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#include "pwyazh.h"
#include "GL/glew.h"
#include "GLFW/glfw3.h"
#include "pwyazh_GL.h"
#include "common.h"
static S32 global_width = 1024, global_height = 768;
static Input global_input;
static V3F camera_dp = (V3F){ 0.0f, 0.0f, 0.0f };
static V3F light_pos = (V3F){ 0.0f, 0.0f, 0.0f };
static S32 blinn = 0;
void
key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
{
switch (action)
{
case GLFW_PRESS: {
switch (key)
{
case GLFW_KEY_D: {
global_input.move_right.state = KeyState_PRESS;
} break;
case GLFW_KEY_W: {
global_input.move_forward.state = KeyState_PRESS;
} break;
case GLFW_KEY_A: {
global_input.move_left.state = KeyState_PRESS;
} break;
case GLFW_KEY_S: {
global_input.move_backward.state = KeyState_PRESS;
} break;
case GLFW_KEY_E: {
global_input.move_up.state = KeyState_PRESS;
} break;
case GLFW_KEY_Q: {
global_input.move_down.state = KeyState_PRESS;
} break;
case GLFW_KEY_SPACE: {
global_input.jump.state = KeyState_PRESS;
} break;
case GLFW_KEY_RIGHT: {
global_input.action_right.state = KeyState_PRESS;
} break;
case GLFW_KEY_UP: {
global_input.action_up.state = KeyState_PRESS;
} break;
case GLFW_KEY_LEFT: {
global_input.action_left.state = KeyState_PRESS;
} break;
case GLFW_KEY_ESCAPE: {
global_input.exit.state = KeyState_PRESS;
} break;
}
} break;
case GLFW_RELEASE: {
switch (key)
{
case GLFW_KEY_D: {
global_input.move_right.state = KeyState_RELEASE;
} break;
case GLFW_KEY_W: {
global_input.move_forward.state = KeyState_RELEASE;
} break;
case GLFW_KEY_A: {
global_input.move_left.state = KeyState_RELEASE;
} break;
case GLFW_KEY_S: {
global_input.move_backward.state = KeyState_RELEASE;
} break;
case GLFW_KEY_E: {
global_input.move_up.state = KeyState_RELEASE;
} break;
case GLFW_KEY_Q: {
global_input.move_down.state = KeyState_RELEASE;
} break;
case GLFW_KEY_SPACE: {
global_input.jump.state = KeyState_RELEASE;
} break;
case GLFW_KEY_RIGHT: {
global_input.action_right.state = KeyState_RELEASE;
} break;
case GLFW_KEY_UP: {
global_input.action_up.state = KeyState_RELEASE;
} break;
case GLFW_KEY_LEFT: {
global_input.action_left.state = KeyState_RELEASE;
} break;
case GLFW_KEY_ESCAPE: {
global_input.exit.state = KeyState_RELEASE;
} break;
}
} break;
}
}
void
resize_callback(GLFWwindow* window, int width, int height)
{
global_width = width;
global_height = height;
glViewport(0, 0, global_width, global_height);
}
void
error_callback(int error, const char *desc)
{
fprintf(stderr, "[ERROR] GLFW: %s\n", desc);
}
void
update(State *state)
{
V3F camera_dv = get_dv_camera_orbital(&global_input, state->camera.pos,
v3f_zero(), state->dt, 2.0f);
if (key_is_pressed(global_input.action_up)) {
camera_dv = v3f_scalef(camera_dv, 3.0f);
}
camera_dp = v3f_add(camera_dp, camera_dv);
camera_dp = v3f_scalef(camera_dp, 0.7f);
state->camera.pos = v3f_add(state->camera.pos, camera_dp);
if (key_first_press(global_input.jump))
blinn = blinn ? 0 : 1;
input_update_last_state(&global_input);
}
void
render(State *state, U32 *shaders, U32 texture, Mesh **meshes)
{
MAT4 projection, view, model;
U32 shader;
Mesh *mesh;
glClearColor(0.15f, 0.15f, 0.15f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
