Merge pull request #3518 from wwylele/hashable-struct
Common/Hash: abstract HashableStruct from GLShader::PicaShaderConfig
This commit is contained in:
commit
acb02d300c
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@ -5,6 +5,7 @@
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#pragma once
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#include <cstddef>
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#include <cstring>
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#include "common/cityhash.h"
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#include "common/common_types.h"
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@ -21,16 +22,50 @@ static inline u64 ComputeHash64(const void* data, size_t len) {
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}
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/**
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* Computes a 64-bit hash of a struct. In addition to being POD (trivially copyable and having
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* standard layout), it is also critical that either the struct includes no padding, or that any
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* padding is initialized to a known value by memsetting the struct to 0 before filling it in.
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* Computes a 64-bit hash of a struct. In addition to being trivially copyable, it is also critical
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* that either the struct includes no padding, or that any padding is initialized to a known value
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* by memsetting the struct to 0 before filling it in.
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*/
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template <typename T>
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static inline u64 ComputeStructHash64(const T& data) {
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static_assert(
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std::is_trivially_copyable<T>::value && std::is_standard_layout<T>::value,
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"Type passed to ComputeStructHash64 must be trivially copyable and standard layout");
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static_assert(std::is_trivially_copyable<T>(),
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"Type passed to ComputeStructHash64 must be trivially copyable");
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return ComputeHash64(&data, sizeof(data));
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}
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/// A helper template that ensures the padding in a struct is initialized by memsetting to 0.
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template <typename T>
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struct HashableStruct {
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// In addition to being trivially copyable, T must also have a trivial default constructor,
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// because any member initialization would be overridden by memset
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static_assert(std::is_trivial<T>(), "Type passed to HashableStruct must be trivial");
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/*
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* We use a union because "implicitly-defined copy/move constructor for a union X copies the
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* object representation of X." and "implicitly-defined copy assignment operator for a union X
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* copies the object representation (3.9) of X." = Bytewise copy instead of memberwise copy.
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* This is important because the padding bytes are included in the hash and comparison between
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* objects.
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*/
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union {
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T state;
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};
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HashableStruct() {
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// Memset structure to zero padding bits, so that they will be deterministic when hashing
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std::memset(&state, 0, sizeof(T));
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}
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bool operator==(const HashableStruct<T>& o) const {
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return std::memcmp(&state, &o.state, sizeof(T)) == 0;
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};
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bool operator!=(const HashableStruct<T>& o) const {
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return !(*this == o);
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};
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size_t Hash() const {
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return Common::ComputeStructHash64(state);
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}
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};
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} // namespace Common
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@ -65,8 +65,6 @@ PicaShaderConfig PicaShaderConfig::BuildFromRegs(const Pica::Regs& regs) {
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PicaShaderConfig res;
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auto& state = res.state;
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// Memset structure to zero padding bits, so that they will be deterministic when hashing
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std::memset(&state, 0, sizeof(PicaShaderConfig::State));
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state.scissor_test_mode = regs.rasterizer.scissor_test.mode;
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@ -24,6 +24,82 @@ enum Attributes {
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ATTRIBUTE_VIEW,
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};
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// NOTE: MSVC15 (Update 2) doesn't think `delete`'d constructors and operators are TC.
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// This makes BitField not TC when used in a union or struct so we have to resort
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// to this ugly hack.
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// Once that bug is fixed we can use Pica::Regs::TevStageConfig here.
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// Doesn't include const_color because we don't sync it, see comment in BuildFromRegs()
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struct TevStageConfigRaw {
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u32 sources_raw;
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u32 modifiers_raw;
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u32 ops_raw;
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u32 scales_raw;
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explicit operator Pica::TexturingRegs::TevStageConfig() const noexcept {
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Pica::TexturingRegs::TevStageConfig stage;
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stage.sources_raw = sources_raw;
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stage.modifiers_raw = modifiers_raw;
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stage.ops_raw = ops_raw;
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stage.const_color = 0;
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stage.scales_raw = scales_raw;
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return stage;
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}
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};
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struct PicaShaderConfigState {
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Pica::FramebufferRegs::CompareFunc alpha_test_func;
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Pica::RasterizerRegs::ScissorMode scissor_test_mode;
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Pica::TexturingRegs::TextureConfig::TextureType texture0_type;
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bool texture2_use_coord1;
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std::array<TevStageConfigRaw, 6> tev_stages;
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u8 combiner_buffer_input;
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Pica::RasterizerRegs::DepthBuffering depthmap_enable;
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Pica::TexturingRegs::FogMode fog_mode;
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bool fog_flip;
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struct {
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struct {
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unsigned num;
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bool directional;
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bool two_sided_diffuse;
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bool dist_atten_enable;
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bool spot_atten_enable;
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bool geometric_factor_0;
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bool geometric_factor_1;
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} light[8];
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bool enable;
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unsigned src_num;
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Pica::LightingRegs::LightingBumpMode bump_mode;
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unsigned bump_selector;
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bool bump_renorm;
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bool clamp_highlights;
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Pica::LightingRegs::LightingConfig config;
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Pica::LightingRegs::LightingFresnelSelector fresnel_selector;
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struct {
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bool enable;
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bool abs_input;
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Pica::LightingRegs::LightingLutInput type;
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float scale;
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} lut_d0, lut_d1, lut_sp, lut_fr, lut_rr, lut_rg, lut_rb;
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} lighting;
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struct {
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bool enable;
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u32 coord;
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Pica::TexturingRegs::ProcTexClamp u_clamp, v_clamp;
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Pica::TexturingRegs::ProcTexCombiner color_combiner, alpha_combiner;
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bool separate_alpha;
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bool noise_enable;
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Pica::TexturingRegs::ProcTexShift u_shift, v_shift;
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u32 lut_width;
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u32 lut_offset;
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Pica::TexturingRegs::ProcTexFilter lut_filter;
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} proctex;
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};
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/**
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* This struct contains all state used to generate the GLSL shader program that emulates the current
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* Pica register configuration. This struct is used as a cache key for generated GLSL shader
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@ -31,13 +107,8 @@ enum Attributes {
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* directly accessing Pica registers. This should reduce the risk of bugs in shader generation where
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* Pica state is not being captured in the shader cache key, thereby resulting in (what should be)
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* two separate shaders sharing the same key.
