Beispiel #1
0
/**
 * Do error checking of the format/type parameters to glReadPixels and
 * glDrawPixels.
 * \param drawing if GL_TRUE do checking for DrawPixels, else do checking
 *                for ReadPixels.
 * \return GL_TRUE if error detected, GL_FALSE if no errors
 */
GLboolean
_mesa_error_check_format_type(GLcontext *ctx, GLenum format, GLenum type,
                              GLboolean drawing)
{
   const char *readDraw = drawing ? "Draw" : "Read";

   if (ctx->Extensions.EXT_packed_depth_stencil
       && type == GL_UNSIGNED_INT_24_8_EXT
       && format != GL_DEPTH_STENCIL_EXT) {
      _mesa_error(ctx, GL_INVALID_OPERATION,
                  "gl%sPixels(format is not GL_DEPTH_STENCIL_EXT)", readDraw);
      return GL_TRUE;
   }

   /* basic combinations test */
   if (!_mesa_is_legal_format_and_type(ctx, format, type)) {
      _mesa_error(ctx, GL_INVALID_ENUM,
                  "gl%sPixels(format or type)", readDraw);
      return GL_TRUE;
   }

   /* additional checks */
   switch (format) {
   case GL_RED:
   case GL_GREEN:
   case GL_BLUE:
   case GL_ALPHA:
   case GL_LUMINANCE:
   case GL_LUMINANCE_ALPHA:
   case GL_RGB:
   case GL_BGR:
   case GL_RGBA:
   case GL_BGRA:
   case GL_ABGR_EXT:
      if (drawing && !ctx->Visual.rgbMode) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                   "glDrawPixels(drawing RGB pixels into color index buffer)");
         return GL_TRUE;
      }
      if (!drawing && !_mesa_dest_buffer_exists(ctx, GL_COLOR)) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glReadPixels(no color buffer)");
         return GL_TRUE;
      }
      break;
   case GL_COLOR_INDEX:
      if (!drawing && ctx->Visual.rgbMode) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                    "glReadPixels(reading color index format from RGB buffer)");
         return GL_TRUE;
      }
      if (!drawing && !_mesa_dest_buffer_exists(ctx, GL_COLOR)) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glReadPixels(no color buffer)");
         return GL_TRUE;
      }
      break;
   case GL_STENCIL_INDEX:
      if ((drawing && !_mesa_dest_buffer_exists(ctx, format)) ||
          (!drawing && !_mesa_source_buffer_exists(ctx, format))) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "gl%sPixels(no stencil buffer)", readDraw);
         return GL_TRUE;
      }
      break;
   case GL_DEPTH_COMPONENT:
      if ((drawing && !_mesa_dest_buffer_exists(ctx, format))) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "gl%sPixels(no depth buffer)", readDraw);
         return GL_TRUE;
      }
      break;
   case GL_DEPTH_STENCIL_EXT:
      if (!ctx->Extensions.EXT_packed_depth_stencil ||
          type != GL_UNSIGNED_INT_24_8_EXT) {
         _mesa_error(ctx, GL_INVALID_ENUM, "gl%sPixels(type)", readDraw);
         return GL_TRUE;
      }
      if ((drawing && !_mesa_dest_buffer_exists(ctx, format)) ||
          (!drawing && !_mesa_source_buffer_exists(ctx, format))) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "gl%sPixels(no depth or stencil buffer)", readDraw);
         return GL_TRUE;
      }
      break;
   default:
      /* this should have been caught in _mesa_is_legal_format_type() */
      _mesa_problem(ctx, "unexpected format in _mesa_%sPixels", readDraw);
      return GL_TRUE;
   }

