+ /* 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;