#include "GL/glew.h"
#include "GLFW/glfw3.h"
#include "pwyazh.h"
#include "common.h"
#include <unistd.h>
#define WIDTH 1024
#define HEIGHT 768
static V3F camera_pos;
static F32 dt;
static Input input;
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;
}
}
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, "depth testing", 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);
}