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MslShaderGenerator.cpp
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MslShaderGenerator.cpp
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//
// Copyright Contributors to the MaterialX Project
// SPDX-License-Identifier: Apache-2.0
//
#include <MaterialXGenMsl/MslShaderGenerator.h>
#include <MaterialXGenMsl/MslSyntax.h>
#include <MaterialXGenMsl/Nodes/GeomColorNodeMsl.h>
#include <MaterialXGenMsl/Nodes/GeomPropValueNodeMsl.h>
#include <MaterialXGenMsl/Nodes/SurfaceNodeMsl.h>
#include <MaterialXGenMsl/Nodes/UnlitSurfaceNodeMsl.h>
#include <MaterialXGenMsl/Nodes/LightNodeMsl.h>
#include <MaterialXGenMsl/Nodes/LightCompoundNodeMsl.h>
#include <MaterialXGenMsl/Nodes/LightShaderNodeMsl.h>
#include <MaterialXGenMsl/Nodes/HeightToNormalNodeMsl.h>
#include <MaterialXGenMsl/Nodes/LightSamplerNodeMsl.h>
#include <MaterialXGenMsl/Nodes/NumLightsNodeMsl.h>
#include <MaterialXGenMsl/Nodes/BlurNodeMsl.h>
#include <MaterialXGenShader/Nodes/MaterialNode.h>
#include <MaterialXGenShader/Nodes/HwImageNode.h>
#include <MaterialXGenShader/Nodes/HwTexCoordNode.h>
#include <MaterialXGenShader/Nodes/HwTransformNode.h>
#include <MaterialXGenShader/Nodes/HwPositionNode.h>
#include <MaterialXGenShader/Nodes/HwNormalNode.h>
#include <MaterialXGenShader/Nodes/HwTangentNode.h>
#include <MaterialXGenShader/Nodes/HwBitangentNode.h>
#include <MaterialXGenShader/Nodes/HwFrameNode.h>
#include <MaterialXGenShader/Nodes/HwTimeNode.h>
#include <MaterialXGenShader/Nodes/HwViewDirectionNode.h>
#include <MaterialXGenShader/Nodes/ClosureSourceCodeNode.h>
#include <MaterialXGenShader/Nodes/ClosureCompoundNode.h>
#include <MaterialXGenShader/Nodes/ClosureLayerNode.h>
#include <MaterialXGenShader/Nodes/ClosureMixNode.h>
#include <MaterialXGenShader/Nodes/ClosureAddNode.h>
#include <MaterialXGenShader/Nodes/ClosureMultiplyNode.h>
#include "MslResourceBindingContext.h"
#include <cctype>
MATERIALX_NAMESPACE_BEGIN
const string MslShaderGenerator::TARGET = "genmsl";
const string MslShaderGenerator::VERSION = "2.3";
//
// MslShaderGenerator methods
//
MslShaderGenerator::MslShaderGenerator() :
HwShaderGenerator(MslSyntax::create())
{
//
// Register all custom node implementation classes
//
StringVec elementNames;
// <!-- <position> -->
registerImplementation("IM_position_vector3_" + MslShaderGenerator::TARGET, HwPositionNode::create);
// <!-- <normal> -->
registerImplementation("IM_normal_vector3_" + MslShaderGenerator::TARGET, HwNormalNode::create);
// <!-- <tangent> -->
registerImplementation("IM_tangent_vector3_" + MslShaderGenerator::TARGET, HwTangentNode::create);
// <!-- <bitangent> -->
registerImplementation("IM_bitangent_vector3_" + MslShaderGenerator::TARGET, HwBitangentNode::create);
// <!-- <texcoord> -->
registerImplementation("IM_texcoord_vector2_" + MslShaderGenerator::TARGET, HwTexCoordNode::create);
registerImplementation("IM_texcoord_vector3_" + MslShaderGenerator::TARGET, HwTexCoordNode::create);
// <!-- <geomcolor> -->
registerImplementation("IM_geomcolor_float_" + MslShaderGenerator::TARGET, GeomColorNodeMsl::create);
registerImplementation("IM_geomcolor_color3_" + MslShaderGenerator::TARGET, GeomColorNodeMsl::create);
registerImplementation("IM_geomcolor_color4_" + MslShaderGenerator::TARGET, GeomColorNodeMsl::create);
// <!-- <geompropvalue> -->
elementNames = {
"IM_geompropvalue_integer_" + MslShaderGenerator::TARGET,
"IM_geompropvalue_float_" + MslShaderGenerator::TARGET,
"IM_geompropvalue_color3_" + MslShaderGenerator::TARGET,
"IM_geompropvalue_color4_" + MslShaderGenerator::TARGET,
"IM_geompropvalue_vector2_" + MslShaderGenerator::TARGET,
"IM_geompropvalue_vector3_" + MslShaderGenerator::TARGET,
"IM_geompropvalue_vector4_" + MslShaderGenerator::TARGET,
};
registerImplementation(elementNames, GeomPropValueNodeMsl::create);
registerImplementation("IM_geompropvalue_boolean_" + MslShaderGenerator::TARGET, GeomPropValueNodeMslAsUniform::create);
registerImplementation("IM_geompropvalue_string_" + MslShaderGenerator::TARGET, GeomPropValueNodeMslAsUniform::create);
