| /* |
| * 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 "src/sksl/SkSLGLSLCodeGenerator.h" |
| |
| #include <memory> |
| |
| #include "src/sksl/SkSLCompiler.h" |
| #include "src/sksl/ir/SkSLExpressionStatement.h" |
| #include "src/sksl/ir/SkSLExtension.h" |
| #include "src/sksl/ir/SkSLIndexExpression.h" |
| #include "src/sksl/ir/SkSLModifiersDeclaration.h" |
| #include "src/sksl/ir/SkSLNop.h" |
| #include "src/sksl/ir/SkSLStructDefinition.h" |
| #include "src/sksl/ir/SkSLVariableReference.h" |
| |
| #ifndef SKSL_STANDALONE |
| #include "include/private/SkOnce.h" |
| #endif |
| |
| namespace SkSL { |
| |
| void GLSLCodeGenerator::write(const char* s) { |
| if (s[0] == 0) { |
| return; |
| } |
| if (fAtLineStart) { |
| for (int i = 0; i < fIndentation; i++) { |
| fOut->writeText(" "); |
| } |
| } |
| fOut->writeText(s); |
| fAtLineStart = false; |
| } |
| |
| void GLSLCodeGenerator::writeLine(const char* s) { |
| this->write(s); |
| fOut->writeText(fLineEnding); |
| fAtLineStart = true; |
| } |
| |
| void GLSLCodeGenerator::write(const String& s) { |
| this->write(s.c_str()); |
| } |
| |
| void GLSLCodeGenerator::write(StringFragment s) { |
| if (!s.fLength) { |
| return; |
| } |
| if (fAtLineStart) { |
| for (int i = 0; i < fIndentation; i++) { |
| fOut->writeText(" "); |
| } |
| } |
| fOut->write(s.fChars, s.fLength); |
| fAtLineStart = false; |
| } |
| |
| void GLSLCodeGenerator::writeLine(const String& s) { |
| this->writeLine(s.c_str()); |
| } |
| |
| void GLSLCodeGenerator::writeLine() { |
| this->writeLine(""); |
| } |
| |
| void GLSLCodeGenerator::writeExtension(const String& name) { |
| this->writeExtension(name, true); |
| } |
| |
| void GLSLCodeGenerator::writeExtension(const String& name, bool require) { |
| fExtensions.writeText("#extension "); |
| fExtensions.write(name.c_str(), name.length()); |
| fExtensions.writeText(require ? " : require\n" : " : enable\n"); |
| } |
| |
| bool GLSLCodeGenerator::usesPrecisionModifiers() const { |
| return this->caps().usesPrecisionModifiers(); |
| } |
| |
| // Returns the name of the type with array dimensions, e.g. `float[2]`. |
| String GLSLCodeGenerator::getTypeName(const Type& type) { |
| switch (type.typeKind()) { |
| case Type::TypeKind::kVector: { |
| const Type& component = type.componentType(); |
| String result; |
| if (component == *fContext.fTypes.fFloat || component == *fContext.fTypes.fHalf) { |
| result = "vec"; |
| } |
| else if (component.isSigned()) { |
| result = "ivec"; |
| } |
| else if (component.isUnsigned()) { |
| result = "uvec"; |
| } |
| else if (component == *fContext.fTypes.fBool) { |
| result = "bvec"; |
| } |
| else { |
| SK_ABORT("unsupported vector type"); |
| } |
| result += to_string(type.columns()); |
| return result; |
| } |
| case Type::TypeKind::kMatrix: { |
| String result; |
| const Type& component = type.componentType(); |
| if (component == *fContext.fTypes.fFloat || component == *fContext.fTypes.fHalf) { |
| result = "mat"; |
| } |
| else { |
| SK_ABORT("unsupported matrix type"); |
| } |
| result += to_string(type.columns()); |
| if (type.columns() != type.rows()) { |
| result += "x"; |
| result += to_string(type.rows()); |
| } |
| return result; |
| } |
| case Type::TypeKind::kArray: { |
| String baseTypeName = this->getTypeName(type.componentType()); |
| return (type.columns() == Type::kUnsizedArray) |
| ? String::printf("%s[]", baseTypeName.c_str()) |
| : String::printf("%s[%d]", baseTypeName.c_str(), type.columns()); |
| } |
| case Type::TypeKind::kScalar: { |
| if (type == *fContext.fTypes.fHalf) { |
| return "float"; |
| } |
| else if (type == *fContext.fTypes.fShort) { |
| return "int"; |
| } |
| else if (type == *fContext.fTypes.fUShort) { |
| return "uint"; |
| } |
| else if (type == *fContext.fTypes.fByte) { |
| return "int"; |
| } |
| else if (type == *fContext.fTypes.fUByte) { |
| return "uint"; |
| } |
| else { |
| return type.name(); |
| } |
| break; |
| } |
| case Type::TypeKind::kEnum: |
| return "int"; |
| default: |
| return type.name(); |
| } |
| } |
| |
| void GLSLCodeGenerator::writeStructDefinition(const StructDefinition& s) { |
| const Type& type = s.type(); |
| this->write("struct "); |
| this->write(type.name()); |
| this->writeLine(" {"); |
| fIndentation++; |
| for (const auto& f : type.fields()) { |
| this->writeModifiers(f.fModifiers, false); |
| this->writeTypePrecision(*f.fType); |
| const Type& baseType = f.fType->isArray() ? f.fType->componentType() : *f.fType; |
| this->writeType(baseType); |
| this->write(" "); |
| this->write(f.fName); |
| if (f.fType->isArray()) { |
| this->write("[" + to_string(f.fType->columns()) + "]"); |
| } |
| this->writeLine(";"); |
| } |
| fIndentation--; |
| this->writeLine("};"); |
| } |
| |
| void GLSLCodeGenerator::writeType(const Type& type) { |
| this->write(this->getTypeName(type)); |
| } |
| |
| void GLSLCodeGenerator::writeExpression(const Expression& expr, Precedence parentPrecedence) { |
| switch (expr.kind()) { |
| case Expression::Kind::kBinary: |
| this->writeBinaryExpression(expr.as<BinaryExpression>(), parentPrecedence); |
| break; |
| case Expression::Kind::kBoolLiteral: |
| this->writeBoolLiteral(expr.as<BoolLiteral>()); |
| break; |
| case Expression::Kind::kConstructor: |
| this->writeConstructor(expr.as<Constructor>(), parentPrecedence); |
| break; |
| case Expression::Kind::kIntLiteral: |
| this->writeIntLiteral(expr.as<IntLiteral>()); |
| break; |
| case Expression::Kind::kFieldAccess: |
| this->writeFieldAccess(expr.as<FieldAccess>()); |
| break; |
| case Expression::Kind::kFloatLiteral: |
| this->writeFloatLiteral(expr.as<FloatLiteral>()); |
| break; |
| case Expression::Kind::kFunctionCall: |
| this->writeFunctionCall(expr.as<FunctionCall>()); |
| break; |
| case Expression::Kind::kPrefix: |
| this->writePrefixExpression(expr.as<PrefixExpression>(), parentPrecedence); |
| break; |
| case Expression::Kind::kPostfix: |
