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/*
* Copyright (C) 2018 Tomasz Kramkowski <tk@the-tk.com>
* SPDX-License-Identifier: MIT
*/
#include <SDL.h>
#include <stdbool.h>
#include "assets.h"
#include "eprintf.h"
#include "gl.h"
#include "glprog.h"
#include "linmath.h"
#include "nelem.h"
#include "model.h"
enum {
WIDTH = 800,
HEIGHT = 600,
};
# define PI 3.14159265358979323846
#define FOV (PI * 0.5)
void viewport(GLuint proj, int width, int height)
{
mat4x4 pers;
gl_viewport(0, 0, width, height);
mat4x4_perspective(pers, FOV, (float)width / (float)height, 0.1, 100);
gl_uni_setm4fv(proj, 1, GL_FALSE, pers[0]);
}
int main(int argc, char **argv)
{
bool running = true;
SDL_Window *win;
SDL_GLContext *glc;
GLuint prog;
struct {
GLint model, view, proj;
} uni;
mat4x4 view;
FILE *cube_file;
struct fmd cube_fmd;
struct model cube_model;
setprogname(argc >= 1 && argv[0] != NULL ? argv[0] : "faqe");
if (SDL_Init(SDL_INIT_VIDEO) != 0)
eprintf("Failed to initialise SDL: %s", SDL_GetError());
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
win = SDL_CreateWindow("faqe",
SDL_WINDOWPOS_UNDEFINED,
SDL_WINDOWPOS_UNDEFINED,
WIDTH, HEIGHT,
SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE);
if (win == NULL)
eprintf("Failed to create window: %s", SDL_GetError());
glc = SDL_GL_CreateContext(win);
if (glc == NULL)
eprintf("Failed to create OpenGL context: %s", SDL_GetError());
gl_load((gl_loadfunc *)SDL_GL_GetProcAddress);
cube_file = fopen("cube.fmd", "rb");
if (cube_file == NULL)
eprintf("Could not open 'cube.fmd':");
fmd_load(&cube_fmd, cube_file);
model_load(&cube_model, &cube_fmd);
fmd_free(&cube_fmd);
fclose(cube_file);
prog = glprog_load(2, (struct shdrdat []){
{ GL_VERTEX_SHADER, vert_glsl.data, vert_glsl.size },
{ GL_FRAGMENT_SHADER, frag_glsl.data, frag_glsl.size },
},
3, (struct unidat []){
{ "model", &uni.model },
{ "view", &uni.view },
{ "proj", &uni.proj },
});
viewport(uni.proj, WIDTH, HEIGHT);
gl_enable(GL_DEPTH_TEST);
while (running) {
mat4x4 model;
SDL_Event ev;
float secs;
secs = SDL_GetTicks() * 0.0001;
mat4x4_look_at(view, (vec3){ 0, 0, 3 }, (vec3){ 0, 0, 0 }, (vec3){ 0, 1, 0 });
gl_uni_setm4fv(uni.view, 1, GL_FALSE, view[0]);
while (SDL_PollEvent(&ev)) {
switch (ev.type) {
case SDL_KEYDOWN:
case SDL_KEYUP:
if (ev.key.state != SDL_RELEASED
|| ev.key.keysym.sym != SDLK_ESCAPE)
break;
/* fallthrough */
case SDL_QUIT:
running = false;
break;
case SDL_WINDOWEVENT:
switch (ev.window.event) {
case SDL_WINDOWEVENT_SIZE_CHANGED:
viewport(uni.proj,
ev.window.data1,
ev.window.data2);
}
break;
}
}
gl_clearcolor(0.2, 0.3, 0.3, 1.0);
gl_clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
gl_prog_use(prog);
mat4x4_identity(model);
mat4x4_rotate_X(model, model, secs * 3);
mat4x4_rotate_Y(model, model, secs * 2);
mat4x4_rotate_Z(model, model, secs * 4);
gl_uni_setm4fv(uni.model, 1, GL_TRUE, model[0]);
model_render(&cube_model);
gl_va_bind(0);
SDL_GL_SwapWindow(win);
}
SDL_GL_DeleteContext(glc);
SDL_DestroyWindow(win);
SDL_Quit();
}
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