// <!-- <frame> -->
registerImplementation("IM_frame_float_" + MslShaderGenerator::TARGET, HwFrameNode::create);
// <!-- <time> -->
registerImplementation("IM_time_float_" + MslShaderGenerator::TARGET, HwTimeNode::create);
// <!-- <viewdirection> -->
registerImplementation("IM_viewdirection_vector3_" + MslShaderGenerator::TARGET, HwViewDirectionNode::create);
// <!-- <surface> -->
registerImplementation("IM_surface_" + MslShaderGenerator::TARGET, SurfaceNodeMsl::create);
registerImplementation("IM_surface_unlit_" + MslShaderGenerator::TARGET, UnlitSurfaceNodeMsl::create);
// <!-- <light> -->
registerImplementation("IM_light_" + MslShaderGenerator::TARGET, LightNodeMsl::create);
// <!-- <point_light> -->
registerImplementation("IM_point_light_" + MslShaderGenerator::TARGET, LightShaderNodeMsl::create);
// <!-- <directional_light> -->
registerImplementation("IM_directional_light_" + MslShaderGenerator::TARGET, LightShaderNodeMsl::create);
// <!-- <spot_light> -->
registerImplementation("IM_spot_light_" + MslShaderGenerator::TARGET, LightShaderNodeMsl::create);
// <!-- <heighttonormal> -->
registerImplementation("IM_heighttonormal_vector3_" + MslShaderGenerator::TARGET, HeightToNormalNodeMsl::create);
// <!-- <blur> -->
elementNames = {
"IM_blur_float_" + MslShaderGenerator::TARGET,
"IM_blur_color3_" + MslShaderGenerator::TARGET,
"IM_blur_color4_" + MslShaderGenerator::TARGET,
"IM_blur_vector2_" + MslShaderGenerator::TARGET,
"IM_blur_vector3_" + MslShaderGenerator::TARGET,
"IM_blur_vector4_" + MslShaderGenerator::TARGET,
};
registerImplementation(elementNames, BlurNodeMsl::create);
// <!-- <ND_transformpoint> ->
registerImplementation("IM_transformpoint_vector3_" + MslShaderGenerator::TARGET, HwTransformPointNode::create);
// <!-- <ND_transformvector> ->
registerImplementation("IM_transformvector_vector3_" + MslShaderGenerator::TARGET, HwTransformVectorNode::create);
// <!-- <ND_transformnormal> ->
registerImplementation("IM_transformnormal_vector3_" + MslShaderGenerator::TARGET, HwTransformNormalNode::create);
// <!-- <image> -->
elementNames = {
"IM_image_float_" + MslShaderGenerator::TARGET,
"IM_image_color3_" + MslShaderGenerator::TARGET,
"IM_image_color4_" + MslShaderGenerator::TARGET,
"IM_image_vector2_" + MslShaderGenerator::TARGET,
"IM_image_vector3_" + MslShaderGenerator::TARGET,
"IM_image_vector4_" + MslShaderGenerator::TARGET,
};
registerImplementation(elementNames, HwImageNode::create);
// <!-- <layer> -->
registerImplementation("IM_layer_bsdf_" + MslShaderGenerator::TARGET, ClosureLayerNode::create);
registerImplementation("IM_layer_vdf_" + MslShaderGenerator::TARGET, ClosureLayerNode::create);
// <!-- <mix> -->
registerImplementation("IM_mix_bsdf_" + MslShaderGenerator::TARGET, ClosureMixNode::create);
registerImplementation("IM_mix_edf_" + MslShaderGenerator::TARGET, ClosureMixNode::create);
// <!-- <add> -->
registerImplementation("IM_add_bsdf_" + MslShaderGenerator::TARGET, ClosureAddNode::create);
registerImplementation("IM_add_edf_" + MslShaderGenerator::TARGET, ClosureAddNode::create);
// <!-- <multiply> -->
elementNames = {
"IM_multiply_bsdfC_" + MslShaderGenerator::TARGET,
"IM_multiply_bsdfF_" + MslShaderGenerator::TARGET,
"IM_multiply_edfC_" + MslShaderGenerator::TARGET,
"IM_multiply_edfF_" + MslShaderGenerator::TARGET,
};
registerImplementation(elementNames, ClosureMultiplyNode::create);
// <!-- <surfacematerial> -->
registerImplementation("IM_surfacematerial_" + MslShaderGenerator::TARGET, MaterialNode::create);
_lightSamplingNodes.push_back(ShaderNode::create(nullptr, "numActiveLightSources", NumLightsNodeMsl::create()));
_lightSamplingNodes.push_back(ShaderNode::create(nullptr, "sampleLightSource", LightSamplerNodeMsl::create()));
}
ShaderPtr MslShaderGenerator::generate(const string& name, ElementPtr element, GenContext& context) const
{
ShaderPtr shader = createShader(name, element, context);
// Request fixed floating-point notation for consistency across targets.