| this->writePostfixExpression(expr.as<PostfixExpression>(), parentPrecedence); |
| break; |
| case Expression::Kind::kSetting: |
| this->writeSetting(expr.as<Setting>()); |
| break; |
| case Expression::Kind::kSwizzle: |
| this->writeSwizzle(expr.as<Swizzle>()); |
| break; |
| case Expression::Kind::kVariableReference: |
| this->writeVariableReference(expr.as<VariableReference>()); |
| break; |
| case Expression::Kind::kTernary: |
| this->writeTernaryExpression(expr.as<TernaryExpression>(), parentPrecedence); |
| break; |
| case Expression::Kind::kIndex: |
| this->writeIndexExpression(expr.as<IndexExpression>()); |
| break; |
| default: |
| SkDEBUGFAILF("unsupported expression: %s", expr.description().c_str()); |
| break; |
| } |
| } |
| |
| static bool is_abs(Expression& expr) { |
| if (expr.kind() != Expression::Kind::kFunctionCall) { |
| return false; |
| } |
| return expr.as<FunctionCall>().function().name() == "abs"; |
| } |
| |
| // turns min(abs(x), y) into ((tmpVar1 = abs(x)) < (tmpVar2 = y) ? tmpVar1 : tmpVar2) to avoid a |
| // Tegra3 compiler bug. |
| void GLSLCodeGenerator::writeMinAbsHack(Expression& absExpr, Expression& otherExpr) { |
| SkASSERT(!this->caps().canUseMinAndAbsTogether()); |
| String tmpVar1 = "minAbsHackVar" + to_string(fVarCount++); |
| String tmpVar2 = "minAbsHackVar" + to_string(fVarCount++); |
| this->fFunctionHeader += String(" ") + this->getTypePrecision(absExpr.type()) + |
| this->getTypeName(absExpr.type()) + " " + tmpVar1 + ";\n"; |
| this->fFunctionHeader += String(" ") + this->getTypePrecision(otherExpr.type()) + |
| this->getTypeName(otherExpr.type()) + " " + tmpVar2 + ";\n"; |
| this->write("((" + tmpVar1 + " = "); |
| this->writeExpression(absExpr, Precedence::kTopLevel); |
| this->write(") < (" + tmpVar2 + " = "); |
| this->writeExpression(otherExpr, Precedence::kAssignment); |
| this->write(") ? " + tmpVar1 + " : " + tmpVar2 + ")"); |
| } |
| |
| void GLSLCodeGenerator::writeInverseSqrtHack(const Expression& x) { |
| this->write("(1.0 / sqrt("); |
| this->writeExpression(x, Precedence::kTopLevel); |
| this->write("))"); |
| } |
| |
| void GLSLCodeGenerator::writeDeterminantHack(const Expression& mat) { |
| String name; |
| const Type& type = mat.type(); |
| if (type == *fContext.fTypes.fFloat2x2 || type == *fContext.fTypes.fHalf2x2) { |
| name = "_determinant2"; |
| if (fWrittenIntrinsics.find(name) == fWrittenIntrinsics.end()) { |
| fWrittenIntrinsics.insert(name); |
| fExtraFunctions.writeText(( |
| "float " + name + "(mat2 m) {" |
| " return m[0][0] * m[1][1] - m[0][1] * m[1][0];" |
| "}" |
| ).c_str()); |
| } |
| } |
| else if (type == *fContext.fTypes.fFloat3x3 || type == *fContext.fTypes.fHalf3x3) { |
| name = "_determinant3"; |
| if (fWrittenIntrinsics.find(name) == fWrittenIntrinsics.end()) { |
| fWrittenIntrinsics.insert(name); |
| fExtraFunctions.writeText(( |
| "float " + name + "(mat3 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;" |
| " return a00 * b01 + a01 * b11 + a02 * b21;" |
| "}" |
| ).c_str()); |
| } |
| } |
| else if (type == *fContext.fTypes.fFloat4x4 || type == *fContext.fTypes.fHalf4x4) { |
| name = "_determinant4"; |
| if (fWrittenIntrinsics.find(name) == fWrittenIntrinsics.end()) { |
| fWrittenIntrinsics.insert(name); |
| fExtraFunctions.writeText(( |
| "mat4 " + name + "(mat4 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;" |
| " return b00 * b11 - b01 * b10 + b02 * b09 + b03 * b08 - b04 * b07 + b05 * b06;" |
| "}" |
| ).c_str()); |
| } |
| } |
| else { |
| SkASSERT(false); |
| } |
| this->write(name + "("); |
| this->writeExpression(mat, Precedence::kTopLevel); |
| this->write(")"); |
| } |
| |
| void GLSLCodeGenerator::writeInverseHack(const Expression& mat) { |
| String name; |
| const Type& type = mat.type(); |
| if (type == *fContext.fTypes.fFloat2x2 || type == *fContext.fTypes.fHalf2x2) { |
| name = "_inverse2"; |
| if (fWrittenIntrinsics.find(name) == fWrittenIntrinsics.end()) { |
| fWrittenIntrinsics.insert(name); |
| fExtraFunctions.writeText(( |
| "mat2 " + name + "(mat2 m) {" |
| " return mat2(m[1][1], -m[0][1], -m[1][0], m[0][0]) / " |
| "(m[0][0] * m[1][1] - m[0][1] * m[1][0]);" |
| "}" |
| ).c_str()); |
| } |
| } |
| else if (type == *fContext.fTypes.fFloat3x3 || type == *fContext.fTypes.fHalf3x3) { |
| name = "_inverse3"; |
| if (fWrittenIntrinsics.find(name) == fWrittenIntrinsics.end()) { |
| fWrittenIntrinsics.insert(name); |
| fExtraFunctions.writeText(( |
| "mat3 " + name + "(mat3 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 mat3(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)) / det;" |
| "}" |
| ).c_str()); |
| } |
| } |
| else if (type == *fContext.fTypes.fFloat4x4 || type == *fContext.fTypes.fHalf4x4) { |
| name = "_inverse4"; |
| if (fWrittenIntrinsics.find(name) == fWrittenIntrinsics.end()) { |
| fWrittenIntrinsics.insert(name); |
| fExtraFunctions.writeText(( |
| "mat4 " + name + "(mat4 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 mat4(" |
| " 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()); |
| } |
| } |
| else { |
| SkASSERT(false); |
| } |
| this->write(name + "("); |
| this->writeExpression(mat, Precedence::kTopLevel); |
| this->write(")"); |
| } |
| |
| void GLSLCodeGenerator::writeTransposeHack(const Expression& mat) { |
| const Type& type = mat.type(); |
| String name = "transpose" + to_string(type.columns()) + to_string(type.rows()); |
| if (fWrittenIntrinsics.find(name) == fWrittenIntrinsics.end()) { |
| fWrittenIntrinsics.insert(name); |
| String typeName = this->getTypeName(type); |
| const Type& base = type.componentType(); |
| String transposed = this->getTypeName(base.toCompound(fContext, |
| type.rows(), |
| type.columns())); |
| fExtraFunctions.writeText((transposed + " " + name + "(" + typeName + " m) {\nreturn " + |
| transposed + "(").c_str()); |
| const char* separator = ""; |
| for (int row = 0; row < type.rows(); ++row) { |
| for (int column = 0; column < type.columns(); ++column) { |
