From f5d0ced242abc9e4e777bbe374585f44399b75af Mon Sep 17 00:00:00 2001 From: Brian Paul Date: Thu, 8 Mar 2012 20:16:00 -0700 Subject: [PATCH] mesa: fix GL_LUMINANCE handling in glGetTexImage MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit There are several cases in which we need to explicity "rebase" colors (ex: set G=B=0) when getting GL_LUMINANCE textures: 1. If the luminance texture is actually stored as rgba 2. If getting a luminance texture, but returning rgba 3. If getting an rgba texture, but returning luminance Fixes https://bugs.freedesktop.org/show_bug.cgi?id=46679 Also fixes the new piglit getteximage-luminance test. Reviewed-by: José Fonseca --- src/mesa/main/texgetimage.c | 30 ++++++++++++++++++++++++++++-- 1 file changed, 28 insertions(+), 2 deletions(-) diff --git a/src/mesa/main/texgetimage.c b/src/mesa/main/texgetimage.c index 44a828a..05b052a 100644 --- a/src/mesa/main/texgetimage.c +++ b/src/mesa/main/texgetimage.c @@ -298,6 +298,8 @@ get_tex_rgba_uncompressed(struct gl_context *ctx, GLuint dimensions, const gl_format texFormat = _mesa_get_srgb_format_linear(texImage->TexFormat); const GLuint width = texImage->Width; + const GLenum destBaseFormat = _mesa_base_tex_format(ctx, format); + GLenum rebaseFormat = GL_NONE; GLuint height = texImage->Height; GLuint depth = texImage->Depth; GLuint img, row; @@ -318,6 +320,28 @@ get_tex_rgba_uncompressed(struct gl_context *ctx, GLuint dimensions, height = 1; } + if (texImage->_BaseFormat == GL_LUMINANCE || + texImage->_BaseFormat == GL_INTENSITY || + texImage->_BaseFormat == GL_LUMINANCE_ALPHA) { + /* If a luminance (or intensity) texture is read back as RGB(A), the + * returned value should be (L,0,0,1), not (L,L,L,1). Set rebaseFormat + * here to get G=B=0. + */ + rebaseFormat = texImage->_BaseFormat; + } + else if ((texImage->_BaseFormat == GL_RGBA || + texImage->_BaseFormat == GL_RGB) && + (destBaseFormat == GL_LUMINANCE || + destBaseFormat == GL_LUMINANCE_ALPHA || + destBaseFormat == GL_LUMINANCE_INTEGER_EXT || + destBaseFormat == GL_LUMINANCE_ALPHA_INTEGER_EXT)) { + /* If we're reading back an RGB(A) texture as luminance then we need + * to return L=tex(R). Note, that's different from glReadPixels which + * returns L=R+G+B. + */ + rebaseFormat = GL_LUMINANCE_ALPHA; /* this covers GL_LUMINANCE too */ + } + for (img = 0; img < depth; img++) { GLubyte *srcMap; GLint rowstride; @@ -335,12 +359,14 @@ get_tex_rgba_uncompressed(struct gl_context *ctx, GLuint dimensions, if (is_integer) { _mesa_unpack_uint_rgba_row(texFormat, width, src, rgba_uint); - _mesa_rebase_rgba_uint(width, rgba_uint, texImage->_BaseFormat); + if (rebaseFormat) + _mesa_rebase_rgba_uint(width, rgba_uint, rebaseFormat); _mesa_pack_rgba_span_int(ctx, width, rgba_uint, format, type, dest); } else { _mesa_unpack_rgba_row(texFormat, width, src, rgba); - _mesa_rebase_rgba_float(width, rgba, texImage->_BaseFormat); + if (rebaseFormat) + _mesa_rebase_rgba_float(width, rgba, rebaseFormat); _mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) rgba, format, type, dest, &ctx->Pack, transferOps); -- 2.7.4