src/libANGLE/renderer/renderer_utils.h

//
// Copyright 2016 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// renderer_utils:
//   Helper methods pertaining to most or all back-ends.
//

#ifndef LIBANGLE_RENDERER_RENDERER_UTILS_H_
#define LIBANGLE_RENDERER_RENDERER_UTILS_H_

#include <cstdint>

#include <limits>
#include <map>

#include "common/angleutils.h"
#include "libANGLE/angletypes.h"

namespace angle
{
struct Format;
}

namespace gl
{
struct FormatType;
struct InternalFormat;
}

namespace rx
{

class ResourceSerial
{
  public:
    constexpr ResourceSerial() : mValue(kDirty) {}
    constexpr ResourceSerial(uintptr_t value) : mValue(value) {}
    constexpr bool operator==(ResourceSerial other) const { return mValue == other.mValue; }
    constexpr bool operator!=(ResourceSerial other) const { return mValue != other.mValue; }

    void dirty() { mValue = kDirty; }

  private:
    constexpr static uintptr_t kDirty = std::numeric_limits<uintptr_t>::max();

    uintptr_t mValue;
};

class SerialFactory;

class Serial final
{
  public:
    constexpr Serial() : mValue(0) {}
    constexpr Serial(const Serial &other) = default;
    Serial &operator=(const Serial &other) = default;

    constexpr bool operator==(const Serial &other) const { return mValue == other.mValue; }
    constexpr bool operator!=(const Serial &other) const { return mValue != other.mValue; }
    constexpr bool operator>(const Serial &other) const { return mValue > other.mValue; }
    constexpr bool operator>=(const Serial &other) const { return mValue >= other.mValue; }
    constexpr bool operator<(const Serial &other) const { return mValue < other.mValue; }
    constexpr bool operator<=(const Serial &other) const { return mValue <= other.mValue; }

  private:
    friend class SerialFactory;
    constexpr explicit Serial(uint64_t value) : mValue(value) {}
    uint64_t mValue;
};

class SerialFactory final : angle::NonCopyable
{
  public:
    SerialFactory() : mSerial(1) {}

    Serial generate()
    {
        ASSERT(mSerial != std::numeric_limits<uint64_t>::max());
        return Serial(mSerial++);
    }

  private:
    uint64_t mSerial;
};

using MipGenerationFunction = void (*)(size_t sourceWidth,
                                       size_t sourceHeight,
                                       size_t sourceDepth,
                                       const uint8_t *sourceData,
                                       size_t sourceRowPitch,
                                       size_t sourceDepthPitch,
                                       uint8_t *destData,
                                       size_t destRowPitch,
                                       size_t destDepthPitch);

typedef void (*ColorReadFunction)(const uint8_t *source, uint8_t *dest);
typedef void (*ColorWriteFunction)(const uint8_t *source, uint8_t *dest);
typedef void (*ColorCopyFunction)(const uint8_t *source, uint8_t *dest);

class FastCopyFunctionMap
{
  public:
    struct Entry
    {
        GLenum format;
        GLenum type;
        ColorCopyFunction func;
    };

    constexpr FastCopyFunctionMap() : FastCopyFunctionMap(nullptr, 0) {}

    constexpr FastCopyFunctionMap(const Entry *data, size_t size) : mSize(size), mData(data) {}

    bool has(const gl::FormatType &formatType) const;
    ColorCopyFunction get(const gl::FormatType &formatType) const;

  private:
    size_t mSize;
    const Entry *mData;
};

struct PackPixelsParams
{
    PackPixelsParams();
    PackPixelsParams(const gl::Rectangle &area,
                     GLenum format,
                     GLenum type,
                     GLuint outputPitch,
                     const gl::PixelPackState &pack,
                     ptrdiff_t offset);

    gl::Rectangle area;
    GLenum format;
    GLenum type;
    GLuint outputPitch;
    gl::Buffer *packBuffer;
    gl::PixelPackState pack;
    ptrdiff_t offset;
};

void PackPixels(const PackPixelsParams &params,
                const angle::Format &sourceFormat,
                int inputPitch,
                const uint8_t *source,
                uint8_t *destination);

ColorWriteFunction GetColorWriteFunction(const gl::FormatType &formatType);
ColorCopyFunction GetFastCopyFunction(const FastCopyFunctionMap &fastCopyFunctions,
                                      const gl::FormatType &formatType);

using InitializeTextureDataFunction = void (*)(size_t width,
                                               size_t height,
                                               size_t depth,
                                               uint8_t *output,
                                               size_t outputRowPitch,
                                               size_t outputDepthPitch);

using LoadImageFunction = void (*)(size_t width,
                                   size_t height,
                                   size_t depth,
                                   const uint8_t *input,
                                   size_t inputRowPitch,
                                   size_t inputDepthPitch,
                                   uint8_t *output,
                                   size_t outputRowPitch,
                                   size_t outputDepthPitch);

struct LoadImageFunctionInfo
{
    LoadImageFunctionInfo() : loadFunction(nullptr), requiresConversion(false) {}
    LoadImageFunctionInfo(LoadImageFunction loadFunction, bool requiresConversion)
        : loadFunction(loadFunction), requiresConversion(requiresConversion)
    {
    }

    LoadImageFunction loadFunction;
    bool requiresConversion;
};

using LoadFunctionMap = LoadImageFunctionInfo (*)(GLenum);

}  // namespace rx

#endif  // LIBANGLE_RENDERER_RENDERER_UTILS_H_