static GLint read_buffer_enum_to_index ( GLenum buffer ) [static]

Helper routine used by glReadBuffer. Given a GLenum naming a color buffer, return the index of the corresponding renderbuffer (a BUFFER_* value). return -1 for an invalid buffer.

Definition at line 158 of file buffers.c.

Referenced by _mesa_ReadBuffer().

{
   switch (buffer) {
      case GL_FRONT:
         return BUFFER_FRONT_LEFT;
      case GL_BACK:
         return BUFFER_BACK_LEFT;
      case GL_RIGHT:
         return BUFFER_FRONT_RIGHT;
      case GL_FRONT_RIGHT:
         return BUFFER_FRONT_RIGHT;
      case GL_BACK_RIGHT:
         return BUFFER_BACK_RIGHT;
      case GL_BACK_LEFT:
         return BUFFER_BACK_LEFT;
      case GL_LEFT:
         return BUFFER_FRONT_LEFT;
      case GL_FRONT_LEFT:
         return BUFFER_FRONT_LEFT;
      case GL_AUX0:
         return BUFFER_AUX0;
      case GL_AUX1:
         return BUFFER_AUX1;
      case GL_AUX2:
         return BUFFER_AUX2;
      case GL_AUX3:
         return BUFFER_AUX3;
      case GL_COLOR_ATTACHMENT0_EXT:
         return BUFFER_COLOR0;
      case GL_COLOR_ATTACHMENT1_EXT:
         return BUFFER_COLOR1;
      case GL_COLOR_ATTACHMENT2_EXT:
         return BUFFER_COLOR2;
      case GL_COLOR_ATTACHMENT3_EXT:
         return BUFFER_COLOR3;
      case GL_COLOR_ATTACHMENT4_EXT:
         return BUFFER_COLOR4;
      case GL_COLOR_ATTACHMENT5_EXT:
         return BUFFER_COLOR5;
      case GL_COLOR_ATTACHMENT6_EXT:
         return BUFFER_COLOR6;
      case GL_COLOR_ATTACHMENT7_EXT:
         return BUFFER_COLOR7;
      default:
         /* error */
         return -1;
   }
}

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