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gl_shader_decompiler: Decorate output attributes with XFB layout 

We sometimes have to slice attributes in different parts. This is needed
for example in instances where the game feedbacks 3 components but
writes 4 from the shader (something that is possible with
GL_NV_transform_feedback).
This commit is contained in:
ReinUsesLisp 2020-03-02 18:55:39 -03:00
parent 3dcaa84ba4
commit 4d711dface
1 changed files with 105 additions and 29 deletions
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134
src/video_core/renderer_opengl/gl_shader_decompiler.cpp
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@ -23,6 +23,7 @@
#include "video_core/shader/ast.h"
#include "video_core/shader/node.h"
#include "video_core/shader/shader_ir.h"
#include "video_core/shader/transform_feedback.h"
namespace OpenGL {
@ -36,6 +37,7 @@ using Tegra::Shader::IpaInterpMode;
using Tegra::Shader::IpaMode;
using Tegra::Shader::IpaSampleMode;
using Tegra::Shader::Register;
using VideoCommon::Shader::BuildTransformFeedback;
using VideoCommon::Shader::Registry;
using namespace std::string_literals;
@ -49,6 +51,11 @@ class ExprDecompiler;
enum class Type { Void, Bool, Bool2, Float, Int, Uint, HalfFloat };
constexpr std::array FLOAT_TYPES{"float", "vec2", "vec3", "vec4"};
constexpr std::string_view INPUT_ATTRIBUTE_NAME = "in_attr";
constexpr std::string_view OUTPUT_ATTRIBUTE_NAME = "out_attr";
struct TextureOffset {};
struct TextureDerivates {};
using TextureArgument = std::pair<Type, Node>;
@ -390,12 +397,19 @@ std::string FlowStackTopName(MetaStackClass stack) {
return stage == ShaderType::Vertex;
}
struct GenericVaryingDescription {
std::string name;
u8 first_element = 0;
bool is_scalar = false;
};
class GLSLDecompiler final {
public:
explicit GLSLDecompiler(const Device& device, const ShaderIR& ir, const Registry& registry,
ShaderType stage, std::string_view identifier, std::string_view suffix)
: device{device}, ir{ir}, registry{registry}, stage{stage},
identifier{identifier}, suffix{suffix}, header{ir.GetHeader()} {}
identifier{identifier}, suffix{suffix}, header{ir.GetHeader()},
transform_feedback{BuildTransformFeedback(registry.GetGraphicsInfo())} {}
void Decompile() {
DeclareHeader();
@ -403,17 +417,17 @@ public:
DeclareGeometry();
DeclareFragment();
DeclareCompute();
DeclareRegisters();
DeclareCustomVariables();
DeclarePredicates();
DeclareLocalMemory();
DeclareInternalFlags();
DeclareInputAttributes();
DeclareOutputAttributes();
DeclareConstantBuffers();
DeclareGlobalMemory();
DeclareSamplers();
DeclareImages();
DeclareSamplers();
DeclareGlobalMemory();
DeclareConstantBuffers();
DeclareLocalMemory();
DeclareRegisters();
DeclarePredicates();
DeclareInternalFlags();
DeclareCustomVariables();
DeclarePhysicalAttributeReader();
code.AddLine("void main() {{");
@ -485,7 +499,7 @@ private:
if (!identifier.empty()) {
code.AddLine("// {}", identifier);
}
code.AddLine("#version 430 core");
code.AddLine("#version 440 core");
code.AddLine("#extension GL_ARB_separate_shader_objects : enable");
if (device.HasShaderBallot()) {
code.AddLine("#extension GL_ARB_shader_ballot : require");
@ -570,7 +584,13 @@ private:
code.AddLine("out gl_PerVertex {{");
++code.scope;
code.AddLine("vec4 gl_Position;");
auto pos_xfb = GetTransformFeedbackDecoration(Attribute::Index::Position);
if (!pos_xfb.empty()) {
pos_xfb = fmt::format("layout ({}) ", pos_xfb);
}
const char* pos_type =
FLOAT_TYPES.at(GetNumComponents(Attribute::Index::Position).value_or(4) - 1);
code.AddLine("{}{} gl_Position;", pos_xfb, pos_type);
for (const auto attribute : ir.GetOutputAttributes()) {
if (attribute == Attribute::Index::ClipDistances0123 ||
@ -703,7 +723,7 @@ private:
void DeclareInputAttribute(Attribute::Index index, bool skip_unused) {
const u32 location{GetGenericAttributeIndex(index)};
std::string name{GetInputAttribute(index)};
std::string name{GetGenericInputAttribute(index)};
if (stage == ShaderType::Geometry) {
name = "gs_" + name + "[]";
}
@ -740,9 +760,58 @@ private:
}
}
std::optional<std::size_t> GetNumComponents(Attribute::Index index, u8 element = 0) const {
const u8 location = static_cast<u8>(index) * 4 + element;
const auto it = transform_feedback.find(location);
if (it == transform_feedback.end()) {
return {};
}
return it->second.components;
}
std::string GetTransformFeedbackDecoration(Attribute::Index index, u8 element = 0) const {
const u8 location = static_cast<u8>(index) * 4 + element;
const auto it = transform_feedback.find(location);
if (it == transform_feedback.end()) {
return {};
}
const VaryingTFB& tfb = it->second;
return fmt::format("xfb_buffer = {}, xfb_offset = {}", tfb.buffer, tfb.offset);
}
void DeclareOutputAttribute(Attribute::Index index) {
const u32 location{GetGenericAttributeIndex(index)};