   /* no errors */
   return GL_FALSE;
}
Beispiel #2
0
/*
 * Execute glDrawPixels
 */
static void GLAPIENTRY
_mesa_DrawPixels( GLsizei width, GLsizei height,
                  GLenum format, GLenum type, const GLvoid *pixels )
{
   GLenum err;
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);

   if (MESA_VERBOSE & VERBOSE_API)
      _mesa_debug(ctx, "glDrawPixels(%d, %d, %s, %s, %p) // to %s at %d, %d\n",
                  width, height,
                  _mesa_lookup_enum_by_nr(format),
                  _mesa_lookup_enum_by_nr(type),
                  pixels,
                  _mesa_lookup_enum_by_nr(ctx->DrawBuffer->ColorDrawBuffer[0]),
                  IROUND(ctx->Current.RasterPos[0]),
                  IROUND(ctx->Current.RasterPos[1]));


   if (width < 0 || height < 0) {
      _mesa_error( ctx, GL_INVALID_VALUE, "glDrawPixels(width or height < 0)" );
      return;
   }

   /* We're not using the current vertex program, and the driver may install
    * its own.  Note: this may dirty some state.
    */
   _mesa_set_vp_override(ctx, GL_TRUE);

   /* Note: this call does state validation */
   if (!_mesa_valid_to_render(ctx, "glDrawPixels")) {
      goto end;      /* the error code was recorded */
   }

   /* GL 3.0 introduced a new restriction on glDrawPixels() over what was in
    * GL_EXT_texture_integer.  From section 3.7.4 ("Rasterization of Pixel
    * Rectangles) on page 151 of the GL 3.0 specification:
    *
    *     "If format contains integer components, as shown in table 3.6, an
    *      INVALID OPERATION error is generated."
    *
    * Since DrawPixels rendering would be merely undefined if not an error (due
    * to a lack of defined mapping from integer data to gl_Color fragment shader
    * input), NVIDIA's implementation also just returns this error despite
    * exposing GL_EXT_texture_integer, just return an error regardless.
    */
   if (_mesa_is_enum_format_integer(format)) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawPixels(integer format)");
      goto end;
   }

   err = _mesa_error_check_format_and_type(ctx, format, type);
   if (err != GL_NO_ERROR) {
      _mesa_error(ctx, err, "glDrawPixels(invalid format %s and/or type %s)",
                  _mesa_lookup_enum_by_nr(format),
                  _mesa_lookup_enum_by_nr(type));
      goto end;
   }

   /* do special format-related checks */
   switch (format) {
   case GL_STENCIL_INDEX:
   case GL_DEPTH_COMPONENT:
   case GL_DEPTH_STENCIL_EXT:
      /* these buffers must exist */
      if (!_mesa_dest_buffer_exists(ctx, format)) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glDrawPixels(missing deest buffer)");
         goto end;
      }
      break;
   case GL_COLOR_INDEX:
      if (ctx->PixelMaps.ItoR.Size == 0 ||
          ctx->PixelMaps.ItoG.Size == 0 ||
          ctx->PixelMaps.ItoB.Size == 0) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                "glDrawPixels(drawing color index pixels into RGB buffer)");
         goto end;
      }
      break;
   default:
      /* for color formats it's not an error if the destination color
       * buffer doesn't exist.
       */
      break;
   }

   if (ctx->RasterDiscard) {
      goto end;
   }

   if (!ctx->Current.RasterPosValid) {
      goto end;  /* no-op, not an error */
   }

   if (ctx->RenderMode == GL_RENDER) {
      if (width > 0 && height > 0) {
         /* Round, to satisfy conformance tests (matches SGI's OpenGL) */
         GLint x = IROUND(ctx->Current.RasterPos[0]);
         GLint y = IROUND(ctx->Current.RasterPos[1]);

         if (_mesa_is_bufferobj(ctx->Unpack.BufferObj)) {
            /* unpack from PBO */
            if (!_mesa_validate_pbo_access(2, &ctx->Unpack, width, height,
                                           1, format, type, INT_MAX, pixels)) {
               _mesa_error(ctx, GL_INVALID_OPERATION,
                           "glDrawPixels(invalid PBO access)");
               goto end;
            }
            if (_mesa_bufferobj_mapped(ctx->Unpack.BufferObj)) {
               /* buffer is mapped - that's an error */
               _mesa_error(ctx, GL_INVALID_OPERATION,
                           "glDrawPixels(PBO is mapped)");
               goto end;
            }
         }