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*
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* We use a union because "implicitly-defined copy/move constructor for a union X copies the object
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* representation of X." and "implicitly-defined copy assignment operator for a union X copies the
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* object representation (3.9) of X." = Bytewise copy instead of memberwise copy. This is important
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* because the padding bytes are included in the hash and comparison between objects.
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*/
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union PicaShaderConfig {
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struct PicaShaderConfig : Common::HashableStruct<PicaShaderConfigState> {
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/// Construct a PicaShaderConfig with the given Pica register configuration.
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static PicaShaderConfig BuildFromRegs(const Pica::Regs& regs);
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@ -49,87 +120,6 @@ union PicaShaderConfig {
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bool TevStageUpdatesCombinerBufferAlpha(unsigned stage_index) const {
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return (stage_index < 4) && ((state.combiner_buffer_input >> 4) & (1 << stage_index));
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}
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bool operator==(const PicaShaderConfig& o) const {
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return std::memcmp(&state, &o.state, sizeof(PicaShaderConfig::State)) == 0;
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};
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// NOTE: MSVC15 (Update 2) doesn't think `delete`'d constructors and operators are TC.
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// This makes BitField not TC when used in a union or struct so we have to resort
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// to this ugly hack.
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// Once that bug is fixed we can use Pica::Regs::TevStageConfig here.
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// Doesn't include const_color because we don't sync it, see comment in BuildFromRegs()
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struct TevStageConfigRaw {
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u32 sources_raw;
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u32 modifiers_raw;
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u32 ops_raw;
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u32 scales_raw;
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explicit operator Pica::TexturingRegs::TevStageConfig() const noexcept {
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Pica::TexturingRegs::TevStageConfig stage;
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stage.sources_raw = sources_raw;
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stage.modifiers_raw = modifiers_raw;
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stage.ops_raw = ops_raw;
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stage.const_color = 0;
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stage.scales_raw = scales_raw;
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return stage;
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}
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};
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struct State {
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Pica::FramebufferRegs::CompareFunc alpha_test_func;
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Pica::RasterizerRegs::ScissorMode scissor_test_mode;
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Pica::TexturingRegs::TextureConfig::TextureType texture0_type;
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bool texture2_use_coord1;
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std::array<TevStageConfigRaw, 6> tev_stages;
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u8 combiner_buffer_input;
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Pica::RasterizerRegs::DepthBuffering depthmap_enable;
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Pica::TexturingRegs::FogMode fog_mode;
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bool fog_flip;
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struct {
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struct {
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unsigned num;
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bool directional;
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bool two_sided_diffuse;
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bool dist_atten_enable;
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bool spot_atten_enable;
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bool geometric_factor_0;
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bool geometric_factor_1;
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} light[8];
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bool enable;
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unsigned src_num;
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Pica::LightingRegs::LightingBumpMode bump_mode;
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unsigned bump_selector;
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bool bump_renorm;
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bool clamp_highlights;
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Pica::LightingRegs::LightingConfig config;
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Pica::LightingRegs::LightingFresnelSelector fresnel_selector;
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struct {
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bool enable;
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bool abs_input;
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Pica::LightingRegs::LightingLutInput type;
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float scale;
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} lut_d0, lut_d1, lut_sp, lut_fr, lut_rr, lut_rg, lut_rb;
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} lighting;
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struct {
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bool enable;
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u32 coord;
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Pica::TexturingRegs::ProcTexClamp u_clamp, v_clamp;
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Pica::TexturingRegs::ProcTexCombiner color_combiner, alpha_combiner;
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bool separate_alpha;
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bool noise_enable;
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Pica::TexturingRegs::ProcTexShift u_shift, v_shift;
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u32 lut_width;
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u32 lut_offset;
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Pica::TexturingRegs::ProcTexFilter lut_filter;
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} proctex;
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} state;
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};
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/**
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@ -152,7 +142,7 @@ namespace std {
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template <>
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struct hash<GLShader::PicaShaderConfig> {
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size_t operator()(const GLShader::PicaShaderConfig& k) const {
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return Common::ComputeStructHash64(k.state);
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return k.Hash();
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}
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};
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} // namespace std
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