#include "GL/glew.h"
#include "GLFW/glfw3.h"
#include "pwyazh.h"
#include "pwyazh_GL.h"
#include "common.h"
#include <unistd.h>
#define WIDTH 1024
#define HEIGHT 768
static V3F camera_pos;
static F32 dt;
static Input input;
static B32 first_mouse = 1;
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;
}
}
void
cursor_pos_callback(GLFWwindow* window, double xpos, double ypos)
{
if (first_mouse)
{
input.last_mouse_pos = v2f(xpos, ypos);
first_mouse = 0;
}
input.mouse_offset = v2f(input.mouse_offset.x+((F32)xpos-input.last_mouse_pos.x),
input.mouse_offset.y+((F32)ypos-input.last_mouse_pos.y));
input.last_mouse_pos = v2f((F32)xpos, (F32)ypos);
}
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, "Cubemaps", 0, 0);
if (!window)
{
fprintf(stderr, "[ERROR] Failed to create window.\n");
glfwTerminate();
return(1);
}
glfwMakeContextCurrent(window);
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
glfwSetKeyCallback(window, key_callback);
glfwSetCursorPosCallback(window, cursor_pos_callback);
if (glewInit() != GLEW_OK)
{
fprintf(stderr, "[ERROR] Failed to initialize glew.\n");
glfwTerminate();
return(1);
}
U32 skybox_shader = create_shader_program("shaders/skybox.vs", "shaders/skybox.fs");
U32 reflection_shader = create_shader_program("shaders/reflection.vs", "shaders/reflection.fs");
U32 refraction_shader = create_shader_program("shaders/refraction.vs", "shaders/refraction.fs");
U32 cube_shader = create_shader_program("shaders/cube.vs", "shaders/cube.fs");
U32 grid_texture = load_texture("../../data/textures/grid.png");
const char *cube_texture_filenames[6] = {
"../../data/textures/skybox/right.jpg",
"../../data/textures/skybox/left.jpg",
"../../data/textures/skybox/top.jpg",
"../../data/textures/skybox/bottom.jpg",
"../../data/textures/skybox/front.jpg",
"../../data/textures/skybox/back.jpg"
};
U32 skybox_texture = load_cubemap(cube_texture_filenames);
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, 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);
a = 1.0f;
F32 skybox_cube_vertices[] = {
-a, -a, -a,
a, -a, -a,
a, a, -a,
a, a, -a,
-a, a, -a,
-a, -a, -a,
-a, -a, a,
a, -a, a,
a, a, a,
a, a, a,
-a, a, a,
-a, -a, a,
-a, a, a,
-a, a, -a,
-a, -a, -a,
-a, -a, -a,
-a, -a, a,
-a, a, a,
a, a, a,
a, a, -a,
a, -a, -a,
a, -a, -a,
a, -a, a,
a, a, a,
-a, -a, -a,
a, -a, -a,
a, -a, a,
a, -a, a,
-a, -a, a,
-a, -a, -a,
-a, a, -a,
a, a, -a,
a, a, a,
a, a, a,
-a, a, a,
-a, a, -a,
};
U32 skybox_cube_vao;
glGenVertexArrays(1, &skybox_cube_vao);
glBindVertexArray(skybox_cube_vao);
glGenBuffers(1, &vbo);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glBufferData(GL_ARRAY_BUFFER, sizeof(skybox_cube_vertices), skybox_cube_vertices, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3*sizeof(F32), (void *)0);
glBindVertexArray(0);
F32 normals_cube_vertices[] = {
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f,
0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f,
0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f,
0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f,
0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f,
0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f,
0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f,
-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f,
-0.5f, 0.5f, -0.5f, -1.0f, 0.0f, 0.0f,
-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f,
-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f,
-0.5f, -0.5f, 0.5f, -1.0f, 0.0f, 0.0f,
-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f,
0.5f, 0.5f, -0.5f, 1.0f, 0.0f, 0.0f,
0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f,
0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f,
0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f,
0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f,
