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Merge pull request #2118 from FernandoS27/ipa-improve

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shader_decompiler: Improve Accuracy of Attribute Interpolation.
This commit is contained in:
bunnei 2019-02-24 23:04:22 -05:00 committed by GitHub
commit c07987dfab
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6 changed files with 74 additions and 38 deletions
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6
src/video_core/engines/shader_bytecode.h
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@ -376,9 +376,9 @@ enum class R2pMode : u64 {
};
enum class IpaInterpMode : u64 {
Linear = 0,
Perspective = 1,
Flat = 2,
Pass = 0,
Multiply = 1,
Constant = 2,
Sc = 3,
};

41
src/video_core/engines/shader_header.h
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@ -16,6 +16,13 @@ enum class OutputTopology : u32 {
TriangleStrip = 7,
};
enum class AttributeUse : u8 {
Unused = 0,
Constant = 1,
Perspective = 2,
ScreenLinear = 3,
};
// Documentation in:
// http://download.nvidia.com/open-gpu-doc/Shader-Program-Header/1/Shader-Program-Header.html#ImapTexture
struct Header {
@ -84,9 +91,15 @@ struct Header {
} vtg;
struct {
INSERT_PADDING_BYTES(3); // ImapSystemValuesA
INSERT_PADDING_BYTES(1); // ImapSystemValuesB
INSERT_PADDING_BYTES(32); // ImapGenericVector[32]
INSERT_PADDING_BYTES(3); // ImapSystemValuesA
INSERT_PADDING_BYTES(1); // ImapSystemValuesB
union {
BitField<0, 2, AttributeUse> x;
BitField<2, 2, AttributeUse> y;
BitField<4, 2, AttributeUse> w;
BitField<6, 2, AttributeUse> z;
u8 raw;
} imap_generic_vector[32];
INSERT_PADDING_BYTES(2); // ImapColor
INSERT_PADDING_BYTES(2); // ImapSystemValuesC
INSERT_PADDING_BYTES(10); // ImapFixedFncTexture[10]
@ -103,6 +116,28 @@ struct Header {
const u32 bit = render_target * 4 + component;
return omap.target & (1 << bit);
}
AttributeUse GetAttributeIndexUse(u32 attribute, u32 index) const {
return static_cast<AttributeUse>(
(imap_generic_vector[attribute].raw >> (index * 2)) & 0x03);
}
AttributeUse GetAttributeUse(u32 attribute) const {
AttributeUse result = AttributeUse::Unused;
for (u32 i = 0; i < 4; i++) {
const auto index = GetAttributeIndexUse(attribute, i);
if (index == AttributeUse::Unused) {
continue;
}
if (result == AttributeUse::Unused || result == index) {
result = index;
continue;
}
LOG_CRITICAL(HW_GPU, "Generic Attribute Conflict in Interpolation Mode");
if (index == AttributeUse::Perspective) {
result = index;
}
}
return result;
}
} ps;
};