projection = perspective(state->camera.fovx, (F32)global_width/(F32)global_height,
state->camera.near, state->camera.far);
view = look_at(state->camera.pos, v3f_zero(), v3f(0.0f, 1.0f, 0.0f));
model = mat4_identity();
U32 mesh_index = 0;
shader = shaders[mesh_index];
mesh = meshes[mesh_index];
glUseProgram(shader);
shader_set_mat4fv(shader, "projection", projection);
shader_set_mat4fv(shader, "view", view);
shader_set_mat4fv(shader, "model", model);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, texture);
shader_set_3fv(shader, "light_pos", light_pos);
shader_set_3fv(shader, "view_pos", state->camera.pos);
shader_set_1i(shader, "blinn", blinn);
mesh_draw(mesh);
mesh_index++;
shader = shaders[mesh_index];
mesh = meshes[mesh_index];
glUseProgram(shader);
shader_set_mat4fv(shader, "projection", projection);
shader_set_mat4fv(shader, "view", view);
model = mat4_make_scale(v3f(0.1f, 0.1f, 0.1f));
shader_set_mat4fv(shader, "model", model);
mesh_draw(mesh);
glBindTexture(GL_TEXTURE_2D, 0);
}
int
main(void)
{
GLFWwindow *window;
Arena *arena;
State state;
Mesh *meshes[2];
U32 shaders[2];
F64 time, last_time;
U32 texture;
glfwSetErrorCallback(error_callback);
if (glfwInit() == GLFW_FALSE)
return(1);
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_SAMPLES, 4);
window = glfwCreateWindow(global_width, global_height, "Blinn-Phong shading", 0, 0);
if (!window)
goto error;
glfwSetKeyCallback(window, key_callback);
glfwSetWindowSizeCallback(window, resize_callback);
glfwMakeContextCurrent(window);
if (glewInit() != GLEW_OK)
goto error;
glEnable(GL_DEPTH_TEST);
glEnable(GL_MULTISAMPLE);
/* NOTE(pryazha): init */
arena = arena_alloc(Megabytes(64));
state.camera = (Camera){ v3f(0.0f, 0.0f, 3.0f), 90.0f, 0.1f, 1000.0f };
Vertex vertices[] = {
// positions // normals // texcoords
vertex(v3f( 10.0f, -0.5f, 10.0f), v3f(0.0f, 1.0f, 0.0f), v2f(10.0f, 0.0f)),
vertex(v3f(-10.0f, -0.5f, 10.0f), v3f(0.0f, 1.0f, 0.0f), v2f( 0.0f, 0.0f)),
vertex(v3f(-10.0f, -0.5f, -10.0f), v3f(0.0f, 1.0f, 0.0f), v2f( 0.0f, 10.0f)),
vertex(v3f( 10.0f, -0.5f, 10.0f), v3f(0.0f, 1.0f, 0.0f), v2f(10.0f, 0.0f)),
vertex(v3f(-10.0f, -0.5f, -10.0f), v3f(0.0f, 1.0f, 0.0f), v2f( 0.0f, 10.0f)),
vertex(v3f( 10.0f, -0.5f, -10.0f), v3f(0.0f, 1.0f, 0.0f), v2f(10.0f, 10.0f))
};
U32 indices[] = { 0, 1, 2, 3, 4, 5 };
meshes[0] = mesh_init(arena, vertices, 6, indices, 6);
meshes[1] = mesh_load_obj(arena, "../../data/models/cube.obj");
shaders[0] = create_shader_program("shaders/blinn_phong.vs", "shaders/blinn_phong.fs");
shaders[1] = create_shader_program("shaders/light.vs", "shaders/light.fs");
texture = load_texture("../../data/textures/wood.png");
last_time = glfwGetTime();
while (!glfwWindowShouldClose(window))
{
glfwPollEvents();
if (key_first_press(global_input.exit))
glfwSetWindowShouldClose(window, GLFW_TRUE);
update(&state);
render(&state, shaders, texture, meshes);
glfwSwapBuffers(window);
time = glfwGetTime();
state.dt = time-last_time;
last_time = time;
#if 0
fprintf(stdout, "[INFO]: dt: %f\n", state.dt);
#endif
}
glfwTerminate();
return(0);
error:
glfwTerminate();
return(1);
}
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