103 lines
2.8 KiB
C
103 lines
2.8 KiB
C
//========================================================================
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// Simple GLFW example
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// Copyright (c) Camilla Berglund <elmindreda@elmindreda.org>
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//
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// This software is provided 'as-is', without any express or implied
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// warranty. In no event will the authors be held liable for any damages
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// arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it
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// freely, subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented; you must not
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// claim that you wrote the original software. If you use this software
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// in a product, an acknowledgment in the product documentation would
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// be appreciated but is not required.
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//
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// 2. Altered source versions must be plainly marked as such, and must not
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// be misrepresented as being the original software.
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//
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// 3. This notice may not be removed or altered from any source
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// distribution.
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//
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//========================================================================
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//! [code]
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#include <GLFW/glfw3.h>
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#include <stdlib.h>
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#include <stdio.h>
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static void error_callback(int error, const char* description)
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{
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fputs(description, stderr);
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}
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static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
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{
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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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int main(void)
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{
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GLFWwindow* window;
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glfwSetErrorCallback(error_callback);
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if (!glfwInit())
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exit(EXIT_FAILURE);
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window = glfwCreateWindow(640, 480, "Simple example", NULL, NULL);
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if (!window)
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{
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glfwTerminate();
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exit(EXIT_FAILURE);
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}
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glfwMakeContextCurrent(window);
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glfwSwapInterval(1);
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glfwSetKeyCallback(window, key_callback);
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while (!glfwWindowShouldClose(window))
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{
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float ratio;
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int width, height;
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glfwGetFramebufferSize(window, &width, &height);
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ratio = width / (float) height;
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glViewport(0, 0, width, height);
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glClear(GL_COLOR_BUFFER_BIT);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glOrtho(-ratio, ratio, -1.f, 1.f, 1.f, -1.f);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glRotatef((float) glfwGetTime() * 50.f, 0.f, 0.f, 1.f);
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glBegin(GL_TRIANGLES);
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glColor3f(1.f, 0.f, 0.f);
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glVertex3f(-0.6f, -0.4f, 0.f);
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glColor3f(0.f, 1.f, 0.f);
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glVertex3f(0.6f, -0.4f, 0.f);
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glColor3f(0.f, 0.f, 1.f);
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glVertex3f(0.f, 0.6f, 0.f);
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glEnd();
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glfwSwapBuffers(window);
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glfwPollEvents();
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}
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glfwDestroyWindow(window);
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glfwTerminate();
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exit(EXIT_SUCCESS);
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}
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//! [code]
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