ScopedFloatFormatting fmt(Value::FloatFormatFixed);
// Make sure we initialize/reset the binding context before generation.
HwResourceBindingContextPtr resourceBindingCtx = getResourceBindingContext(context);
if (!resourceBindingCtx)
{
context.pushUserData(HW::USER_DATA_BINDING_CONTEXT, MslResourceBindingContext::create());
resourceBindingCtx = context.getUserData<HwResourceBindingContext>(HW::USER_DATA_BINDING_CONTEXT);
}
// Make sure we initialize/reset the binding context before generation.
if (resourceBindingCtx)
{
resourceBindingCtx->initialize();
}
// Emit code for vertex shader stage
ShaderStage& vs = shader->getStage(Stage::VERTEX);
emitVertexStage(shader->getGraph(), context, vs);
replaceTokens(_tokenSubstitutions, vs);
// Emit code for pixel shader stage
ShaderStage& ps = shader->getStage(Stage::PIXEL);
emitPixelStage(shader->getGraph(), context, ps);
replaceTokens(_tokenSubstitutions, ps);
MetalizeGeneratedShader(ps);
return shader;
}
void MslShaderGenerator::MetalizeGeneratedShader(ShaderStage& shaderStage) const
{
std::string sourceCode = shaderStage.getSourceCode();
// Used to convert shared code between GLSL pass by reference parameters to MSL pass by reference.
// Converts "inout/out Type variableName" to "thread Type& variableName"
size_t pos = 0;
{
std::array<string, 2> refKeywords = { "out", "inout" };
for (const auto& keyword : refKeywords)
{
pos = sourceCode.find(keyword);
while (pos != std::string::npos)
{
char preceeding = sourceCode[pos - 1], succeeding = sourceCode[pos + keyword.length()];
bool isOutKeyword =
(preceeding == '(' || preceeding == ',' || std::isspace(preceeding)) &&
std::isspace(succeeding) &&
succeeding != '\n';
size_t beg = pos;
pos += keyword.length();
if (isOutKeyword)
{
while (std::isspace(sourceCode[pos]))
{
++pos;
}
size_t typename_beg = pos;
while (!std::isspace(sourceCode[pos]))
{
++pos;
}
size_t typename_end = pos;
std::string typeName = sourceCode.substr(typename_beg, typename_end - typename_beg);
sourceCode.replace(beg, typename_end - beg, "thread " + typeName + "&");
}
pos = sourceCode.find(keyword, pos);
}
}
}
// Renames GLSL constructs that are used in shared code to MSL equivalent constructs.
std::unordered_map<string, string> replaceTokens;
replaceTokens["sampler2D"] = "MetalTexture";
replaceTokens["dFdy"] = "dfdy";
replaceTokens["dFdx"] = "dfdx";
auto isAllowedAfterToken = [](char ch) -> bool
{
return std::isspace(ch) || ch == '(' || ch == ')' || ch == ',';
};
auto isAllowedBeforeToken = [](char ch) -> bool
{
return std::isspace(ch) || ch == '(' || ch == ',';
};
for (const auto& t : replaceTokens)
{
pos = sourceCode.find(t.first);
while (pos != std::string::npos)
{
bool isOutKeyword = isAllowedBeforeToken(sourceCode[pos - 1]);
size_t beg = pos;
pos += t.first.length();
isOutKeyword &= isAllowedAfterToken(sourceCode[pos]);
if (isOutKeyword)
{
sourceCode.replace(beg, t.first.length(), t.second);
pos = sourceCode.find(t.first, beg + t.second.length());
}
else
{
pos = sourceCode.find(t.first, beg + t.first.length());
}
}
}
shaderStage.setSourceCode(sourceCode);
}
void MslShaderGenerator::emitGlobalVariables(GenContext& context,
ShaderStage& stage,
EmitGlobalScopeContext situation,
bool isVertexShader, bool needsLightData) const
{
int tex_slot = 0;
int buffer_slot = isVertexShader ? std::max(static_cast<int>(stage.getInputBlock(HW::VERTEX_INPUTS).size()), 0) : 0;
bool entryFunctionArgs =
situation == EMIT_GLOBAL_SCOPE_CONTEXT_ENTRY_FUNCTION_RESOURCES;
bool globalContextInit =
situation == EMIT_GLOBAL_SCOPE_CONTEXT_MEMBER_INIT;
bool globalContextMembers =
situation == EMIT_GLOBAL_SCOPE_CONTEXT_MEMBER_DECL;
bool globalContextConstructorParams =
situation == EMIT_GLOBAL_SCOPE_CONTEXT_CONSTRUCTOR_ARGS;
bool globalContextConstructorInit =
situation == EMIT_GLOBAL_SCOPE_CONTEXT_CONSTRUCTOR_INIT;
std::string separator = "";
DEFINE_SHADER_STAGE(stage, Stage::PIXEL)
{
if (globalContextMembers)
{
emitLine("vec4 gl_FragCoord", stage);
}
if (globalContextConstructorInit)
{
emitString("gl_FragCoord(", stage);
emitLine(stage.getInputBlock(HW::VERTEX_DATA).getInstance() + ".pos)", stage, false);
