| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkSLMetalCodeGenerator.h" |
| |
| #include "SkSLCompiler.h" |
| #include "ir/SkSLExpressionStatement.h" |
| #include "ir/SkSLExtension.h" |
| #include "ir/SkSLIndexExpression.h" |
| #include "ir/SkSLModifiersDeclaration.h" |
| #include "ir/SkSLNop.h" |
| #include "ir/SkSLVariableReference.h" |
| |
| #ifdef SK_MOLTENVK |
| static const uint32_t MVKMagicNum = 0x19960412; |
| #endif |
| |
| namespace SkSL { |
| |
| void MetalCodeGenerator::setupIntrinsics() { |
| #define METAL(x) std::make_pair(kMetal_IntrinsicKind, k ## x ## _MetalIntrinsic) |
| #define SPECIAL(x) std::make_pair(kSpecial_IntrinsicKind, k ## x ## _SpecialIntrinsic) |
| fIntrinsicMap[String("texture")] = SPECIAL(Texture); |
| fIntrinsicMap[String("mod")] = SPECIAL(Mod); |
| fIntrinsicMap[String("equal")] = METAL(Equal); |
| fIntrinsicMap[String("notEqual")] = METAL(NotEqual); |
| fIntrinsicMap[String("lessThan")] = METAL(LessThan); |
| fIntrinsicMap[String("lessThanEqual")] = METAL(LessThanEqual); |
| fIntrinsicMap[String("greaterThan")] = METAL(GreaterThan); |
| fIntrinsicMap[String("greaterThanEqual")] = METAL(GreaterThanEqual); |
| } |
| |
| void MetalCodeGenerator::write(const char* s) { |
| if (!s[0]) { |
| return; |
| } |
| if (fAtLineStart) { |
| for (int i = 0; i < fIndentation; i++) { |
| fOut->writeText(" "); |
| } |
| } |
| fOut->writeText(s); |
| fAtLineStart = false; |
| } |
| |
| void MetalCodeGenerator::writeLine(const char* s) { |
| this->write(s); |
| fOut->writeText(fLineEnding); |
| fAtLineStart = true; |
| } |
| |
| void MetalCodeGenerator::write(const String& s) { |
| this->write(s.c_str()); |
| } |
| |
| void MetalCodeGenerator::writeLine(const String& s) { |
| this->writeLine(s.c_str()); |
| } |
| |
| void MetalCodeGenerator::writeLine() { |
| this->writeLine(""); |
| } |
| |
| void MetalCodeGenerator::writeExtension(const Extension& ext) { |
| this->writeLine("#extension " + ext.fName + " : enable"); |
| } |
| |
| void MetalCodeGenerator::writeType(const Type& type) { |
| switch (type.kind()) { |
| case Type::kStruct_Kind: |
| for (const Type* search : fWrittenStructs) { |
| if (*search == type) { |
| // already written |
| this->write(type.name()); |
| return; |
| } |
| } |
| fWrittenStructs.push_back(&type); |
| this->writeLine("struct " + type.name() + " {"); |
| fIndentation++; |
| this->writeFields(type.fields(), type.fOffset); |
| fIndentation--; |
| this->write("}"); |
| break; |
| case Type::kVector_Kind: |
| this->writeType(type.componentType()); |
| this->write(to_string(type.columns())); |
| break; |
| case Type::kMatrix_Kind: |
| this->writeType(type.componentType()); |
| this->write(to_string(type.columns())); |
| this->write("x"); |
| this->write(to_string(type.rows())); |
| break; |
| case Type::kSampler_Kind: |
| this->write("texture2d<float> "); // FIXME - support other texture types; |
| break; |
| default: |
| if (type == *fContext.fHalf_Type) { |
| // FIXME - Currently only supporting floats in MSL to avoid type coercion issues. |
| this->write(fContext.fFloat_Type->name()); |
| } else if (type == *fContext.fByte_Type) { |
| this->write("char"); |
| } else if (type == *fContext.fUByte_Type) { |
| this->write("uchar"); |
| } else { |
| this->write(type.name()); |
| } |
| } |
| } |
| |
| void MetalCodeGenerator::writeExpression(const Expression& expr, Precedence parentPrecedence) { |
| switch (expr.fKind) { |
| case Expression::kBinary_Kind: |
| this->writeBinaryExpression((BinaryExpression&) expr, parentPrecedence); |
| break; |
| case Expression::kBoolLiteral_Kind: |
| this->writeBoolLiteral((BoolLiteral&) expr); |
| break; |
| case Expression::kConstructor_Kind: |
| this->writeConstructor((Constructor&) expr, parentPrecedence); |
| break; |
| case Expression::kIntLiteral_Kind: |
| this->writeIntLiteral((IntLiteral&) expr); |
| break; |
| case Expression::kFieldAccess_Kind: |
| this->writeFieldAccess(((FieldAccess&) expr)); |
| break; |
| case Expression::kFloatLiteral_Kind: |
| this->writeFloatLiteral(((FloatLiteral&) expr)); |
| break; |
| case Expression::kFunctionCall_Kind: |
| this->writeFunctionCall((FunctionCall&) expr); |
| break; |
| case Expression::kPrefix_Kind: |
| this->writePrefixExpression((PrefixExpression&) expr, parentPrecedence); |
| break; |
| case Expression::kPostfix_Kind: |
| this->writePostfixExpression((PostfixExpression&) expr, parentPrecedence); |
| break; |
| case Expression::kSetting_Kind: |
| this->writeSetting((Setting&) expr); |
| break; |
| case Expression::kSwizzle_Kind: |
| this->writeSwizzle((Swizzle&) expr); |
| break; |
| case Expression::kVariableReference_Kind: |
| this->writeVariableReference((VariableReference&) expr); |
| break; |
| case Expression::kTernary_Kind: |
| this->writeTernaryExpression((TernaryExpression&) expr, parentPrecedence); |
| break; |
| case Expression::kIndex_Kind: |
| this->writeIndexExpression((IndexExpression&) expr); |
| break; |
| default: |
| ABORT("unsupported expression: %s", expr.description().c_str()); |
| } |
| } |
| |
| void MetalCodeGenerator::writeIntrinsicCall(const FunctionCall& c) { |
| auto i = fIntrinsicMap.find(c.fFunction.fName); |
| SkASSERT(i != fIntrinsicMap.end()); |
| Intrinsic intrinsic = i->second; |
| int32_t intrinsicId = intrinsic.second; |
| switch (intrinsic.first) { |
| case kSpecial_IntrinsicKind: |
| return this->writeSpecialIntrinsic(c, (SpecialIntrinsic) intrinsicId); |
| break; |
| case kMetal_IntrinsicKind: |
| this->writeExpression(*c.fArguments[0], kSequence_Precedence); |
| switch ((MetalIntrinsic) intrinsicId) { |
| case kEqual_MetalIntrinsic: |
| this->write(" == "); |
| break; |
| case kNotEqual_MetalIntrinsic: |
| this->write(" != "); |
| break; |
| case kLessThan_MetalIntrinsic: |
| this->write(" < "); |
| break; |
| case kLessThanEqual_MetalIntrinsic: |
| this->write(" <= "); |
| break; |
| case kGreaterThan_MetalIntrinsic: |
| this->write(" > "); |
| break; |
| case kGreaterThanEqual_MetalIntrinsic: |
| this->write(" >= "); |
| break; |
| default: |
| ABORT("unsupported metal intrinsic kind"); |
| } |
| this->writeExpression(*c.fArguments[1], kSequence_Precedence); |
| break; |
| default: |
| ABORT("unsupported intrinsic kind"); |
| } |
| } |
| |
| void MetalCodeGenerator::writeFunctionCall(const FunctionCall& c) { |
| const auto& entry = fIntrinsicMap.find(c.fFunction.fName); |
| if (entry != fIntrinsicMap.end()) { |
| this->writeIntrinsicCall(c); |
| return; |
| } |
| if (c.fFunction.fBuiltin && "atan" == c.fFunction.fName && 2 == c.fArguments.size()) { |
| this->write("atan2"); |
| } else if (c.fFunction.fBuiltin && "inversesqrt" == c.fFunction.fName) { |
| this->write("rsqrt"); |
| } else if (c.fFunction.fBuiltin && "inverse" == c.fFunction.fName) { |
| SkASSERT(c.fArguments.size() == 1); |
| this->writeInverseHack(*c.fArguments[0]); |
| } else if (c.fFunction.fBuiltin && "dFdx" == c.fFunction.fName) { |
| this->write("dfdx"); |
| } else if (c.fFunction.fBuiltin && "dFdy" == c.fFunction.fName) { |
| // Flipping Y also negates the Y derivatives. |
| this->write((fProgram.fSettings.fFlipY) ? "-dfdy" : "dfdy"); |
