From 88dc24663079d3b7ae62a953a770887dc0b709da Mon Sep 17 00:00:00 2001 From: Chris Forbes Date: Fri, 29 Nov 2013 21:44:13 +1300 Subject: [PATCH] mesa: Require per-sample shading if the `sample` qualifier is used. Signed-off-by: Chris Forbes Reviewed-by: Francisco Jerez --- src/mesa/program/program.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/src/mesa/program/program.c b/src/mesa/program/program.c index 01f8c6f1147..cdf1c03fa91 100644 --- a/src/mesa/program/program.c +++ b/src/mesa/program/program.c @@ -1049,6 +1049,14 @@ _mesa_get_min_invocations_per_fragment(struct gl_context *ctx, * has no effect." */ if (ctx->Multisample.Enabled) { + /* The ARB_gpu_shader5 specification says: + * + * "Use of the "sample" qualifier on a fragment shader input + * forces per-sample shading" + */ + if (prog->IsSample) + return MAX2(ctx->DrawBuffer->Visual.samples, 1); + if (prog->Base.SystemValuesRead & (SYSTEM_BIT_SAMPLE_ID | SYSTEM_BIT_SAMPLE_POS)) return MAX2(ctx->DrawBuffer->Visual.samples, 1); -- 2.30.2