separator = ",";
}
}
{
auto vertex_inputs = isVertexShader ? stage.getInputBlock(HW::VERTEX_INPUTS)
: stage.getInputBlock(HW::VERTEX_DATA);
if (!entryFunctionArgs)
{
if (isVertexShader)
{
for (const auto& it : vertex_inputs.getVariableOrder())
{
emitString(separator, stage);
if (globalContextInit)
{
emitString(vertex_inputs.getInstance() + "." + it->getName(), stage);
}
else if (globalContextMembers || globalContextConstructorParams)
{
emitLine(_syntax->getTypeName(it->getType()) + " " + it->getName(), stage, !globalContextConstructorParams);
}
else if (globalContextConstructorInit)
{
emitLine(it->getName() + "(" + it->getName() + ")", stage, false);
}
if (globalContextInit || globalContextConstructorParams || globalContextConstructorInit)
separator = ", ";
else if (globalContextMembers)
separator = "\n";
}
}
else
{
emitString(separator, stage);
if (globalContextInit)
{
emitString(vertex_inputs.getInstance(), stage);
separator = ", ";
}
else if (globalContextMembers || globalContextConstructorParams)
{
emitLine(vertex_inputs.getName() + " " + vertex_inputs.getInstance(), stage, !globalContextConstructorParams);
if (globalContextConstructorParams)
separator = ", ";
else
separator = "\n";
}
else if (globalContextConstructorInit)
{
emitLine(vertex_inputs.getInstance() + "(" + vertex_inputs.getInstance() + ")", stage, false);
separator = ", ";
}
}
}
else
{
emitString(vertex_inputs.getName() + " " + vertex_inputs.getInstance() + " [[ stage_in ]]", stage);
separator = ", ";
}
}
// Add all uniforms
for (const auto& it : stage.getUniformBlocks())
{
const VariableBlock& uniforms = *it.second;
bool isLightData = uniforms.getName() == HW::LIGHT_DATA;
if (!needsLightData && isLightData)
continue;
if (isLightData)
{
emitString(separator, stage);
if (entryFunctionArgs)
{
emitString(_syntax->getUniformQualifier() + " " +
uniforms.getName() + "_" + stage.getName() + "& " +
uniforms.getInstance() +
"[[ buffer(" + std::to_string(buffer_slot++) + ") ]]",
stage);
}
else if (globalContextInit)
{
emitLine(uniforms.getInstance() + "." + uniforms.getInstance(), stage, false);
}
else if (globalContextMembers || globalContextConstructorParams)
{
const string structArraySuffix = "[" + HW::LIGHT_DATA_MAX_LIGHT_SOURCES + "]";
emitLine((globalContextConstructorParams ? (_syntax->getUniformQualifier() + " ") : std::string()) +
uniforms.getName() + " " +
uniforms.getInstance() +
structArraySuffix,
stage, !globalContextConstructorParams);
}
else if (globalContextConstructorInit)
{
const unsigned int maxLights = std::max(1u, context.getOptions().hwMaxActiveLightSources);
emitLine(uniforms.getInstance(), stage, false);
emitScopeBegin(stage);
for (unsigned int l = 0; l < maxLights; ++l)
{
emitString(l == 0 ? "" : ", ", stage);
emitLine(uniforms.getInstance() +
"[" + std::to_string(l) + "]",
stage, false);
}
emitScopeEnd(stage);
}
}
else
{
if (!entryFunctionArgs)
{
if (!uniforms.empty())
{
for (size_t i = 0; i < uniforms.size(); ++i)
{
if (uniforms[i]->getType() != Type::FILENAME)
{
emitLineBegin(stage);
emitString(separator, stage);
if (globalContextInit)
{
emitString(uniforms.getInstance() + "." + uniforms[i]->getVariable(), stage);
}
else if (globalContextMembers || globalContextConstructorParams)
{
emitLine(_syntax->getTypeName(uniforms[i]->getType()) + " " + uniforms[i]->getVariable(), stage, !globalContextConstructorParams);
}
else if (globalContextConstructorInit)
{
emitLine(uniforms[i]->getVariable() + "(" + uniforms[i]->getVariable() + ")", stage, false);
}
emitLineEnd(stage, false);
}
else
{
if (globalContextInit)
{
emitString(separator, stage);
emitString("MetalTexture", stage);
emitScopeBegin(stage);
emitString(TEXTURE_NAME(uniforms[i]->getVariable()), stage);
emitString(separator, stage);
emitString(SAMPLER_NAME(uniforms[i]->getVariable()), stage);
emitScopeEnd(stage);
}
else if (globalContextMembers || globalContextConstructorParams)
{
emitString(separator, stage);
emitVariableDeclaration(uniforms[i], EMPTY_STRING, context, stage, false);
emitString(globalContextConstructorParams ? "" : ";", stage);