| } else { |
| this->writeName(c.fFunction.fName); |
| } |
| this->write("("); |
| const char* separator = ""; |
| if (this->requirements(c.fFunction) & kInputs_Requirement) { |
| this->write("_in"); |
| separator = ", "; |
| } |
| if (this->requirements(c.fFunction) & kOutputs_Requirement) { |
| this->write(separator); |
| this->write("_out"); |
| separator = ", "; |
| } |
| if (this->requirements(c.fFunction) & kUniforms_Requirement) { |
| this->write(separator); |
| this->write("_uniforms"); |
| separator = ", "; |
| } |
| if (this->requirements(c.fFunction) & kGlobals_Requirement) { |
| this->write(separator); |
| this->write("_globals"); |
| separator = ", "; |
| } |
| for (size_t i = 0; i < c.fArguments.size(); ++i) { |
| const Expression& arg = *c.fArguments[i]; |
| this->write(separator); |
| separator = ", "; |
| if (c.fFunction.fParameters[i]->fModifiers.fFlags & Modifiers::kOut_Flag) { |
| this->write("&"); |
| } |
| this->writeExpression(arg, kSequence_Precedence); |
| } |
| this->write(")"); |
| } |
| |
| void MetalCodeGenerator::writeInverseHack(const Expression& mat) { |
| String typeName = mat.fType.name(); |
| String name = typeName + "_inverse"; |
| if (mat.fType == *fContext.fFloat2x2_Type || mat.fType == *fContext.fHalf2x2_Type) { |
| if (fWrittenIntrinsics.find(name) == fWrittenIntrinsics.end()) { |
| fWrittenIntrinsics.insert(name); |
| fExtraFunctions.writeText(( |
| typeName + " " + name + "(" + typeName + " m) {" |
| " return float2x2(m[1][1], -m[0][1], -m[1][0], m[0][0]) * (1/determinant(m));" |
| "}" |
| ).c_str()); |
| } |
| } |
| else if (mat.fType == *fContext.fFloat3x3_Type || mat.fType == *fContext.fHalf3x3_Type) { |
| if (fWrittenIntrinsics.find(name) == fWrittenIntrinsics.end()) { |
| fWrittenIntrinsics.insert(name); |
| fExtraFunctions.writeText(( |
| typeName + " " + name + "(" + typeName + " m) {" |
| " float a00 = m[0][0], a01 = m[0][1], a02 = m[0][2];" |
| " float a10 = m[1][0], a11 = m[1][1], a12 = m[1][2];" |
| " float a20 = m[2][0], a21 = m[2][1], a22 = m[2][2];" |
| " float b01 = a22 * a11 - a12 * a21;" |
| " float b11 = -a22 * a10 + a12 * a20;" |
| " float b21 = a21 * a10 - a11 * a20;" |
| " float det = a00 * b01 + a01 * b11 + a02 * b21;" |
| " return " + typeName + |
| " (b01, (-a22 * a01 + a02 * a21), (a12 * a01 - a02 * a11)," |
| " b11, (a22 * a00 - a02 * a20), (-a12 * a00 + a02 * a10)," |
| " b21, (-a21 * a00 + a01 * a20), (a11 * a00 - a01 * a10)) * " |
| " (1/det);" |
| "}" |
| ).c_str()); |
| } |
| } |
| else if (mat.fType == *fContext.fFloat4x4_Type || mat.fType == *fContext.fHalf4x4_Type) { |
| if (fWrittenIntrinsics.find(name) == fWrittenIntrinsics.end()) { |
| fWrittenIntrinsics.insert(name); |
| fExtraFunctions.writeText(( |
| typeName + " " + name + "(" + typeName + " m) {" |
| " float a00 = m[0][0], a01 = m[0][1], a02 = m[0][2], a03 = m[0][3];" |
| " float a10 = m[1][0], a11 = m[1][1], a12 = m[1][2], a13 = m[1][3];" |
| " float a20 = m[2][0], a21 = m[2][1], a22 = m[2][2], a23 = m[2][3];" |
| " float a30 = m[3][0], a31 = m[3][1], a32 = m[3][2], a33 = m[3][3];" |
| " float b00 = a00 * a11 - a01 * a10;" |
| " float b01 = a00 * a12 - a02 * a10;" |
| " float b02 = a00 * a13 - a03 * a10;" |
| " float b03 = a01 * a12 - a02 * a11;" |
| " float b04 = a01 * a13 - a03 * a11;" |
| " float b05 = a02 * a13 - a03 * a12;" |
| " float b06 = a20 * a31 - a21 * a30;" |
| " float b07 = a20 * a32 - a22 * a30;" |
| " float b08 = a20 * a33 - a23 * a30;" |
| " float b09 = a21 * a32 - a22 * a31;" |
| " float b10 = a21 * a33 - a23 * a31;" |
| " float b11 = a22 * a33 - a23 * a32;" |
| " float det = b00 * b11 - b01 * b10 + b02 * b09 + b03 * b08 - " |
| " b04 * b07 + b05 * b06;" |
| " return " + typeName + "(a11 * b11 - a12 * b10 + a13 * b09," |
| " a02 * b10 - a01 * b11 - a03 * b09," |
| " a31 * b05 - a32 * b04 + a33 * b03," |
| " a22 * b04 - a21 * b05 - a23 * b03," |
| " a12 * b08 - a10 * b11 - a13 * b07," |
| " a00 * b11 - a02 * b08 + a03 * b07," |
| " a32 * b02 - a30 * b05 - a33 * b01," |
| " a20 * b05 - a22 * b02 + a23 * b01," |
| " a10 * b10 - a11 * b08 + a13 * b06," |
| " a01 * b08 - a00 * b10 - a03 * b06," |
| " a30 * b04 - a31 * b02 + a33 * b00," |
| " a21 * b02 - a20 * b04 - a23 * b00," |
| " a11 * b07 - a10 * b09 - a12 * b06," |
| " a00 * b09 - a01 * b07 + a02 * b06," |
| " a31 * b01 - a30 * b03 - a32 * b00," |
| " a20 * b03 - a21 * b01 + a22 * b00) / det;" |
| "}" |
| ).c_str()); |
| } |
| } |
| this->write(name); |
| } |
| |
| void MetalCodeGenerator::writeSpecialIntrinsic(const FunctionCall & c, SpecialIntrinsic kind) { |
| switch (kind) { |
| case kTexture_SpecialIntrinsic: |
| this->writeExpression(*c.fArguments[0], kSequence_Precedence); |
| this->write(".sample("); |
| this->writeExpression(*c.fArguments[0], kSequence_Precedence); |
| this->write(SAMPLER_SUFFIX); |
| this->write(", "); |
| this->writeExpression(*c.fArguments[1], kSequence_Precedence); |
| if (c.fArguments[1]->fType == *fContext.fFloat3_Type) { |
| this->write(".xy)"); // FIXME - add projection functionality |
| } else { |
| SkASSERT(c.fArguments[1]->fType == *fContext.fFloat2_Type); |
| this->write(")"); |
| } |
| break; |
| case kMod_SpecialIntrinsic: |
| // fmod(x, y) in metal calculates x - y * trunc(x / y) instead of x - y * floor(x / y) |
| this->write("(("); |
| this->writeExpression(*c.fArguments[0], kSequence_Precedence); |
| this->write(") - ("); |
| this->writeExpression(*c.fArguments[1], kSequence_Precedence); |
| this->write(") * floor(("); |
| this->writeExpression(*c.fArguments[0], kSequence_Precedence); |
| this->write(") / ("); |
| this->writeExpression(*c.fArguments[1], kSequence_Precedence); |
| this->write(")))"); |
| break; |
| default: |
| ABORT("unsupported special intrinsic kind"); |
| } |
| } |
| |
| // If it hasn't already been written, writes a constructor for 'matrix' which takes a single value |
| // of type 'arg'. |
| String MetalCodeGenerator::getMatrixConstructHelper(const Type& matrix, const Type& arg) { |
| String key = matrix.name() + arg.name(); |
| auto found = fHelpers.find(key); |
| if (found != fHelpers.end()) { |
| return found->second; |
| } |
| String name; |
| int columns = matrix.columns(); |
| int rows = matrix.rows(); |
| if (arg.isNumber()) { |
| // creating a matrix from a single scalar value |
| name = "float" + to_string(columns) + "x" + to_string(rows) + "_from_float"; |
| fExtraFunctions.printf("float%dx%d %s(float x) {\n", |
| columns, rows, name.c_str()); |
| fExtraFunctions.printf(" return float%dx%d(", columns, rows); |
| for (int i = 0; i < columns; ++i) { |
| if (i > 0) { |
| fExtraFunctions.writeText(", "); |
| } |
| fExtraFunctions.printf("float%d(", rows); |
| for (int j = 0; j < rows; ++j) { |
| if (j > 0) { |
| fExtraFunctions.writeText(", "); |
| } |
| if (i == j) { |
| fExtraFunctions.writeText("x"); |
| } else { |
| fExtraFunctions.writeText("0"); |
| } |
| } |
| fExtraFunctions.writeText(")"); |
| } |
| fExtraFunctions.writeText(");\n}\n"); |
| } else if (arg.kind() == Type::kMatrix_Kind) { |
| // creating a matrix from another matrix |
| int argColumns = arg.columns(); |
