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Allow SampleChild to pass input colors.

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This feature is used by the OverrideInputFragmentProcessor.

Change-Id: Icdb69fb43ca7b64042b5286eed803206633b1680
Bug: skia:11909
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/402557
Reviewed-by: Brian Osman <brianosman@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
This commit is contained in:
John Stiles 2021-04-29 09:34:35 -04:00 committed by Skia Commit-Bot
parent 4cd134cc03
commit 695cc3a83b
1 changed files with 27 additions and 7 deletions
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34
src/sksl/dsl/priv/DSLFPs.cpp
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@ -29,13 +29,33 @@ DSLVar sk_SampleCoord() {
return DSLVar("sk_SampleCoord"); return DSLVar("sk_SampleCoord");
} }
DSLExpression SampleChild(int index, DSLExpression coords) { DSLExpression SampleChild(int index, DSLExpression sampleExpr) {
std::unique_ptr<SkSL::Expression> coordsExpr = coords.release(); std::unique_ptr<SkSL::Expression> expr = sampleExpr.release();
SkString code = DSLWriter::CurrentProcessor()->invokeChild(index, *DSLWriter::CurrentEmitArgs(), if (expr) {
coordsExpr ? coordsExpr->description() SkASSERT(expr->type().isVector());
: ""); SkASSERT(expr->type().componentType().isFloat());
return DSLExpression(std::make_unique<SkSL::CodeStringExpression>(code.c_str(), }
DSLWriter::Context().fTypes.fHalf4.get()));
GrGLSLFragmentProcessor* proc = DSLWriter::CurrentProcessor();
GrGLSLFragmentProcessor::EmitArgs& emitArgs = *DSLWriter::CurrentEmitArgs();
SkString code;
switch (expr ? expr->type().columns() : 0) {
default:
SkASSERTF(0, "unsupported SampleChild type: %s", expr->type().description().c_str());
[[fallthrough]];
case 0:
code = proc->invokeChild(index, emitArgs);
break;
case 2:
code = proc->invokeChild(index, emitArgs, /*skslCoords=*/expr->description());
break;
case 4:
code = proc->invokeChild(index, /*inputColor=*/expr->description().c_str(), emitArgs);
break;
}
return DSLExpression(std::make_unique<SkSL::CodeStringExpression>(
code.c_str(), DSLWriter::Context().fTypes.fHalf4.get()));
} }
GrGLSLUniformHandler::UniformHandle VarUniformHandle(const DSLVar& var) { GrGLSLUniformHandler::UniformHandle VarUniformHandle(const DSLVar& var) {