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On 07/28/2011 08:54 AM, Brian Paul wrote:
> When we do a glReadPixels into the temporary buffer, we don't want to
> use GL_LUMINANCE, GL_LUMINANCE_ALPHA or GL_INTENSITY since they will
> compute L=R+G+B which is not what we want.
>
> This bug has existed all along but was only exposed by the elimination
> of the driver hook for glCopyTexImage() in
> 5874890c26f434f54e9218b83fae4eb8175c24e9.
>
> Fixes https://bugs.freedesktop.org/show_bug.cgi?id=39604
Tested-by: Ian Romanick <ian.d.roman...@intel.com>
> ---
> src/mesa/drivers/common/meta.c | 10 ++++++++++
> 1 files changed, 10 insertions(+), 0 deletions(-)
>
> diff --git a/src/mesa/drivers/common/meta.c b/src/mesa/drivers/common/meta.c
> index 26c8951..f9b4755 100644
> --- a/src/mesa/drivers/common/meta.c
> +++ b/src/mesa/drivers/common/meta.c
> @@ -2869,6 +2869,16 @@ copy_tex_sub_image(struct gl_context *ctx,
>
> /* Choose format/type for temporary image buffer */
> format = _mesa_get_format_base_format(texImage->TexFormat);
> + if (format == GL_LUMINANCE ||
> + format == GL_LUMINANCE_ALPHA ||
> + format == GL_INTENSITY) {
> + /* We don't want to use GL_LUMINANCE, GL_INTENSITY, etc. for the
> + * temp image buffer because glReadPixels will do L=R+G+B which is
> + * not what we want (should be L=R).
> + */
> + format = GL_RGBA;
> + }
> +
> type = get_temp_image_type(ctx, format);
> bpp = _mesa_bytes_per_pixel(format, type);
> if (bpp <= 0) {
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