src/gpu/graphite/KeyContext.h

/*
 * Copyright 2022 Google LLC
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef skgpu_graphite_KeyContext_DEFINED
#define skgpu_graphite_KeyContext_DEFINED

#include "include/core/SkM44.h"
#include "include/core/SkMatrix.h"

namespace skgpu::graphite {

class Recorder;
class ShaderCodeDictionary;

// The key context must always be able to provide a valid ShaderCodeDictionary. Depending
// on the calling context it can also supply a backend-specific resource providing
// object (e.g., a Recorder).
class KeyContext {
public:
    // Constructor for the pre-compile code path
    KeyContext(ShaderCodeDictionary* dict) : fDictionary(dict) {}
    KeyContext(Recorder*, const SkM44& local2Dev);
    KeyContext(const KeyContext&);

    Recorder* recorder() const { return fRecorder; }

    const SkM44& local2Dev() const { return fLocal2Dev; }
    const SkMatrix* localMatrix() const { return fLocalMatrix; }

    ShaderCodeDictionary* dict() const { return fDictionary; }

protected:
    Recorder* fRecorder = nullptr;
    SkM44 fLocal2Dev;
    SkMatrix* fLocalMatrix = nullptr;
    ShaderCodeDictionary* fDictionary;
};

class KeyContextWithLocalMatrix : public KeyContext {
public:
    KeyContextWithLocalMatrix(const KeyContext& other, const SkMatrix& childLM)
            : KeyContext(other) {
        if (fLocalMatrix) {
            fStorage = SkMatrix::Concat(childLM, *fLocalMatrix);
        } else {
            fStorage = childLM;
        }

        fLocalMatrix = &fStorage;
    }

private:
    KeyContextWithLocalMatrix(const KeyContextWithLocalMatrix&) = delete;
    KeyContextWithLocalMatrix& operator=(const KeyContextWithLocalMatrix&) = delete;

    SkMatrix fStorage;
};

} // namespace skgpu::graphite

#endif // skgpu_graphite_KeyContext_DEFINED