src/sksl/SkSLProgramSettings.h - skia - Git at Google

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #ifndef SKSL_PROGRAMSETTINGS
 #define SKSL_PROGRAMSETTINGS

 #include "include/private/SkSLDefines.h"
 #include "include/private/SkSLProgramKind.h"
 #include "include/sksl/SkSLVersion.h"

 #include <vector>

 namespace SkSL {

 class ExternalFunction;

 /**
  * Holds the compiler settings for a program.
  */
 struct ProgramSettings {
     // If true the destination fragment color is read sk_FragColor. It must be declared inout.
     bool fFragColorIsInOut = false;
     // if true, all halfs are forced to be floats
     bool fForceHighPrecision = false;
     // if true, add -0.5 bias to LOD of all texture lookups
     bool fSharpenTextures = false;
     // If true, sk_FragCoord, the dFdy gradient, and sk_Clockwise won't be modified by the
     // rtFlip. Additionally, the 'fUseFlipRTUniform' boolean will be forced to false so no rtFlip
     // uniform will be emitted.
     bool fForceNoRTFlip = false;
     // if the program needs to create an RTFlip uniform, this is its offset in the uniform buffer
     int fRTFlipOffset = -1;
     // if the program needs to create an RTFlip uniform and is creating SPIR-V, this is the binding
     // and set number of the uniform buffer.
     int fRTFlipBinding = -1;
     int fRTFlipSet = -1;
     // If layout(set=S, binding=B) is not specified for a uniform, these values will be used.
     // At present, zero is always used by our backends.
     int fDefaultUniformSet = 0;
     int fDefaultUniformBinding = 0;
     // Enables the SkSL optimizer. Note that we never disable optimizations which are needed to
     // fully evaluate constant-expressions, like constant folding or constant-intrinsic evaluation.
     bool fOptimize = true;
     // (Requires fOptimize = true) Removes any uncalled functions other than main(). Note that a
     // function which starts out being used may end up being uncalled after optimization.
     bool fRemoveDeadFunctions = true;
     // (Requires fOptimize = true) Removes variables which are never used.
     bool fRemoveDeadVariables = true;
     // (Requires fOptimize = true) When greater than zero, enables the inliner. The threshold value
     // sets an upper limit on the acceptable amount of code growth from inlining.
     int fInlineThreshold = SkSL::kDefaultInlineThreshold;
     // If true, every function in the generated program will be given the `noinline` modifier.
     bool fForceNoInline = false;
     // If true, implicit conversions to lower precision numeric types are allowed (e.g., float to
     // half). These are always allowed when compiling Runtime Effects.
     bool fAllowNarrowingConversions = false;
     // If true, then Debug code will run SPIR-V output through the validator to ensure its
     // correctness
     bool fValidateSPIRV = true;
     // If true, any synthetic uniforms must use push constant syntax
     bool fUsePushConstants = false;
     // TODO(skia:11209) - Replace this with a "promised" capabilities?
     // Sets a maximum SkSL version. Compilation will fail if the program uses features that aren't
     // allowed at the requested version. For instance, a valid program must have fully-unrollable
     // `for` loops at version 100, but any loop structure is allowed at version 300.
     SkSL::Version fMaxVersionAllowed = SkSL::Version::k100;
     // If true, SkVM debug traces will contain the `trace_var` opcode. This opcode can cause the
     // generated code to contain a lot of extra computations, because we need to explicitly compute
     // every temporary value, even ones that would otherwise be optimized away entirely. The other
     // debug opcodes are much less invasive on the generated code.
     bool fAllowTraceVarInSkVMDebugTrace = true;
     // If true, SkSL will use a memory pool for all IR nodes when compiling a program. This is
     // usually a significant speed increase, but uses more memory, so it is a good idea for programs
     // that will be freed shortly after compilation. It can also be useful to disable this flag when
     // investigating memory corruption. (This controls behavior of the SkSL compiler, not the code
     // we generate.)
     bool fUseMemoryPool = true;
     // If true, VarDeclaration can be cloned for testing purposes. See VarDeclaration::clone for
     // more information.
     bool fAllowVarDeclarationCloneForTesting = false;
     // External functions available for use in runtime effects. These values are registered in the
     // symbol table of the Program, but ownership is *not* transferred. It is up to the caller to
     // keep them alive.
     const std::vector<std::unique_ptr<ExternalFunction>>* fExternalFunctions = nullptr;
 };

