ComposeShader GPU implementations

Bug: skia:
Change-Id: I007b46ead1900a8f5cce82dec33b6d662fc63d8e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/206918
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
diff --git a/src/gpu/effects/GrComposeLerpRedEffect.cpp b/src/gpu/effects/GrComposeLerpRedEffect.cpp
new file mode 100644
index 0000000..fceeff1
--- /dev/null
+++ b/src/gpu/effects/GrComposeLerpRedEffect.cpp
@@ -0,0 +1,75 @@
+/*
+ * Copyright 2019 Google LLC.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/**************************************************************************************************
+ *** This file was autogenerated from GrComposeLerpRedEffect.fp; do not modify.
+ **************************************************************************************************/
+#include "GrComposeLerpRedEffect.h"
+#include "glsl/GrGLSLFragmentProcessor.h"
+#include "glsl/GrGLSLFragmentShaderBuilder.h"
+#include "glsl/GrGLSLProgramBuilder.h"
+#include "GrTexture.h"
+#include "SkSLCPP.h"
+#include "SkSLUtil.h"
+class GrGLSLComposeLerpRedEffect : public GrGLSLFragmentProcessor {
+public:
+    GrGLSLComposeLerpRedEffect() {}
+    void emitCode(EmitArgs& args) override {
+        GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
+        const GrComposeLerpRedEffect& _outer = args.fFp.cast<GrComposeLerpRedEffect>();
+        (void)_outer;
+        SkString _child0("_child0");
+        if (_outer.child1_index >= 0) {
+            this->emitChild(_outer.child1_index, &_child0, args);
+        } else {
+            fragBuilder->codeAppendf("half4 %s;", _child0.c_str());
+        }
+        SkString _child1("_child1");
+        if (_outer.child2_index >= 0) {
+            this->emitChild(_outer.child2_index, &_child1, args);
+        } else {
+            fragBuilder->codeAppendf("half4 %s;", _child1.c_str());
+        }
+        SkString _child2("_child2");
+        this->emitChild(_outer.lerp_index, &_child2, args);
+        fragBuilder->codeAppendf(
+                "%s = mix(%s ? %s : %s, %s ? %s : %s, %s.x);\n%s = half4(1.0, 0.0, 1.0, 1.0);\n",
+                args.fOutputColor, _outer.child1_index >= 0 ? "true" : "false", _child0.c_str(),
+                args.fInputColor, _outer.child2_index >= 0 ? "true" : "false", _child1.c_str(),
+                args.fInputColor, _child2.c_str(), args.fOutputColor);
+    }
+
+private:
+    void onSetData(const GrGLSLProgramDataManager& pdman,
+                   const GrFragmentProcessor& _proc) override {}
+};
+GrGLSLFragmentProcessor* GrComposeLerpRedEffect::onCreateGLSLInstance() const {
+    return new GrGLSLComposeLerpRedEffect();
+}
+void GrComposeLerpRedEffect::onGetGLSLProcessorKey(const GrShaderCaps& caps,
+                                                   GrProcessorKeyBuilder* b) const {}
+bool GrComposeLerpRedEffect::onIsEqual(const GrFragmentProcessor& other) const {
+    const GrComposeLerpRedEffect& that = other.cast<GrComposeLerpRedEffect>();
+    (void)that;
+    return true;
+}
+GrComposeLerpRedEffect::GrComposeLerpRedEffect(const GrComposeLerpRedEffect& src)
+        : INHERITED(kGrComposeLerpRedEffect_ClassID, src.optimizationFlags())
+        , child1_index(src.child1_index)
+        , child2_index(src.child2_index)
+        , lerp_index(src.lerp_index) {
+    if (child1_index >= 0) {
+        this->registerChildProcessor(src.childProcessor(child1_index).clone());
+    }
+    if (child2_index >= 0) {
+        this->registerChildProcessor(src.childProcessor(child2_index).clone());
+    }
+    this->registerChildProcessor(src.childProcessor(lerp_index).clone());
+}
+std::unique_ptr<GrFragmentProcessor> GrComposeLerpRedEffect::clone() const {
+    return std::unique_ptr<GrFragmentProcessor>(new GrComposeLerpRedEffect(*this));
+}