| fExtraFunctions.writeText(separator); |
| fExtraFunctions.writeText(("m[" + to_string(column) + "][" + to_string(row) + |
| "]").c_str()); |
| separator = ", "; |
| } |
| } |
| fExtraFunctions.writeText("); }"); |
| } |
| this->write(name + "("); |
| this->writeExpression(mat, Precedence::kTopLevel); |
| this->write(")"); |
| } |
| |
| std::unordered_map<StringFragment, GLSLCodeGenerator::FunctionClass>* |
| GLSLCodeGenerator::fFunctionClasses = nullptr; |
| |
| void GLSLCodeGenerator::writeFunctionCall(const FunctionCall& c) { |
| const FunctionDeclaration& function = c.function(); |
| const ExpressionArray& arguments = c.arguments(); |
| #ifdef SKSL_STANDALONE |
| if (!fFunctionClasses) { |
| #else |
| static SkOnce once; |
| once([] { |
| #endif |
| fFunctionClasses = new std::unordered_map<StringFragment, FunctionClass>(); |
| (*fFunctionClasses)["abs"] = FunctionClass::kAbs; |
| (*fFunctionClasses)["atan"] = FunctionClass::kAtan; |
| (*fFunctionClasses)["determinant"] = FunctionClass::kDeterminant; |
| (*fFunctionClasses)["dFdx"] = FunctionClass::kDFdx; |
| (*fFunctionClasses)["dFdy"] = FunctionClass::kDFdy; |
| (*fFunctionClasses)["fwidth"] = FunctionClass::kFwidth; |
| (*fFunctionClasses)["fma"] = FunctionClass::kFMA; |
| (*fFunctionClasses)["fract"] = FunctionClass::kFract; |
| (*fFunctionClasses)["inverse"] = FunctionClass::kInverse; |
| (*fFunctionClasses)["inverseSqrt"] = FunctionClass::kInverseSqrt; |
| (*fFunctionClasses)["min"] = FunctionClass::kMin; |
| (*fFunctionClasses)["pow"] = FunctionClass::kPow; |
| (*fFunctionClasses)["saturate"] = FunctionClass::kSaturate; |
| (*fFunctionClasses)["sample"] = FunctionClass::kTexture; |
| (*fFunctionClasses)["transpose"] = FunctionClass::kTranspose; |
| } |
| #ifndef SKSL_STANDALONE |
| ); |
| #endif |
| const auto found = (function.isBuiltin() && !function.definition()) |
| ? fFunctionClasses->find(function.name()) |
| : fFunctionClasses->end(); |
| bool isTextureFunctionWithBias = false; |
| bool nameWritten = false; |
| if (found != fFunctionClasses->end()) { |
| switch (found->second) { |
| case FunctionClass::kAbs: { |
| if (!this->caps().emulateAbsIntFunction()) |
| break; |
| SkASSERT(arguments.size() == 1); |
| if (arguments[0]->type() != *fContext.fTypes.fInt) { |
| break; |
| } |
| // abs(int) on Intel OSX is incorrect, so emulate it: |
| String name = "_absemulation"; |
| this->write(name); |
| nameWritten = true; |
| if (fWrittenIntrinsics.find(name) == fWrittenIntrinsics.end()) { |
| fWrittenIntrinsics.insert(name); |
| fExtraFunctions.writeText(( |
| "int " + name + "(int x) {\n" |
| " return x * sign(x);\n" |
| "}\n" |
| ).c_str()); |
| } |
| break; |
| } |
| case FunctionClass::kAtan: |
| if (this->caps().mustForceNegatedAtanParamToFloat() && |
| arguments.size() == 2 && |
| arguments[1]->kind() == Expression::Kind::kPrefix) { |
| const PrefixExpression& p = (PrefixExpression&) *arguments[1]; |
| if (p.getOperator().kind() == Token::Kind::TK_MINUS) { |
| this->write("atan("); |
| this->writeExpression(*arguments[0], Precedence::kSequence); |
| this->write(", -1.0 * "); |
| this->writeExpression(*p.operand(), Precedence::kMultiplicative); |
| this->write(")"); |
| return; |
| } |
| } |
| break; |
| case FunctionClass::kDFdy: |
| if (fProgram.fConfig->fSettings.fFlipY) { |
| // Flipping Y also negates the Y derivatives. |
| this->write("-dFdy"); |
| nameWritten = true; |
| } |
| [[fallthrough]]; |
| case FunctionClass::kDFdx: |
| case FunctionClass::kFwidth: |
| if (!fFoundDerivatives && |
| this->caps().shaderDerivativeExtensionString()) { |
| this->writeExtension(this->caps().shaderDerivativeExtensionString()); |
| fFoundDerivatives = true; |
| } |
| break; |
| case FunctionClass::kDeterminant: |
| if (!this->caps().builtinDeterminantSupport()) { |
| SkASSERT(arguments.size() == 1); |
| this->writeDeterminantHack(*arguments[0]); |
| return; |
| } |
| break; |
| case FunctionClass::kFMA: |
| if (!this->caps().builtinFMASupport()) { |
| SkASSERT(arguments.size() == 3); |
| this->write("(("); |
| this->writeExpression(*arguments[0], Precedence::kSequence); |
| this->write(") * ("); |
| this->writeExpression(*arguments[1], Precedence::kSequence); |
| this->write(") + ("); |
| this->writeExpression(*arguments[2], Precedence::kSequence); |
| this->write("))"); |
| return; |
| } |
| break; |
| case FunctionClass::kFract: |
| if (!this->caps().canUseFractForNegativeValues()) { |
| SkASSERT(arguments.size() == 1); |
| this->write("(0.5 - sign("); |
| this->writeExpression(*arguments[0], Precedence::kSequence); |
| this->write(") * (0.5 - fract(abs("); |
| this->writeExpression(*arguments[0], Precedence::kSequence); |
| this->write("))))"); |
| return; |
| } |
| break; |
| case FunctionClass::kInverse: |
| if (this->caps().generation() < k140_GrGLSLGeneration) { |
| SkASSERT(arguments.size() == 1); |
| this->writeInverseHack(*arguments[0]); |
| return; |
| } |
| break; |
| case FunctionClass::kInverseSqrt: |
| if (this->caps().generation() < k130_GrGLSLGeneration) { |
| SkASSERT(arguments.size() == 1); |
| this->writeInverseSqrtHack(*arguments[0]); |
| return; |
| } |
| break; |
| case FunctionClass::kMin: |
| if (!this->caps().canUseMinAndAbsTogether()) { |
| SkASSERT(arguments.size() == 2); |
| if (is_abs(*arguments[0])) { |
| this->writeMinAbsHack(*arguments[0], *arguments[1]); |
| return; |
| } |
| if (is_abs(*arguments[1])) { |
| // note that this violates the GLSL left-to-right evaluation semantics. |
| // I doubt it will ever end up mattering, but it's worth calling out. |
| this->writeMinAbsHack(*arguments[1], *arguments[0]); |
| return; |
| } |
| } |
| break; |
| case FunctionClass::kPow: |
| if (!this->caps().removePowWithConstantExponent()) { |
| break; |
| } |
| // pow(x, y) on some NVIDIA drivers causes crashes if y is a |
| // constant. It's hard to tell what constitutes "constant" here |
| // so just replace in all cases. |
| |
| // Change pow(x, y) into exp2(y * log2(x)) |
