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vk_shader_decompiler: Fix vertex id and instance id 

Vulkan's VertexIndex and InstanceIndex don't match with hardware. This
is because Nvidia implements gl_VertexID and gl_InstanceID. The math
that relates these is:

gl_VertexIndex = gl_BaseVertex + gl_VertexID
gl_InstanceIndex = gl_InstanceIndex + gl_InstanceID

To emulate it using what Vulkan's SPIR-V offers (the *Index variants)
this commit substracts gl_Base* from gl_*Index to obtain the OpenGL and
hardware's equivalent.
This commit is contained in:
ReinUsesLisp 2020-02-13 20:25:28 -03:00
parent 8b9a56033a
commit cbea8c74de
1 changed files with 13 additions and 4 deletions
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17
src/video_core/renderer_vulkan/vk_shader_decompiler.cpp
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@ -275,12 +275,14 @@ public:
AddCapability(spv::Capability::ImageGatherExtended);
AddCapability(spv::Capability::SampledBuffer);
AddCapability(spv::Capability::StorageImageWriteWithoutFormat);
AddCapability(spv::Capability::DrawParameters);
AddCapability(spv::Capability::SubgroupBallotKHR);
AddCapability(spv::Capability::SubgroupVoteKHR);
AddExtension("SPV_KHR_shader_ballot");
AddExtension("SPV_KHR_subgroup_vote");
AddExtension("SPV_KHR_storage_buffer_storage_class");
AddExtension("SPV_KHR_variable_pointers");
AddExtension("SPV_KHR_shader_draw_parameters");
if (ir.UsesViewportIndex()) {
AddCapability(spv::Capability::MultiViewport);
@ -492,9 +494,11 @@ private:
interfaces.push_back(AddGlobalVariable(Name(out_vertex, "out_vertex")));
// Declare input attributes
vertex_index = DeclareInputBuiltIn(spv::BuiltIn::VertexIndex, t_in_uint, "vertex_index");
vertex_index = DeclareInputBuiltIn(spv::BuiltIn::VertexIndex, t_in_int, "vertex_index");
instance_index =
DeclareInputBuiltIn(spv::BuiltIn::InstanceIndex, t_in_uint, "instance_index");
DeclareInputBuiltIn(spv::BuiltIn::InstanceIndex, t_in_int, "instance_index");
base_vertex = DeclareInputBuiltIn(spv::BuiltIn::BaseVertex, t_in_int, "base_vertex");
base_instance = DeclareInputBuiltIn(spv::BuiltIn::BaseInstance, t_in_int, "base_instance");
}
void DeclareTessControl() {
@ -1068,9 +1072,12 @@ private:
return {OpLoad(t_float, AccessElement(t_in_float, tess_coord, element)),
Type::Float};
case 2:
return {OpLoad(t_uint, instance_index), Type::Uint};
return {
OpISub(t_int, OpLoad(t_int, instance_index), OpLoad(t_int, base_instance)),
Type::Int};
case 3:
return {OpLoad(t_uint, vertex_index), Type::Uint};
return {OpISub(t_int, OpLoad(t_int, vertex_index), OpLoad(t_int, base_vertex)),
Type::Int};
}
UNIMPLEMENTED_MSG("Unmanaged TessCoordInstanceIDVertexID element={}", element);
return {Constant(t_uint, 0U), Type::Uint};
@ -2542,6 +2549,8 @@ private:
Id instance_index{};
Id vertex_index{};
Id base_instance{};
Id base_vertex{};
std::array<Id, Maxwell::NumRenderTargets> frag_colors{};
Id frag_depth{};
Id frag_coord{};