| int argRows = arg.rows(); |
| name = "float" + to_string(columns) + "x" + to_string(rows) + "_from_float" + |
| to_string(argColumns) + "x" + to_string(argRows); |
| fExtraFunctions.printf("float%dx%d %s(float%dx%d m) {\n", |
| columns, rows, name.c_str(), argColumns, argRows); |
| fExtraFunctions.printf(" return float%dx%d(", columns, rows); |
| for (int i = 0; i < columns; ++i) { |
| if (i > 0) { |
| fExtraFunctions.writeText(", "); |
| } |
| fExtraFunctions.printf("float%d(", rows); |
| for (int j = 0; j < rows; ++j) { |
| if (j > 0) { |
| fExtraFunctions.writeText(", "); |
| } |
| if (i < argColumns && j < argRows) { |
| fExtraFunctions.printf("m[%d][%d]", i, j); |
| } else { |
| fExtraFunctions.writeText("0"); |
| } |
| } |
| fExtraFunctions.writeText(")"); |
| } |
| fExtraFunctions.writeText(");\n}\n"); |
| } else if (matrix.rows() == 2 && matrix.columns() == 2 && arg == *fContext.fFloat4_Type) { |
| // float2x2(float4) doesn't work, need to split it into float2x2(float2, float2) |
| name = "float2x2_from_float4"; |
| fExtraFunctions.printf( |
| "float2x2 %s(float4 v) {\n" |
| " return float2x2(float2(v[0], v[1]), float2(v[2], v[3]));\n" |
| "}\n", |
| name.c_str() |
| ); |
| } else { |
| SkASSERT(false); |
| name = "<error>"; |
| } |
| fHelpers[key] = name; |
| return name; |
| } |
| |
| bool MetalCodeGenerator::canCoerce(const Type& t1, const Type& t2) { |
| if (t1.columns() != t2.columns() || t1.rows() != t2.rows()) { |
| return false; |
| } |
| if (t1.columns() > 1) { |
| return this->canCoerce(t1.componentType(), t2.componentType()); |
| } |
| return t1.isFloat() && t2.isFloat(); |
| } |
| |
| void MetalCodeGenerator::writeConstructor(const Constructor& c, Precedence parentPrecedence) { |
| if (c.fArguments.size() == 1 && this->canCoerce(c.fType, c.fArguments[0]->fType)) { |
| this->writeExpression(*c.fArguments[0], parentPrecedence); |
| return; |
| } |
| if (c.fType.kind() == Type::kMatrix_Kind && c.fArguments.size() == 1) { |
| const Expression& arg = *c.fArguments[0]; |
| String name = this->getMatrixConstructHelper(c.fType, arg.fType); |
| this->write(name); |
| this->write("("); |
| this->writeExpression(arg, kSequence_Precedence); |
| this->write(")"); |
| } else { |
| this->writeType(c.fType); |
| this->write("("); |
| const char* separator = ""; |
| int scalarCount = 0; |
| for (const auto& arg : c.fArguments) { |
| this->write(separator); |
| separator = ", "; |
| if (Type::kMatrix_Kind == c.fType.kind() && arg->fType.columns() != c.fType.rows()) { |
| // merge scalars and smaller vectors together |
| if (!scalarCount) { |
| this->writeType(c.fType.componentType()); |
| this->write(to_string(c.fType.rows())); |
| this->write("("); |
| } |
| scalarCount += arg->fType.columns(); |
| } |
| this->writeExpression(*arg, kSequence_Precedence); |
| if (scalarCount && scalarCount == c.fType.rows()) { |
| this->write(")"); |
| scalarCount = 0; |
| } |
| } |
| this->write(")"); |
| } |
| } |
| |
| void MetalCodeGenerator::writeFragCoord() { |
| if (fProgram.fInputs.fRTHeight) { |
| this->write("float4(_fragCoord.x, _anonInterface0.u_skRTHeight - _fragCoord.y, 0.0, " |
| "_fragCoord.w)"); |
| } else { |
| this->write("float4(_fragCoord.x, _fragCoord.y, 0.0, _fragCoord.w)"); |
| } |
| } |
| |
| void MetalCodeGenerator::writeVariableReference(const VariableReference& ref) { |
| switch (ref.fVariable.fModifiers.fLayout.fBuiltin) { |
| case SK_FRAGCOLOR_BUILTIN: |
| this->write("_out->sk_FragColor"); |
| break; |
| case SK_FRAGCOORD_BUILTIN: |
| this->writeFragCoord(); |
| break; |
| case SK_VERTEXID_BUILTIN: |
| this->write("sk_VertexID"); |
| break; |
| case SK_INSTANCEID_BUILTIN: |
| this->write("sk_InstanceID"); |
| break; |
| case SK_CLOCKWISE_BUILTIN: |
| // We'd set the front facing winding in the MTLRenderCommandEncoder to be counter |
| // clockwise to match Skia convention. This is also the default in MoltenVK. |
| this->write(fProgram.fSettings.fFlipY ? "_frontFacing" : "(!_frontFacing)"); |
| break; |
| default: |
| if (Variable::kGlobal_Storage == ref.fVariable.fStorage) { |
| if (ref.fVariable.fModifiers.fFlags & Modifiers::kIn_Flag) { |
| this->write("_in."); |
| } else if (ref.fVariable.fModifiers.fFlags & Modifiers::kOut_Flag) { |
| this->write("_out->"); |
| } else if (ref.fVariable.fModifiers.fFlags & Modifiers::kUniform_Flag && |
| ref.fVariable.fType.kind() != Type::kSampler_Kind) { |
| this->write("_uniforms."); |
| } else { |
| this->write("_globals->"); |
| } |
| } |
| this->writeName(ref.fVariable.fName); |
| } |
| } |
| |
| void MetalCodeGenerator::writeIndexExpression(const IndexExpression& expr) { |
| this->writeExpression(*expr.fBase, kPostfix_Precedence); |
| this->write("["); |
| this->writeExpression(*expr.fIndex, kTopLevel_Precedence); |
| this->write("]"); |
| } |
| |
| void MetalCodeGenerator::writeFieldAccess(const FieldAccess& f) { |
| const Type::Field* field = &f.fBase->fType.fields()[f.fFieldIndex]; |
| if (FieldAccess::kDefault_OwnerKind == f.fOwnerKind) { |
| this->writeExpression(*f.fBase, kPostfix_Precedence); |
| this->write("."); |
| } |
| switch (field->fModifiers.fLayout.fBuiltin) { |
| case SK_CLIPDISTANCE_BUILTIN: |
| this->write("gl_ClipDistance"); |
| break; |
| case SK_POSITION_BUILTIN: |
| this->write("_out->sk_Position"); |
| break; |
| default: |
| if (field->fName == "sk_PointSize") { |
| this->write("_out->sk_PointSize"); |
| } else { |
| if (FieldAccess::kAnonymousInterfaceBlock_OwnerKind == f.fOwnerKind) { |
| this->write("_globals->"); |
| this->write(fInterfaceBlockNameMap[fInterfaceBlockMap[field]]); |
| this->write("->"); |
| } |
| this->writeName(field->fName); |
| } |
| } |
| } |
| |
| void MetalCodeGenerator::writeSwizzle(const Swizzle& swizzle) { |
| int last = swizzle.fComponents.back(); |
| if (last == SKSL_SWIZZLE_0 || last == SKSL_SWIZZLE_1) { |
| this->writeType(swizzle.fType); |
| this->write("("); |
| } |
| this->writeExpression(*swizzle.fBase, kPostfix_Precedence); |
| this->write("."); |
| for (int c : swizzle.fComponents) { |
| if (c >= 0) { |
| this->write(&("x\0y\0z\0w\0"[c * 2])); |
| } |
| } |
| if (last == SKSL_SWIZZLE_0) { |
| this->write(", 0)"); |
| } |
| else if (last == SKSL_SWIZZLE_1) { |
| this->write(", 1)"); |
| } |
| } |
| |
| MetalCodeGenerator::Precedence MetalCodeGenerator::GetBinaryPrecedence(Token::Kind op) { |
| switch (op) { |
| case Token::STAR: // fall through |
| case Token::SLASH: // fall through |
| case Token::PERCENT: return MetalCodeGenerator::kMultiplicative_Precedence; |
| case Token::PLUS: // fall through |
| case Token::MINUS: return MetalCodeGenerator::kAdditive_Precedence; |
| case Token::SHL: // fall through |
| case Token::SHR: return MetalCodeGenerator::kShift_Precedence; |
| case Token::LT: // fall through |
| case Token::GT: // fall through |
| case Token::LTEQ: // fall through |
| case Token::GTEQ: return MetalCodeGenerator::kRelational_Precedence; |
| case Token::EQEQ: // fall through |
| case Token::NEQ: return MetalCodeGenerator::kEquality_Precedence; |
| case Token::BITWISEAND: return MetalCodeGenerator::kBitwiseAnd_Precedence; |