| this->write("exp2("); |
| this->writeExpression(*arguments[1], Precedence::kMultiplicative); |
| this->write(" * log2("); |
| this->writeExpression(*arguments[0], Precedence::kSequence); |
| this->write("))"); |
| return; |
| case FunctionClass::kSaturate: |
| SkASSERT(arguments.size() == 1); |
| this->write("clamp("); |
| this->writeExpression(*arguments[0], Precedence::kSequence); |
| this->write(", 0.0, 1.0)"); |
| return; |
| case FunctionClass::kTexture: { |
| const char* dim = ""; |
| bool proj = false; |
| const Type& arg0Type = arguments[0]->type(); |
| const Type& arg1Type = arguments[1]->type(); |
| switch (arg0Type.dimensions()) { |
| case SpvDim1D: |
| dim = "1D"; |
| isTextureFunctionWithBias = true; |
| if (arg1Type == *fContext.fTypes.fFloat) { |
| proj = false; |
| } else { |
| SkASSERT(arg1Type == *fContext.fTypes.fFloat2); |
| proj = true; |
| } |
| break; |
| case SpvDim2D: |
| dim = "2D"; |
| if (arg0Type != *fContext.fTypes.fSamplerExternalOES) { |
| isTextureFunctionWithBias = true; |
| } |
| if (arg1Type == *fContext.fTypes.fFloat2) { |
| proj = false; |
| } else { |
| SkASSERT(arg1Type == *fContext.fTypes.fFloat3); |
| proj = true; |
| } |
| break; |
| case SpvDim3D: |
| dim = "3D"; |
| isTextureFunctionWithBias = true; |
| if (arg1Type == *fContext.fTypes.fFloat3) { |
| proj = false; |
| } else { |
| SkASSERT(arg1Type == *fContext.fTypes.fFloat4); |
| proj = true; |
| } |
| break; |
| case SpvDimCube: |
| dim = "Cube"; |
| isTextureFunctionWithBias = true; |
| proj = false; |
| break; |
| case SpvDimRect: |
| dim = "2DRect"; |
| proj = false; |
| break; |
| case SpvDimBuffer: |
| SkASSERT(false); // doesn't exist |
| dim = "Buffer"; |
| proj = false; |
| break; |
| case SpvDimSubpassData: |
| SkASSERT(false); // doesn't exist |
| dim = "SubpassData"; |
| proj = false; |
| break; |
| } |
| if (fTextureFunctionOverride != "") { |
| this->write(fTextureFunctionOverride.c_str()); |
| } else { |
| this->write("texture"); |
| if (this->caps().generation() < k130_GrGLSLGeneration) { |
| this->write(dim); |
| } |
| if (proj) { |
| this->write("Proj"); |
| } |
| } |
| nameWritten = true; |
| break; |
| } |
| case FunctionClass::kTranspose: |
| if (this->caps().generation() < k130_GrGLSLGeneration) { |
| SkASSERT(arguments.size() == 1); |
| this->writeTransposeHack(*arguments[0]); |
| return; |
| } |
| break; |
| } |
| } |
| if (!nameWritten) { |
| this->write(function.name()); |
| } |
| this->write("("); |
| const char* separator = ""; |
| for (const auto& arg : arguments) { |
| this->write(separator); |
| separator = ", "; |
| this->writeExpression(*arg, Precedence::kSequence); |
| } |
| if (fProgram.fConfig->fSettings.fSharpenTextures && isTextureFunctionWithBias) { |
| this->write(", -0.5"); |
| } |
| this->write(")"); |
| } |
| |
| void GLSLCodeGenerator::writeConstructor(const Constructor& c, Precedence parentPrecedence) { |
| if (c.arguments().size() == 1 && |
| (this->getTypeName(c.type()) == this->getTypeName(c.arguments()[0]->type()) || |
| (c.type().isScalar() && |
| c.arguments()[0]->type() == *fContext.fTypes.fFloatLiteral))) { |
| // in cases like half(float), they're different types as far as SkSL is concerned but the |
| // same type as far as GLSL is concerned. We avoid a redundant float(float) by just writing |
| // out the inner expression here. |
| this->writeExpression(*c.arguments()[0], parentPrecedence); |
| return; |
| } |
| this->writeType(c.type()); |
| this->write("("); |
| const char* separator = ""; |
| for (const auto& arg : c.arguments()) { |
| this->write(separator); |
| separator = ", "; |
| this->writeExpression(*arg, Precedence::kSequence); |
| } |
| this->write(")"); |
| } |
| |
| void GLSLCodeGenerator::writeFragCoord() { |
| if (!this->caps().canUseFragCoord()) { |
| if (!fSetupFragCoordWorkaround) { |
| const char* precision = usesPrecisionModifiers() ? "highp " : ""; |
| fFunctionHeader += precision; |
| fFunctionHeader += " float sk_FragCoord_InvW = 1. / sk_FragCoord_Workaround.w;\n"; |
| fFunctionHeader += precision; |
| fFunctionHeader += " vec4 sk_FragCoord_Resolved = " |
| "vec4(sk_FragCoord_Workaround.xyz * sk_FragCoord_InvW, sk_FragCoord_InvW);\n"; |
| // Ensure that we get exact .5 values for x and y. |
| fFunctionHeader += " sk_FragCoord_Resolved.xy = floor(sk_FragCoord_Resolved.xy) + " |
| "vec2(.5);\n"; |
| fSetupFragCoordWorkaround = true; |
| } |
| this->write("sk_FragCoord_Resolved"); |
| return; |
| } |
| |
| // We only declare "gl_FragCoord" when we're in the case where we want to use layout qualifiers |
| // to reverse y. Otherwise it isn't necessary and whether the "in" qualifier appears in the |
| // declaration varies in earlier GLSL specs. So it is simpler to omit it. |
| if (!fProgram.fConfig->fSettings.fFlipY) { |
| this->write("gl_FragCoord"); |
| } else if (const char* extension = this->caps().fragCoordConventionsExtensionString()) { |
| if (!fSetupFragPositionGlobal) { |
| if (this->caps().generation() < k150_GrGLSLGeneration) { |
| this->writeExtension(extension); |
| } |
| fGlobals.writeText("layout(origin_upper_left) in vec4 gl_FragCoord;\n"); |
| fSetupFragPositionGlobal = true; |
| } |
| this->write("gl_FragCoord"); |
| } else { |
| if (!fSetupFragPositionLocal) { |
| fFunctionHeader += usesPrecisionModifiers() ? "highp " : ""; |
| fFunctionHeader += " vec4 sk_FragCoord = vec4(gl_FragCoord.x, " SKSL_RTHEIGHT_NAME |
| " - gl_FragCoord.y, gl_FragCoord.z, gl_FragCoord.w);\n"; |
| fSetupFragPositionLocal = true; |
| } |
| this->write("sk_FragCoord"); |
| } |
| } |
| |
| void GLSLCodeGenerator::writeVariableReference(const VariableReference& ref) { |
| switch (ref.variable()->modifiers().fLayout.fBuiltin) { |
| case SK_FRAGCOLOR_BUILTIN: |
| if (this->caps().mustDeclareFragmentShaderOutput()) { |
| this->write("sk_FragColor"); |
| } else { |
| this->write("gl_FragColor"); |
| } |
| break; |
| case SK_FRAGCOORD_BUILTIN: |
| this->writeFragCoord(); |