 /**
  * All the configuration data for a given program.
  */
 struct ProgramConfig {
     /** True if we are currently processing one of the built-in SkSL include modules. */
     bool fIsBuiltinCode;
     ProgramKind fKind;
     ProgramSettings fSettings;

     // When enforcesSkSLVersion() is true, this determines the available feature set that will be
     // enforced. This is set automatically when the `#version` directive is parsed.
     SkSL::Version fRequiredSkSLVersion = SkSL::Version::k100;

     bool enforcesSkSLVersion() const {
         return IsRuntimeEffect(fKind) || fKind == ProgramKind::kGeneric;
     }

     bool strictES2Mode() const {
         // TODO(skia:11209): Remove the first condition - so this is just based on #version.
         //                   Make it more generic (eg, isVersionLT) checking.
         return fSettings.fMaxVersionAllowed == Version::k100 &&
                fRequiredSkSLVersion == Version::k100 &&
                this->enforcesSkSLVersion();
     }

     const char* versionDescription() const {
         if (this->enforcesSkSLVersion()) {
             switch (fRequiredSkSLVersion) {
                 case Version::k100: return "#version 100\n";
                 case Version::k300: return "#version 300\n";
             }
         }
         return "";
     }

     static bool IsFragment(ProgramKind kind) {
         return kind == ProgramKind::kFragment ||
                kind == ProgramKind::kGraphiteFragment;
     }

     static bool IsVertex(ProgramKind kind) {
         return kind == ProgramKind::kVertex ||
                kind == ProgramKind::kGraphiteVertex;
     }

     static bool IsCompute(ProgramKind kind) {
         return kind == ProgramKind::kCompute;
     }

     static bool IsRuntimeEffect(ProgramKind kind) {
         return (kind == ProgramKind::kRuntimeColorFilter ||
                 kind == ProgramKind::kRuntimeShader ||
                 kind == ProgramKind::kRuntimeBlender ||
                 kind == ProgramKind::kPrivateRuntimeShader ||
                 kind == ProgramKind::kMeshVertex ||
                 kind == ProgramKind::kMeshFragment);
     }
 };

 }  // namespace SkSL

 #endif
	/*
	* Copyright 2016 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#ifndef SKSL_PROGRAMSETTINGS
	#define SKSL_PROGRAMSETTINGS

	#include "include/private/SkSLDefines.h"
	#include "include/private/SkSLProgramKind.h"
	#include "include/sksl/SkSLVersion.h"

	#include <vector>

	namespace SkSL {

	class ExternalFunction;