| case Token::BITWISEXOR: return MetalCodeGenerator::kBitwiseXor_Precedence; |
| case Token::BITWISEOR: return MetalCodeGenerator::kBitwiseOr_Precedence; |
| case Token::LOGICALAND: return MetalCodeGenerator::kLogicalAnd_Precedence; |
| case Token::LOGICALXOR: return MetalCodeGenerator::kLogicalXor_Precedence; |
| case Token::LOGICALOR: return MetalCodeGenerator::kLogicalOr_Precedence; |
| case Token::EQ: // fall through |
| case Token::PLUSEQ: // fall through |
| case Token::MINUSEQ: // fall through |
| case Token::STAREQ: // fall through |
| case Token::SLASHEQ: // fall through |
| case Token::PERCENTEQ: // fall through |
| case Token::SHLEQ: // fall through |
| case Token::SHREQ: // fall through |
| case Token::LOGICALANDEQ: // fall through |
| case Token::LOGICALXOREQ: // fall through |
| case Token::LOGICALOREQ: // fall through |
| case Token::BITWISEANDEQ: // fall through |
| case Token::BITWISEXOREQ: // fall through |
| case Token::BITWISEOREQ: return MetalCodeGenerator::kAssignment_Precedence; |
| case Token::COMMA: return MetalCodeGenerator::kSequence_Precedence; |
| default: ABORT("unsupported binary operator"); |
| } |
| } |
| |
| void MetalCodeGenerator::writeMatrixTimesEqualHelper(const Type& left, const Type& right, |
| const Type& result) { |
| String key = "TimesEqual" + left.name() + right.name(); |
| if (fHelpers.find(key) == fHelpers.end()) { |
| fExtraFunctions.printf("%s operator*=(thread %s& left, thread const %s& right) {\n" |
| " left = left * right;\n" |
| " return left;\n" |
| "}", result.name().c_str(), left.name().c_str(), |
| right.name().c_str()); |
| } |
| } |
| |
| void MetalCodeGenerator::writeBinaryExpression(const BinaryExpression& b, |
| Precedence parentPrecedence) { |
| Precedence precedence = GetBinaryPrecedence(b.fOperator); |
| bool needParens = precedence >= parentPrecedence; |
| switch (b.fOperator) { |
| case Token::EQEQ: |
| if (b.fLeft->fType.kind() == Type::kVector_Kind) { |
| this->write("all"); |
| needParens = true; |
| } |
| break; |
| case Token::NEQ: |
| if (b.fLeft->fType.kind() == Type::kVector_Kind) { |
| this->write("any"); |
| needParens = true; |
| } |
| break; |
| default: |
| break; |
| } |
| if (needParens) { |
| this->write("("); |
| } |
| if (Compiler::IsAssignment(b.fOperator) && |
| Expression::kVariableReference_Kind == b.fLeft->fKind && |
| Variable::kParameter_Storage == ((VariableReference&) *b.fLeft).fVariable.fStorage && |
| (((VariableReference&) *b.fLeft).fVariable.fModifiers.fFlags & Modifiers::kOut_Flag)) { |
| // writing to an out parameter. Since we have to turn those into pointers, we have to |
| // dereference it here. |
| this->write("*"); |
| } |
| if (b.fOperator == Token::STAREQ && b.fLeft->fType.kind() == Type::kMatrix_Kind && |
| b.fRight->fType.kind() == Type::kMatrix_Kind) { |
| this->writeMatrixTimesEqualHelper(b.fLeft->fType, b.fRight->fType, b.fType); |
| } |
| this->writeExpression(*b.fLeft, precedence); |
| if (b.fOperator != Token::EQ && Compiler::IsAssignment(b.fOperator) && |
| Expression::kSwizzle_Kind == b.fLeft->fKind && !b.fLeft->hasSideEffects()) { |
| // This doesn't compile in Metal: |
| // float4 x = float4(1); |
| // x.xy *= float2x2(...); |
| // with the error message "non-const reference cannot bind to vector element", |
| // but switching it to x.xy = x.xy * float2x2(...) fixes it. We perform this tranformation |
| // as long as the LHS has no side effects, and hope for the best otherwise. |
| this->write(" = "); |
| this->writeExpression(*b.fLeft, kAssignment_Precedence); |
| this->write(" "); |
| String op = Compiler::OperatorName(b.fOperator); |
| SkASSERT(op.endsWith("=")); |
| this->write(op.substr(0, op.size() - 1).c_str()); |
| this->write(" "); |
| } else { |
| this->write(String(" ") + Compiler::OperatorName(b.fOperator) + " "); |
| } |
| this->writeExpression(*b.fRight, precedence); |
| if (needParens) { |
| this->write(")"); |
| } |
| } |
| |
| void MetalCodeGenerator::writeTernaryExpression(const TernaryExpression& t, |
| Precedence parentPrecedence) { |
| if (kTernary_Precedence >= parentPrecedence) { |
| this->write("("); |
| } |
| this->writeExpression(*t.fTest, kTernary_Precedence); |
| this->write(" ? "); |
| this->writeExpression(*t.fIfTrue, kTernary_Precedence); |
| this->write(" : "); |
| this->writeExpression(*t.fIfFalse, kTernary_Precedence); |
| if (kTernary_Precedence >= parentPrecedence) { |
| this->write(")"); |
| } |
| } |
| |
| void MetalCodeGenerator::writePrefixExpression(const PrefixExpression& p, |
| Precedence parentPrecedence) { |
| if (kPrefix_Precedence >= parentPrecedence) { |
| this->write("("); |
| } |
| this->write(Compiler::OperatorName(p.fOperator)); |
| this->writeExpression(*p.fOperand, kPrefix_Precedence); |
| if (kPrefix_Precedence >= parentPrecedence) { |
| this->write(")"); |
| } |
| } |
| |
| void MetalCodeGenerator::writePostfixExpression(const PostfixExpression& p, |
| Precedence parentPrecedence) { |
| if (kPostfix_Precedence >= parentPrecedence) { |
| this->write("("); |
| } |
| this->writeExpression(*p.fOperand, kPostfix_Precedence); |
| this->write(Compiler::OperatorName(p.fOperator)); |
| if (kPostfix_Precedence >= parentPrecedence) { |
| this->write(")"); |
| } |
| } |
| |
| void MetalCodeGenerator::writeBoolLiteral(const BoolLiteral& b) { |
| this->write(b.fValue ? "true" : "false"); |
| } |
| |
| void MetalCodeGenerator::writeIntLiteral(const IntLiteral& i) { |
| if (i.fType == *fContext.fUInt_Type) { |
| this->write(to_string(i.fValue & 0xffffffff) + "u"); |
| } else { |
| this->write(to_string((int32_t) i.fValue)); |
| } |
| } |
| |
| void MetalCodeGenerator::writeFloatLiteral(const FloatLiteral& f) { |
| this->write(to_string(f.fValue)); |
| } |
| |
| void MetalCodeGenerator::writeSetting(const Setting& s) { |
| ABORT("internal error; setting was not folded to a constant during compilation\n"); |
| } |
| |
| void MetalCodeGenerator::writeFunction(const FunctionDefinition& f) { |
| const char* separator = ""; |
| if ("main" == f.fDeclaration.fName) { |
| switch (fProgram.fKind) { |
| case Program::kFragment_Kind: |
| #ifdef SK_MOLTENVK |
| this->write("fragment Outputs main0"); |
| #else |
| this->write("fragment Outputs fragmentMain"); |
| #endif |
| break; |
| case Program::kVertex_Kind: |
| #ifdef SK_MOLTENVK |
| this->write("vertex Outputs main0"); |
| #else |
| this->write("vertex Outputs vertexMain"); |
| #endif |
| break; |
| default: |
| SkASSERT(false); |
| } |
| this->write("(Inputs _in [[stage_in]]"); |
| if (-1 != fUniformBuffer) { |
| this->write(", constant Uniforms& _uniforms [[buffer(" + |
| to_string(fUniformBuffer) + ")]]"); |
| } |
| for (const auto& e : fProgram) { |
| if (ProgramElement::kVar_Kind == e.fKind) { |
| VarDeclarations& decls = (VarDeclarations&) e; |
| if (!decls.fVars.size()) { |
| continue; |
| } |
| for (const auto& stmt: decls.fVars) { |
| VarDeclaration& var = (VarDeclaration&) *stmt; |
| if (var.fVar->fType.kind() == Type::kSampler_Kind) { |
| this->write(", texture2d<float> "); // FIXME - support other texture types |
| this->writeName(var.fVar->fName); |