| break; |
| case SK_WIDTH_BUILTIN: |
| this->write("u_skRTWidth"); |
| break; |
| case SK_HEIGHT_BUILTIN: |
| this->write("u_skRTHeight"); |
| break; |
| case SK_CLOCKWISE_BUILTIN: |
| this->write(fProgram.fConfig->fSettings.fFlipY ? "(!gl_FrontFacing)" : "gl_FrontFacing"); |
| break; |
| case SK_SAMPLEMASK_BUILTIN: |
| SkASSERT(this->caps().sampleMaskSupport()); |
| this->write("gl_SampleMask"); |
| break; |
| case SK_VERTEXID_BUILTIN: |
| this->write("gl_VertexID"); |
| break; |
| case SK_INSTANCEID_BUILTIN: |
| this->write("gl_InstanceID"); |
| break; |
| case SK_IN_BUILTIN: |
| this->write("gl_in"); |
| break; |
| case SK_INVOCATIONID_BUILTIN: |
| this->write("gl_InvocationID"); |
| break; |
| case SK_LASTFRAGCOLOR_BUILTIN: |
| this->write(this->caps().fbFetchColorName()); |
| break; |
| default: |
| this->write(ref.variable()->name()); |
| } |
| } |
| |
| void GLSLCodeGenerator::writeIndexExpression(const IndexExpression& expr) { |
| this->writeExpression(*expr.base(), Precedence::kPostfix); |
| this->write("["); |
| this->writeExpression(*expr.index(), Precedence::kTopLevel); |
| this->write("]"); |
| } |
| |
| bool is_sk_position(const FieldAccess& f) { |
| return "sk_Position" == f.base()->type().fields()[f.fieldIndex()].fName; |
| } |
| |
| void GLSLCodeGenerator::writeFieldAccess(const FieldAccess& f) { |
| if (f.ownerKind() == FieldAccess::OwnerKind::kDefault) { |
| this->writeExpression(*f.base(), Precedence::kPostfix); |
| this->write("."); |
| } |
| const Type& baseType = f.base()->type(); |
| StringFragment name = baseType.fields()[f.fieldIndex()].fName; |
| if (name == "sk_Position") { |
| this->write("gl_Position"); |
| } else if (name == "sk_PointSize") { |
| this->write("gl_PointSize"); |
| } else { |
| this->write(baseType.fields()[f.fieldIndex()].fName); |
| } |
| } |
| |
| void GLSLCodeGenerator::writeSwizzle(const Swizzle& swizzle) { |
| this->writeExpression(*swizzle.base(), Precedence::kPostfix); |
| this->write("."); |
| for (int c : swizzle.components()) { |
| SkASSERT(c >= 0 && c <= 3); |
| this->write(&("x\0y\0z\0w\0"[c * 2])); |
| } |
| } |
| |
| void GLSLCodeGenerator::writeBinaryExpression(const BinaryExpression& b, |
| Precedence parentPrecedence) { |
| const Expression& left = *b.left(); |
| const Expression& right = *b.right(); |
| Operator op = b.getOperator(); |
| if (this->caps().unfoldShortCircuitAsTernary() && |
| (op.kind() == Token::Kind::TK_LOGICALAND || op.kind() == Token::Kind::TK_LOGICALOR)) { |
| this->writeShortCircuitWorkaroundExpression(b, parentPrecedence); |
| return; |
| } |
| |
| Precedence precedence = op.getBinaryPrecedence(); |
| if (precedence >= parentPrecedence) { |
| this->write("("); |
| } |
| bool positionWorkaround = fProgram.fConfig->fKind == ProgramKind::kVertex && |
| op.isAssignment() && |
| left.is<FieldAccess>() && |
| is_sk_position(left.as<FieldAccess>()) && |
| !right.containsRTAdjust() && |
| !this->caps().canUseFragCoord(); |
| if (positionWorkaround) { |
| this->write("sk_FragCoord_Workaround = ("); |
| } |
| this->writeExpression(left, precedence); |
| this->write(" "); |
| this->write(op.operatorName()); |
| this->write(" "); |
| this->writeExpression(right, precedence); |
| if (positionWorkaround) { |
| this->write(")"); |
| } |
| if (precedence >= parentPrecedence) { |
| this->write(")"); |
| } |
| } |
| |
| void GLSLCodeGenerator::writeShortCircuitWorkaroundExpression(const BinaryExpression& b, |
| Precedence parentPrecedence) { |
| if (Precedence::kTernary >= parentPrecedence) { |
| this->write("("); |
| } |
| |
| // Transform: |
| // a && b => a ? b : false |
| // a || b => a ? true : b |
| this->writeExpression(*b.left(), Precedence::kTernary); |
| this->write(" ? "); |
| if (b.getOperator().kind() == Token::Kind::TK_LOGICALAND) { |
| this->writeExpression(*b.right(), Precedence::kTernary); |
| } else { |
| BoolLiteral boolTrue(fContext, -1, true); |
| this->writeBoolLiteral(boolTrue); |
| } |
| this->write(" : "); |
| if (b.getOperator().kind() == Token::Kind::TK_LOGICALAND) { |
| BoolLiteral boolFalse(fContext, -1, false); |
| this->writeBoolLiteral(boolFalse); |
| } else { |
| this->writeExpression(*b.right(), Precedence::kTernary); |
| } |
| if (Precedence::kTernary >= parentPrecedence) { |
| this->write(")"); |
| } |
| } |
| |
| void GLSLCodeGenerator::writeTernaryExpression(const TernaryExpression& t, |
| Precedence parentPrecedence) { |
| if (Precedence::kTernary >= parentPrecedence) { |
| this->write("("); |
| } |
| this->writeExpression(*t.test(), Precedence::kTernary); |
| this->write(" ? "); |
| this->writeExpression(*t.ifTrue(), Precedence::kTernary); |
| this->write(" : "); |
| this->writeExpression(*t.ifFalse(), Precedence::kTernary); |
| if (Precedence::kTernary >= parentPrecedence) { |
| this->write(")"); |
| } |
| } |
| |
| void GLSLCodeGenerator::writePrefixExpression(const PrefixExpression& p, |
| Precedence parentPrecedence) { |
| if (Precedence::kPrefix >= parentPrecedence) { |
| this->write("("); |
| } |
| this->write(p.getOperator().operatorName()); |
| this->writeExpression(*p.operand(), Precedence::kPrefix); |
| if (Precedence::kPrefix >= parentPrecedence) { |
| this->write(")"); |
| } |
| } |
| |
| void GLSLCodeGenerator::writePostfixExpression(const PostfixExpression& p, |
| Precedence parentPrecedence) { |
| if (Precedence::kPostfix >= parentPrecedence) { |
| this->write("("); |
| } |
| this->writeExpression(*p.operand(), Precedence::kPostfix); |
| this->write(p.getOperator().operatorName()); |
| if (Precedence::kPostfix >= parentPrecedence) { |
| this->write(")"); |
| } |
| } |
| |
| void GLSLCodeGenerator::writeBoolLiteral(const BoolLiteral& b) { |
| this->write(b.value() ? "true" : "false"); |
| } |
| |
| void GLSLCodeGenerator::writeIntLiteral(const IntLiteral& i) { |
| const Type& type = i.type(); |
| if (type == *fContext.fTypes.fUInt) { |
| this->write(to_string(i.value() & 0xffffffff) + "u"); |
