/*
 * 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_BuiltInCodeSnippetID_DEFINED
#define skgpu_graphite_BuiltInCodeSnippetID_DEFINED

#include "include/core/SkTypes.h"

namespace skgpu::graphite {

enum class BuiltInCodeSnippetID : int32_t {
    // This isn't just a signal for a failure during paintparams key creation. It also actually
    // implements the default behavior for an erroneous draw. Currently it just draws solid
    // magenta.
    kError,

    // Snippet that passes through prior stage output
    kPriorOutput,

    // SkShader code snippets
    kSolidColorShader,
    kRGBPaintColor,
    kAlphaOnlyPaintColor,
    kLinearGradientShader4,
    kLinearGradientShader8,
    kLinearGradientShaderTexture,
    kLinearGradientShaderBuffer,
    kRadialGradientShader4,
    kRadialGradientShader8,
    kRadialGradientShaderTexture,
    kRadialGradientShaderBuffer,
    kSweepGradientShader4,
    kSweepGradientShader8,
    kSweepGradientShaderTexture,
    kSweepGradientShaderBuffer,
    kConicalGradientShader4,
    kConicalGradientShader8,
    kConicalGradientShaderTexture,
    kConicalGradientShaderBuffer,

    kLocalMatrixShader,
    kImageShader,
    kCubicImageShader,
    kHWImageShader,
    kYUVImageShader,
    kCubicYUVImageShader,
    kHWYUVImageShader,
    kHWYUVNoSwizzleImageShader,
    kCoordClampShader,
    kDitherShader,
    kPerlinNoiseShader,
    kRuntimeShader,

    // SkColorFilter code snippets
    kMatrixColorFilter,
    kTableColorFilter,
    kGaussianColorFilter,
    kColorSpaceXformColorFilter,

    // SkBlender code snippets
    kBlendShader,
    kBlendModeBlender,
    kCoeffBlender,

    // Emits special variable holding the primitiveColor emitted by a RenderStep
    kPrimitiveColor,

    // Dest Read code snippets
    kDstReadSample,
    kDstReadFetch,

    // Clip shader snippet
    // TODO(b/238763003): Avoid incorporating clip shaders into the actual shader code.
    kClipShader,

    kCompose,

    // Fixed-function blend modes are used for the final blend with the dst buffer's color when the
    // SkPaint is using a coefficient-based SkBlendMode. The actual coefficients are extracted into
    // the SkBlendInfo associated with each pipeline, but a unique code snippet ID is assigned so
    // that the pipeline keys remain distinct. They are ordered to match SkBlendMode such
    // that (id - kFirstFixedFunctionBlendMode) == SkBlendMode).
    //
    // NOTE: Pipeline code generation depends on the fixed-function code IDs being contiguous and
    // be defined last in the enum.
    kFixedFunctionClearBlendMode,
    kFixedFunctionSrcBlendMode,
    kFixedFunctionDstBlendMode,
    kFixedFunctionSrcOverBlendMode,
    kFixedFunctionDstOverBlendMode,
    kFixedFunctionSrcInBlendMode,
    kFixedFunctionDstInBlendMode,
    kFixedFunctionSrcOutBlendMode,
    kFixedFunctionDstOutBlendMode,
    kFixedFunctionSrcATopBlendMode,
    kFixedFunctionDstATopBlendMode,
    kFixedFunctionXorBlendMode,
    kFixedFunctionPlusBlendMode,
    kFixedFunctionModulateBlendMode,
    kFixedFunctionScreenBlendMode,

    kFirstFixedFunctionBlendMode = kFixedFunctionClearBlendMode,
    kLast = kFixedFunctionScreenBlendMode
};
static constexpr int kBuiltInCodeSnippetIDCount = static_cast<int>(BuiltInCodeSnippetID::kLast)+1;
static constexpr int kFixedFunctionBlendModeIDOffset =
        static_cast<int>(BuiltInCodeSnippetID::kFirstFixedFunctionBlendMode);

static_assert(BuiltInCodeSnippetID::kLast == BuiltInCodeSnippetID::kFixedFunctionScreenBlendMode);

}  // namespace skgpu::graphite

#endif // skgpu_graphite_BuiltInCodeSnippetID_DEFINED