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gl_shader_decompiler: Add AOFFI backing implementation

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This commit is contained in:
ReinUsesLisp 2019-03-29 18:37:37 -03:00
parent cb68ce7c2f
commit e8abe4b77c
1 changed files with 87 additions and 40 deletions
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87
src/video_core/renderer_opengl/gl_shader_decompiler.cpp
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@ -34,14 +34,20 @@ using Maxwell = Tegra::Engines::Maxwell3D::Regs;
using ShaderStage = Tegra::Engines::Maxwell3D::Regs::ShaderStage;
using Operation = const OperationNode&;
enum class Type { Bool, Bool2, Float, Int, Uint, HalfFloat };
namespace {
struct TextureAoffi {};
using TextureArgument = std::pair<Type, Node>;
using TextureIR = std::variant<TextureAoffi, TextureArgument>;
} // namespace
enum : u32 { POSITION_VARYING_LOCATION = 0, GENERIC_VARYING_START_LOCATION = 1 };
constexpr u32 MAX_CONSTBUFFER_ELEMENTS =
static_cast<u32>(RasterizerOpenGL::MaxConstbufferSize) / (4 * sizeof(float));
constexpr u32 MAX_GLOBALMEMORY_ELEMENTS =
static_cast<u32>(RasterizerOpenGL::MaxGlobalMemorySize) / sizeof(float);
enum class Type { Bool, Bool2, Float, Int, Uint, HalfFloat };
class ShaderWriter {
public:
void AddExpression(std::string_view text) {
@ -718,8 +724,8 @@ private:
result_type));
}
std::string GenerateTexture(Operation operation, const std::string& func,
const std::vector<std::pair<Type, Node>>& extras) {
std::string GenerateTexture(Operation operation, const std::string& function_suffix,
const std::vector<TextureIR>& extras) {
constexpr std::array<const char*, 4> coord_constructors = {"float", "vec2", "vec3", "vec4"};
const auto meta = std::get_if<MetaTexture>(&operation.GetMeta());
@ -729,11 +735,11 @@ private:
const bool has_array = meta->sampler.IsArray();
const bool has_shadow = meta->sampler.IsShadow();
std::string expr = func;
expr += '(';
expr += GetSampler(meta->sampler);
expr += ", ";
std::string expr = "texture" + function_suffix;
if (!meta->aoffi.empty()) {
expr += "Offset";
}
expr += '(' + GetSampler(meta->sampler) + ", ";
expr += coord_constructors.at(count + (has_array ? 1 : 0) + (has_shadow ? 1 : 0) - 1);
expr += '(';
for (std::size_t i = 0; i < count; ++i) {
@ -751,13 +757,26 @@ private:
}
expr += ')';
for (const auto& extra_pair : extras) {
const auto [type, operand] = extra_pair;
if (operand == nullptr) {
continue;
for (const auto& variant : extras) {
if (const auto argument = std::get_if<TextureArgument>(&variant)) {
expr += GenerateTextureArgument(*argument);
} else if (std::get_if<TextureAoffi>(&variant)) {
expr += GenerateTextureAoffi(meta->aoffi);
} else {
UNREACHABLE();
}
}
expr += ", ";
return expr + ')';
}
std::string GenerateTextureArgument(TextureArgument argument) {
const auto [type, operand] = argument;
if (operand == nullptr) {
return {};
}
std::string expr = ", ";
switch (type) {
case Type::Int:
if (const auto immediate = std::get_if<ImmediateNode>(operand)) {
@ -778,9 +797,34 @@ private:
break;
}
}
return expr;
}
return expr + ')';
std::string GenerateTextureAoffi(const std::vector<Node>& aoffi) {
if (aoffi.empty()) {
return {};
}
constexpr std::array<const char*, 3> coord_constructors = {"int", "ivec2", "ivec3"};
std::string expr = ", ";
expr += coord_constructors.at(aoffi.size() - 1);
expr += '(';
for (std::size_t index = 0; index < aoffi.size(); ++index) {
const auto operand{aoffi.at(index)};
if (const auto immediate = std::get_if<ImmediateNode>(operand)) {
// Inline the string as an immediate integer in GLSL (AOFFI arguments are required
// to be constant by the standard).
expr += std::to_string(static_cast<s32>(immediate->GetValue()));
} else {
expr += "ftoi(" + Visit(operand) + ')';
}
if (index + 1 < aoffi.size()) {
expr += ", ";
}
}
expr += ')';
return expr;
}
std::string Assign(Operation operation) {
@ -1159,7 +1203,8 @@ private:
const auto meta = std::get_if<MetaTexture>(&operation.GetMeta());
ASSERT(meta);
std::string expr = GenerateTexture(operation, "texture", {{Type::Float, meta->bias}});
std::string expr = GenerateTexture(
operation, "", {TextureAoffi{}, TextureArgument{Type::Float, meta->bias}});
if (meta->sampler.IsShadow()) {
expr = "vec4(" + expr + ')';
}
@ -1170,7 +1215,8 @@ private:
const auto meta = std::get_if<MetaTexture>(&operation.GetMeta());
ASSERT(meta);
std::string expr = GenerateTexture(operation, "textureLod", {{Type::Float, meta->lod}});
std::string expr = GenerateTexture(
operation, "Lod", {TextureArgument{Type::Float, meta->lod}, TextureAoffi{}});
if (meta->sampler.IsShadow()) {
expr = "vec4(" + expr + ')';
}
@ -1182,7 +1228,8 @@ private:
ASSERT(meta);
const auto type = meta->sampler.IsShadow() ? Type::Float : Type::Int;
return GenerateTexture(operation, "textureGather", {{type, meta->component}}) +
return GenerateTexture(operation, "Gather",
{TextureArgument{type, meta->component}, TextureAoffi{}}) +
GetSwizzle(meta->element);
}
@ -1211,8 +1258,8 @@ private:
ASSERT(meta);
if (meta->element < 2) {
return "itof(int((" + GenerateTexture(operation, "textureQueryLod", {}) +
" * vec2(256))" + GetSwizzle(meta->element) + "))";
return "itof(int((" + GenerateTexture(operation, "QueryLod", {}) + " * vec2(256))" +
GetSwizzle(meta->element) + "))";
}
return "0";
}