| } else if (type == *fContext.fTypes.fUShort) { |
| this->write(to_string(i.value() & 0xffff) + "u"); |
| } else if (type == *fContext.fTypes.fUByte) { |
| this->write(to_string(i.value() & 0xff) + "u"); |
| } else { |
| this->write(to_string(i.value())); |
| } |
| } |
| |
| void GLSLCodeGenerator::writeFloatLiteral(const FloatLiteral& f) { |
| this->write(to_string(f.value())); |
| } |
| |
| void GLSLCodeGenerator::writeSetting(const Setting& s) { |
| SK_ABORT("internal error; setting was not folded to a constant during compilation\n"); |
| } |
| |
| void GLSLCodeGenerator::writeFunctionDeclaration(const FunctionDeclaration& f) { |
| this->writeTypePrecision(f.returnType()); |
| this->writeType(f.returnType()); |
| this->write(" " + f.name() + "("); |
| const char* separator = ""; |
| for (const auto& param : f.parameters()) { |
| this->write(separator); |
| separator = ", "; |
| this->writeModifiers(param->modifiers(), false); |
| std::vector<int> sizes; |
| const Type* type = ¶m->type(); |
| if (type->isArray()) { |
| sizes.push_back(type->columns()); |
| type = &type->componentType(); |
| } |
| this->writeTypePrecision(*type); |
| this->writeType(*type); |
| this->write(" " + param->name()); |
| for (int s : sizes) { |
| if (s == Type::kUnsizedArray) { |
| this->write("[]"); |
| } else { |
| this->write("[" + to_string(s) + "]"); |
| } |
| } |
| } |
| this->write(")"); |
| } |
| |
| void GLSLCodeGenerator::writeFunction(const FunctionDefinition& f) { |
| fSetupFragPositionLocal = false; |
| fSetupFragCoordWorkaround = false; |
| |
| this->writeFunctionDeclaration(f.declaration()); |
| this->writeLine(" {"); |
| fIndentation++; |
| |
| fFunctionHeader = ""; |
| OutputStream* oldOut = fOut; |
| StringStream buffer; |
| fOut = &buffer; |
| for (const std::unique_ptr<Statement>& stmt : f.body()->as<Block>().children()) { |
| if (!stmt->isEmpty()) { |
| this->writeStatement(*stmt); |
| this->writeLine(); |
| } |
| } |
| |
| fIndentation--; |
| this->writeLine("}"); |
| |
| fOut = oldOut; |
| this->write(fFunctionHeader); |
| this->write(buffer.str()); |
| } |
| |
| void GLSLCodeGenerator::writeFunctionPrototype(const FunctionPrototype& f) { |
| this->writeFunctionDeclaration(f.declaration()); |
| this->writeLine(";"); |
| } |
| |
| void GLSLCodeGenerator::writeModifiers(const Modifiers& modifiers, |
| bool globalContext) { |
| if (modifiers.fFlags & Modifiers::kFlat_Flag) { |
| this->write("flat "); |
| } |
| if (modifiers.fFlags & Modifiers::kNoPerspective_Flag) { |
| this->write("noperspective "); |
| } |
| String layout = modifiers.fLayout.description(); |
| if (layout.size()) { |
| this->write(layout + " "); |
| } |
| if ((modifiers.fFlags & Modifiers::kIn_Flag) && |
| (modifiers.fFlags & Modifiers::kOut_Flag)) { |
| this->write("inout "); |
| } else if (modifiers.fFlags & Modifiers::kIn_Flag) { |
| if (globalContext && |
| this->caps().generation() < GrGLSLGeneration::k130_GrGLSLGeneration) { |
| this->write(fProgram.fConfig->fKind == ProgramKind::kVertex ? "attribute " |
| : "varying "); |
| } else { |
| this->write("in "); |
| } |
| } else if (modifiers.fFlags & Modifiers::kOut_Flag) { |
| if (globalContext && |
| this->caps().generation() < GrGLSLGeneration::k130_GrGLSLGeneration) { |
| this->write("varying "); |
| } else { |
| this->write("out "); |
| } |
| } |
| if (modifiers.fFlags & Modifiers::kUniform_Flag) { |
| this->write("uniform "); |
| } |
| if (modifiers.fFlags & Modifiers::kConst_Flag) { |
| this->write("const "); |
| } |
| } |
| |
| void GLSLCodeGenerator::writeInterfaceBlock(const InterfaceBlock& intf) { |
| if (intf.typeName() == "sk_PerVertex") { |
| return; |
| } |
| this->writeModifiers(intf.variable().modifiers(), true); |
| this->writeLine(intf.typeName() + " {"); |
| fIndentation++; |
| const Type* structType = &intf.variable().type(); |
| if (structType->isArray()) { |
| structType = &structType->componentType(); |
| } |
| for (const auto& f : structType->fields()) { |
| this->writeModifiers(f.fModifiers, false); |
| this->writeTypePrecision(*f.fType); |
| this->writeType(*f.fType); |
| this->writeLine(" " + f.fName + ";"); |
| } |
| fIndentation--; |
| this->write("}"); |
| if (intf.instanceName().size()) { |
| this->write(" "); |
| this->write(intf.instanceName()); |
| if (intf.arraySize() > 0) { |
| this->write("["); |
| this->write(to_string(intf.arraySize())); |
| this->write("]"); |
| } else if (intf.arraySize() == Type::kUnsizedArray){ |
| this->write("[]"); |
| } |
| } |
| this->writeLine(";"); |
| } |
| |
| void GLSLCodeGenerator::writeVarInitializer(const Variable& var, const Expression& value) { |
| this->writeExpression(value, Precedence::kTopLevel); |
| } |
| |
| const char* GLSLCodeGenerator::getTypePrecision(const Type& type) { |
| if (usesPrecisionModifiers()) { |
| switch (type.typeKind()) { |
| case Type::TypeKind::kScalar: |
| if (type == *fContext.fTypes.fShort || type == *fContext.fTypes.fUShort || |
| type == *fContext.fTypes.fByte || type == *fContext.fTypes.fUByte) { |
| if (fProgram.fConfig->fSettings.fForceHighPrecision || |
| this->caps().incompleteShortIntPrecision()) { |
| return "highp "; |
| } |
| return "mediump "; |
| } |
| if (type == *fContext.fTypes.fHalf) { |
| return fProgram.fConfig->fSettings.fForceHighPrecision ? "highp " : "mediump "; |
| } |
| if (type == *fContext.fTypes.fFloat || type == *fContext.fTypes.fInt || |
| type == *fContext.fTypes.fUInt) { |
| return "highp "; |
| } |
| return ""; |
| case Type::TypeKind::kVector: // fall through |
| case Type::TypeKind::kMatrix: |
| case Type::TypeKind::kArray: |
| return this->getTypePrecision(type.componentType()); |
| default: |
| break; |
| } |
| } |
| return ""; |
| } |
| |
| void GLSLCodeGenerator::writeTypePrecision(const Type& type) { |
| this->write(this->getTypePrecision(type)); |
| } |
| |
| void GLSLCodeGenerator::writeVarDeclaration(const VarDeclaration& var, bool global) { |
| this->writeModifiers(var.var().modifiers(), global); |
