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// This example requires you to generate glad with the --on-demand option and optionally --loader and --debug.
// gcc -o gl_glfw_on_demand example/c/gl_glfw_on_demand.c build/src/gl.c -Ibuild/include -ldl -lglfw
#include <stdlib.h>
#include <stdio.h>
#include <glad/gl.h>
#include <GLFW/glfw3.h>
const GLuint WIDTH = 800, HEIGHT = 600;
static void pre_call_gl_callback(const char *name, GLADapiproc apiproc, int len_args, ...) {
printf("about to call gl func: %s\n", name);
}
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode) {
if (action != GLFW_PRESS) {
return;
}
if (key == GLFW_KEY_ESCAPE) {
glfwSetWindowShouldClose(window, GL_TRUE);
#ifdef GLAD_OPTION_GL_DEBUG
} else if (key == GLFW_KEY_H) {
printf("Installing glad debug function pointers\n");
gladInstallGLDebug();
} else if (key == GLFW_KEY_J) {
printf("Uninstalling glad debug function pointers\n");
gladUninstallGLDebug();
#endif
}
}
int main(void) {
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
GLFWwindow* window = glfwCreateWindow(WIDTH, HEIGHT, "[glad] GL with GLFW", NULL, NULL);
glfwMakeContextCurrent(window);
glfwSetKeyCallback(window, key_callback);
// If glad is generated with the --loader and --on-demand option
// you don't have to call any glad function.
// It is recommended to use the loader provided by your context creation library
// instead of the glad loader.
#ifndef GLAD_GL_LOADER
gladSetGLOnDemandLoader(glfwGetProcAddress);
#endif
#ifdef GLAD_OPTION_GL_DEBUG
gladUninstallGLDebug();
gladSetGLPreCallback(pre_call_gl_callback);
#endif
while (!glfwWindowShouldClose(window)) {
glfwPollEvents();
glClearColor(0.7f, 0.9f, 0.1f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
glfwSwapBuffers(window);
}
glfwTerminate();
return 0;
}
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