2aa85df8e7
Also simplify type registration. Change-Id: Ia47febb2ae2cd5821476c3dd33a688b688aa6d6d Reviewed-on: https://skia-review.googlesource.com/c/skia/+/238359 Commit-Queue: Brian Osman <brianosman@google.com> Reviewed-by: Brian Osman <brianosman@google.com>
76 lines
2.5 KiB
C++
76 lines
2.5 KiB
C++
/*
|
|
* Copyright 2019 Google LLC
|
|
*
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*/
|
|
|
|
#ifndef SkParticleBinding_DEFINED
|
|
#define SkParticleBinding_DEFINED
|
|
|
|
#include "include/core/SkString.h"
|
|
#include "modules/particles/include/SkReflected.h"
|
|
#include "src/sksl/SkSLExternalValue.h"
|
|
|
|
#include <memory>
|
|
|
|
struct SkCurve;
|
|
struct SkColorCurve;
|
|
class SkRandom;
|
|
|
|
namespace SkSL {
|
|
class Compiler;
|
|
}
|
|
|
|
class SkParticleExternalValue : public SkSL::ExternalValue {
|
|
public:
|
|
SkParticleExternalValue(const char* name, SkSL::Compiler& compiler, const SkSL::Type& type)
|
|
: SkSL::ExternalValue(name, type)
|
|
, fCompiler(compiler)
|
|
, fRandom(nullptr) {
|
|
}
|
|
|
|
void setRandom(SkRandom* random) { fRandom = random; }
|
|
|
|
protected:
|
|
SkSL::Compiler& fCompiler;
|
|
SkRandom* fRandom;
|
|
};
|
|
|
|
class SkParticleBinding : public SkReflected {
|
|
public:
|
|
SkParticleBinding(const char* name = "name") : fName(name) {}
|
|
|
|
REFLECTED_ABSTRACT(SkParticleBinding, SkReflected)
|
|
|
|
void visitFields(SkFieldVisitor* v) override;
|
|
virtual std::unique_ptr<SkParticleExternalValue> toValue(SkSL::Compiler&) = 0;
|
|
|
|
static void RegisterBindingTypes();
|
|
|
|
/*
|
|
* All SkParticleBinding objects expose a particular native object to an effect's SkSL code.
|
|
* In all cases, the 'name' is the symbol that will be used to access the object from the SkSL.
|
|
* Each binding is a callable object, so the SkSL name behaves like a function. The behavior of
|
|
* each kind of binding is described below.
|
|
*/
|
|
|
|
// Binds an SkCurve to an effect's SkSL. The curve is a one-dimensional function, described
|
|
// in SkCurve.h. It is called in the SkSL as 'name(t)', and returns a single float value.
|
|
static sk_sp<SkParticleBinding> MakeCurve(const char* name, const SkCurve& curve);
|
|
|
|
// Binds an SkColorCurve to an effect's SkSL. The curve is a one-dimensional, function,
|
|
// described in SkCurve.h. It is called in the SkSL as 'name(t)', and returns a float4 value.
|
|
static sk_sp<SkParticleBinding> MakeColorCurve(const char* name, const SkColorCurve& curve);
|
|
|
|
// Binds an SkPath to an effect's SkSL. The path is specified using SVG syntax. It is called
|
|
// in the SkSL as 'name(t)'. 't' is a normalized distance along the path. This returns a float4
|
|
// value, containing the position in .xy, and the normal in .zw.
|
|
static sk_sp<SkParticleBinding> MakePathBinding(const char* name, const char* path);
|
|
|
|
protected:
|
|
SkString fName;
|
|
};
|
|
|
|
#endif // SkParticleBinding_DEFINED
|