| this->writeTypePrecision(var.baseType()); |
| this->writeType(var.baseType()); |
| this->write(" "); |
| this->write(var.var().name()); |
| if (var.arraySize() > 0) { |
| this->write("["); |
| this->write(to_string(var.arraySize())); |
| this->write("]"); |
| } else if (var.arraySize() == Type::kUnsizedArray){ |
| this->write("[]"); |
| } |
| if (var.value()) { |
| this->write(" = "); |
| this->writeVarInitializer(var.var(), *var.value()); |
| } |
| if (!fFoundExternalSamplerDecl && var.var().type() == *fContext.fTypes.fSamplerExternalOES) { |
| if (this->caps().externalTextureExtensionString()) { |
| this->writeExtension(this->caps().externalTextureExtensionString()); |
| } |
| if (this->caps().secondExternalTextureExtensionString()) { |
| this->writeExtension(this->caps().secondExternalTextureExtensionString()); |
| } |
| fFoundExternalSamplerDecl = true; |
| } |
| if (!fFoundRectSamplerDecl && var.var().type() == *fContext.fTypes.fSampler2DRect) { |
| fFoundRectSamplerDecl = true; |
| } |
| this->write(";"); |
| } |
| |
| void GLSLCodeGenerator::writeStatement(const Statement& s) { |
| switch (s.kind()) { |
| case Statement::Kind::kBlock: |
| this->writeBlock(s.as<Block>()); |
| break; |
| case Statement::Kind::kExpression: |
| this->writeExpression(*s.as<ExpressionStatement>().expression(), Precedence::kTopLevel); |
| this->write(";"); |
| break; |
| case Statement::Kind::kReturn: |
| this->writeReturnStatement(s.as<ReturnStatement>()); |
| break; |
| case Statement::Kind::kVarDeclaration: |
| this->writeVarDeclaration(s.as<VarDeclaration>(), false); |
| break; |
| case Statement::Kind::kIf: |
| this->writeIfStatement(s.as<IfStatement>()); |
| break; |
| case Statement::Kind::kFor: |
| this->writeForStatement(s.as<ForStatement>()); |
| break; |
| case Statement::Kind::kDo: |
| this->writeDoStatement(s.as<DoStatement>()); |
| break; |
| case Statement::Kind::kSwitch: |
| this->writeSwitchStatement(s.as<SwitchStatement>()); |
| break; |
| case Statement::Kind::kBreak: |
| this->write("break;"); |
| break; |
| case Statement::Kind::kContinue: |
| this->write("continue;"); |
| break; |
| case Statement::Kind::kDiscard: |
| this->write("discard;"); |
| break; |
| case Statement::Kind::kInlineMarker: |
| case Statement::Kind::kNop: |
| this->write(";"); |
| break; |
| default: |
| SkDEBUGFAILF("unsupported statement: %s", s.description().c_str()); |
| break; |
| } |
| } |
| |
| void GLSLCodeGenerator::writeBlock(const Block& b) { |
| // Write scope markers if this block is a scope, or if the block is empty (since we need to emit |
| // something here to make the code valid). |
| bool isScope = b.isScope() || b.isEmpty(); |
| if (isScope) { |
| this->writeLine("{"); |
| fIndentation++; |
| } |
| for (const std::unique_ptr<Statement>& stmt : b.children()) { |
| if (!stmt->isEmpty()) { |
| this->writeStatement(*stmt); |
| this->writeLine(); |
| } |
| } |
| if (isScope) { |
| fIndentation--; |
| this->write("}"); |
| } |
| } |
| |
| void GLSLCodeGenerator::writeIfStatement(const IfStatement& stmt) { |
| this->write("if ("); |
| this->writeExpression(*stmt.test(), Precedence::kTopLevel); |
| this->write(") "); |
| this->writeStatement(*stmt.ifTrue()); |
| if (stmt.ifFalse()) { |
| this->write(" else "); |
| this->writeStatement(*stmt.ifFalse()); |
| } |
| } |
| |
| void GLSLCodeGenerator::writeForStatement(const ForStatement& f) { |
| // Emit loops of the form 'for(;test;)' as 'while(test)', which is probably how they started |
| if (!f.initializer() && f.test() && !f.next()) { |
| this->write("while ("); |
| this->writeExpression(*f.test(), Precedence::kTopLevel); |
| this->write(") "); |
| this->writeStatement(*f.statement()); |
| return; |
| } |
| |
| this->write("for ("); |
| if (f.initializer() && !f.initializer()->isEmpty()) { |
| this->writeStatement(*f.initializer()); |
| } else { |
| this->write("; "); |
| } |
| if (f.test()) { |
| if (this->caps().addAndTrueToLoopCondition()) { |
| std::unique_ptr<Expression> and_true(new BinaryExpression( |
| /*offset=*/-1, f.test()->clone(), Token::Kind::TK_LOGICALAND, |
| std::make_unique<BoolLiteral>(fContext, -1, true), |
| fContext.fTypes.fBool.get())); |
| this->writeExpression(*and_true, Precedence::kTopLevel); |
| } else { |
| this->writeExpression(*f.test(), Precedence::kTopLevel); |
| } |
| } |
| this->write("; "); |
| if (f.next()) { |
| this->writeExpression(*f.next(), Precedence::kTopLevel); |
| } |
| this->write(") "); |
| this->writeStatement(*f.statement()); |
| } |
| |
| void GLSLCodeGenerator::writeDoStatement(const DoStatement& d) { |
| if (!this->caps().rewriteDoWhileLoops()) { |
| this->write("do "); |
| this->writeStatement(*d.statement()); |
| this->write(" while ("); |
| this->writeExpression(*d.test(), Precedence::kTopLevel); |
| this->write(");"); |
| return; |
| } |
| |
| // Otherwise, do the do while loop workaround, to rewrite loops of the form: |
| // do { |
| // CODE; |
| // } while (CONDITION) |
| // |
| // to loops of the form |
| // bool temp = false; |
| // while (true) { |
| // if (temp) { |
| // if (!CONDITION) { |
| // break; |
| // } |
| // } |
| // temp = true; |
| // CODE; |
| // } |
| String tmpVar = "_tmpLoopSeenOnce" + to_string(fVarCount++); |
| this->write("bool "); |
| this->write(tmpVar); |
| this->writeLine(" = false;"); |
| this->writeLine("while (true) {"); |
| fIndentation++; |
| this->write("if ("); |
| this->write(tmpVar); |
| this->writeLine(") {"); |
| fIndentation++; |
| this->write("if (!"); |
| this->writeExpression(*d.test(), Precedence::kPrefix); |
| this->writeLine(") {"); |
| fIndentation++; |
| this->writeLine("break;"); |
| fIndentation--; |
| this->writeLine("}"); |
| fIndentation--; |
| this->writeLine("}"); |
| this->write(tmpVar); |
| this->writeLine(" = true;"); |
| this->writeStatement(*d.statement()); |
| this->writeLine(); |
| fIndentation--; |
| this->write("}"); |
| } |
| |
