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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"
enum {
WIDTH = 800,
HEIGHT = 600,
};
int main(int argc, char **argv)
{
bool running = true;
SDL_Window *win;
SDL_GLContext *glc;
GLuint ebo, vbo, vao, prog;
GLint ucolor;
struct vertex {
vec3 pos;
vec3 col;
vec2 uv;
} verts[] = {
{{ 0.5, 0.5, 0.0 }, { 1.0, 0.0, 0.0 }, { 1.0, 1.0 }},
{{ 0.5, -0.5, 0.0 }, { 0.0, 1.0, 0.0 }, { 1.0, 0.0 }},
{{ -0.5, -0.5, 0.0 }, { 0.0, 0.0, 1.0 }, { 0.0, 0.0 }},
{{ -0.5, 0.5, 0.0 }, { 1.0, 1.0, 0.0 }, { 0.0, 1.0 }},
};
GLuint idxs[] = {
0, 1, 3,
1, 2, 3,
};
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);
gl_viewport(0, 0, WIDTH, HEIGHT);
gl_buf_gen(1, &vbo);
gl_buf_gen(1, &ebo);
gl_va_gen(1, &vao);
gl_va_bind(vao);
gl_buf_bind(GL_ARRAY_BUFFER, vbo);
gl_buf_data(GL_ARRAY_BUFFER, sizeof verts, verts, GL_STATIC_DRAW);
gl_buf_bind(GL_ELEMENT_ARRAY_BUFFER, ebo);
gl_buf_data(GL_ELEMENT_ARRAY_BUFFER, sizeof idxs, idxs, GL_STATIC_DRAW);
gl_va_define(0, NELEM(verts[0].pos), GL_FLOAT, GL_FALSE, sizeof *verts, (void *)offsetof(struct vertex, pos));
gl_va_enable(0);
gl_va_define(1, NELEM(verts[0].col), GL_FLOAT, GL_FALSE, sizeof *verts, (void *)offsetof(struct vertex, col));
gl_va_enable(1);
gl_va_define(2, NELEM(verts[0].uv), GL_FLOAT, GL_FALSE, sizeof *verts, (void *)offsetof(struct vertex, uv));
gl_va_enable(2);
prog = glprog_load(2, (struct shdrdat []){
{ GL_VERTEX_SHADER, vert_glsl.data, vert_glsl.size },
{ GL_FRAGMENT_SHADER, frag_glsl.data, frag_glsl.size },
},
1, &(struct unidat){ "ucolor", &ucolor });
gl_poly_mode(GL_FRONT_AND_BACK, GL_LINE);
while (running) {
SDL_Event ev;
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:
gl_viewport(0, 0,
ev.window.data1,
ev.window.data2);
}
break;
}
}
gl_clearcolor(0.2, 0.3, 0.3, 1.0);
gl_clear(GL_COLOR_BUFFER_BIT);
gl_prog_use(prog);
gl_va_bind(vao);
gl_draw_elems(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
gl_va_bind(0);
SDL_GL_SwapWindow(win);
}
SDL_GL_DeleteContext(glc);
SDL_DestroyWindow(win);
SDL_Quit();
}
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