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#include <stdio.h>
#include <stdlib.h>
#include <glad/gl.h>
#ifdef __APPLE__
#include <GLUT/glut.h>
#else
#include <GL/glut.h>
#endif
// This file is a modified version of gl3w's test.c
// https://github.com/skaslev/gl3w/blob/master/src/test.c
// Compile:
// gcc example/c/simple.c -Ibuild/include build/src/glad.c -lglut -ldl
static int width = 600, height = 600;
static void display(void)
{
glClearColor(1.0f, 0.2f, 0.7f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glutSwapBuffers();
glutPostRedisplay();
}
static void reshape(int w, int h)
{
width = w > 1 ? w : 1;
height = h > 1 ? h : 1;
glViewport(0, 0, width, height);
glClearDepth(1.0);
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glEnable(GL_DEPTH_TEST);
}
static void keyboard(unsigned char key, int x, int y)
{
switch (key) {
case 27: // Escape key
glutDestroyWindow(1);
return;
}
glutPostRedisplay();
}
int main(int argc, char **argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGBA | GLUT_DEPTH | GLUT_DOUBLE);
glutInitWindowSize(width, height);
glutCreateWindow("cookie");
glutReshapeFunc(reshape);
glutDisplayFunc(display);
glutKeyboardFunc(keyboard);
// initialize glad after creating a context
int version = gladLoaderLoadGL();
if(version == 0) {
printf("Something went wrong!\n");
exit(-1);
}
printf("OpenGL %d.%d\n", GLAD_VERSION_MAJOR(version), GLAD_VERSION_MINOR(version));
if (!GLAD_GL_VERSION_2_0) {
printf("Your system doesn't support OpenGL >= 2!\n");
return -1;
}
printf("OpenGL %s, GLSL %s\n",
glGetString(GL_VERSION),
glGetString(GL_SHADING_LANGUAGE_VERSION));
glutMainLoop();
return 0;
}
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