SkSL::RP::ScratchLValue Class Reference

Inheritance diagram for SkSL::RP::ScratchLValue:

Public Member Functions
	ScratchLValue (const Expression &e)
	~ScratchLValue () override
bool	isWritable () const override
SlotRange	fixedSlotRange (Generator *gen) override
AutoStack *	dynamicSlotRange () override
bool	push (Generator *gen, SlotRange fixedOffset, AutoStack *dynamicOffset, SkSpan< const int8_t > swizzle) override
bool	store (Generator *, SlotRange, AutoStack *, SkSpan< const int8_t >) override
Public Member Functions inherited from SkSL::RP::LValue
virtual	~LValue ()=default
virtual SkSpan< const int8_t >	swizzle ()

Additional Inherited Members
Public Attributes inherited from SkSL::RP::LValue
std::unique_ptr< Expression >	fScratchExpression

Detailed Description

Definition at line 714 of file SkSLRasterPipelineCodeGenerator.cpp.

Constructor & Destructor Documentation

ScratchLValue()

SkSL::RP::ScratchLValue::ScratchLValue ( const Expression &  e )

inlineexplicit

Definition at line 716 of file SkSLRasterPipelineCodeGenerator.cpp.

            : fExpression(&e)
            , fNumSlots(e.type().slotCount()) {}

~ScratchLValue()

SkSL::RP::ScratchLValue::~ScratchLValue ( )

inlineoverride

Definition at line 720 of file SkSLRasterPipelineCodeGenerator.cpp.

                              {
        if (fGenerator && fDedicatedStack.has_value()) {
            // Jettison the scratch expression.
            fDedicatedStack->enter();
            fGenerator->discardExpression(fNumSlots);
            fDedicatedStack->exit();
        }
    }

Member Function Documentation

dynamicSlotRange()

AutoStack * SkSL::RP::ScratchLValue::dynamicSlotRange ( )

inlineoverridevirtual

Returns a stack which holds a single integer, representing the dynamic offset of the lvalue. This value does not incorporate the fixed offset. If null is returned, the lvalue doesn't have a dynamic offset. evaluateDynamicIndices must be called before this is used.

Implements SkSL::RP::LValue.

Definition at line 737 of file SkSLRasterPipelineCodeGenerator.cpp.

                                           {
        return nullptr;
    }

fixedSlotRange()

SlotRange SkSL::RP::ScratchLValue::fixedSlotRange ( Generator *  gen )

inlineoverridevirtual

Returns the fixed slot range of the lvalue, after it is winnowed down to the selected field/index. The range is calculated assuming every dynamic index will evaluate to zero.

Implements SkSL::RP::LValue.

Definition at line 733 of file SkSLRasterPipelineCodeGenerator.cpp.

                                                      {
        return SlotRange{0, fNumSlots};
    }

isWritable()

bool SkSL::RP::ScratchLValue::isWritable ( ) const

inlineoverridevirtual

Returns true if this lvalue is actually writable–temporaries and uniforms are not.

Implements SkSL::RP::LValue.

Definition at line 729 of file SkSLRasterPipelineCodeGenerator.cpp.

                                     {
        return false;
    }

push()

bool SkSL::RP::ScratchLValue::push ( Generator *  gen, SlotRange  fixedOffset, AutoStack *  dynamicOffset, SkSpan< const int8_t >  swizzle  )

inlineoverridevirtual

Pushes values directly onto the stack.

Implements SkSL::RP::LValue.

Definition at line 741 of file SkSLRasterPipelineCodeGenerator.cpp.

                                                                   {
        if (!fDedicatedStack.has_value()) {
            // Push the scratch expression onto a dedicated stack.
            fGenerator = gen;
            fDedicatedStack.emplace(fGenerator);
            fDedicatedStack->enter();
            if (!fGenerator->pushExpression(*fExpression)) {
                return unsupported();
            }
            fDedicatedStack->exit();
        }
 
        if (dynamicOffset) {
            fDedicatedStack->pushCloneIndirect(fixedOffset, dynamicOffset->stackID(), fNumSlots);
        } else {
            fDedicatedStack->pushClone(fixedOffset, fNumSlots);
        }
        if (!swizzle.empty()) {
            gen->builder()->swizzle(fixedOffset.count, swizzle);
        }
        return true;
    }

store()

bool SkSL::RP::ScratchLValue::store ( Generator *  gen, SlotRange  fixedOffset, AutoStack *  dynamicOffset, SkSpan< const int8_t >  swizzle  )

inlineoverridevirtual

Stores topmost values from the stack directly into the lvalue.

Implements SkSL::RP::LValue.

Definition at line 767 of file SkSLRasterPipelineCodeGenerator.cpp.

                                                                                               {
        SkDEBUGFAIL("scratch lvalues cannot be stored into");
        return unsupported();
    }

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The documentation for this class was generated from the following file:

• third_party/skia/src/sksl/codegen/SkSLRasterPipelineCodeGenerator.cpp