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| 1 // | |
| 2 // Book: OpenGL(R) ES 2.0 Programming Guide | |
| 3 // Authors: Aaftab Munshi, Dan Ginsburg, Dave Shreiner | |
| 4 // ISBN-10: 0321502795 | |
| 5 // ISBN-13: 9780321502797 | |
| 6 // Publisher: Addison-Wesley Professional | |
| 7 // URLs: http://safari.informit.com/9780321563835 | |
| 8 // http://www.opengles-book.com | |
| 9 // | |
| 10 | |
| 11 // ESShader.c | |
| 12 // | |
| 13 // Utility functions for loading shaders and creating program objects. | |
| 14 // | |
| 15 | |
| 16 /// | |
| 17 // Includes | |
| 18 // | |
| 19 #include "esUtil.h" | |
| 20 #include <stdlib.h> | |
| 21 | |
| 22 ////////////////////////////////////////////////////////////////// | |
| 23 // | |
| 24 // Private Functions | |
| 25 // | |
| 26 // | |
| 27 | |
| 28 | |
| 29 | |
| 30 ////////////////////////////////////////////////////////////////// | |
| 31 // | |
| 32 // Public Functions | |
| 33 // | |
| 34 // | |
| 35 | |
| 36 // | |
| 37 /// | |
| 38 /// \brief Load a shader, check for compile errors, print error messages to outp
ut log | |
| 39 /// \param type Type of shader (GL_VERTEX_SHADER or GL_FRAGMENT_SHADER) | |
| 40 /// \param shaderSrc Shader source string | |
| 41 /// \return A new shader object on success, 0 on failure | |
| 42 // | |
| 43 GLuint esLoadShader ( GLenum type, const char *shaderSrc ) | |
| 44 { | |
| 45 GLuint shader; | |
| 46 GLint compiled; | |
| 47 | |
| 48 // Create the shader object | |
| 49 shader = glCreateShader ( type ); | |
| 50 | |
| 51 if ( shader == 0 ) | |
| 52 return 0; | |
| 53 | |
| 54 // Load the shader source | |
| 55 glShaderSource ( shader, 1, &shaderSrc, NULL ); | |
| 56 | |
| 57 // Compile the shader | |
| 58 glCompileShader ( shader ); | |
| 59 | |
| 60 // Check the compile status | |
| 61 glGetShaderiv ( shader, GL_COMPILE_STATUS, &compiled ); | |
| 62 | |
| 63 if ( !compiled ) | |
| 64 { | |
| 65 GLint infoLen = 0; | |
| 66 | |
| 67 glGetShaderiv ( shader, GL_INFO_LOG_LENGTH, &infoLen ); | |
| 68 | |
| 69 if ( infoLen > 1 ) | |
| 70 { | |
| 71 char* infoLog = malloc (sizeof(char) * infoLen ); | |
| 72 | |
| 73 glGetShaderInfoLog ( shader, infoLen, NULL, infoLog ); | |
| 74 esLogMessage ( "Error compiling shader:\n%s\n", infoLog ); | |
| 75 | |
| 76 free ( infoLog ); | |
| 77 } | |
| 78 | |
| 79 glDeleteShader ( shader ); | |
| 80 return 0; | |
| 81 } | |
| 82 | |
| 83 return shader; | |
| 84 | |
| 85 } | |
| 86 | |
| 87 | |
| 88 // | |
| 89 /// | |
| 90 /// \brief Load a vertex and fragment shader, create a program object, link prog
ram. | |
| 91 // Errors output to log. | |
| 92 /// \param vertShaderSrc Vertex shader source code | |
| 93 /// \param fragShaderSrc Fragment shader source code | |
| 94 /// \return A new program object linked with the vertex/fragment shader pair, 0
on failure | |
| 95 // | |
| 96 GLuint esLoadProgram ( const char *vertShaderSrc, const char *fragShaderSrc ) | |
| 97 { | |
| 98 GLuint vertexShader; | |
| 99 GLuint fragmentShader; | |
| 100 GLuint programObject; | |
| 101 GLint linked; | |
| 102 | |
| 103 // Load the vertex/fragment shaders | |
| 104 vertexShader = esLoadShader ( GL_VERTEX_SHADER, vertShaderSrc ); | |
| 105 if ( vertexShader == 0 ) | |
| 106 return 0; | |
| 107 | |
| 108 fragmentShader = esLoadShader ( GL_FRAGMENT_SHADER, fragShaderSrc ); | |
| 109 if ( fragmentShader == 0 ) | |
| 110 { | |
| 111 glDeleteShader( vertexShader ); | |
| 112 return 0; | |
| 113 } | |
| 114 | |
| 115 // Create the program object | |
| 116 programObject = glCreateProgram ( ); | |
| 117 | |
| 118 if ( programObject == 0 ) | |
| 119 return 0; | |
| 120 | |
| 121 glAttachShader ( programObject, vertexShader ); | |
| 122 glAttachShader ( programObject, fragmentShader ); | |
| 123 | |
| 124 // Link the program | |
| 125 glLinkProgram ( programObject ); | |
| 126 | |
| 127 // Check the link status | |
| 128 glGetProgramiv ( programObject, GL_LINK_STATUS, &linked ); | |
| 129 | |
| 130 if ( !linked ) | |
| 131 { | |
| 132 GLint infoLen = 0; | |
| 133 | |
| 134 glGetProgramiv ( programObject, GL_INFO_LOG_LENGTH, &infoLen ); | |
| 135 | |
| 136 if ( infoLen > 1 ) | |
| 137 { | |
| 138 char* infoLog = malloc (sizeof(char) * infoLen ); | |
| 139 | |
| 140 glGetProgramInfoLog ( programObject, infoLen, NULL, infoLog ); | |
| 141 esLogMessage ( "Error linking program:\n%s\n", infoLog ); | |
| 142 | |
| 143 free ( infoLog ); | |
| 144 } | |
| 145 | |
| 146 glDeleteProgram ( programObject ); | |
| 147 return 0; | |
| 148 } | |
| 149 | |
| 150 // Free up no longer needed shader resources | |
| 151 glDeleteShader ( vertexShader ); | |
| 152 glDeleteShader ( fragmentShader ); | |
| 153 | |
| 154 return programObject; | |
| 155 } | |
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Chromium Code Reviews
Issue 543002:
Renamed gles_book_examples to gles2_book to make it shorter and more correct.... (Closed)
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