}
else if (globalContextConstructorInit)
{
emitString(separator, stage);
emitLine(uniforms[i]->getVariable() + "(" + uniforms[i]->getVariable() + ")", stage, false);
}
}
if (globalContextInit || globalContextConstructorParams || globalContextConstructorInit)
separator = ", ";
else if (globalContextMembers)
separator = "\n";
}
}
}
else
{
if (!uniforms.empty())
{
bool hasUniforms = false;
for (const ShaderPort* uniform : uniforms.getVariableOrder())
{
if (uniform->getType() == Type::FILENAME)
{
emitString(separator, stage);
emitString("texture2d<float> " + TEXTURE_NAME(uniform->getVariable()), stage);
emitString(" [[texture(" + std::to_string(tex_slot) + ")]], ", stage);
emitString("sampler " + SAMPLER_NAME(uniform->getVariable()), stage);
emitString(" [[sampler(" + std::to_string(tex_slot++) + ")]]", stage);
emitLineEnd(stage, false);
}
else
{
hasUniforms = true;
}
}
if (hasUniforms)
{
emitString(separator, stage);
emitString(_syntax->getUniformQualifier() + " " +
uniforms.getName() + "& " +
uniforms.getInstance() +
"[[ buffer(" + std::to_string(buffer_slot++) + ") ]]",
stage);
}
}
}
}
if (globalContextInit || entryFunctionArgs || globalContextConstructorParams || globalContextConstructorInit)
separator = ", ";
else
separator = "\n";
}
if (!isVertexShader)
{
const VariableBlock& outputs = stage.getOutputBlock(HW::PIXEL_OUTPUTS);
for (auto& it : outputs.getVariableOrder())
{
if (globalContextMembers)
{
emitLine(_syntax->getTypeName(it->getType()) + " " + it->getVariable(), stage, true);
}
}
}
};
void MslShaderGenerator::emitVertexStage(const ShaderGraph& graph, GenContext& context, ShaderStage& stage) const
{
HwResourceBindingContextPtr resourceBindingCtx = getResourceBindingContext(context);
emitDirectives(context, stage);
if (resourceBindingCtx)
{
resourceBindingCtx->emitDirectives(context, stage);
}
emitLineBreak(stage);
emitConstantBufferDeclarations(context, resourceBindingCtx, stage);
// Add vertex inputs
emitInputs(context, stage);
// Add vertex data outputs block
emitOutputs(context, stage);
emitLine("struct GlobalContext", stage, false);
emitScopeBegin(stage);
{
emitLine("GlobalContext(", stage, false);
emitGlobalVariables(context, stage, EMIT_GLOBAL_SCOPE_CONTEXT_CONSTRUCTOR_ARGS, true, false);
emitLine(") : ", stage, false);
emitGlobalVariables(context, stage, EMIT_GLOBAL_SCOPE_CONTEXT_CONSTRUCTOR_INIT, true, false);
emitLine("{}", stage, false);
emitGlobalVariables(context, stage, EMIT_GLOBAL_SCOPE_CONTEXT_MEMBER_DECL, true, false);
emitFunctionDefinitions(graph, context, stage);
const VariableBlock& vertexData = stage.getOutputBlock(HW::VERTEX_DATA);
emitLine(vertexData.getName() + " VertexMain()", stage, false);
emitScopeBegin(stage);
{
emitLine(vertexData.getName() + " " + vertexData.getInstance(), stage, true);
emitLine("float4 hPositionWorld = " + HW::T_WORLD_MATRIX + " * float4(" + HW::T_IN_POSITION + ", 1.0)", stage);
emitLine(vertexData.getInstance() + ".pos" + " = " + HW::T_VIEW_PROJECTION_MATRIX + " * hPositionWorld", stage);
emitFunctionCalls(graph, context, stage);
emitLineBreak(stage);
emitLine("return " + vertexData.getInstance(), stage, true);
// Emit all function calls in order
for (const ShaderNode* node : graph.getNodes())
{
emitFunctionCall(*node, context, stage);
}
emitFunctionBodyEnd(graph, context, stage);
}
}
emitScopeEnd(stage, true, true);
// Add main function
setFunctionName("VertexMain", stage);
const VariableBlock& vertexData = stage.getOutputBlock(HW::VERTEX_DATA);
emitLine("vertex " + vertexData.getName() + " VertexMain(", stage, false);
emitGlobalVariables(context, stage, EMIT_GLOBAL_SCOPE_CONTEXT_ENTRY_FUNCTION_RESOURCES, true, false);
emitLine(")", stage, false);
emitScopeBegin(stage);
{
emitString("\tGlobalContext ctx {", stage);
emitGlobalVariables(context, stage, EMIT_GLOBAL_SCOPE_CONTEXT_MEMBER_INIT, true, false);
emitLine("}", stage, true);
emitLine(vertexData.getName() + " out = ctx.VertexMain()", stage, true);
emitLine("out.pos.y = -out.pos.y", stage, true);
emitLine("return out", stage, true);
}
emitScopeEnd(stage);
