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