         ctx->Driver.DrawPixels(ctx, x, y, width, height, format, type,
                                &ctx->Unpack, pixels);
      }
   }
   else if (ctx->RenderMode == GL_FEEDBACK) {
      /* Feedback the current raster pos info */
      FLUSH_CURRENT( ctx, 0 );
      _mesa_feedback_token( ctx, (GLfloat) (GLint) GL_DRAW_PIXEL_TOKEN );
      _mesa_feedback_vertex( ctx,
                             ctx->Current.RasterPos,
                             ctx->Current.RasterColor,
                             ctx->Current.RasterTexCoords[0] );
   }
   else {
      ASSERT(ctx->RenderMode == GL_SELECT);
      /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
   }

end:
   _mesa_set_vp_override(ctx, GL_FALSE);

   if (MESA_DEBUG_FLAGS & DEBUG_ALWAYS_FLUSH) {
      _mesa_flush(ctx);
   }
}
Beispiel #3
0
static void GLAPIENTRY
_mesa_CopyPixels( GLint srcx, GLint srcy, GLsizei width, GLsizei height,
                  GLenum type )
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);

   if (MESA_VERBOSE & VERBOSE_API)
      _mesa_debug(ctx,
                  "glCopyPixels(%d, %d, %d, %d, %s) // from %s to %s at %d, %d\n",
                  srcx, srcy, width, height,
                  _mesa_lookup_enum_by_nr(type),
                  _mesa_lookup_enum_by_nr(ctx->ReadBuffer->ColorReadBuffer),
                  _mesa_lookup_enum_by_nr(ctx->DrawBuffer->ColorDrawBuffer[0]),
                  IROUND(ctx->Current.RasterPos[0]),
                  IROUND(ctx->Current.RasterPos[1]));

   if (width < 0 || height < 0) {
      _mesa_error(ctx, GL_INVALID_VALUE, "glCopyPixels(width or height < 0)");
      return;
   }

   /* Note: more detailed 'type' checking is done by the
    * _mesa_source/dest_buffer_exists() calls below.  That's where we
    * check if the stencil buffer exists, etc.
    */
   if (type != GL_COLOR &&
       type != GL_DEPTH &&
       type != GL_STENCIL &&
       type != GL_DEPTH_STENCIL) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glCopyPixels(type=%s)",
                  _mesa_lookup_enum_by_nr(type));
      return;
   }

   /* We're not using the current vertex program, and the driver may install
    * it's own.  Note: this may dirty some state.
    */
   _mesa_set_vp_override(ctx, GL_TRUE);

   /* Note: this call does state validation */
   if (!_mesa_valid_to_render(ctx, "glCopyPixels")) {
      goto end;      /* the error code was recorded */
   }

   /* Check read buffer's status (draw buffer was already checked) */
   if (ctx->ReadBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
      _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
                  "glCopyPixels(incomplete framebuffer)" );
      goto end;
   }

   if (_mesa_is_user_fbo(ctx->ReadBuffer) &&
       ctx->ReadBuffer->Visual.samples > 0) {
      _mesa_error(ctx, GL_INVALID_OPERATION,
		  "glCopyPixels(multisample FBO)");
      goto end;
   }

   if (!_mesa_source_buffer_exists(ctx, type) ||
       !_mesa_dest_buffer_exists(ctx, type)) {
      _mesa_error(ctx, GL_INVALID_OPERATION,
                  "glCopyPixels(missing source or dest buffer)");
      goto end;
   }

   if (ctx->RasterDiscard) {
      goto end;
   }

   if (!ctx->Current.RasterPosValid || width == 0 || height == 0) {
      goto end; /* no-op, not an error */
   }

