  a,  0.0f, 0.0f,
+		 a,  a,  a,  1.0f, 0.0f,
+
+		-a, -a, -a,  0.0f, 1.0f,
+		 a, -a, -a,  1.0f, 1.0f,
+		 a, -a,  a,  1.0f, 0.0f,
+		 a, -a,  a,  1.0f, 0.0f,
+		-a, -a,  a,  0.0f, 0.0f,
+		-a, -a, -a,  0.0f, 1.0f,
+
+		-a,  a, -a,  0.0f, 1.0f,
+		 a,  a, -a,  1.0f, 1.0f,
+		 a,  a,  a,  1.0f, 0.0f,
+		 a,  a,  a,  1.0f, 0.0f,
+		-a,  a,  a,  0.0f, 0.0f,
+		-a,  a, -a,  0.0f, 1.0f
+	};
+
+	Transform cube_positions[] = {
+		transform_default(),
+		transform_make_translate(v3f(a, 0.0f, -4.0f*a))
+	};
+
+	V3F platform_pos = v3f(10.0f, 0.2f, 10.0f);
+	V3F platform_scale = v3f(0.0f, -(a+(a*0.2f)+0.01f), 0.0f);
+	Transform platform_transform = transform_make_scale_translate(platform_pos,
+								      platform_scale);
+	U32 cube_vao, quad_vao, vbo;
+	glGenVertexArrays(1, &cube_vao);
+	glBindVertexArray(cube_vao);
+	glGenBuffers(1, &vbo);
+	glBindBuffer(GL_ARRAY_BUFFER, vbo);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+	glEnableVertexAttribArray(0);
+	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5*sizeof(F32), (void *)0);
+	glEnableVertexAttribArray(1);
+	glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5*sizeof(F32), (void *)(3*sizeof(F32)));
+	glBindVertexArray(0);
+
+	F32 quad_vertices[] = {
+		-1.0f, -1.0f, 0.0f,  0.0f, 0.0f,
+		 1.0f, -1.0f, 0.0f,  1.0f, 0.0f,
+		 1.0f,  1.0f, 0.0f,  1.0f, 1.0f,
+		-1.0f, -1.0f, 0.0f,  0.0f, 0.0f,
+		 1.0f,  1.0f, 0.0f,  1.0f, 1.0f,
+		-1.0f,  1.0f, 0.0f,  0.0f, 1.0f
+	};
+
+	glGenVertexArrays(1, &quad_vao);
+	glBindVertexArray(quad_vao);
+	glGenBuffers(1, &vbo);
+	glBindBuffer(GL_ARRAY_BUFFER, vbo);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(quad_vertices), quad_vertices, GL_STATIC_DRAW);
+	glEnableVertexAttribArray(0);
+	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5*sizeof(F32), (void *)0);
+	glEnableVertexAttribArray(1);
+	glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5*sizeof(F32), (void *)(3*sizeof(F32)));
+	glBindVertexArray(0);
+
+	Transform window_transforms[] = {
+		transform_make_scale_translate(v3f(0.5f, 0.5f, 0.5f), v3f(0.0f, 0.0f, a+0.1f)),
+		transform_make_scale_translate(v3f(0.5f, 0.5f, 0.5f), v3f(0.0f, 0.0f, 2.0f)),
+		transform_make_scale_translate(v3f(0.5f, 0.5f, 0.5f), v3f(1.0f, 0.0f, -1.0f)),
+		transform_make_scale_translate(v3f(0.5f, 0.5f, 0.5f), v3f(-2.0f, 0.0f, 0.5f)),
+		transform_make_scale_translate(v3f(0.5f, 0.5f, 0.5f), v3f(-3.0f, 0.0f, -3.0f)),
+		transform_make_scale_translate(v3f(0.5f, 0.5f, 0.5f), v3f(3.0f, 0.0f, 0.2)),
+	};
+
+	F32 angle = 0.0f;
+	for (S32 i = 0; i < (S32)ArrayCount(window_transforms); ++i) {
+		Transform *transform = window_transforms+i;
+		*transform = transform_rotate(*transform, v3f(0.0f, angle, 0.0f));
+		angle += 30.0f;
+	}
+
+	state.camera = (Camera) {
+		v3f(0.0f, 0.0f, 3.0f),
+		90.0f, 0.1f, 100.0f,
