Ian Romanick <i...@freedesktop.org> writes: > From: Ian Romanick <ian.d.roman...@intel.com> > > The OpenGL 3.2 core profile spec says: > > "The following base internal formats from table 3.11 are > color-renderable: RED, RG, RGB, and RGBA. The sized internal formats > from table 3.12 that have a color-renderable base internal format > are also color-renderable. No other formats, including compressed > internal formats, are color-renderable." > > The OpenGL 3.2 compatibility profile spec says (only ALPHA is added): > > "The following base internal formats from table 3.16 are > color-renderable: ALPHA, RED, RG, RGB, and RGBA. The sized internal > formats > from table 3.17 that have a color-renderable base internal format > are also color-renderable. No other formats, including compressed > internal formats, are color-renderable." > > Table 3.12 in the core profile spec and table 3.17 in the compatibility > profile spec list SNORM formats as having a base internal format of RED, > RG, RGB, or RGBA. From this we infer that they should also be color > renderable.
This sounds sort of like the description of the bottom half of the change, to remove L/LA/I snorm formats. (ALPHA being left in place, which I missed at first). I wonder, do they also not support FBOs with unorm L/LA/I, despite ARB_framebuffer_object? fbo-clear-formats should tell. I'd be happy to see those go if nobody else supports them either, and it would make this change make more sense to me. > The OpenGL ES 3.0 spec says: > > "An internal format is color-renderable if it is one of the formats > from table 3.12 noted as color-renderable or if it is unsized format > RGBA or RGB. No other formats, including compressed internal > formats, are color-renderable." > > In the OpenGL ES 3.0 spec, none of the SNORM formats have "color- > renderable" marked in table 3.12. The RGB I and UI formats also are not > color-renderable in ES3, but we'll save that change for another patch. > > As a data point, NVIDIA's closed-source driver (version 304.64) rejects > *all* SNORM formats for renderbuffers in an OpenGL 4.x compatibility > profile. This sounds like the description of the top half of the change, and this half if pulled out would get my r-b.
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