   if (ctx->RenderMode == GL_RENDER) {
      /* Round to satisfy conformance tests (matches SGI's OpenGL) */
      if (width > 0 && height > 0) {
         GLint destx = IROUND(ctx->Current.RasterPos[0]);
         GLint desty = IROUND(ctx->Current.RasterPos[1]);
         ctx->Driver.CopyPixels( ctx, srcx, srcy, width, height, destx, desty,
                                 type );
      }
   }
   else if (ctx->RenderMode == GL_FEEDBACK) {
      FLUSH_CURRENT( ctx, 0 );
      _mesa_feedback_token( ctx, (GLfloat) (GLint) GL_COPY_PIXEL_TOKEN );
      _mesa_feedback_vertex( ctx, 
                             ctx->Current.RasterPos,
                             ctx->Current.RasterColor,
                             ctx->Current.RasterTexCoords[0] );
   }
   else {
      ASSERT(ctx->RenderMode == GL_SELECT);
      /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
   }

end:
   _mesa_set_vp_override(ctx, GL_FALSE);

   if (MESA_DEBUG_FLAGS & DEBUG_ALWAYS_FLUSH) {
      _mesa_flush(ctx);
   }
}
Beispiel #4
0
static void GLAPIENTRY
_mesa_CopyPixels( GLint srcx, GLint srcy, GLsizei width, GLsizei height,
                  GLenum type )
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);

   if (width < 0 || height < 0) {
      _mesa_error(ctx, GL_INVALID_VALUE, "glCopyPixels(width or height < 0)");
      return;
   }

   /* Note: more detailed 'type' checking is done by the
    * _mesa_source/dest_buffer_exists() calls below.  That's where we
    * check if the stencil buffer exists, etc.
    */
   if (type != GL_COLOR &&
       type != GL_DEPTH &&
       type != GL_STENCIL &&
       type != GL_DEPTH_STENCIL) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glCopyPixels(type=%s)",
                  _mesa_lookup_enum_by_nr(type));
      return;
   }

   /* We're not using the current vertex program, and the driver may install
    * it's own.
    */
   _mesa_set_vp_override(ctx, GL_TRUE);

   if (ctx->NewState) {
      _mesa_update_state(ctx);
   }

   if (!valid_fragment_program(ctx)) {
      _mesa_error(ctx, GL_INVALID_OPERATION,
                  "glCopyPixels (invalid fragment program)");
      goto end;
   }

   if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT ||
       ctx->ReadBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
      _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
                  "glCopyPixels(incomplete framebuffer)" );
      goto end;
   }

   if (!_mesa_source_buffer_exists(ctx, type) ||
       !_mesa_dest_buffer_exists(ctx, type)) {
      _mesa_error(ctx, GL_INVALID_OPERATION,
                  "glCopyPixels(missing source or dest buffer)");
      goto end;
   }

   if (!ctx->Current.RasterPosValid || width ==0 || height == 0) {
      goto end; /* no-op, not an error */
   }

   if (ctx->RenderMode == GL_RENDER) {
      /* Round to satisfy conformance tests (matches SGI's OpenGL) */
      if (width > 0 && height > 0) {
         GLint destx = IROUND(ctx->Current.RasterPos[0]);
         GLint desty = IROUND(ctx->Current.RasterPos[1]);
         ctx->Driver.CopyPixels( ctx, srcx, srcy, width, height, destx, desty,
                                 type );
      }
   }
   else if (ctx->RenderMode == GL_FEEDBACK) {
      FLUSH_CURRENT( ctx, 0 );
      _mesa_feedback_token( ctx, (GLfloat) (GLint) GL_COPY_PIXEL_TOKEN );
      _mesa_feedback_vertex( ctx, 
                             ctx->Current.RasterPos,
                             ctx->Current.RasterColor,
                             ctx->Current.RasterIndex,
                             ctx->Current.RasterTexCoords[0] );
   }
   else {
      ASSERT(ctx->RenderMode == GL_SELECT);
      /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
   }