+		0.0f, 0.0f
+	};
+
+	F32 target_fps = 60.0f;
+	F32 target_spf = 1.0f/target_fps;
+	F32 last_time = glfwGetTime();
+
+	while (!glfwWindowShouldClose(window)) {
+		glfwPollEvents();
+
+		process_glfw_keyboard(window, &input);
+		glfwGetFramebufferSize(window, &width, &height);
+
+		/* INFO(pryazha): Update */
+		V3F target = v3f_zero();
+
+		if (key_first_press(input.exit))
+			glfwSetWindowShouldClose(window, GLFW_TRUE);
+
+		V3F dv = get_dv_camera_orbital(&input, state.camera.pos,
+					       target, state.dt, 3.0f);
+		state.camera.pos = v3f_add(state.camera.pos, dv);
+
+		input_update_last_state(&input);
+
+		Transform sorted[ArrayCount(window_transforms)];
+		MemoryCopyArray(sorted, window_transforms);
+		for (S32 i = 0; i < (S32)ArrayCount(sorted); ++i) {
+			for (S32 j = 1; j < (S32)ArrayCount(sorted); ++j) {
+				F32 dist_left = v3f_length(v3f_sub(sorted[j-1].translate, state.camera.pos));
+				F32 dist_right = v3f_length(v3f_sub(sorted[j].translate, state.camera.pos));
+				if (dist_left < dist_right) {
+					Transform temp = sorted[j];
+					sorted[j] = sorted[j-1];
+					sorted[j-1] = temp;
+				}
+			}
+		}
+
+		/* INFO(pryazha): Render */
+		MAT4 model, view, proj;
+
+		view = look_at(state.camera.pos, target, v3f(0.0f, 1.0f, 0.0f));
+		proj = perspective(state.camera.fovx, (F32)width/(F32)height,
+				   state.camera.near, state.camera.far);
+
+		glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+		glViewport(0, 0, width, height);
+		glClearColor(0.15f, 0.15f, 0.15f, 1.0f);
+		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+		glEnable(GL_DEPTH_TEST);
+		glUseProgram(cube_shader);
+		shader_set_mat4fv(cube_shader, "view", view);
+		shader_set_mat4fv(cube_shader, "proj", proj);
+		glBindTexture(GL_TEXTURE_2D, marble_texture);
+		glBindVertexArray(cube_vao);
+		for (S32 i = 0; i < (S32)ArrayCount(cube_positions); ++i) {
+			model = transform_apply(cube_positions[i]);
+			shader_set_mat4fv(cube_shader, "model", model);
+			glDrawArrays(GL_TRIANGLES, 0, 36);
+		}
+
+		glBindTexture(GL_TEXTURE_2D, metal_texture);
+		model = transform_apply(platform_transform);
+		shader_set_mat4fv(cube_shader, "model", model);
+		glDrawArrays(GL_TRIANGLES, 0, 36);
+		glBindVertexArray(0);
+
+		glEnable(GL_BLEND);
+		glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
+		glUseProgram(cube_shader);
+		glBindTexture(GL_TEXTURE_2D, window_texture);
+		shader_set_mat4fv(cube_shader, "view", view);
+		shader_set_mat4fv(cube_shader, "proj", proj);
+		glBindVertexArray(quad_vao);
+		for (S32 i = 0; i < (S32)ArrayCount(sorted); ++i) {
+			model = transform_apply(sorted[i]);
+			shader_set_mat4fv(cube_shader, "model", model);
+			glDrawArrays(GL_TRIANGLES, 0, 6);
+		}
+		glBindVertexArray(0);
+		glDisable(GL_BLEND);
+