emitLineBreak(stage);
}
void MslShaderGenerator::emitSpecularEnvironment(GenContext& context, ShaderStage& stage) const
{
int specularMethod = context.getOptions().hwSpecularEnvironmentMethod;
if (specularMethod == SPECULAR_ENVIRONMENT_FIS)
{
emitLibraryInclude("pbrlib/genglsl/lib/mx_environment_fis.glsl", context, stage);
}
else if (specularMethod == SPECULAR_ENVIRONMENT_PREFILTER)
{
emitLibraryInclude("pbrlib/genglsl/lib/mx_environment_prefilter.glsl", context, stage);
}
else if (specularMethod == SPECULAR_ENVIRONMENT_NONE)
{
emitLibraryInclude("pbrlib/genglsl/lib/mx_environment_none.glsl", context, stage);
}
else
{
throw ExceptionShaderGenError("Invalid hardware specular environment method specified: '" + std::to_string(specularMethod) + "'");
}
emitLineBreak(stage);
}
void MslShaderGenerator::emitTransmissionRender(GenContext& context, ShaderStage& stage) const
{
int transmissionMethod = context.getOptions().hwTransmissionRenderMethod;
if (transmissionMethod == TRANSMISSION_REFRACTION)
{
emitLibraryInclude("pbrlib/genglsl/lib/mx_transmission_refract.glsl", context, stage);
}
else if (transmissionMethod == TRANSMISSION_OPACITY)
{
emitLibraryInclude("pbrlib/genglsl/lib/mx_transmission_opacity.glsl", context, stage);
}
else
{
throw ExceptionShaderGenError("Invalid transmission render specified: '" + std::to_string(transmissionMethod) + "'");
}
emitLineBreak(stage);
}
void MslShaderGenerator::emitDirectives(GenContext&, ShaderStage& stage) const
{
// Add directives
emitLine("//Metal Shading Language version " + getVersion(), stage, false);
emitLine("#define __METAL__ ", stage, false);
emitLine("#include <metal_stdlib>", stage, false);
emitLine("#include <simd/simd.h>", stage, false);
emitLine("using namespace metal;", stage, false);
emitLine("#define vec2 float2", stage, false);
emitLine("#define vec3 float3", stage, false);
emitLine("#define vec4 float4", stage, false);
emitLine("#define ivec2 int2", stage, false);
emitLine("#define ivec3 int3", stage, false);
emitLine("#define ivec4 int4", stage, false);
emitLine("#define uvec2 uint2", stage, false);
emitLine("#define uvec3 uint3", stage, false);
emitLine("#define uvec4 uint4", stage, false);
emitLine("#define bvec2 bool2", stage, false);
emitLine("#define bvec3 bool3", stage, false);
emitLine("#define bvec4 bool4", stage, false);
emitLine("#define mat3 float3x3", stage, false);
emitLine("#define mat4 float4x4", stage, false);
emitLineBreak(stage);
}
void MslShaderGenerator::emitConstants(GenContext& context, ShaderStage& stage) const
{
const VariableBlock& constants = stage.getConstantBlock();
if (!constants.empty())
{
emitVariableDeclarations(constants, _syntax->getUniformQualifier(), Syntax::SEMICOLON, context, stage);
emitLineBreak(stage);
}
}
void MslShaderGenerator::emitConstantBufferDeclarations(GenContext& context,
HwResourceBindingContextPtr resourceBindingCtx,
ShaderStage& stage) const
{
// Add all uniforms
for (const auto& it : stage.getUniformBlocks())
{
const VariableBlock& uniforms = *it.second;
if (!uniforms.empty())
{
if (uniforms.getName() == HW::LIGHT_DATA)
continue;
emitComment("Uniform block: " + uniforms.getName(), stage);
if (resourceBindingCtx)
{
resourceBindingCtx->emitResourceBindings(context, uniforms, stage);
}
else
{
emitVariableDeclarations(uniforms, _syntax->getUniformQualifier(), Syntax::SEMICOLON, context, stage);
emitLineBreak(stage);
}
}
}
}
void MslShaderGenerator::emitMetalTextureClass(GenContext& context, ShaderStage& stage) const
{
emitLibraryInclude("stdlib/genmsl/lib/mx_texture.metal", context, stage);
}
void MslShaderGenerator::emitLightData(GenContext& context, ShaderStage& stage) const
{
const VariableBlock& lightData = stage.getUniformBlock(HW::LIGHT_DATA);
const string structArraySuffix = "[" + HW::LIGHT_DATA_MAX_LIGHT_SOURCES + "]";
const string structName = lightData.getInstance();
HwResourceBindingContextPtr resourceBindingCtx = getResourceBindingContext(context);
if (resourceBindingCtx)
{
resourceBindingCtx->emitStructuredResourceBindings(
context, lightData, stage, structName, structArraySuffix);
}
else