| this->write("[[texture("); |
| this->write(to_string(var.fVar->fModifiers.fLayout.fBinding)); |
| this->write(")]]"); |
| this->write(", sampler "); |
| this->writeName(var.fVar->fName); |
| this->write(SAMPLER_SUFFIX); |
| this->write("[[sampler("); |
| this->write(to_string(var.fVar->fModifiers.fLayout.fBinding)); |
| this->write(")]]"); |
| } |
| } |
| } else if (ProgramElement::kInterfaceBlock_Kind == e.fKind) { |
| InterfaceBlock& intf = (InterfaceBlock&) e; |
| if ("sk_PerVertex" == intf.fTypeName) { |
| continue; |
| } |
| this->write(", constant "); |
| this->writeType(intf.fVariable.fType); |
| this->write("& " ); |
| this->write(fInterfaceBlockNameMap[&intf]); |
| this->write(" [[buffer("); |
| #ifdef SK_MOLTENVK |
| this->write(to_string(intf.fVariable.fModifiers.fLayout.fSet)); |
| #else |
| this->write(to_string(intf.fVariable.fModifiers.fLayout.fBinding)); |
| #endif |
| this->write(")]]"); |
| } |
| } |
| if (fProgram.fKind == Program::kFragment_Kind) { |
| if (fProgram.fInputs.fRTHeight && fInterfaceBlockNameMap.empty()) { |
| #ifdef SK_MOLTENVK |
| this->write(", constant sksl_synthetic_uniforms& _anonInterface0 [[buffer(0)]]"); |
| #else |
| this->write(", constant sksl_synthetic_uniforms& _anonInterface0 [[buffer(1)]]"); |
| #endif |
| } |
| this->write(", bool _frontFacing [[front_facing]]"); |
| this->write(", float4 _fragCoord [[position]]"); |
| } else if (fProgram.fKind == Program::kVertex_Kind) { |
| this->write(", uint sk_VertexID [[vertex_id]], uint sk_InstanceID [[instance_id]]"); |
| } |
| separator = ", "; |
| } else { |
| this->writeType(f.fDeclaration.fReturnType); |
| this->write(" "); |
| this->writeName(f.fDeclaration.fName); |
| this->write("("); |
| if (this->requirements(f.fDeclaration) & kInputs_Requirement) { |
| this->write("Inputs _in"); |
| separator = ", "; |
| } |
| if (this->requirements(f.fDeclaration) & kOutputs_Requirement) { |
| this->write(separator); |
| this->write("thread Outputs* _out"); |
| separator = ", "; |
| } |
| if (this->requirements(f.fDeclaration) & kUniforms_Requirement) { |
| this->write(separator); |
| this->write("Uniforms _uniforms"); |
| separator = ", "; |
| } |
| if (this->requirements(f.fDeclaration) & kGlobals_Requirement) { |
| this->write(separator); |
| this->write("thread Globals* _globals"); |
| separator = ", "; |
| } |
| } |
| for (const auto& param : f.fDeclaration.fParameters) { |
| this->write(separator); |
| separator = ", "; |
| this->writeModifiers(param->fModifiers, false); |
| std::vector<int> sizes; |
| const Type* type = ¶m->fType; |
| while (Type::kArray_Kind == type->kind()) { |
| sizes.push_back(type->columns()); |
| type = &type->componentType(); |
| } |
| this->writeType(*type); |
| if (param->fModifiers.fFlags & Modifiers::kOut_Flag) { |
| this->write("*"); |
| } |
| this->write(" "); |
| this->writeName(param->fName); |
| for (int s : sizes) { |
| if (s <= 0) { |
| this->write("[]"); |
| } else { |
| this->write("[" + to_string(s) + "]"); |
| } |
| } |
| } |
| this->writeLine(") {"); |
| |
| SkASSERT(!fProgram.fSettings.fFragColorIsInOut); |
| |
| if ("main" == f.fDeclaration.fName) { |
| if (fNeedsGlobalStructInit) { |
| this->writeLine(" Globals globalStruct;"); |
| this->writeLine(" thread Globals* _globals = &globalStruct;"); |
| for (const auto& intf: fInterfaceBlockNameMap) { |
| const auto& intfName = intf.second; |
| this->write(" _globals->"); |
| this->writeName(intfName); |
| this->write(" = &"); |
| this->writeName(intfName); |
| this->write(";\n"); |
| } |
| for (const auto& var: fInitNonConstGlobalVars) { |
| this->write(" _globals->"); |
| this->writeName(var->fVar->fName); |
| this->write(" = "); |
| this->writeVarInitializer(*var->fVar, *var->fValue); |
| this->writeLine(";"); |
| } |
| for (const auto& texture: fTextures) { |
| this->write(" _globals->"); |
| this->writeName(texture->fName); |
| this->write(" = "); |
| this->writeName(texture->fName); |
| this->write(";\n"); |
| this->write(" _globals->"); |
| this->writeName(texture->fName); |
| this->write(SAMPLER_SUFFIX); |
| this->write(" = "); |
| this->writeName(texture->fName); |
| this->write(SAMPLER_SUFFIX); |
| this->write(";\n"); |
| } |
| } |
| this->writeLine(" Outputs _outputStruct;"); |
| this->writeLine(" thread Outputs* _out = &_outputStruct;"); |
| } |
| fFunctionHeader = ""; |
| OutputStream* oldOut = fOut; |
| StringStream buffer; |
| fOut = &buffer; |
| fIndentation++; |
| this->writeStatements(((Block&) *f.fBody).fStatements); |
| if ("main" == f.fDeclaration.fName) { |
| switch (fProgram.fKind) { |
| case Program::kFragment_Kind: |
| this->writeLine("return *_out;"); |
| break; |
| case Program::kVertex_Kind: |
| this->writeLine("_out->sk_Position.y = -_out->sk_Position.y;"); |
| this->writeLine("return *_out;"); // FIXME - detect if function already has return |
| break; |
| default: |
| SkASSERT(false); |
| } |
| } |
| fIndentation--; |
| this->writeLine("}"); |
| |
| fOut = oldOut; |
| this->write(fFunctionHeader); |
| this->write(buffer.str()); |
| } |
| |
| void MetalCodeGenerator::writeModifiers(const Modifiers& modifiers, |
| bool globalContext) { |
| if (modifiers.fFlags & Modifiers::kOut_Flag) { |
| this->write("thread "); |
| } |
| if (modifiers.fFlags & Modifiers::kConst_Flag) { |
| this->write("constant "); |
| } |
| } |
| |
| void MetalCodeGenerator::writeInterfaceBlock(const InterfaceBlock& intf) { |
| if ("sk_PerVertex" == intf.fTypeName) { |
| return; |
| } |
| this->writeModifiers(intf.fVariable.fModifiers, true); |
| this->write("struct "); |
| this->writeLine(intf.fTypeName + " {"); |
| const Type* structType = &intf.fVariable.fType; |
| fWrittenStructs.push_back(structType); |
| while (Type::kArray_Kind == structType->kind()) { |
| structType = &structType->componentType(); |
| } |
| fIndentation++; |
| writeFields(structType->fields(), structType->fOffset, &intf); |
| if (fProgram.fInputs.fRTHeight) { |
| this->writeLine("float u_skRTHeight;"); |
| } |
| fIndentation--; |
| this->write("}"); |
| if (intf.fInstanceName.size()) { |
| this->write(" "); |
| this->write(intf.fInstanceName); |
| for (const auto& size : intf.fSizes) { |
| this->write("["); |
| if (size) { |
| this->writeExpression(*size, kTopLevel_Precedence); |
| } |
| this->write("]"); |
| } |
| fInterfaceBlockNameMap[&intf] = intf.fInstanceName; |
| } else { |
| fInterfaceBlockNameMap[&intf] = "_anonInterface" + to_string(fAnonInterfaceCount++); |
| } |
| this->writeLine(";"); |
| } |
| |
| void MetalCodeGenerator::writeFields(const std::vector<Type::Field>& fields, int parentOffset, |
| const InterfaceBlock* parentIntf) { |
| #ifdef SK_MOLTENVK |
| MemoryLayout memoryLayout(MemoryLayout::k140_Standard); |
| #else |
| MemoryLayout memoryLayout(MemoryLayout::kMetal_Standard); |
| #endif |
| int currentOffset = 0; |
| for (const auto& field: fields) { |
| int fieldOffset = field.fModifiers.fLayout.fOffset; |
| const Type* fieldType = field.fType; |
| if (fieldOffset != -1) { |
| if (currentOffset > fieldOffset) { |
| fErrors.error(parentOffset, |
| "offset of field '" + field.fName + "' must be at least " + |
