Mesa (main): d3d12: When no framebuffer attachments are present, use ForcedSampleCount instead of SampleDesc.Count for MSAA

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Module: Mesa
Branch: main
Commit: 3f22038973b36416cbe5db8c1803db99980351da
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=3f22038973b36416cbe5db8c1803db99980351da

Author: Jesse Natalie <jenatali at microsoft.com>
Date:   Tue Jan 11 13:38:04 2022 -0800

d3d12: When no framebuffer attachments are present, use ForcedSampleCount instead of SampleDesc.Count for MSAA

Reviewed-by: Boris Brezillon <boris.brezillon at collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14504>

---

 src/gallium/drivers/d3d12/d3d12_pipeline_state.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/gallium/drivers/d3d12/d3d12_pipeline_state.cpp b/src/gallium/drivers/d3d12/d3d12_pipeline_state.cpp
index f236f8b2fab..cff25192a47 100644
--- a/src/gallium/drivers/d3d12/d3d12_pipeline_state.cpp
+++ b/src/gallium/drivers/d3d12/d3d12_pipeline_state.cpp
@@ -261,7 +261,12 @@ create_gfx_pipeline_state(struct d3d12_context *ctx)
       pso_desc.RTVFormats[i] = d3d12_rtv_format(ctx, i);
    pso_desc.DSVFormat = state->dsv_format;
 
-   pso_desc.SampleDesc.Count = state->samples;
+   if (state->num_cbufs || state->dsv_format != DXGI_FORMAT_UNKNOWN) {
+      pso_desc.SampleDesc.Count = state->samples;
+   } else {
+      pso_desc.SampleDesc.Count = 1;
+      pso_desc.RasterizerState.ForcedSampleCount = state->samples;
+   }
    pso_desc.SampleDesc.Quality = 0;
 
    pso_desc.NodeMask = 0;