0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f,
0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f
};
U32 normals_cube_vao;
glGenVertexArrays(1, &normals_cube_vao);
glBindVertexArray(normals_cube_vao);
glGenBuffers(1, &vbo);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glBufferData(GL_ARRAY_BUFFER, sizeof(normals_cube_vertices), normals_cube_vertices, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6*sizeof(F32), (void *)0);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6*sizeof(F32), (void *)(3*sizeof(F32)));
glBindVertexArray(0);
F32 target_fps = 60.0f;
F32 target_spf = 1.0f/target_fps;
camera_pos = v3f(0.0f, 1.0f, 3.0f);
F32 yaw = 0.0f, pitch = 0.0f;
F32 last_time = glfwGetTime();
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
MAT4 view, projection;
view = mat4_make_translate(v3f_negate(camera_pos));
view = mat4_rotate_angles(view, v3f(pitch, yaw, 0.0f));
projection = perspective(90.0f, (F32)WIDTH/(F32)HEIGHT, 0.1f, 100.0f);
while (!glfwWindowShouldClose(window))
{
glfwPollEvents();
/* INFO(pryazha): update */
V3F left, up, forward;
left = v3f(-view.m0.x, -view.m1.x, -view.m2.x);
up = v3f(view.m0.y, view.m1.y, view.m2.y);
forward = v3f(-view.m0.z, -view.m1.z, -view.m2.z);
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));
camera_pos = v3f_add(camera_pos, dp);
/* NOTE(pryazha): Mouse handling */
F32 sensitivity = 0.1f;
input.mouse_offset = v2f_scalef(input.mouse_offset, sensitivity);
yaw += input.mouse_offset.x;
pitch += input.mouse_offset.y;
if (pitch > 89.0f)
pitch = 89.0f;
if (pitch < -89.0f)
pitch = -89.0f;
view = mat4_make_translate(v3f_negate(camera_pos));
view = mat4_rotate_angles(view, v3f(pitch, yaw, 0.0f));
input_update_last_state(&input);
/* NOTE(pryazha): Render */
glClearColor(0.15f, 0.15f, 0.15f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glUseProgram(cube_shader);
shader_set_mat4fv(cube_shader, "view", view);
shader_set_mat4fv(cube_shader, "projection", projection);
glBindTexture(GL_TEXTURE_2D, grid_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);
}
shader_set_mat4fv(cube_shader, "model", transform_apply(platform_position));
glDrawArrays(GL_TRIANGLES, 0, 36);
glBindVertexArray(0);
glUseProgram(reflection_shader);
shader_set_mat4fv(reflection_shader, "model", mat4_make_translate(v3f(0.0f, 2.0f, 0.0f)));
shader_set_mat4fv(reflection_shader, "view", view);
shader_set_mat4fv(reflection_shader, "projection", projection);
shader_set_3fv(reflection_shader, "camera_pos", camera_pos);
glBindVertexArray(normals_cube_vao);
glBindTexture(GL_TEXTURE_CUBE_MAP, skybox_texture);
glDrawArrays(GL_TRIANGLES, 0, 36);
glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
glBindVertexArray(0);
glUseProgram(refraction_shader);
shader_set_mat4fv(refraction_shader, "model", mat4_make_translate(v3f(2.0f, 2.0f, 0.0f)));
shader_set_mat4fv(refraction_shader, "view", view);
shader_set_mat4fv(refraction_shader, "projection", projection);
shader_set_3fv(refraction_shader, "camera_pos", camera_pos);
glBindVertexArray(normals_cube_vao);
glBindTexture(GL_TEXTURE_CUBE_MAP, skybox_texture);
glDrawArrays(GL_TRIANGLES, 0, 36);
glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
glBindVertexArray(0);
glUseProgram(skybox_shader);
MAT4 rotate_view = mat4_identity();
rotate_view.m0 = v4f(view.m0.x, view.m0.y, view.m0.z, 0.0f);
rotate_view.m1 = v4f(view.m1.x, view.m1.y, view.m1.z, 0.0f);
rotate_view.m2 = v4f(view.m2.x, view.m2.y, view.m2.z, 0.0f);
shader_set_mat4fv(skybox_shader, "view", rotate_view);
shader_set_mat4fv(skybox_shader, "projection", projection);
glBindVertexArray(skybox_cube_vao);
glBindTexture(GL_TEXTURE_CUBE_MAP, skybox_texture);
glDrawArrays(GL_TRIANGLES, 0, 36);
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);
}