end:
   _mesa_set_vp_override(ctx, GL_FALSE);
}
Beispiel #5
0
/**
 * Do error checking of the format/type parameters to glReadPixels and
 * glDrawPixels.
 * \param drawing if GL_TRUE do checking for DrawPixels, else do checking
 *                for ReadPixels.
 * \return GL_TRUE if error detected, GL_FALSE if no errors
 */
GLboolean
_mesa_error_check_format_type(struct gl_context *ctx, GLenum format,
                              GLenum type, GLboolean drawing)
{
   const char *readDraw = drawing ? "Draw" : "Read";
   const GLboolean reading = !drawing;

   /* state validation should have already been done */
   ASSERT(ctx->NewState == 0x0);

   if (ctx->Extensions.EXT_packed_depth_stencil
       && type == GL_UNSIGNED_INT_24_8_EXT
       && format != GL_DEPTH_STENCIL_EXT) {
      _mesa_error(ctx, GL_INVALID_OPERATION,
                  "gl%sPixels(format is not GL_DEPTH_STENCIL_EXT)", readDraw);
      return GL_TRUE;
   }

   if (ctx->Extensions.ARB_depth_buffer_float
       && type == GL_FLOAT_32_UNSIGNED_INT_24_8_REV
       && format != GL_DEPTH_STENCIL_EXT) {
      _mesa_error(ctx, GL_INVALID_OPERATION,
                  "gl%sPixels(format is not GL_DEPTH_STENCIL_EXT)", readDraw);
      return GL_TRUE;
   }

   /* basic combinations test */
   if (!_mesa_is_legal_format_and_type(ctx, format, type)) {
      _mesa_error(ctx, GL_INVALID_ENUM,
                  "gl%sPixels(format or type)", readDraw);
      return GL_TRUE;
   }

   /* additional checks */
   switch (format) {
   case GL_RG:
   case GL_RED:
   case GL_GREEN:
   case GL_BLUE:
   case GL_ALPHA:
   case GL_LUMINANCE:
   case GL_LUMINANCE_ALPHA:
   case GL_RGB:
   case GL_BGR:
   case GL_RGBA:
   case GL_BGRA:
   case GL_ABGR_EXT:
   case GL_RED_INTEGER_EXT:
   case GL_GREEN_INTEGER_EXT:
   case GL_BLUE_INTEGER_EXT:
   case GL_ALPHA_INTEGER_EXT:
   case GL_RGB_INTEGER_EXT:
   case GL_RGBA_INTEGER_EXT:
   case GL_BGR_INTEGER_EXT:
   case GL_BGRA_INTEGER_EXT:
   case GL_LUMINANCE_INTEGER_EXT:
   case GL_LUMINANCE_ALPHA_INTEGER_EXT:
      if (!drawing) {
         /* reading */
         if (!_mesa_source_buffer_exists(ctx, GL_COLOR)) {
            _mesa_error(ctx, GL_INVALID_OPERATION,
                        "glReadPixels(no color buffer)");
            return GL_TRUE;
         }
      }
      break;
   case GL_COLOR_INDEX:
      if (drawing) {
         if (ctx->PixelMaps.ItoR.Size == 0 ||
	     ctx->PixelMaps.ItoG.Size == 0 ||
	     ctx->PixelMaps.ItoB.Size == 0) {
            _mesa_error(ctx, GL_INVALID_OPERATION,
                   "glDrawPixels(drawing color index pixels into RGB buffer)");
            return GL_TRUE;
         }
      }
      else {
         /* reading */
         if (!_mesa_source_buffer_exists(ctx, GL_COLOR)) {
            _mesa_error(ctx, GL_INVALID_OPERATION,
                        "glReadPixels(no color buffer)");
            return GL_TRUE;
         }
         /* We no longer support CI-mode color buffers so trying to read
          * GL_COLOR_INDEX pixels is always an error.
          */
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glReadPixels(color buffer is RGB)");
         return GL_TRUE;
      }
      break;
   case GL_STENCIL_INDEX:
      if ((drawing && !_mesa_dest_buffer_exists(ctx, format)) ||
          (reading && !_mesa_source_buffer_exists(ctx, format))) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "gl%sPixels(no stencil buffer)", readDraw);
         return GL_TRUE;
      }
      break;
   case GL_DEPTH_COMPONENT:
      if ((drawing && !_mesa_dest_buffer_exists(ctx, format))) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "gl%sPixels(no depth buffer)", readDraw);
         return GL_TRUE;
      }
      break;
   case GL_DEPTH_STENCIL_EXT:
      /* Check validity of the type first. */
      switch (type) {
         case GL_UNSIGNED_INT_24_8_EXT:
            if (!ctx->Extensions.EXT_packed_depth_stencil) {
               _mesa_error(ctx, GL_INVALID_ENUM, "gl%sPixels(type)", readDraw);
               return GL_TRUE;
            }
            break;
         case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
            if (!ctx->Extensions.ARB_depth_buffer_float) {
               _mesa_error(ctx, GL_INVALID_ENUM, "gl%sPixels(type)", readDraw);
               return GL_TRUE;
            }
            break;
         default:
            _mesa_error(ctx, GL_INVALID_ENUM, "gl%sPixels(type)", readDraw);
            return GL_TRUE;
      }
      if ((drawing && !_mesa_dest_buffer_exists(ctx, format)) ||
          (reading && !_mesa_source_buffer_exists(ctx, format))) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "gl%sPixels(no depth or stencil buffer)", readDraw);
         return GL_TRUE;
      }
      break;
   default:
      /* this should have been caught in _mesa_is_legal_format_type() */
      _mesa_problem(ctx, "unexpected format in _mesa_%sPixels", readDraw);
      return GL_TRUE;
   }

