Created
September 6, 2018 13:10
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OpenGL program using GLFW3 to rotate a triangle
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| #include <GLFW/glfw3.h> | |
| #include <stdlib.h> | |
| #include <stdio.h> | |
| static void error_callback(int error, const char* description) | |
| { | |
| fputs(description, stderr); | |
| } | |
| static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods) | |
| { | |
| if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS) | |
| glfwSetWindowShouldClose(window, GL_TRUE); | |
| } | |
| int main(void) | |
| { | |
| GLFWwindow* window; | |
| glfwSetErrorCallback(error_callback); | |
| if (!glfwInit()) | |
| exit(EXIT_FAILURE); | |
| window = glfwCreateWindow(640, 480, "Simple example", NULL, NULL); | |
| if (!window) | |
| { | |
| glfwTerminate(); | |
| exit(EXIT_FAILURE); | |
| } | |
| glfwMakeContextCurrent(window); | |
| glfwSetKeyCallback(window, key_callback); | |
| while (!glfwWindowShouldClose(window)) | |
| { | |
| float ratio; | |
| int width, height; | |
| glfwGetFramebufferSize(window, &width, &height); | |
| ratio = width / (float) height; | |
| glViewport(0, 0, width, height); | |
| glClear(GL_COLOR_BUFFER_BIT); | |
| glMatrixMode(GL_PROJECTION); | |
| glLoadIdentity(); | |
| glOrtho(-ratio, ratio, -1.f, 1.f, 1.f, -1.f); | |
| glMatrixMode(GL_MODELVIEW); | |
| glLoadIdentity(); | |
| glRotatef((float) glfwGetTime() * 50.f, 0.f, 0.f, 1.f); | |
| glBegin(GL_TRIANGLES); | |
| glColor3f(1.f, 0.f, 0.f); | |
| glVertex3f(-0.6f, -0.4f, 0.f); | |
| glColor3f(0.f, 1.f, 0.f); | |
| glVertex3f(0.6f, -0.4f, 0.f); | |
| glColor3f(0.f, 0.f, 1.f); | |
| glVertex3f(0.f, 0.6f, 0.f); | |
| glEnd(); | |
| glfwSwapBuffers(window); | |
| glfwPollEvents(); | |
| } | |
| glfwDestroyWindow(window); | |
| glfwTerminate(); | |
| exit(EXIT_SUCCESS); | |
| } |
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