| to_string((int) currentOffset)); |
| } else if (currentOffset < fieldOffset) { |
| this->write("char pad"); |
| this->write(to_string(fPaddingCount++)); |
| this->write("["); |
| this->write(to_string(fieldOffset - currentOffset)); |
| this->writeLine("];"); |
| currentOffset = fieldOffset; |
| } |
| int alignment = memoryLayout.alignment(*fieldType); |
| if (fieldOffset % alignment) { |
| fErrors.error(parentOffset, |
| "offset of field '" + field.fName + "' must be a multiple of " + |
| to_string((int) alignment)); |
| } |
| } |
| #ifdef SK_MOLTENVK |
| if (fieldType->kind() == Type::kVector_Kind && |
| fieldType->columns() == 3) { |
| SkASSERT(memoryLayout.size(*fieldType) == 3); |
| // Pack all vec3 types so that their size in bytes will match what was expected in the |
| // original SkSL code since MSL has vec3 sizes equal to 4 * component type, while SkSL |
| // has vec3 equal to 3 * component type. |
| |
| // FIXME - Packed vectors can't be accessed by swizzles, but can be indexed into. A |
| // combination of this being a problem which only occurs when using MoltenVK and the |
| // fact that we haven't swizzled a vec3 yet means that this problem hasn't been |
| // addressed. |
| this->write(PACKED_PREFIX); |
| } |
| #endif |
| currentOffset += memoryLayout.size(*fieldType); |
| std::vector<int> sizes; |
| while (fieldType->kind() == Type::kArray_Kind) { |
| sizes.push_back(fieldType->columns()); |
| fieldType = &fieldType->componentType(); |
| } |
| this->writeModifiers(field.fModifiers, false); |
| this->writeType(*fieldType); |
| this->write(" "); |
| this->writeName(field.fName); |
| for (int s : sizes) { |
| if (s <= 0) { |
| this->write("[]"); |
| } else { |
| this->write("[" + to_string(s) + "]"); |
| } |
| } |
| this->writeLine(";"); |
| if (parentIntf) { |
| fInterfaceBlockMap[&field] = parentIntf; |
| } |
| } |
| } |
| |
| void MetalCodeGenerator::writeVarInitializer(const Variable& var, const Expression& value) { |
| this->writeExpression(value, kTopLevel_Precedence); |
| } |
| |
| void MetalCodeGenerator::writeName(const String& name) { |
| if (fReservedWords.find(name) != fReservedWords.end()) { |
| this->write("_"); // adding underscore before name to avoid conflict with reserved words |
| } |
| this->write(name); |
| } |
| |
| void MetalCodeGenerator::writeVarDeclarations(const VarDeclarations& decl, bool global) { |
| SkASSERT(decl.fVars.size() > 0); |
| bool wroteType = false; |
| for (const auto& stmt : decl.fVars) { |
| VarDeclaration& var = (VarDeclaration&) *stmt; |
| if (global && !(var.fVar->fModifiers.fFlags & Modifiers::kConst_Flag)) { |
| continue; |
| } |
| if (wroteType) { |
| this->write(", "); |
| } else { |
| this->writeModifiers(var.fVar->fModifiers, global); |
| this->writeType(decl.fBaseType); |
| this->write(" "); |
| wroteType = true; |
| } |
| this->writeName(var.fVar->fName); |
| for (const auto& size : var.fSizes) { |
| this->write("["); |
| if (size) { |
| this->writeExpression(*size, kTopLevel_Precedence); |
| } |
| this->write("]"); |
| } |
| if (var.fValue) { |
| this->write(" = "); |
| this->writeVarInitializer(*var.fVar, *var.fValue); |
| } |
| if (!fFoundImageDecl && var.fVar->fType == *fContext.fImage2D_Type) { |
| if (fProgram.fSettings.fCaps->imageLoadStoreExtensionString()) { |
| fHeader.writeText("#extension "); |
| fHeader.writeText(fProgram.fSettings.fCaps->imageLoadStoreExtensionString()); |
| fHeader.writeText(" : require\n"); |
| } |
| fFoundImageDecl = true; |
| } |
| } |
| if (wroteType) { |
| this->write(";"); |
| } |
| } |
| |
| void MetalCodeGenerator::writeStatement(const Statement& s) { |
| switch (s.fKind) { |
| case Statement::kBlock_Kind: |
| this->writeBlock((Block&) s); |
| break; |
| case Statement::kExpression_Kind: |
| this->writeExpression(*((ExpressionStatement&) s).fExpression, kTopLevel_Precedence); |
| this->write(";"); |
| break; |
| case Statement::kReturn_Kind: |
| this->writeReturnStatement((ReturnStatement&) s); |
| break; |
| case Statement::kVarDeclarations_Kind: |
| this->writeVarDeclarations(*((VarDeclarationsStatement&) s).fDeclaration, false); |
| break; |
| case Statement::kIf_Kind: |
| this->writeIfStatement((IfStatement&) s); |
| break; |
| case Statement::kFor_Kind: |
| this->writeForStatement((ForStatement&) s); |
| break; |
| case Statement::kWhile_Kind: |
| this->writeWhileStatement((WhileStatement&) s); |
| break; |
| case Statement::kDo_Kind: |
| this->writeDoStatement((DoStatement&) s); |
| break; |
| case Statement::kSwitch_Kind: |
| this->writeSwitchStatement((SwitchStatement&) s); |
| break; |
| case Statement::kBreak_Kind: |
| this->write("break;"); |
| break; |
| case Statement::kContinue_Kind: |
| this->write("continue;"); |
| break; |
| case Statement::kDiscard_Kind: |
| this->write("discard_fragment();"); |
| break; |
| case Statement::kNop_Kind: |
| this->write(";"); |
| break; |
| default: |
| ABORT("unsupported statement: %s", s.description().c_str()); |
| } |
| } |
| |
| void MetalCodeGenerator::writeStatements(const std::vector<std::unique_ptr<Statement>>& statements) { |
| for (const auto& s : statements) { |
| if (!s->isEmpty()) { |
| this->writeStatement(*s); |
| this->writeLine(); |
| } |
| } |
| } |
| |
| void MetalCodeGenerator::writeBlock(const Block& b) { |
| this->writeLine("{"); |
| fIndentation++; |
| this->writeStatements(b.fStatements); |
| fIndentation--; |
| this->write("}"); |
| } |
| |
| void MetalCodeGenerator::writeIfStatement(const IfStatement& stmt) { |
| this->write("if ("); |
| this->writeExpression(*stmt.fTest, kTopLevel_Precedence); |
| this->write(") "); |
| this->writeStatement(*stmt.fIfTrue); |
| if (stmt.fIfFalse) { |
| this->write(" else "); |
| this->writeStatement(*stmt.fIfFalse); |
| } |
| } |
| |
| void MetalCodeGenerator::writeForStatement(const ForStatement& f) { |
| this->write("for ("); |
| if (f.fInitializer && !f.fInitializer->isEmpty()) { |
| this->writeStatement(*f.fInitializer); |
| } else { |
| this->write("; "); |
| } |
| if (f.fTest) { |
| this->writeExpression(*f.fTest, kTopLevel_Precedence); |
| } |
| this->write("; "); |
| if (f.fNext) { |
| this->writeExpression(*f.fNext, kTopLevel_Precedence); |
| } |
| this->write(") "); |
| this->writeStatement(*f.fStatement); |
| } |
| |
| void MetalCodeGenerator::writeWhileStatement(const WhileStatement& w) { |
| this->write("while ("); |
| this->writeExpression(*w.fTest, kTopLevel_Precedence); |
| this->write(") "); |
| this->writeStatement(*w.fStatement); |
| } |
| |
| void MetalCodeGenerator::writeDoStatement(const DoStatement& d) { |
| this->write("do "); |
| this->writeStatement(*d.fStatement); |
| this->write(" while ("); |
| this->writeExpression(*d.fTest, kTopLevel_Precedence); |
| this->write(");"); |
| } |
| |
| void MetalCodeGenerator::writeSwitchStatement(const SwitchStatement& s) { |
| this->write("switch ("); |
| this->writeExpression(*s.fValue, kTopLevel_Precedence); |
| this->writeLine(") {"); |
| fIndentation++; |
| for (const auto& c : s.fCases) { |
| if (c->fValue) { |
| this->write("case "); |
| this->writeExpression(*c->fValue, kTopLevel_Precedence); |
