From a01872f80880c1b928817d84834b7259d073b367 Mon Sep 17 00:00:00 2001 From: Brian Paul Date: Thu, 15 Sep 2016 15:13:07 -0600 Subject: [PATCH] st/mesa: only enable MSAA coverage options when we have a MSAA buffer MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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. ETQW is a game that enables GL_SAMPLE_ALPHA_TO_COVERAGE without MSAA. Shrubs along the side of roads were invisible because fragments with alpha < 0.5 were being discarded (zero coverage). v2: remove ctx->DrawBuffer != NULL check. Reviewed-by: Roland Scheidegger Reviewed-by: Marek Olšák --- src/mesa/state_tracker/st_atom_blend.c | 8 +++++--- src/mesa/state_tracker/st_context.c | 3 ++- 2 files changed, 7 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..76d6a644 100644 --- a/src/mesa/state_tracker/st_atom_blend.c +++ b/src/mesa/state_tracker/st_atom_blend.c @@ -265,9 +265,11 @@ 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->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 | -- 2.7.4