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#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <glad/egl.h>
#include <glad/gles2.h>
#define GLFW_INCLUDE_NONE 1
#include <GLFW/glfw3.h>
#ifdef __EMSCRIPTEN__
#include <emscripten/emscripten.h>
#else
#define GLFW_EXPOSE_NATIVE_EGL 1
#include <GLFW/glfw3native.h>
#endif
const GLuint WIDTH = 800, HEIGHT = 600;
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode) {
if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
glfwSetWindowShouldClose(window, GL_TRUE);
}
void render_frame(GLFWwindow *window) {
glfwPollEvents();
glClearColor(0.7f, 0.9f, 0.1f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
glfwSwapBuffers(window);
}
int main(int argc, char **argv) {
glfwInit();
srand(time(NULL));
glfwWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_ES_API);
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
glfwWindowHint(GLFW_CONTEXT_CREATION_API, GLFW_EGL_CONTEXT_API);
glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
GLFWwindow* window = glfwCreateWindow(WIDTH, HEIGHT, "[glad] EGL with GLFW", NULL, NULL);
glfwMakeContextCurrent(window);
glfwSetKeyCallback(window, key_callback);
#ifndef __EMSCRIPTEN__
/* Load EGL */
EGLDisplay display = glfwGetEGLDisplay();
int egl_version = gladLoaderLoadEGL(display);
printf("EGL %d.%d\n", GLAD_VERSION_MAJOR(egl_version), GLAD_VERSION_MINOR(egl_version));
#endif
/* Load GLES */
int gles_version = 0;
if (rand() % 100 < 50) {
printf("-> using GLFW to load GLES2\n");
gles_version = gladLoadGLES2(glfwGetProcAddress);
} else {
printf("-> using GLAD loader to load GLES2\n");
gles_version = gladLoaderLoadGLES2();
}
printf("GLES %d.%d\n", GLAD_VERSION_MAJOR(gles_version), GLAD_VERSION_MINOR(gles_version));
#ifdef __EMSCRIPTEN__
emscripten_set_main_loop_arg((em_arg_callback_func) render_frame, window, 60, 1);
#else
while (!glfwWindowShouldClose(window)) { render_frame(window); }
#endif
glfwTerminate();
return 0;
}
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