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Check for vertexAttributeInstanceRateZeroDivisor feature before usage

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Check for `vertexAttributeInstanceRateZeroDivisor` in `VkPhysicalDeviceVertexAttributeDivisorFeaturesEXT` when the Maxwell3D register corresponding to the vertex attribute divisor is set to 0. If it isn't then it logs a warning and sets the value anyway which could result in UB since the only alternative is an exception that stops emulation which might not be optimal if the game mostly works fine without this, we will add a user-facing warning when we intentionally allow UB like this in the future.
This commit is contained in:
PixelyIon 2021-11-16 13:53:28 +05:30
parent c3895a8197
commit 841ee9fc15
3 changed files with 6 additions and 2 deletions
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2
app/src/main/cpp/skyline/gpu/interconnect/graphics_context.h
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@ -795,6 +795,8 @@ namespace skyline::gpu::interconnect {
void SetVertexBufferDivisor(u32 index, u32 divisor) {
if (!gpu.quirks.supportsVertexAttributeDivisor)
Logger::Warn("Cannot set vertex attribute divisor without host GPU support");
else if (divisor == 0 && !gpu.quirks.supportsVertexAttributeZeroDivisor)
Logger::Warn("Cannot set vertex attribute divisor to zero without host GPU support");
vertexBindingDivisors[index].divisor = divisor;
}
};

3
app/src/main/cpp/skyline/gpu/quirk_manager.cpp
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@ -39,11 +39,12 @@ namespace skyline {
}
FEAT_SET(vk::PhysicalDeviceFeatures2, features.logicOp, supportsLogicOp)
FEAT_SET(vk::PhysicalDeviceVertexAttributeDivisorFeaturesEXT, vertexAttributeInstanceRateZeroDivisor, supportsVertexAttributeZeroDivisor)
#undef FEAT_SET
}
std::string QuirkManager::Summary() {
return fmt::format("\n* Supports Last Provoking Vertex: {}\n* Supports Logical Operations: {}\n* Supports Vertex Attribute Divisor: {}", supportsLastProvokingVertex, supportsLogicOp, supportsVertexAttributeDivisor);
return fmt::format("\n* Supports Last Provoking Vertex: {}\n* Supports Logical Operations: {}\n* Supports Vertex Attribute Divisor: {}\n* Supports Vertex Attribute Zero Divisor: {}", supportsLastProvokingVertex, supportsLogicOp, supportsVertexAttributeDivisor, supportsVertexAttributeZeroDivisor);
}
}

1
app/src/main/cpp/skyline/gpu/quirk_manager.h
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@ -15,6 +15,7 @@ namespace skyline {
bool supportsLastProvokingVertex{}; //!< If the device supports setting the last vertex as the provoking vertex (with VK_EXT_provoking_vertex)
bool supportsLogicOp{}; //!< If the device supports framebuffer logical operations during blending
bool supportsVertexAttributeDivisor{}; //!< If the device supports a divisor for instance-rate vertex attributes (with VK_EXT_vertex_attribute_divisor)
bool supportsVertexAttributeZeroDivisor{}; //!< If the device supports a zero divisor for instance-rate vertex attributes (with VK_EXT_vertex_attribute_divisor)
QuirkManager() = default;