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[Vulkan] Select back-face stencil ref/mask when culling only front faces

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They were picked whenever front faces were culled, even with both faces culled. Matches D3D12.

Co-authored-by: Herman S. <429230+has207@users.noreply.github.com>
This commit is contained in:
goldislead
2026-08-07 20:12:00 -07:00
committed by Radosław Gliński
parent 53061c63fe
commit 77597d62ae
1 changed files with 2 additions and 1 deletions
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3
src/xenia/gpu/vulkan/vulkan_command_processor.cc
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@@ -4712,8 +4712,9 @@ void VulkanCommandProcessor::UpdateDynamicState(
stencil_ref_mask_back_reg = XE_GPU_REG_RB_STENCILREFMASK_BF;
} else {
// Choose the back face values only if drawing only back faces.
auto pa_su_sc_mode_cntl = regs.Get<reg::PA_SU_SC_MODE_CNTL>();
stencil_ref_mask_front_reg =
regs.Get<reg::PA_SU_SC_MODE_CNTL>().cull_front
(pa_su_sc_mode_cntl.cull_front && !pa_su_sc_mode_cntl.cull_back)
? XE_GPU_REG_RB_STENCILREFMASK_BF
: XE_GPU_REG_RB_STENCILREFMASK;
stencil_ref_mask_back_reg = stencil_ref_mask_front_reg;