On 10/31/2013 08:42 AM, Marek Olšák wrote:
> From: Marek Olšák <marek.ol...@amd.com>
>
> Cc: mesa-sta...@lists.freedesktop.org
This is not correct. GL_COMPRESSED_TEXTURE_FORMATS is only supposed to
return texture formats "suitable for general-purpose usage." Since
GL_COMPRESSED_RGBA_S3TC_DXT1_EXT only has 1 bit for alpha, it's not
suitable for general-purpose usage. As far as I'm aware, nobody else
returns that format either... and I think we have a piglit test.
I just noticed that the most recent version of the spec adds it to the
state tables. I'll file a spec bug.
> ---
> src/mesa/main/texcompress.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/src/mesa/main/texcompress.c b/src/mesa/main/texcompress.c
> index e71d0c4..7393d3f 100644
> --- a/src/mesa/main/texcompress.c
> +++ b/src/mesa/main/texcompress.c
> @@ -257,11 +257,12 @@ _mesa_get_compressed_formats(struct gl_context *ctx,
> GLint *formats)
> if (ctx->Extensions.EXT_texture_compression_s3tc) {
> if (formats) {
> formats[n++] = GL_COMPRESSED_RGB_S3TC_DXT1_EXT;
> + formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
> formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
> formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
> }
> else {
> - n += 3;
> + n += 4;
> }
> }
>
>
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