- 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_source_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;