Function Init

test/browser/test_sdl_gl_mapbuffers.c:52–101

}

int Init ()
{
   GLbyte vShaderStr[] =
      "attribute vec4 vPosition;    \n"
      "void main()                  \n"
      "{                            \n"
      "   gl_Position = vPosition;  \n"
      "}                            \n";

   GLbyte fShaderStr[] =
      "precision mediump float;\n"\
      "void main()                                  \n"
      "{                                            \n"
      "  gl_FragColor = vec4 ( 0.0, 0.0, 1.0, 1.0 );\n"
      "}                                            \n";

   GLuint vertexShader;
   GLuint fragmentShader;
   GLint linked;

   vertexShader = LoadShader ( GL_VERTEX_SHADER, (const char *)vShaderStr );
   fragmentShader = LoadShader ( GL_FRAGMENT_SHADER, (const char *)fShaderStr );

   programObject = glCreateProgram ( );
   if ( programObject == 0 )
      return 0;

   glAttachShader ( programObject, vertexShader );
   glAttachShader ( programObject, fragmentShader );
   glBindAttribLocation ( programObject, 0, "vPosition" );
   glLinkProgram ( programObject );
   glGetProgramiv ( programObject, GL_LINK_STATUS, &linked );
   if ( !linked )
   {
      GLint infoLen = 0;
      glGetProgramiv ( programObject, GL_INFO_LOG_LENGTH, &infoLen );
      if ( infoLen > 1 )
      {
         char* infoLog = malloc (sizeof(char) * infoLen );
         glGetProgramInfoLog ( programObject, infoLen, NULL, infoLog );
         printf ( "Error linking program:\n%s\n", infoLog );
         free ( infoLog );
      }
      glDeleteProgram ( programObject );
      return GL_FALSE;
   }

   glClearColor ( 0.0f, 0.0f, 0.0f, 0.0f );
   return GL_TRUE;
}

static const int kNegativeTest = 0;
static const int kPositiveTest = 1;