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[dxvk] Optimize binding ID remapping

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We don't need to iterate over the full shader code when creating
a new shader module. This optimization may slightly reduce the
initial pipeline creation time.
This commit is contained in:
Philip Rebohle 2018-04-10 12:48:46 +02:00
parent 5d1642af1f
commit a28303c4bd
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GPG Key ID: C8CC613427A31C99
2 changed files with 14 additions and 12 deletions
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25
src/dxvk/dxvk_shader.cpp
View File

@ -49,6 +49,15 @@ namespace dxvk {
: m_stage(stage), m_code(code), m_interface(iface) {
for (uint32_t i = 0; i < slotCount; i++)
m_slots.push_back(slotInfos[i]);
// Gather the offsets where the binding IDs
// are stored so we can quickly remap them.
for (auto ins : m_code) {
if (ins.opCode() == spv::OpDecorate
&& ((ins.arg(2) == spv::DecorationBinding)
|| (ins.arg(2) == spv::DecorationSpecId)))
m_idOffsets.push_back(ins.offset() + 3);
}
}
@ -81,20 +90,12 @@ namespace dxvk {
Rc<DxvkShaderModule> DxvkShader::createShaderModule(
const Rc<vk::DeviceFn>& vkd,
const DxvkDescriptorSlotMapping& mapping) const {
// Iterate over the code and replace every resource slot
// index with the corresponding mapped binding index.
SpirvCodeBuffer spirvCode = m_code;
for (auto ins : spirvCode) {
if (ins.opCode() == spv::OpDecorate
&& ((ins.arg(2) == spv::DecorationBinding)
|| (ins.arg(2) == spv::DecorationSpecId))) {
const uint32_t oldBinding = ins.arg(3);
const uint32_t newBinding = mapping.getBindingId(oldBinding);
ins.setArg(3, newBinding);
}
}
// Remap resource binding IDs
uint32_t* code = spirvCode.data();
for (uint32_t ofs : m_idOffsets)
code[ofs] = mapping.getBindingId(code[ofs]);
return new DxvkShaderModule(vkd, m_stage, spirvCode, m_debugName);
}

1
src/dxvk/dxvk_shader.h
View File

@ -176,6 +176,7 @@ namespace dxvk {
SpirvCodeBuffer m_code;
std::vector<DxvkResourceSlot> m_slots;
std::vector<size_t> m_idOffsets;
DxvkInterfaceSlots m_interface;
std::string m_debugName;