openGL的第一课

  1 #include <stdio.h>
  2 #include <GLTools.h>
  3 
  4 #include <GLShaderManager.h>
  5 
  6  
  7 
  8 #ifdef __APPLE__
  9 
 10 #include <GLUT/glut.h>
 11 
 12 #else
 13 
 14 #define FREEGLUT_STATIC
 15 
 16 #include <GL/glut.h>
 17 
 18 #endif
 19 
 20  
 21 
 22 GLBatch triangleBatch;
 23 
 24 GLShaderManager shaderManager;
 25 
 26  
 27 
 28 void changeSize( int W, int H )
 29 
 30 {
 31 
 32     glViewport(0, 0, W, H);
 33 
 34 }
 35 
 36  
 37 
 38 void SetupRc()
 39 
 40 {
 41 
 42     glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
 43 
 44     
 45 
 46     shaderManager.InitializeStockShaders();
 47 
 48     
 49 
 50     GLfloat vVerts[] = { -0.5f, 0.0f, 0.0f,
 51 
 52                         0.5f, 0.0f, 0.0f,
 53 
 54                         0.0f, 0.5f, 0.0f};
 55 
 56     
 57 
 58     triangleBatch.Begin(GL_TRIANGLES, 3);
 59 
 60     triangleBatch.CopyVertexData3f(vVerts);
 61 
 62     triangleBatch.End();
 63 
 64 }
 65 
 66  
 67 
 68 void   RenderScene()
 69 
 70 {
 71 
 72     glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT );
 73 
 74     
 75 
 76     GLfloat vRed[] = { 1.0f, 0.0f, 0.0f, 1.0f };
 77 
 78     shaderManager.UseStockShader( GLT_SHADER_IDENTITY,vRed );
 79 
 80     triangleBatch.Draw();
 81 
 82     
 83 
 84     glutSwapBuffers();
 85 
 86 }
 87 
 88  
 89 
 90 int main( int argc, char* argv[] )
 91 
 92 {
 93 
 94     //设置当前工作目录
 95 
 96     gltSetWorkingDirectory(argv[0]);
 97 
 98     
 99 
100     //初始化glut
101 
102     glutInit(&argc, argv);
103 
104     
105 
106     //设置显示模式
107 
108     glutInitDisplayMode( GLUT_DEPTH|GLUT_RGBA|GLUT_STENCIL|GLUT_DOUBLE );
109 
110     
111 
112     //初始化窗口
113 
114     glutInitWindowSize(800, 600);
115 
116     
117 
118     //创建窗口，并且命名
119 
120     glutCreateWindow( "Triangle" );
121 
122     
123 
124     
125 
126     glutReshapeFunc(changeSize);
127 
128     
129 
130     glutDisplayFunc(RenderScene);
131 
132     
133 
134     GLenum err = glewInit();
135 
136     if (err !=GLEW_OK )
137 
138     {
139 
140         fprintf(stderr, "GLEW Error: %s\n",glewGetErrorString(err) );
141 
142         return 1;
143 
144     }
145 
146     
147 
148     SetupRc();
149 
150     
151 
152     //开启OpenGL主循环
153 
154     glutMainLoop();
155 
156     
157 
158     
159 
160     return 0;
161 
162 }
163 
164