44
src/video_core/renderer_opengl/gl_shader_decompiler.cpp
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@ -20,6 +20,7 @@
namespace OpenGL::GLShader {
using Tegra::Shader::Attribute;
using Tegra::Shader::AttributeUse;
using Tegra::Shader::Header;
using Tegra::Shader::IpaInterpMode;
using Tegra::Shader::IpaMode;
@ -288,34 +289,22 @@ private:
code.AddNewLine();
}
std::string GetInputFlags(const IpaMode& input_mode) {
const IpaSampleMode sample_mode = input_mode.sampling_mode;
const IpaInterpMode interp_mode = input_mode.interpolation_mode;
std::string GetInputFlags(AttributeUse attribute) {
std::string out;
switch (interp_mode) {
case IpaInterpMode::Flat:
switch (attribute) {
case AttributeUse::Constant:
out += "flat ";
break;
case IpaInterpMode::Linear:
case AttributeUse::ScreenLinear:
out += "noperspective ";
break;
case IpaInterpMode::Perspective:
case AttributeUse::Perspective:
// Default, Smooth
break;
default:
UNIMPLEMENTED_MSG("Unhandled IPA interp mode: {}", static_cast<u32>(interp_mode));
}
switch (sample_mode) {
case IpaSampleMode::Centroid:
// It can be implemented with the "centroid " keyword in GLSL
UNIMPLEMENTED_MSG("Unimplemented IPA sampler mode centroid");
break;
case IpaSampleMode::Default:
// Default, n/a
break;
default:
UNIMPLEMENTED_MSG("Unimplemented IPA sampler mode: {}", static_cast<u32>(sample_mode));
LOG_CRITICAL(HW_GPU, "Unused attribute being fetched");
UNREACHABLE();
}
return out;
}
@ -324,16 +313,11 @@ private:
const auto& attributes = ir.GetInputAttributes();
for (const auto element : attributes) {
const Attribute::Index index = element.first;
const IpaMode& input_mode = *element.second.begin();
if (index < Attribute::Index::Attribute_0 || index > Attribute::Index::Attribute_31) {
// Skip when it's not a generic attribute
continue;
}
ASSERT(element.second.size() > 0);
UNIMPLEMENTED_IF_MSG(element.second.size() > 1,
"Multiple input flag modes are not supported in GLSL");
// TODO(bunnei): Use proper number of elements for these
u32 idx = static_cast<u32>(index) - static_cast<u32>(Attribute::Index::Attribute_0);
if (stage != ShaderStage::Vertex) {
@ -345,8 +329,14 @@ private:
if (stage == ShaderStage::Geometry) {
attr = "gs_" + attr + "[]";
}
code.AddLine("layout (location = " + std::to_string(idx) + ") " +
GetInputFlags(input_mode) + "in vec4 " + attr + ';');
std::string suffix;
if (stage == ShaderStage::Fragment) {
const auto input_mode =
header.ps.GetAttributeUse(idx - GENERIC_VARYING_START_LOCATION);
suffix = GetInputFlags(input_mode);
}
code.AddLine("layout (location = " + std::to_string(idx) + ") " + suffix + "in vec4 " +
attr + ';');
}
if (!attributes.empty())
code.AddNewLine();
@ -1584,4 +1574,4 @@ ProgramResult Decompile(const ShaderIR& ir, Maxwell::ShaderStage stage, const st
return {decompiler.GetResult(), decompiler.GetShaderEntries()};
}
} // namespace OpenGL::GLShader
} // namespace OpenGL::GLShader

4
src/video_core/renderer_opengl/gl_shader_gen.cpp
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@ -124,7 +124,7 @@ layout (location = 5) out vec4 FragColor5;
layout (location = 6) out vec4 FragColor6;
layout (location = 7) out vec4 FragColor7;
layout (location = 0) in vec4 position;
layout (location = 0) in noperspective vec4 position;
layout (std140, binding = EMULATION_UBO_BINDING) uniform fs_config {
vec4 viewport_flip;
@ -172,4 +172,4 @@ void main() {
return {out, program.second};
}
} // namespace OpenGL::GLShader
} // namespace OpenGL::GLShader

2
src/video_core/shader/decode/memory.cpp
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@ -48,7 +48,7 @@ u32 ShaderIR::DecodeMemory(NodeBlock& bb, u32 pc) {
UNIMPLEMENTED_IF_MSG((instr.attribute.fmt20.immediate.Value() % sizeof(u32)) != 0,
"Unaligned attribute loads are not supported");
Tegra::Shader::IpaMode input_mode{Tegra::Shader::IpaInterpMode::Perspective,
Tegra::Shader::IpaMode input_mode{Tegra::Shader::IpaInterpMode::Pass,
Tegra::Shader::IpaSampleMode::Default};
u64 next_element = instr.attribute.fmt20.element;

15
src/video_core/shader/decode/other.cpp
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@ -135,7 +135,18 @@ u32 ShaderIR::DecodeOther(NodeBlock& bb, u32 pc) {
instr.ipa.sample_mode.Value()};
const Node attr = GetInputAttribute(attribute.index, attribute.element, input_mode);
const Node value = GetSaturatedFloat(attr, instr.ipa.saturate);
Node value = attr;
const Tegra::Shader::Attribute::Index index = attribute.index.Value();
if (index >= Tegra::Shader::Attribute::Index::Attribute_0 &&
index <= Tegra::Shader::Attribute::Index::Attribute_31) {
// TODO(Blinkhawk): There are cases where a perspective attribute use PASS.
// In theory by setting them as perspective, OpenGL does the perspective correction.
// A way must figured to reverse the last step of it.
if (input_mode.interpolation_mode == Tegra::Shader::IpaInterpMode::Multiply) {
value = Operation(OperationCode::FMul, PRECISE, value, GetRegister(instr.gpr20));
}
}
value = GetSaturatedFloat(value, instr.ipa.saturate);
SetRegister(bb, instr.gpr0, value);
break;
@ -175,4 +186,4 @@ u32 ShaderIR::DecodeOther(NodeBlock& bb, u32 pc) {
return pc;
}
} // namespace VideoCommon::Shader
} // namespace VideoCommon::Shader