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  

最近开始对OpenGL进行了一下恶补，不得不说，蓝宝书，真的是本好书！