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vulkan: allow non-bit-exact render target transfers behind an opt-in cvar

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This commit is contained in:
mchughalex 2026-07-24 19:39:33 +01:00
parent 9100b278b7
commit 593f8774f6
1 changed files with 12 additions and 0 deletions
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12
src/graphics/vulkan/render_target_cache.cpp
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@ -56,6 +56,13 @@ REXCVAR_DEFINE_BOOL(vulkan_deferred_resolve_clears, false, "GPU/Vulkan",
"with an attachment clear per resolve")
.lifecycle(rex::cvar::Lifecycle::kHotReload);
REXCVAR_DEFINE_BOOL(vulkan_allow_inexact_rt_transfers, false, "GPU/Vulkan",
"Allow the host render target path on devices lacking integer sampled-image "
"MSAA or UINT transfer format support, degrading render target ownership "
"transfers from bit-exact to approximate (for non-conformant drivers such as "
"Vulkan-on-D3D12, where the fragment shader interlock path is unavailable)")
.lifecycle(rex::cvar::Lifecycle::kInitOnly);
// DEFINE_string(
// render_target_path_vulkan, "",
// "Render target emulation path to use on Vulkan.\n"
@ -429,6 +436,11 @@ bool VulkanRenderTargetCache::Initialize(uint32_t shared_memory_binding_count) {
"can't be bit-exact on this device; switching to fragment shader "
"interlock path for D3D12 parity");
path_ = Path::kPixelShaderInterlock;
} else if (REXCVAR_GET(vulkan_allow_inexact_rt_transfers)) {
REXGPU_WARN(
"VulkanRenderTargetCache: Proceeding with non-bit-exact host render "
"target ownership transfers (vulkan_allow_inexact_rt_transfers); "
"emulated rendering may be inaccurate on this device");
} else {
REXGPU_ERROR(
"VulkanRenderTargetCache: Bit-exact host render target ownership "