/*
* 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 SkSLSlide_DEFINED
#define SkSLSlide_DEFINED

#include "include/core/SkM44.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkShader.h"
#include "include/core/SkString.h"
#include "include/effects/SkRuntimeEffect.h"
#include "include/private/base/SkTArray.h"
#include "include/private/base/SkTemplates.h"
#include "tools/viewer/Slide.h"

#include <utility>

class SkCanvas;

namespace skui {
enum class InputState;
enum class ModifierKey;
}  // namespace sk

class SkSLSlide : public Slide {
public:
    SkSLSlide();

    void draw(SkCanvas* canvas) override;
    bool animate(double nanos) override;

    void resize(SkScalar winWidth, SkScalar winHeight) override {
        fResolution = { winWidth, winHeight, 1.0f };
    }
    void load(SkScalar winWidth, SkScalar winHeight) override;
    void unload() override;

    bool onMouse(SkScalar x, SkScalar y, skui::InputState state,
                 skui::ModifierKey modifiers) override { return true; }

private:
    bool rebuild();

    SkString fSkSL;
    bool fCodeIsDirty;
    sk_sp<SkRuntimeEffect> fEffect;
    skia_private::AutoTMalloc<char> fInputs;
    skia_private::TArray<sk_sp<SkShader>> fChildren;
    float fSeconds = 0.0f;

    enum Geometry {
        kFill,
        kCircle,
        kRoundRect,
        kCapsule,
        kText,
    };
    int fGeometry = kFill;
    SkV3 fResolution = { 1, 1, 1 };
    SkV4 fMousePos;
    int fTraceCoord[2] = {64, 64};
    bool fShadertoyUniforms = true;

    // Named shaders that can be selected as inputs
    skia_private::TArray<std::pair<const char*, sk_sp<SkShader>>> fShaders;
};

#endif