| this->writeLine(":"); |
| } else { |
| this->writeLine("default:"); |
| } |
| fIndentation++; |
| for (const auto& stmt : c->fStatements) { |
| this->writeStatement(*stmt); |
| this->writeLine(); |
| } |
| fIndentation--; |
| } |
| fIndentation--; |
| this->write("}"); |
| } |
| |
| void MetalCodeGenerator::writeReturnStatement(const ReturnStatement& r) { |
| this->write("return"); |
| if (r.fExpression) { |
| this->write(" "); |
| this->writeExpression(*r.fExpression, kTopLevel_Precedence); |
| } |
| this->write(";"); |
| } |
| |
| void MetalCodeGenerator::writeHeader() { |
| this->write("#include <metal_stdlib>\n"); |
| this->write("#include <simd/simd.h>\n"); |
| this->write("using namespace metal;\n"); |
| } |
| |
| void MetalCodeGenerator::writeUniformStruct() { |
| for (const auto& e : fProgram) { |
| if (ProgramElement::kVar_Kind == e.fKind) { |
| VarDeclarations& decls = (VarDeclarations&) e; |
| if (!decls.fVars.size()) { |
| continue; |
| } |
| const Variable& first = *((VarDeclaration&) *decls.fVars[0]).fVar; |
| if (first.fModifiers.fFlags & Modifiers::kUniform_Flag && |
| first.fType.kind() != Type::kSampler_Kind) { |
| if (-1 == fUniformBuffer) { |
| this->write("struct Uniforms {\n"); |
| fUniformBuffer = first.fModifiers.fLayout.fSet; |
| if (-1 == fUniformBuffer) { |
| fErrors.error(decls.fOffset, "Metal uniforms must have 'layout(set=...)'"); |
| } |
| } else if (first.fModifiers.fLayout.fSet != fUniformBuffer) { |
| if (-1 == fUniformBuffer) { |
| fErrors.error(decls.fOffset, "Metal backend requires all uniforms to have " |
| "the same 'layout(set=...)'"); |
| } |
| } |
| this->write(" "); |
| this->writeType(first.fType); |
| this->write(" "); |
| for (const auto& stmt : decls.fVars) { |
| VarDeclaration& var = (VarDeclaration&) *stmt; |
| this->writeName(var.fVar->fName); |
| } |
| this->write(";\n"); |
| } |
| } |
| } |
| if (-1 != fUniformBuffer) { |
| this->write("};\n"); |
| } |
| } |
| |
| void MetalCodeGenerator::writeInputStruct() { |
| this->write("struct Inputs {\n"); |
| for (const auto& e : fProgram) { |
| if (ProgramElement::kVar_Kind == e.fKind) { |
| VarDeclarations& decls = (VarDeclarations&) e; |
| if (!decls.fVars.size()) { |
| continue; |
| } |
| const Variable& first = *((VarDeclaration&) *decls.fVars[0]).fVar; |
| if (first.fModifiers.fFlags & Modifiers::kIn_Flag && |
| -1 == first.fModifiers.fLayout.fBuiltin) { |
| this->write(" "); |
| this->writeType(first.fType); |
| this->write(" "); |
| for (const auto& stmt : decls.fVars) { |
| VarDeclaration& var = (VarDeclaration&) *stmt; |
| this->writeName(var.fVar->fName); |
| if (-1 != var.fVar->fModifiers.fLayout.fLocation) { |
| if (fProgram.fKind == Program::kVertex_Kind) { |
| this->write(" [[attribute(" + |
| to_string(var.fVar->fModifiers.fLayout.fLocation) + ")]]"); |
| } else if (fProgram.fKind == Program::kFragment_Kind) { |
| this->write(" [[user(locn" + |
| to_string(var.fVar->fModifiers.fLayout.fLocation) + ")]]"); |
| } |
| } |
| } |
| this->write(";\n"); |
| } |
| } |
| } |
| this->write("};\n"); |
| } |
| |
| void MetalCodeGenerator::writeOutputStruct() { |
| this->write("struct Outputs {\n"); |
| if (fProgram.fKind == Program::kVertex_Kind) { |
| this->write(" float4 sk_Position [[position]];\n"); |
| } else if (fProgram.fKind == Program::kFragment_Kind) { |
| this->write(" float4 sk_FragColor [[color(0)]];\n"); |
| } |
| for (const auto& e : fProgram) { |
| if (ProgramElement::kVar_Kind == e.fKind) { |
| VarDeclarations& decls = (VarDeclarations&) e; |
| if (!decls.fVars.size()) { |
| continue; |
| } |
| const Variable& first = *((VarDeclaration&) *decls.fVars[0]).fVar; |
| if (first.fModifiers.fFlags & Modifiers::kOut_Flag && |
| -1 == first.fModifiers.fLayout.fBuiltin) { |
| this->write(" "); |
| this->writeType(first.fType); |
| this->write(" "); |
| for (const auto& stmt : decls.fVars) { |
| VarDeclaration& var = (VarDeclaration&) *stmt; |
| this->writeName(var.fVar->fName); |
| if (fProgram.fKind == Program::kVertex_Kind) { |
| this->write(" [[user(locn" + |
| to_string(var.fVar->fModifiers.fLayout.fLocation) + ")]]"); |
| } else if (fProgram.fKind == Program::kFragment_Kind) { |
| this->write(" [[color(" + |
| to_string(var.fVar->fModifiers.fLayout.fLocation) +")"); |
| int colorIndex = var.fVar->fModifiers.fLayout.fIndex; |
| if (colorIndex) { |
| this->write(", index(" + to_string(colorIndex) + ")"); |
| } |
| this->write("]]"); |
| } |
| } |
| this->write(";\n"); |
| } |
| } |
| } |
| if (fProgram.fKind == Program::kVertex_Kind) { |
| this->write(" float sk_PointSize;\n"); |
| } |
| this->write("};\n"); |
| } |
| |
| void MetalCodeGenerator::writeInterfaceBlocks() { |
| bool wroteInterfaceBlock = false; |
| for (const auto& e : fProgram) { |
| if (ProgramElement::kInterfaceBlock_Kind == e.fKind) { |
| this->writeInterfaceBlock((InterfaceBlock&) e); |
| wroteInterfaceBlock = true; |
| } |
| } |
| if (!wroteInterfaceBlock && fProgram.fInputs.fRTHeight) { |
| this->writeLine("struct sksl_synthetic_uniforms {"); |
| this->writeLine(" float u_skRTHeight;"); |
| this->writeLine("};"); |
| } |
| } |
| |
| void MetalCodeGenerator::writeGlobalStruct() { |
| bool wroteStructDecl = false; |
| for (const auto& intf : fInterfaceBlockNameMap) { |
| if (!wroteStructDecl) { |
| this->write("struct Globals {\n"); |
| wroteStructDecl = true; |
| } |
| fNeedsGlobalStructInit = true; |
| const auto& intfType = intf.first; |
| const auto& intfName = intf.second; |
| this->write(" constant "); |
| this->write(intfType->fTypeName); |
| this->write("* "); |
| this->writeName(intfName); |
| this->write(";\n"); |
| } |
| for (const auto& e : fProgram) { |
| if (ProgramElement::kVar_Kind == e.fKind) { |
| VarDeclarations& decls = (VarDeclarations&) e; |
| if (!decls.fVars.size()) { |
| continue; |
| } |
| const Variable& first = *((VarDeclaration&) *decls.fVars[0]).fVar; |
| if ((!first.fModifiers.fFlags && -1 == first.fModifiers.fLayout.fBuiltin) || |
| first.fType.kind() == Type::kSampler_Kind) { |
| if (!wroteStructDecl) { |
| this->write("struct Globals {\n"); |
| wroteStructDecl = true; |
| } |
| fNeedsGlobalStructInit = true; |
| this->write(" "); |
| this->writeType(first.fType); |
| this->write(" "); |
| for (const auto& stmt : decls.fVars) { |
| VarDeclaration& var = (VarDeclaration&) *stmt; |
| this->writeName(var.fVar->fName); |
| if (var.fVar->fType.kind() == Type::kSampler_Kind) { |
| fTextures.push_back(var.fVar); |
| this->write(";\n"); |
| this->write(" sampler "); |
| this->writeName(var.fVar->fName); |
| this->write(SAMPLER_SUFFIX); |
| } |
| if (var.fValue) { |
| fInitNonConstGlobalVars.push_back(&var); |
| } |
| } |
| this->write(";\n"); |
| } |
| } |
| } |
| if (wroteStructDecl) { |
| this->write("};\n"); |
| } |
| } |
| |
| void MetalCodeGenerator::writeProgramElement(const ProgramElement& e) { |
| switch (e.fKind) { |
| case ProgramElement::kExtension_Kind: |
| break; |
| case ProgramElement::kVar_Kind: { |
| VarDeclarations& decl = (VarDeclarations&) e; |
| if (decl.fVars.size() > 0) { |
| int builtin = ((VarDeclaration&) *decl.fVars[0]).fVar->fModifiers.fLayout.fBuiltin; |