   /* no errors */
   return GL_FALSE;
}
Beispiel #6
0
void GLAPIENTRY
_mesa_CopyPixels( GLint srcx, GLint srcy, GLsizei width, GLsizei height,
                  GLenum type )
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);

   if (ctx->NewState) {
      _mesa_update_state(ctx);
   }

   if (ctx->FragmentProgram.Enabled && !ctx->FragmentProgram._Enabled) {
      _mesa_error(ctx, GL_INVALID_OPERATION,
                  "glCopyPixels (invalid fragment program)");
      return;
   }

   if (width < 0 || height < 0) {
      _mesa_error(ctx, GL_INVALID_VALUE, "glCopyPixels(width or height < 0)");
      return;
   }

   if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT ||
       ctx->ReadBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
      _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
                  "glCopyPixels(incomplete framebuffer)" );
      return;
   }

   if (!_mesa_source_buffer_exists(ctx, type) ||
       !_mesa_dest_buffer_exists(ctx, type)) {
      _mesa_error(ctx, GL_INVALID_OPERATION,
                  "glCopyPixels(missing source or dest buffer)");
      return;
   }

   if (!ctx->Current.RasterPosValid) {
      return;
   }

   if (ctx->RenderMode == GL_RENDER) {
      /* Round to satisfy conformance tests (matches SGI's OpenGL) */
      GLint destx = IROUND(ctx->Current.RasterPos[0]);
      GLint desty = IROUND(ctx->Current.RasterPos[1]);
      ctx->Driver.CopyPixels( ctx, srcx, srcy, width, height, destx, desty,
			      type );
   }
   else if (ctx->RenderMode == GL_FEEDBACK) {
      FLUSH_CURRENT( ctx, 0 );
      FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_COPY_PIXEL_TOKEN );
      _mesa_feedback_vertex( ctx, 
                             ctx->Current.RasterPos,
                             ctx->Current.RasterColor,
                             ctx->Current.RasterIndex,
                             ctx->Current.RasterTexCoords[0] );
   }
   else {
      ASSERT(ctx->RenderMode == GL_SELECT);
      /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
   }
}