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/*
* Copyright (C) 2018 Tomasz Kramkowski <tk@the-tk.com>
* SPDX-License-Identifier: MIT
*/
#include <GLFW/glfw3.h>
#include <stdbool.h>
#include "eprintf.h"
#include "gldefs.h"
#include "linmath.h"
#include "loadgl.h"
#include "shaders.h"
enum {
WIDTH = 800,
HEIGHT = 600,
LOGSIZE = 1024,
};
void fb_size_cb(GLFWwindow *win, int width, int height)
{
(void)win;
gl_viewport(0, 0, width, height);
}
void take_input(GLFWwindow *win)
{
if (glfwGetKey(win, GLFW_KEY_ESCAPE) == GLFW_PRESS)
glfwSetWindowShouldClose(win, true);
}
GLuint load_shader(GLenum type, const char *data, GLint size)
{
GLuint shdr;
GLint success;
char log[LOGSIZE];
shdr = gl_shdr_create(type);
gl_shdr_source(shdr, 1, &data, &size);
gl_shdr_compile(shdr);
gl_shdr_param(shdr, GL_COMPILE_STATUS, &success);
if (!success) {
gl_shdr_infolog(shdr, sizeof log, NULL, log);
eprintf("Failed to compile shader:\n%s", log);
}
return shdr;
}
GLuint load_prog(void)
{
GLuint vert, frag, prog;
GLuint success;
char log[LOGSIZE];
vert = load_shader(GL_VERTEX_SHADER, shader_vert_data, shader_vert_size);
frag = load_shader(GL_FRAGMENT_SHADER, shader_frag_data, shader_frag_size);
prog = gl_prog_create();
gl_prog_attachshdr(prog, vert);
gl_prog_attachshdr(prog, frag);
gl_prog_link(prog);
gl_prog_param(prog, GL_COMPILE_STATUS, &success);
if (!success) {
gl_prog_infolog(prog, sizeof log, NULL, log);
eprintf("Failed to link program:\n%s", log);
}
gl_shdr_del(vert);
gl_shdr_del(frag);
return prog;
}
int main(int argc, char **argv)
{
GLFWwindow *win;
int ret;
GLuint ebo, vbo, vao, prog;
vec3 verts[] = {
{ 0.5f, 0.5f, 0.0f },
{ 0.5f, -0.5f, 0.0f },
{ -0.5f, -0.5f, 0.0f },
{ -0.5f, 0.5f, 0.0f },
};
GLuint idxs[] = {
0, 1, 3,
1, 2, 3,
};
setprogname(argc >= 1 && argv[0] != NULL ? argv[0] : "gltest");
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
win = glfwCreateWindow(WIDTH, HEIGHT, "gltest", NULL, NULL);
if (win == NULL)
eprintf("Failed to create GLFW window");
glfwMakeContextCurrent(win);
ret = lgl_load((lgl_loadfunc *)glfwGetProcAddress);
if (ret != 0)
eprintf("Failed to load GL: %s", lgl_strerror(ret));
glfwSetFramebufferSizeCallback(win, &fb_size_cb);
fb_size_cb(win, 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, 3, GL_FLOAT, GL_FALSE, sizeof *verts, 0);
gl_va_enable(0);
prog = load_prog();
gl_poly_mode(GL_FRONT_AND_BACK, GL_LINE);
while (!glfwWindowShouldClose(win)) {
take_input(win);
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);
glfwSwapBuffers(win);
glfwPollEvents();
}
glfwTerminate();
}
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