| if (-1 == builtin) { |
| // normal var |
| this->writeVarDeclarations(decl, true); |
| this->writeLine(); |
| } else if (SK_FRAGCOLOR_BUILTIN == builtin) { |
| // ignore |
| } |
| } |
| break; |
| } |
| case ProgramElement::kInterfaceBlock_Kind: |
| // handled in writeInterfaceBlocks, do nothing |
| break; |
| case ProgramElement::kFunction_Kind: |
| this->writeFunction((FunctionDefinition&) e); |
| break; |
| case ProgramElement::kModifiers_Kind: |
| this->writeModifiers(((ModifiersDeclaration&) e).fModifiers, true); |
| this->writeLine(";"); |
| break; |
| default: |
| printf("%s\n", e.description().c_str()); |
| ABORT("unsupported program element"); |
| } |
| } |
| |
| MetalCodeGenerator::Requirements MetalCodeGenerator::requirements(const Expression& e) { |
| switch (e.fKind) { |
| case Expression::kFunctionCall_Kind: { |
| const FunctionCall& f = (const FunctionCall&) e; |
| Requirements result = this->requirements(f.fFunction); |
| for (const auto& e : f.fArguments) { |
| result |= this->requirements(*e); |
| } |
| return result; |
| } |
| case Expression::kConstructor_Kind: { |
| const Constructor& c = (const Constructor&) e; |
| Requirements result = kNo_Requirements; |
| for (const auto& e : c.fArguments) { |
| result |= this->requirements(*e); |
| } |
| return result; |
| } |
| case Expression::kFieldAccess_Kind: { |
| const FieldAccess& f = (const FieldAccess&) e; |
| if (FieldAccess::kAnonymousInterfaceBlock_OwnerKind == f.fOwnerKind) { |
| return kGlobals_Requirement; |
| } |
| return this->requirements(*((const FieldAccess&) e).fBase); |
| } |
| case Expression::kSwizzle_Kind: |
| return this->requirements(*((const Swizzle&) e).fBase); |
| case Expression::kBinary_Kind: { |
| const BinaryExpression& b = (const BinaryExpression&) e; |
| return this->requirements(*b.fLeft) | this->requirements(*b.fRight); |
| } |
| case Expression::kIndex_Kind: { |
| const IndexExpression& idx = (const IndexExpression&) e; |
| return this->requirements(*idx.fBase) | this->requirements(*idx.fIndex); |
| } |
| case Expression::kPrefix_Kind: |
| return this->requirements(*((const PrefixExpression&) e).fOperand); |
| case Expression::kPostfix_Kind: |
| return this->requirements(*((const PostfixExpression&) e).fOperand); |
| case Expression::kTernary_Kind: { |
| const TernaryExpression& t = (const TernaryExpression&) e; |
| return this->requirements(*t.fTest) | this->requirements(*t.fIfTrue) | |
| this->requirements(*t.fIfFalse); |
| } |
| case Expression::kVariableReference_Kind: { |
| const VariableReference& v = (const VariableReference&) e; |
| Requirements result = kNo_Requirements; |
| if (v.fVariable.fModifiers.fLayout.fBuiltin == SK_FRAGCOORD_BUILTIN) { |
| result = kInputs_Requirement; |
| } else if (Variable::kGlobal_Storage == v.fVariable.fStorage) { |
| if (v.fVariable.fModifiers.fFlags & Modifiers::kIn_Flag) { |
| result = kInputs_Requirement; |
| } else if (v.fVariable.fModifiers.fFlags & Modifiers::kOut_Flag) { |
| result = kOutputs_Requirement; |
| } else if (v.fVariable.fModifiers.fFlags & Modifiers::kUniform_Flag && |
| v.fVariable.fType.kind() != Type::kSampler_Kind) { |
| result = kUniforms_Requirement; |
| } else { |
| result = kGlobals_Requirement; |
| } |
| } |
| return result; |
| } |
| default: |
| return kNo_Requirements; |
| } |
| } |
| |
| MetalCodeGenerator::Requirements MetalCodeGenerator::requirements(const Statement& s) { |
| switch (s.fKind) { |
| case Statement::kBlock_Kind: { |
| Requirements result = kNo_Requirements; |
| for (const auto& child : ((const Block&) s).fStatements) { |
| result |= this->requirements(*child); |
| } |
| return result; |
| } |
| case Statement::kVarDeclaration_Kind: { |
| Requirements result = kNo_Requirements; |
| const VarDeclaration& var = (const VarDeclaration&) s; |
| if (var.fValue) { |
| result = this->requirements(*var.fValue); |
| } |
| return result; |
| } |
| case Statement::kVarDeclarations_Kind: { |
| Requirements result = kNo_Requirements; |
| const VarDeclarations& decls = *((const VarDeclarationsStatement&) s).fDeclaration; |
| for (const auto& stmt : decls.fVars) { |
| result |= this->requirements(*stmt); |
| } |
| return result; |
| } |
| case Statement::kExpression_Kind: |
| return this->requirements(*((const ExpressionStatement&) s).fExpression); |
| case Statement::kReturn_Kind: { |
| const ReturnStatement& r = (const ReturnStatement&) s; |
| if (r.fExpression) { |
| return this->requirements(*r.fExpression); |
| } |
| return kNo_Requirements; |
| } |
| case Statement::kIf_Kind: { |
| const IfStatement& i = (const IfStatement&) s; |
| return this->requirements(*i.fTest) | |
| this->requirements(*i.fIfTrue) | |
| (i.fIfFalse && this->requirements(*i.fIfFalse)); |
| } |
| case Statement::kFor_Kind: { |
| const ForStatement& f = (const ForStatement&) s; |
| return this->requirements(*f.fInitializer) | |
| this->requirements(*f.fTest) | |
| this->requirements(*f.fNext) | |
| this->requirements(*f.fStatement); |
| } |
| case Statement::kWhile_Kind: { |
| const WhileStatement& w = (const WhileStatement&) s; |
| return this->requirements(*w.fTest) | |
| this->requirements(*w.fStatement); |
| } |
| case Statement::kDo_Kind: { |
| const DoStatement& d = (const DoStatement&) s; |
| return this->requirements(*d.fTest) | |
| this->requirements(*d.fStatement); |
| } |
| case Statement::kSwitch_Kind: { |
| const SwitchStatement& sw = (const SwitchStatement&) s; |
| Requirements result = this->requirements(*sw.fValue); |
| for (const auto& c : sw.fCases) { |
| for (const auto& st : c->fStatements) { |
| result |= this->requirements(*st); |
| } |
| } |
| return result; |
| } |
| default: |
| return kNo_Requirements; |
| } |
| } |
| |
| MetalCodeGenerator::Requirements MetalCodeGenerator::requirements(const FunctionDeclaration& f) { |
| if (f.fBuiltin) { |
| return kNo_Requirements; |
| } |
| auto found = fRequirements.find(&f); |
| if (found == fRequirements.end()) { |
| for (const auto& e : fProgram) { |
| if (ProgramElement::kFunction_Kind == e.fKind) { |
| const FunctionDefinition& def = (const FunctionDefinition&) e; |
| if (&def.fDeclaration == &f) { |
| Requirements reqs = this->requirements(*def.fBody); |
| fRequirements[&f] = reqs; |
| return reqs; |
| } |
| } |
| } |
| } |
| return found->second; |
| } |
| |
| bool MetalCodeGenerator::generateCode() { |
| OutputStream* rawOut = fOut; |
| fOut = &fHeader; |
| #ifdef SK_MOLTENVK |
| fOut->write((const char*) &MVKMagicNum, sizeof(MVKMagicNum)); |
| #endif |
| fProgramKind = fProgram.fKind; |
| this->writeHeader(); |
| this->writeUniformStruct(); |
| this->writeInputStruct(); |
| this->writeOutputStruct(); |
| this->writeInterfaceBlocks(); |
| this->writeGlobalStruct(); |
| StringStream body; |
| fOut = &body; |
| for (const auto& e : fProgram) { |
| this->writeProgramElement(e); |
| } |
| fOut = rawOut; |
| |
| write_stringstream(fHeader, *rawOut); |
| write_stringstream(fExtraFunctions, *rawOut); |
| write_stringstream(body, *rawOut); |
| #ifdef SK_MOLTENVK |
| this->write("\0"); |
| #endif |
| return true; |
| } |
| |
| } |