code.AddLine("layout (location = {}) out vec4 {};", location, GetOutputAttribute(index));
static constexpr std::string_view swizzle = "xyzw";
u8 element = 0;
while (element < 4) {
auto xfb = GetTransformFeedbackDecoration(index, element);
if (!xfb.empty()) {
xfb = fmt::format(", {}", xfb);
}
const std::size_t remainder = 4 - element;
const std::size_t num_components = GetNumComponents(index, element).value_or(remainder);
const char* const type = FLOAT_TYPES.at(num_components - 1);
const u32 location = GetGenericAttributeIndex(index);
GenericVaryingDescription description;
description.first_element = static_cast<u8>(element);
description.is_scalar = num_components == 1;
description.name = AppendSuffix(location, OUTPUT_ATTRIBUTE_NAME);
if (element != 0 || num_components != 4) {
const std::string_view name_swizzle = swizzle.substr(element, num_components);
description.name = fmt::format("{}_{}", description.name, name_swizzle);
}
for (std::size_t i = 0; i < num_components; ++i) {
const u8 offset = static_cast<u8>(location * 4 + element + i);
varying_description.insert({offset, description});
}
code.AddLine("layout (location = {}, component = {}{}) out {} {};", location, element,
xfb, type, description.name);
element += static_cast<u8>(num_components);
}
}
void DeclareConstantBuffers() {
@ -1095,7 +1164,7 @@ private:
return {"0", Type::Int};
default:
if (IsGenericAttribute(attribute)) {
return {GeometryPass(GetInputAttribute(attribute)) + GetSwizzle(element),
return {GeometryPass(GetGenericInputAttribute(attribute)) + GetSwizzle(element),
Type::Float};
}
break;
@ -1164,8 +1233,7 @@ private:
return {{fmt::format("gl_ClipDistance[{}]", abuf->GetElement() + 4), Type::Float}};
default:
if (IsGenericAttribute(attribute)) {
return {
{GetOutputAttribute(attribute) + GetSwizzle(abuf->GetElement()), Type::Float}};
return {{GetGenericOutputAttribute(attribute, abuf->GetElement()), Type::Float}};
}
UNIMPLEMENTED_MSG("Unhandled output attribute: {}", static_cast<u32>(attribute));
return {};
@ -2376,27 +2444,34 @@ private:
static_assert(operation_decompilers.size() == static_cast<std::size_t>(OperationCode::Amount));
std::string GetRegister(u32 index) const {
return GetDeclarationWithSuffix(index, "gpr");
return AppendSuffix(index, "gpr");
}
std::string GetCustomVariable(u32 index) const {
return GetDeclarationWithSuffix(index, "custom_var");
return AppendSuffix(index, "custom_var");
}
std::string GetPredicate(Tegra::Shader::Pred pred) const {
return GetDeclarationWithSuffix(static_cast<u32>(pred), "pred");
return AppendSuffix(static_cast<u32>(pred), "pred");
}
std::string GetInputAttribute(Attribute::Index attribute) const {
return GetDeclarationWithSuffix(GetGenericAttributeIndex(attribute), "input_attr");
std::string GetGenericInputAttribute(Attribute::Index attribute) const {
return AppendSuffix(GetGenericAttributeIndex(attribute), INPUT_ATTRIBUTE_NAME);
}
std::string GetOutputAttribute(Attribute::Index attribute) const {
return GetDeclarationWithSuffix(GetGenericAttributeIndex(attribute), "output_attr");
std::unordered_map<u8, GenericVaryingDescription> varying_description;
std::string GetGenericOutputAttribute(Attribute::Index attribute, std::size_t element) const {
const u8 offset = static_cast<u8>(GetGenericAttributeIndex(attribute) * 4 + element);
const auto& description = varying_description.at(offset);
if (description.is_scalar) {
return description.name;
}
return fmt::format("{}[{}]", description.name, element - description.first_element);
}
std::string GetConstBuffer(u32 index) const {
return GetDeclarationWithSuffix(index, "cbuf");
return AppendSuffix(index, "cbuf");
}
std::string GetGlobalMemory(const GlobalMemoryBase& descriptor) const {
@ -2409,7 +2484,7 @@ private:
}
std::string GetConstBufferBlock(u32 index) const {
return GetDeclarationWithSuffix(index, "cbuf_block");
return AppendSuffix(index, "cbuf_block");
}
std::string GetLocalMemory() const {
@ -2434,14 +2509,14 @@ private:
}
std::string GetSampler(const Sampler& sampler) const {
return GetDeclarationWithSuffix(static_cast<u32>(sampler.GetIndex()), "sampler");
return AppendSuffix(static_cast<u32>(sampler.GetIndex()), "sampler");
}
std::string GetImage(const Image& image) const {
return GetDeclarationWithSuffix(static_cast<u32>(image.GetIndex()), "image");
return AppendSuffix(static_cast<u32>(image.GetIndex()), "image");
}
std::string GetDeclarationWithSuffix(u32 index, std::string_view name) const {
std::string AppendSuffix(u32 index, std::string_view name) const {
if (suffix.empty()) {
return fmt::format("{}{}", name, index);
} else {
@ -2477,6 +2552,7 @@ private:
const std::string_view identifier;
const std::string_view suffix;
const Header header;
const std::unordered_map<u8, VaryingTFB> transform_feedback;
ShaderWriter code;