{
emitLine("struct " + lightData.getName(), stage, false);
emitScopeBegin(stage);
emitVariableDeclarations(lightData, EMPTY_STRING, Syntax::SEMICOLON, context, stage, false);
emitScopeEnd(stage, true);
emitLineBreak(stage);
emitLine("uniform " + lightData.getName() + " " + structName + structArraySuffix, stage);
}
emitLineBreak(stage);
}
void MslShaderGenerator::emitInputs(GenContext& context, ShaderStage& stage, const VariableBlock& inputs) const
{
emitComment("Inputs block: " + inputs.getName(), stage);
emitLine("struct " + inputs.getName(), stage, false);
emitScopeBegin(stage);
DEFINE_SHADER_STAGE(stage, Stage::PIXEL)
{
emitLine("float4 pos [[position]]", stage);
}
for (size_t i = 0; i < inputs.size(); ++i)
{
string line = "";
line += context.getShaderGenerator().getSyntax().getTypeName(inputs[i]->getType());
line += " " + inputs[i]->getName() + " ";
DEFINE_SHADER_STAGE(stage, Stage::VERTEX)
{
line += "[[attribute(";
line += std::to_string(i);
line += ")]]";
};
emitLine(line, stage, true);
}
emitScopeEnd(stage, true, false);
emitLineBreak(stage);
}
void MslShaderGenerator::emitInputs(GenContext& context, ShaderStage& stage) const
{
DEFINE_SHADER_STAGE(stage, Stage::VERTEX)
{
const VariableBlock& vertexInputs = stage.getInputBlock(HW::VERTEX_INPUTS);
emitInputs(context, stage, vertexInputs);
}
DEFINE_SHADER_STAGE(stage, Stage::PIXEL)
{
const VariableBlock& vertexData = stage.getInputBlock(HW::VERTEX_DATA);
emitInputs(context, stage, vertexData);
}
}
void MslShaderGenerator::emitOutputs(GenContext& context, ShaderStage& stage) const
{
// Add vertex inputs
auto emitOutputsOfShaderSource = [&](const VariableBlock& outputs)
{
if (!outputs.empty())
{
emitLine("struct " + outputs.getName(), stage, false);
emitScopeBegin(stage);
DEFINE_SHADER_STAGE(stage, Stage::VERTEX)
{
emitLine("float4 pos [[position]]", stage, true);
}
emitVariableDeclarations(outputs, EMPTY_STRING, Syntax::SEMICOLON, context, stage, false);
emitScopeEnd(stage, true, false);
emitLineBreak(stage);
emitLineBreak(stage);
}
else
{
emitLine("struct VertexData", stage, false);
emitScopeBegin(stage);
emitLine("float4 pos [[position]]", stage, true);
emitScopeEnd(stage, true, false);
emitLineBreak(stage);
emitLineBreak(stage);
}
};
DEFINE_SHADER_STAGE(stage, Stage::VERTEX)
{
const VariableBlock& vertexData = stage.getOutputBlock(HW::VERTEX_DATA);
emitOutputsOfShaderSource(vertexData);
}
DEFINE_SHADER_STAGE(stage, Stage::PIXEL)
{
emitComment("Pixel shader outputs", stage);
const VariableBlock& outputs = stage.getOutputBlock(HW::PIXEL_OUTPUTS);
emitOutputsOfShaderSource(outputs);
}
}
HwResourceBindingContextPtr MslShaderGenerator::getResourceBindingContext(GenContext& context) const
{
return context.getUserData<HwResourceBindingContext>(HW::USER_DATA_BINDING_CONTEXT);
}
string MslShaderGenerator::getVertexDataPrefix(const VariableBlock& vertexData) const
{
return vertexData.getInstance() + ".";
}
bool MslShaderGenerator::requiresLighting(const ShaderGraph& graph) const
{
const bool isBsdf = graph.hasClassification(ShaderNode::Classification::BSDF);
const bool isLitSurfaceShader = graph.hasClassification(ShaderNode::Classification::SHADER) &&
graph.hasClassification(ShaderNode::Classification::SURFACE) &&
!graph.hasClassification(ShaderNode::Classification::UNLIT);
return isBsdf || isLitSurfaceShader;
}
void MslShaderGenerator::emitMathMatrixScalarMathOperators(GenContext& context, ShaderStage& stage) const
{
emitLibraryInclude("stdlib/genmsl/lib/mx_matscalaroperators.metal", context, stage);
}
void MslShaderGenerator::emitPixelStage(const ShaderGraph& graph, GenContext& context, ShaderStage& stage) const
{
HwResourceBindingContextPtr resourceBindingCtx = getResourceBindingContext(context);
// Add directives
emitDirectives(context, stage);
if (resourceBindingCtx)
{
resourceBindingCtx->emitDirectives(context, stage);
}
emitLineBreak(stage);
emitMetalTextureClass(context, stage);
// Add type definitions
emitTypeDefinitions(context, stage);
emitConstantBufferDeclarations(context, resourceBindingCtx, stage);
// Add all constants
