56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
#include <stdlib.h>
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#include <stdio.h>
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#include <glad/gles2.h>
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#define GLFW_INCLUDE_NONE 1
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#include <GLFW/glfw3.h>
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#ifdef __EMSCRIPTEN__
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#include <emscripten/emscripten.h>
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#endif
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const GLuint WIDTH = 800, HEIGHT = 600;
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void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode) {
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if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
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glfwSetWindowShouldClose(window, GL_TRUE);
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}
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void render_frame(GLFWwindow *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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int main(void) {
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glfwInit();
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glfwWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_ES_API);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
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glfwWindowHint(GLFW_CONTEXT_CREATION_API, GLFW_EGL_CONTEXT_API);
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glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
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GLFWwindow *window = glfwCreateWindow(WIDTH, HEIGHT, "[glad] GLES2 with GLFW", NULL, NULL);
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glfwMakeContextCurrent(window);
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glfwSetKeyCallback(window, key_callback);
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/* Load GLES */
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int gles_version = gladLoadGLES2(glfwGetProcAddress);
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printf("GLES %d.%d\n", GLAD_VERSION_MAJOR(gles_version), GLAD_VERSION_MINOR(gles_version));
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#ifdef __EMSCRIPTEN__
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emscripten_set_main_loop_arg((em_arg_callback_func) render_frame, window, 60, 1);
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#else
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while (!glfwWindowShouldClose(window)) { render_frame(window); }
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#endif
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return 0;
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}
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