+		glBindFramebuffer(GL_FRAMEBUFFER, 0);
+		glViewport(0, 0, width, height);
+		glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
+		glClear(GL_COLOR_BUFFER_BIT);
+		glUseProgram(screen_shader);
+		glDisable(GL_DEPTH_TEST);
+		glBindTexture(GL_TEXTURE_2D, texture_colorbuffer);
+		glBindVertexArray(quad_vao);
+		shader_set_mat4fv(screen_shader, "model", mat4_identity());
+		glDrawArrays(GL_TRIANGLES, 0, 6);
+		glBindVertexArray(0);
+
+		glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+		glViewport(0, 0, width, height);
+		glClearColor(0.15f, 0.15f, 0.15f, 1.0f);
+		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+		glEnable(GL_DEPTH_TEST);
+		V3F f = v3f(view.m2.x, view.m2.y, view.m2.z);
+		target = v3f_add(state.camera.pos, v3f_negate(f));
+		view = look_at(state.camera.pos, target, v3f(0.0f, 1.0f, 0.0f));
+		glUseProgram(cube_shader);
+		shader_set_mat4fv(cube_shader, "view", view);
+		shader_set_mat4fv(cube_shader, "proj", proj);
+		glBindTexture(GL_TEXTURE_2D, marble_texture);
+		glBindVertexArray(cube_vao);
+		for (S32 i = 0; i < (S32)ArrayCount(cube_positions); ++i) {
+			model = transform_apply(cube_positions[i]);
+			shader_set_mat4fv(cube_shader, "model", model);
+			glDrawArrays(GL_TRIANGLES, 0, 36);
+		}
+
+		glBindTexture(GL_TEXTURE_2D, metal_texture);
+		model = transform_apply(platform_transform);
+		shader_set_mat4fv(cube_shader, "model", model);
+		glDrawArrays(GL_TRIANGLES, 0, 36);
+		glBindVertexArray(0);
+
+		glEnable(GL_BLEND);
+		glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
+		glUseProgram(cube_shader);
+		glBindTexture(GL_TEXTURE_2D, window_texture);
+		shader_set_mat4fv(cube_shader, "view", view);
+		shader_set_mat4fv(cube_shader, "proj", proj);
+		glBindVertexArray(quad_vao);
+		for (S32 i = 0; i < (S32)ArrayCount(sorted); ++i) {
+			model = transform_apply(sorted[i]);
+			shader_set_mat4fv(cube_shader, "model", model);
+			glDrawArrays(GL_TRIANGLES, 0, 6);
+		}
+		glBindVertexArray(0);
+		glDisable(GL_BLEND);
+
+		glBindFramebuffer(GL_FRAMEBUFFER, 0);
+		glViewport(0, 0, width, height);
+		glUseProgram(screen_shader);
+		glDisable(GL_DEPTH_TEST);
+		glBindTexture(GL_TEXTURE_2D, texture_colorbuffer);
+		glBindVertexArray(quad_vao);
+		model = transform_apply(transform_make_scale_translate(v3f(0.3f, 0.3f, 0.3f), v3f(-0.7f, 0.7f, 0.0f)));
+		shader_set_mat4fv(screen_shader, "model", model);
+		glDrawArrays(GL_TRIANGLES, 0, 6);
+		glBindVertexArray(0);
+
+		glfwSwapBuffers(window);
+
+		F32 elapsed = glfwGetTime()-last_time;
+		if (elapsed < target_spf) {
+			U32 sleep_time = (U32)(target_spf-elapsed);
+			if (sleep_time > 0)
+				sleep(sleep_time);
+		}
+		F32 current_time = glfwGetTime();
+		state.dt = current_time-last_time;
+		last_time = current_time;
+	}
+
+	glfwTerminate();
+	return(0);
 }