| void GLSLCodeGenerator::writeSwitchStatement(const SwitchStatement& s) { |
| this->write("switch ("); |
| this->writeExpression(*s.value(), Precedence::kTopLevel); |
| this->writeLine(") {"); |
| fIndentation++; |
| for (const std::unique_ptr<SwitchCase>& c : s.cases()) { |
| if (c->value()) { |
| this->write("case "); |
| this->writeExpression(*c->value(), Precedence::kTopLevel); |
| this->writeLine(":"); |
| } else { |
| this->writeLine("default:"); |
| } |
| fIndentation++; |
| for (const auto& stmt : c->statements()) { |
| this->writeStatement(*stmt); |
| this->writeLine(); |
| } |
| fIndentation--; |
| } |
| fIndentation--; |
| this->write("}"); |
| } |
| |
| void GLSLCodeGenerator::writeReturnStatement(const ReturnStatement& r) { |
| this->write("return"); |
| if (r.expression()) { |
| this->write(" "); |
| this->writeExpression(*r.expression(), Precedence::kTopLevel); |
| } |
| this->write(";"); |
| } |
| |
| void GLSLCodeGenerator::writeHeader() { |
| if (this->caps().versionDeclString()) { |
| this->write(this->caps().versionDeclString()); |
| this->writeLine(); |
| } |
| } |
| |
| void GLSLCodeGenerator::writeProgramElement(const ProgramElement& e) { |
| switch (e.kind()) { |
| case ProgramElement::Kind::kExtension: |
| this->writeExtension(e.as<Extension>().name()); |
| break; |
| case ProgramElement::Kind::kGlobalVar: { |
| const VarDeclaration& decl = |
| e.as<GlobalVarDeclaration>().declaration()->as<VarDeclaration>(); |
| int builtin = decl.var().modifiers().fLayout.fBuiltin; |
| if (builtin == -1) { |
| // normal var |
| this->writeVarDeclaration(decl, true); |
| this->writeLine(); |
| } else if (builtin == SK_FRAGCOLOR_BUILTIN && |
| this->caps().mustDeclareFragmentShaderOutput()) { |
| if (fProgram.fConfig->fSettings.fFragColorIsInOut) { |
| this->write("inout "); |
| } else { |
| this->write("out "); |
| } |
| if (usesPrecisionModifiers()) { |
| this->write("mediump "); |
| } |
| this->writeLine("vec4 sk_FragColor;"); |
| } |
| break; |
| } |
| case ProgramElement::Kind::kInterfaceBlock: |
| this->writeInterfaceBlock(e.as<InterfaceBlock>()); |
| break; |
| case ProgramElement::Kind::kFunction: |
| this->writeFunction(e.as<FunctionDefinition>()); |
| break; |
| case ProgramElement::Kind::kFunctionPrototype: |
| this->writeFunctionPrototype(e.as<FunctionPrototype>()); |
| break; |
| case ProgramElement::Kind::kModifiers: { |
| const Modifiers& modifiers = e.as<ModifiersDeclaration>().modifiers(); |
| if (!fFoundGSInvocations && modifiers.fLayout.fInvocations >= 0) { |
| if (this->caps().gsInvocationsExtensionString()) { |
| this->writeExtension(this->caps().gsInvocationsExtensionString()); |
| } |
| fFoundGSInvocations = true; |
| } |
| this->writeModifiers(modifiers, true); |
| this->writeLine(";"); |
| break; |
| } |
| case ProgramElement::Kind::kEnum: |
| break; |
| case ProgramElement::Kind::kStructDefinition: |
| this->writeStructDefinition(e.as<StructDefinition>()); |
| break; |
| default: |
| SkDEBUGFAILF("unsupported program element %s\n", e.description().c_str()); |
| break; |
| } |
| } |
| |
| void GLSLCodeGenerator::writeInputVars() { |
| if (fProgram.fInputs.fRTWidth) { |
| const char* precision = usesPrecisionModifiers() ? "highp " : ""; |
| fGlobals.writeText("uniform "); |
| fGlobals.writeText(precision); |
| fGlobals.writeText("float " SKSL_RTWIDTH_NAME ";\n"); |
| } |
| if (fProgram.fInputs.fRTHeight) { |
| const char* precision = usesPrecisionModifiers() ? "highp " : ""; |
| fGlobals.writeText("uniform "); |
| fGlobals.writeText(precision); |
| fGlobals.writeText("float " SKSL_RTHEIGHT_NAME ";\n"); |
| } |
| } |
| |
| bool GLSLCodeGenerator::generateCode() { |
| this->writeHeader(); |
| if (fProgram.fConfig->fKind == ProgramKind::kGeometry && |
| this->caps().geometryShaderExtensionString()) { |
| this->writeExtension(this->caps().geometryShaderExtensionString()); |
| } |
| OutputStream* rawOut = fOut; |
| StringStream body; |
| fOut = &body; |
| // Write all the program elements except for functions. |
| for (const ProgramElement* e : fProgram.elements()) { |
| if (!e->is<FunctionDefinition>()) { |
| this->writeProgramElement(*e); |
| } |
| } |
| // Write the functions last. |
| // Why don't we write things in their original order? Because the Inliner likes to move function |
| // bodies around. After inlining, code can inadvertently move upwards, above ProgramElements |
| // that the code relies on. |
| for (const ProgramElement* e : fProgram.elements()) { |
| if (e->is<FunctionDefinition>()) { |
| this->writeProgramElement(*e); |
| } |
| } |
| fOut = rawOut; |
| |
| write_stringstream(fExtensions, *rawOut); |
| this->writeInputVars(); |
| write_stringstream(fGlobals, *rawOut); |
| |
| if (!this->caps().canUseFragCoord()) { |
| Layout layout; |
| switch (fProgram.fConfig->fKind) { |
| case ProgramKind::kVertex: { |
| Modifiers modifiers(layout, Modifiers::kOut_Flag); |
| this->writeModifiers(modifiers, true); |
| if (this->usesPrecisionModifiers()) { |
| this->write("highp "); |
| } |
| this->write("vec4 sk_FragCoord_Workaround;\n"); |
| break; |
| } |
| case ProgramKind::kFragment: { |
| Modifiers modifiers(layout, Modifiers::kIn_Flag); |
| this->writeModifiers(modifiers, true); |
| if (this->usesPrecisionModifiers()) { |
| this->write("highp "); |
| } |
| this->write("vec4 sk_FragCoord_Workaround;\n"); |
| break; |
| } |
| default: |
| break; |
| } |
| } |
| |
| if (this->usesPrecisionModifiers()) { |
| this->writeLine("precision mediump float;"); |
| this->writeLine("precision mediump sampler2D;"); |
| if (fFoundExternalSamplerDecl && |
| !this->caps().noDefaultPrecisionForExternalSamplers()) { |
| this->writeLine("precision mediump samplerExternalOES;"); |
| } |
| if (fFoundRectSamplerDecl) { |
| this->writeLine("precision mediump sampler2DRect;"); |
| } |
| } |
| write_stringstream(fExtraFunctions, *rawOut); |
| write_stringstream(body, *rawOut); |
| return 0 == fErrors.errorCount(); |
| } |
| |
| } // namespace SkSL |
