slideshow/source/engine/OGLTrans/OGLTrans_Shaders.cxx

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  30
  31 #include <osl/diagnose.hxx>
  32
  33 #include "OGLTrans_Shaders.hxx"
  34
  35 namespace unx
  36 {
  37 #include <GL/glx.h>
  38 #include <GL/glxext.h>
  39 }
  40
  41 bool OGLShaders::cbInitialized = false;
  42
  43 #ifdef GL_VERSION_2_0
  44
  45 PFNGLCREATESHADERPROC OGLShaders::glCreateShader = NULL;
  46 PFNGLSHADERSOURCEPROC OGLShaders::glShaderSource = NULL;
  47 PFNGLCOMPILESHADERPROC OGLShaders::glCompileShader = NULL;
  48 PFNGLGETSHADERIVPROC OGLShaders::glGetShaderiv = NULL;
  49 PFNGLGETSHADERINFOLOGPROC OGLShaders::glGetShaderInfoLog = NULL;
  50 PFNGLDELETESHADERPROC OGLShaders::glDeleteShader = NULL;
  51 PFNGLCREATEPROGRAMPROC OGLShaders::glCreateProgram = NULL;
  52 PFNGLATTACHSHADERPROC OGLShaders::glAttachShader = NULL;
  53 PFNGLLINKPROGRAMPROC OGLShaders::glLinkProgram = NULL;
  54 PFNGLGETPROGRAMIVPROC OGLShaders::glGetProgramiv = NULL;
  55 PFNGLGETPROGRAMINFOLOGPROC OGLShaders::glGetProgramInfoLog = NULL;
  56 PFNGLUSEPROGRAMPROC OGLShaders::glUseProgram = NULL;
  57 PFNGLDELETEPROGRAMPROC OGLShaders::glDeleteProgram = NULL;
  58 PFNGLGETUNIFORMLOCATIONPROC OGLShaders::glGetUniformLocation = NULL;
  59 PFNGLUNIFORM1IPROC OGLShaders::glUniform1i = NULL;
  60 PFNGLUNIFORM1FPROC OGLShaders::glUniform1f = NULL;
  61 #endif
  62
  63 bool OGLShaders::Initialize()
  64 {
  65 #ifdef GL_VERSION_2_0
  66     if( !cbInitialized ) {
  67         glCreateShader = (PFNGLCREATESHADERPROC) unx::glXGetProcAddress( (unsigned char *) "glCreateShader" );
  68         glShaderSource = (PFNGLSHADERSOURCEPROC) unx::glXGetProcAddress( (unsigned char *) "glShaderSource" );
  69         glCompileShader = (PFNGLCOMPILESHADERPROC) unx::glXGetProcAddress( (unsigned char *) "glCompileShader" );
  70         glGetShaderiv = (PFNGLGETSHADERIVPROC) unx::glXGetProcAddress( (unsigned char *) "glGetShaderiv" );
  71         glGetShaderInfoLog = (PFNGLGETSHADERINFOLOGPROC) unx::glXGetProcAddress( (unsigned char *) "glGetShaderInfoLog" );
  72         glDeleteShader = (PFNGLDELETESHADERPROC) unx::glXGetProcAddress( (unsigned char *) "glDeleteShader" );
  73         glCreateProgram = (PFNGLCREATEPROGRAMPROC) unx::glXGetProcAddress( (unsigned char *) "glCreateProgram" );
  74         glAttachShader = (PFNGLATTACHSHADERPROC) unx::glXGetProcAddress( (unsigned char *) "glAttachShader" );
  75         glLinkProgram = (PFNGLLINKPROGRAMPROC) unx::glXGetProcAddress( (unsigned char *) "glLinkProgram" );
  76         glGetProgramiv = (PFNGLGETPROGRAMIVPROC) unx::glXGetProcAddress( (unsigned char *) "glGetProgramiv" );
  77         glGetProgramInfoLog = (PFNGLGETPROGRAMINFOLOGPROC) unx::glXGetProcAddress( (unsigned char *) "glGetProgramInfoLog" );
  78         glUseProgram = (PFNGLUSEPROGRAMPROC) unx::glXGetProcAddress( (unsigned char *) "glUseProgram" );
  79         glDeleteProgram = (PFNGLDELETEPROGRAMPROC) unx::glXGetProcAddress( (unsigned char *) "glDeleteProgram" );
  80         glGetUniformLocation = (PFNGLGETUNIFORMLOCATIONPROC) unx::glXGetProcAddress( (unsigned char *) "glGetUniformLocation" );
  81         glUniform1i = (PFNGLUNIFORM1IPROC) unx::glXGetProcAddress( (unsigned char *) "glUniform1i" );
  82         glUniform1f = (PFNGLUNIFORM1FPROC) unx::glXGetProcAddress( (unsigned char *) "glUniform1f" );
  83         cbInitialized = true;
  84     }
  85
  86     return glCreateShader != NULL;
  87 #else
  88     return false;
  89 #endif
  90 }
  91
  92 GLuint OGLShaders::LinkProgram( const char *vertexShader, const char *fragmentShader )
  93 {
  94 #ifdef GL_VERSION_2_0
  95     if( !Initialize() )
  96         return 0;
  97
  98     GLhandleARB vertexObject, fragmentObject, programObject;
  99     GLint vertexCompiled, fragmentCompiled, programLinked;
 100     char log[1024];
 101
 102     vertexObject = glCreateShader( GL_VERTEX_SHADER );
 103     fragmentObject = glCreateShader( GL_FRAGMENT_SHADER );
 104     OSL_TRACE("checkpoint 1: shaders created (%d) vertex: %d fragment: %d", glGetError() == GL_NO_ERROR, vertexObject, fragmentObject );
 105
 106
 107     glShaderSource( vertexObject, 1, &vertexShader, NULL );
 108     glShaderSource( fragmentObject, 1, &fragmentShader, NULL );
 109
 110     glCompileShader( vertexObject );
 111     glGetShaderInfoLog( vertexObject, sizeof( log ), NULL, log );
 112     OSL_TRACE("vertex compile log: %s", log);
 113     glGetShaderiv( vertexObject, GL_COMPILE_STATUS, &vertexCompiled );
 114     glCompileShader( fragmentObject );
 115     glGetShaderInfoLog( fragmentObject, sizeof( log ), NULL, log );
 116     OSL_TRACE("fragment compile log: %s", log);
 117     glGetShaderiv( fragmentObject, GL_COMPILE_STATUS, &fragmentCompiled );
 118
 119     if( !vertexCompiled || !fragmentCompiled )
 120         return 0;
 121
 122     OSL_TRACE("checkpoint 2: shaders compiled (%d)", glGetError() == GL_NO_ERROR);
 123
 124     programObject = glCreateProgram();
 125     glAttachShader( programObject, vertexObject );
 126     glAttachShader( programObject, fragmentObject );
 127
 128     glLinkProgram( programObject );
 129     glGetProgramInfoLog( programObject, sizeof( log ), NULL, log );
 130     OSL_TRACE("program link log: %s", log);
 131     glGetProgramiv( programObject, GL_LINK_STATUS, &programLinked );
 132
 133     if( !programLinked )
 134         return 0;
 135
 136     OSL_TRACE("checkpoint 3: program linked (%d)", glGetError() == GL_NO_ERROR);
 137
 138     return programObject;
 139 #else
 140     return 0;
 141 #endif
 142 }
 143