	/**
	* Holds the compiler settings for a program.
	*/
	struct ProgramSettings {
	// If true the destination fragment color is read sk_FragColor. It must be declared inout.
	bool fFragColorIsInOut = false;
	// if true, all halfs are forced to be floats
	bool fForceHighPrecision = false;
	// if true, add -0.5 bias to LOD of all texture lookups
	bool fSharpenTextures = false;
	// If true, sk_FragCoord, the dFdy gradient, and sk_Clockwise won't be modified by the
	// rtFlip. Additionally, the 'fUseFlipRTUniform' boolean will be forced to false so no rtFlip
	// uniform will be emitted.
	bool fForceNoRTFlip = false;
	// if the program needs to create an RTFlip uniform, this is its offset in the uniform buffer
	int fRTFlipOffset = -1;
	// if the program needs to create an RTFlip uniform and is creating SPIR-V, this is the binding
	// and set number of the uniform buffer.
	int fRTFlipBinding = -1;
	int fRTFlipSet = -1;
	// If layout(set=S, binding=B) is not specified for a uniform, these values will be used.
	// At present, zero is always used by our backends.
	int fDefaultUniformSet = 0;
	int fDefaultUniformBinding = 0;
	// Enables the SkSL optimizer. Note that we never disable optimizations which are needed to
	// fully evaluate constant-expressions, like constant folding or constant-intrinsic evaluation.
	bool fOptimize = true;
	// (Requires fOptimize = true) Removes any uncalled functions other than main(). Note that a
	// function which starts out being used may end up being uncalled after optimization.
	bool fRemoveDeadFunctions = true;
	// (Requires fOptimize = true) Removes variables which are never used.
	bool fRemoveDeadVariables = true;
	// (Requires fOptimize = true) When greater than zero, enables the inliner. The threshold value
	// sets an upper limit on the acceptable amount of code growth from inlining.
	int fInlineThreshold = SkSL::kDefaultInlineThreshold;
	// If true, every function in the generated program will be given the `noinline` modifier.
	bool fForceNoInline = false;
	// If true, implicit conversions to lower precision numeric types are allowed (e.g., float to
	// half). These are always allowed when compiling Runtime Effects.
	bool fAllowNarrowingConversions = false;
	// If true, then Debug code will run SPIR-V output through the validator to ensure its
	// correctness
	bool fValidateSPIRV = true;
	// If true, any synthetic uniforms must use push constant syntax
	bool fUsePushConstants = false;
	// TODO(skia:11209) - Replace this with a "promised" capabilities?
	// Sets a maximum SkSL version. Compilation will fail if the program uses features that aren't
	// allowed at the requested version. For instance, a valid program must have fully-unrollable
	// `for` loops at version 100, but any loop structure is allowed at version 300.
	SkSL::Version fMaxVersionAllowed = SkSL::Version::k100;
	// If true, SkVM debug traces will contain the `trace_var` opcode. This opcode can cause the
	// generated code to contain a lot of extra computations, because we need to explicitly compute
	// every temporary value, even ones that would otherwise be optimized away entirely. The other
	// debug opcodes are much less invasive on the generated code.
	bool fAllowTraceVarInSkVMDebugTrace = true;
	// If true, SkSL will use a memory pool for all IR nodes when compiling a program. This is
	// usually a significant speed increase, but uses more memory, so it is a good idea for programs
	// that will be freed shortly after compilation. It can also be useful to disable this flag when
	// investigating memory corruption. (This controls behavior of the SkSL compiler, not the code
	// we generate.)
	bool fUseMemoryPool = true;
	// If true, VarDeclaration can be cloned for testing purposes. See VarDeclaration::clone for
	// more information.
	bool fAllowVarDeclarationCloneForTesting = false;
	// External functions available for use in runtime effects. These values are registered in the
	// symbol table of the Program, but ownership is not transferred. It is up to the caller to
	// keep them alive.
	const std::vector<std::unique_ptr<ExternalFunction>>* fExternalFunctions = nullptr;
	};

	/**
	* All the configuration data for a given program.
	*/
	struct ProgramConfig {
	/** True if we are currently processing one of the built-in SkSL include modules. */
	bool fIsBuiltinCode;
	ProgramKind fKind;
	ProgramSettings fSettings;

	// When enforcesSkSLVersion() is true, this determines the available feature set that will be
	// enforced. This is set automatically when the `#version` directive is parsed.
	SkSL::Version fRequiredSkSLVersion = SkSL::Version::k100;

	bool enforcesSkSLVersion() const {
	return IsRuntimeEffect(fKind) \|\| fKind == ProgramKind::kGeneric;
	}

	bool strictES2Mode() const {
	// TODO(skia:11209): Remove the first condition - so this is just based on #version.
	// Make it more generic (eg, isVersionLT) checking.
	return fSettings.fMaxVersionAllowed == Version::k100 &&
	fRequiredSkSLVersion == Version::k100 &&
	this->enforcesSkSLVersion();
	}

	const char* versionDescription() const {
	if (this->enforcesSkSLVersion()) {
	switch (fRequiredSkSLVersion) {
	case Version::k100: return "#version 100\n";
	case Version::k300: return "#version 300\n";
	}
	}
	return "";
	}

	static bool IsFragment(ProgramKind kind) {
	return kind == ProgramKind::kFragment \|\|
	kind == ProgramKind::kGraphiteFragment;
	}

	static bool IsVertex(ProgramKind kind) {
	return kind == ProgramKind::kVertex \|\|
	kind == ProgramKind::kGraphiteVertex;
	}

	static bool IsCompute(ProgramKind kind) {
	return kind == ProgramKind::kCompute;
	}

	static bool IsRuntimeEffect(ProgramKind kind) {
	return (kind == ProgramKind::kRuntimeColorFilter \|\|
	kind == ProgramKind::kRuntimeShader \|\|
	kind == ProgramKind::kRuntimeBlender \|\|
	kind == ProgramKind::kPrivateRuntimeShader \|\|
	kind == ProgramKind::kMeshVertex \|\|
	kind == ProgramKind::kMeshFragment);
	}
	};

	} // namespace SkSL

	#endif