emitConstants(context, stage);
// Add vertex data inputs block
emitInputs(context, stage);
// Add the pixel shader output. This needs to be a float4 for rendering
// and upstream connection will be converted to float4 if needed in emitFinalOutput()
emitOutputs(context, stage);
// Determine whether lighting is required
bool lighting = requiresLighting(graph);
// Define directional albedo approach
if (lighting || context.getOptions().hwWriteAlbedoTable)
{
emitLine("#define DIRECTIONAL_ALBEDO_METHOD " + std::to_string(int(context.getOptions().hwDirectionalAlbedoMethod)), stage, false);
emitLineBreak(stage);
}
// Add lighting support
if (lighting)
{
if (context.getOptions().hwMaxActiveLightSources > 0)
{
const unsigned int maxLights = std::max(1u, context.getOptions().hwMaxActiveLightSources);
emitLine("#define " + HW::LIGHT_DATA_MAX_LIGHT_SOURCES + " " + std::to_string(maxLights), stage, false);
}
if (context.getOptions().hwMaxActiveLightSources > 0)
{
emitLightData(context, stage);
}
}
bool needsLightBuffer = lighting && context.getOptions().hwMaxActiveLightSources > 0;
emitMathMatrixScalarMathOperators(context, stage);
emitLine("struct GlobalContext", stage, false);
emitScopeBegin(stage);
{
emitLine("GlobalContext(", stage, false);
emitGlobalVariables(context, stage, EMIT_GLOBAL_SCOPE_CONTEXT_CONSTRUCTOR_ARGS, false, needsLightBuffer);
emitLine(") : ", stage, false);
emitGlobalVariables(context, stage, EMIT_GLOBAL_SCOPE_CONTEXT_CONSTRUCTOR_INIT, false, needsLightBuffer);
emitLine("{}", stage, false);
// Add common math functions
emitLine("#define __DECL_GL_MATH_FUNCTIONS__", stage, false);
emitLibraryInclude("stdlib/genmsl/lib/mx_math.metal", context, stage);
emitLineBreak(stage);
if (lighting)
{
emitSpecularEnvironment(context, stage);
emitTransmissionRender(context, stage);
}
emitGlobalVariables(context, stage, EMIT_GLOBAL_SCOPE_CONTEXT_MEMBER_DECL, false, needsLightBuffer);
// Add shadowing support
bool shadowing = (lighting && context.getOptions().hwShadowMap) ||
context.getOptions().hwWriteDepthMoments;
if (shadowing)
{
emitLibraryInclude("pbrlib/genglsl/lib/mx_shadow.glsl", context, stage);
}
// Emit directional albedo table code.
if (context.getOptions().hwWriteAlbedoTable)
{
emitLibraryInclude("pbrlib/genglsl/lib/mx_generate_albedo_table.glsl", context, stage);
emitLineBreak(stage);
}
// Emit environment prefiltering code
if (context.getOptions().hwWriteEnvPrefilter)
{
emitLibraryInclude("pbrlib/genglsl/lib/mx_generate_prefilter_env.glsl", context, stage);
emitLineBreak(stage);
}
// Set the include file to use for uv transformations,
// depending on the vertical flip flag.
if (context.getOptions().fileTextureVerticalFlip)
{
_tokenSubstitutions[ShaderGenerator::T_FILE_TRANSFORM_UV] = "mx_transform_uv_vflip.glsl";
}
else
{
_tokenSubstitutions[ShaderGenerator::T_FILE_TRANSFORM_UV] = "mx_transform_uv.glsl";
}
// Emit uv transform code globally if needed.
if (context.getOptions().hwAmbientOcclusion)
{
emitLibraryInclude("stdlib/genglsl/lib/" + _tokenSubstitutions[ShaderGenerator::T_FILE_TRANSFORM_UV], context, stage);
}
emitLightFunctionDefinitions(graph, context, stage);
// Emit function definitions for all nodes in the graph.
emitFunctionDefinitions(graph, context, stage);
const ShaderGraphOutputSocket* outputSocket = graph.getOutputSocket();
// Add main function
const VariableBlock& outputs = stage.getOutputBlock(HW::PIXEL_OUTPUTS);
emitLine(outputs.getName() + " FragmentMain()", stage, false);
emitFunctionBodyBegin(graph, context, stage);
if (graph.hasClassification(ShaderNode::Classification::CLOSURE) &&
!graph.hasClassification(ShaderNode::Classification::SHADER))
{
// Handle the case where the graph is a direct closure.
// We don't support rendering closures without attaching
// to a surface shader, so just output black.
emitLine(outputSocket->getVariable() + " = float4(0.0, 0.0, 0.0, 1.0)", stage);
}
else if (context.getOptions().hwWriteDepthMoments)
{
emitLine(outputSocket->getVariable() + " = float4(mx_compute_depth_moments(), 0.0, 1.0)", stage);
}
else if (context.getOptions().hwWriteAlbedoTable)