From b37b35a5d265adde971265f4e594298a172d0d45 Mon Sep 17 00:00:00 2001 From: "Juan A. Suarez Romero" Date: Thu, 12 Apr 2018 15:56:48 +0000 Subject: [PATCH] getteximage: assume texture image is empty for non defined levels Current code is returning an INVALID_OPERATION when trying to use getTextureImage() on a level that has not been explicitly defined. That is, we define a mipmapped Texture2D with 3 levels, and try to use GetTextureImage() for the 4th levels, and INVALID_OPERATION is returned. Nevertheless, such case is not listed as an error in OpenGL 4.6 spec, section 8.11.4 ("Texture Image Queries"), where all the case errors for this function are defined. So it seems this is a valid operation. On the other hand, in section 8.22 ("Texture State and Proxy State") it states: "Each initial texture image is null. It has zero width, height, and depth, internal format RGBA, or R8 for buffer textures, component sizes set to zero and component types set to NONE, the compressed flag set to FALSE, a zero compressed size, and the bound buffer object name is zero." We can assume that we are reading this initialized empty image when calling GetTextureImage() with a non defined level. With this assumption, we will reach one of the other error cases defined for the functions. In the end this means that we would end up returning INVALID_VALUE to the caller. This fixes arb_get_texture_sub_image piglit tests. v2: just return INVALID_VALUE if there is no defined level (Iago) Signed-off-by: Juan A. Suarez Romero Reviewed-by: Iago Toral Quiroga --- src/mesa/main/texgetimage.c | 27 +++++++++++++++++++++++++-- 1 file changed, 25 insertions(+), 2 deletions(-) diff --git a/src/mesa/main/texgetimage.c b/src/mesa/main/texgetimage.c index 85d0ffd4770..69521c5dd05 100644 --- a/src/mesa/main/texgetimage.c +++ b/src/mesa/main/texgetimage.c @@ -1004,8 +1004,31 @@ dimensions_error_check(struct gl_context *ctx, texImage = select_tex_image(texObj, target, level, zoffset); if (!texImage) { - /* missing texture image */ - _mesa_error(ctx, GL_INVALID_OPERATION, "%s(missing image)", caller); + /* Trying to return a non-defined level is a valid operation per se, as + * OpenGL 4.6 spec, section 8.11.4 ("Texture Image Queries") does not + * handle this case as an error. + * + * Rather, we need to look at section 8.22 ("Texture State and Proxy + * State"): + * + * "Each initial texture image is null. It has zero width, height, and + * depth, internal format RGBA, or R8 for buffer textures, component + * sizes set to zero and component types set to NONE, the compressed + * flag set to FALSE, a zero compressed size, and the bound buffer + * object name is zero." + * + * This means we need to assume the image for the non-defined level is + * an empty image. With this assumption, we can go back to section + * 8.11.4 and checking again the errors: + * + * "An INVALID_VALUE error is generated if xoffset + width is greater + * than the texture’s width, yoffset + height is greater than the + * texture’s height, or zoffset + depth is greater than the texture’s + * depth." + * + * Thus why we return INVALID_VALUE. + */ + _mesa_error(ctx, GL_INVALID_VALUE, "%s(missing image)", caller); return true; }