1 // 2 // Copyright (c) 2014 The ANGLE Project Authors. All rights reserved. 3 // Use of this source code is governed by a BSD-style license that can be 4 // found in the LICENSE file. 5 // 6 7 // Based on Hello_Triangle.c from 8 // Book: OpenGL(R) ES 2.0 Programming Guide 9 // Authors: Aaftab Munshi, Dan Ginsburg, Dave Shreiner 10 // ISBN-10: 0321502795 11 // ISBN-13: 9780321502797 12 // Publisher: Addison-Wesley Professional 13 // URLs: http://safari.informit.com/9780321563835 14 // http://www.opengles-book.com 15 16 #include "SampleApplication.h" 17 #include "shader_utils.h" 18 19 class HelloTriangleSample : public SampleApplication 20 { 21 public: 22 HelloTriangleSample::HelloTriangleSample() 23 : SampleApplication("HelloTriangle", 1280, 720) 24 { 25 } 26 27 virtual bool initialize() 28 { 29 const std::string vs = SHADER_SOURCE 30 ( 31 attribute vec4 vPosition; 32 void main() 33 { 34 gl_Position = vPosition; 35 } 36 ); 37 38 const std::string fs = SHADER_SOURCE 39 ( 40 precision mediump float; 41 void main() 42 { 43 gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0); 44 } 45 ); 46 47 mProgram = CompileProgram(vs, fs); 48 if (!mProgram) 49 { 50 return false; 51 } 52 53 glClearColor(0.0f, 0.0f, 0.0f, 0.0f); 54 55 return true; 56 } 57 58 virtual void destroy() 59 { 60 glDeleteProgram(mProgram); 61 } 62 63 virtual void draw() 64 { 65 GLfloat vertices[] = 66 { 67 0.0f, 0.5f, 0.0f, 68 -0.5f, -0.5f, 0.0f, 69 0.5f, -0.5f, 0.0f, 70 }; 71 72 // Set the viewport 73 glViewport(0, 0, getWindow()->getWidth(), getWindow()->getHeight()); 74 75 // Clear the color buffer 76 glClear(GL_COLOR_BUFFER_BIT); 77 78 // Use the program object 79 glUseProgram(mProgram); 80 81 // Load the vertex data 82 glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, vertices); 83 glEnableVertexAttribArray(0); 84 85 glDrawArrays(GL_TRIANGLES, 0, 3); 86 } 87 88 private: 89 GLuint mProgram; 90 }; 91 92 int main(int argc, char **argv) 93 { 94 HelloTriangleSample app; 95 return app.run(); 96 } 97
