Am 15.09.2016 um 23:20 schrieb Brian Paul:
> Regardless of whether GL_MULTISAMPLE is enabled (it's enabled by default)
> we should not set the alpha_to_coverage or alpha_to_one flags if the
> current drawing buffer does not do MSAA.
>
> This fixes the new piglit gl-1.3-alpha_to_coverage_nop test.
> ---
> src/mesa/state_tracker/st_atom_blend.c | 9 ++++++---
> src/mesa/state_tracker/st_context.c | 3 ++-
> 2 files changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/src/mesa/state_tracker/st_atom_blend.c
> b/src/mesa/state_tracker/st_atom_blend.c
> index 65de67b..222267e 100644
> --- a/src/mesa/state_tracker/st_atom_blend.c
> +++ b/src/mesa/state_tracker/st_atom_blend.c
> @@ -265,9 +265,12 @@ update_blend( struct st_context *st )
>
> blend->dither = ctx->Color.DitherFlag;
>
> - if (ctx->Multisample.Enabled) {
> - /* unlike in gallium/d3d10 these operations are only performed
> - if msaa is enabled */
> + if (ctx->Multisample.Enabled &&
> + ctx->DrawBuffer &&
> + ctx->DrawBuffer->Visual.sampleBuffers > 0) {
> + /* Unlike in gallium/d3d10 these operations are only performed
> + * if both msaa is enabled and we have a multisample buffer.
> + */
> blend->alpha_to_coverage = ctx->Multisample.SampleAlphaToCoverage;
> blend->alpha_to_one = ctx->Multisample.SampleAlphaToOne;
> }
> diff --git a/src/mesa/state_tracker/st_context.c
> b/src/mesa/state_tracker/st_context.c
> index ddc11a4..81b3387 100644
> --- a/src/mesa/state_tracker/st_context.c
> +++ b/src/mesa/state_tracker/st_context.c
> @@ -166,7 +166,8 @@ void st_invalidate_state(struct gl_context * ctx,
> GLbitfield new_state)
> struct st_context *st = st_context(ctx);
>
> if (new_state & _NEW_BUFFERS) {
> - st->dirty |= ST_NEW_DSA |
> + st->dirty |= ST_NEW_BLEND |
> + ST_NEW_DSA |
> ST_NEW_FB_STATE |
> ST_NEW_SAMPLE_MASK |
> ST_NEW_SAMPLE_SHADING |
>
Looks reasonable to me.
Reviewed-by: Roland Scheidegger <srol...@vmware.com>
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