//
// 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.
//
// VertexArrayVk.h:
//    Defines the class interface for VertexArrayVk, implementing VertexArrayImpl.
//

#ifndef LIBANGLE_RENDERER_VULKAN_VERTEXARRAYVK_H_
#define LIBANGLE_RENDERER_VULKAN_VERTEXARRAYVK_H_

#include "libANGLE/renderer/VertexArrayImpl.h"
#include "libANGLE/renderer/vulkan/UtilsVk.h"
#include "libANGLE/renderer/vulkan/vk_cache_utils.h"
#include "libANGLE/renderer/vulkan/vk_helpers.h"

namespace rx
{
enum class BufferBindingDirty
{
    No,
    Yes,
};

struct AttributeRange
{
    // Stream vertex attribute start pointer address.
    uintptr_t startAddr;
    // Stream vertex attribute end pointer address.
    uintptr_t endAddr;
    // Stream vertex attribute first used pointer address.
    // ie. startAddr + startVertex * stride.
    uintptr_t copyStartAddr;
    AttributeRange() : startAddr(0), endAddr(0), copyStartAddr(0) {}
    AttributeRange(uintptr_t start, uintptr_t end, uintptr_t copyStart)
        : startAddr(start), endAddr(end), copyStartAddr(copyStart)
    {}
};

ANGLE_INLINE bool operator<(const AttributeRange &a, const AttributeRange &b)
{
    return a.startAddr == b.startAddr ? a.endAddr < b.endAddr : a.startAddr < b.startAddr;
}

class VertexArrayVk : public VertexArrayImpl
{
  public:
    VertexArrayVk(ContextVk *contextVk, const gl::VertexArrayState &state);
    ~VertexArrayVk() override;

    void destroy(const gl::Context *context) override;

    angle::Result syncState(const gl::Context *context,
                            const gl::VertexArray::DirtyBits &dirtyBits,
                            gl::VertexArray::DirtyAttribBitsArray *attribBits,
                            gl::VertexArray::DirtyBindingBitsArray *bindingBits) override;

    angle::Result updateActiveAttribInfo(ContextVk *contextVk);

    angle::Result updateDefaultAttrib(ContextVk *contextVk, size_t attribIndex);

    angle::Result updateStreamedAttribs(const gl::Context *context,
                                        GLint firstVertex,
                                        GLsizei vertexOrIndexCount,
                                        GLsizei instanceCount,
                                        gl::DrawElementsType indexTypeOrInvalid,
                                        const void *indices);

    angle::Result handleLineLoop(ContextVk *contextVk,
                                 GLint firstVertex,
                                 GLsizei vertexOrIndexCount,
                                 gl::DrawElementsType indexTypeOrInvalid,
                                 const void *indices,
                                 vk::BufferHelper **indexBufferOut,
                                 uint32_t *indexCountOut);

    angle::Result handleLineLoopIndexIndirect(ContextVk *contextVk,
                                              gl::DrawElementsType glIndexType,
                                              vk::BufferHelper *srcIndexBuffer,
                                              vk::BufferHelper *srcIndirectBuffer,
                                              VkDeviceSize indirectBufferOffset,
                                              vk::BufferHelper **indexBufferOut,
                                              vk::BufferHelper **indirectBufferOut);

    angle::Result handleLineLoopIndirectDraw(const gl::Context *context,
                                             vk::BufferHelper *indirectBufferVk,
                                             VkDeviceSize indirectBufferOffset,
                                             vk::BufferHelper **indexBufferOut,
                                             vk::BufferHelper **indirectBufferOut);

    const gl::AttribArray<VkBuffer> &getCurrentArrayBufferHandles() const
    {
        return mCurrentArrayBufferHandles;
    }

    const gl::AttribArray<VkDeviceSize> &getCurrentArrayBufferOffsets() const
    {
        return mCurrentArrayBufferOffsets;
    }

    const gl::AttribArray<GLuint> &getCurrentArrayBufferRelativeOffsets() const
    {
        return mCurrentArrayBufferRelativeOffsets;
    }

    const gl::AttribArray<vk::BufferHelper *> &getCurrentArrayBuffers() const
    {
        return mCurrentArrayBuffers;
    }

    const gl::AttribArray<angle::FormatID> &getCurrentArrayBufferFormats() const
    {
        return mCurrentArrayBufferFormats;
    }

    const gl::AttribArray<GLuint> &getCurrentArrayBufferStrides() const
    {
        return mCurrentArrayBufferStrides;
    }

    const gl::AttribArray<GLuint> &getCurrentArrayBufferDivisors() const
    {
        return mCurrentArrayBufferDivisors;
    }

    const gl::AttributesMask &getCurrentArrayBufferCompressed() const
    {
        return mCurrentArrayBufferCompressed;
    }

    // Update mCurrentElementArrayBuffer based on the vertex array state
    void updateCurrentElementArrayBuffer();

    vk::BufferHelper *getCurrentElementArrayBuffer() const { return mCurrentElementArrayBuffer; }

    angle::Result convertIndexBufferGPU(ContextVk *contextVk,
                                        BufferVk *bufferVk,
                                        const void *indices);

    angle::Result convertIndexBufferIndirectGPU(ContextVk *contextVk,
                                                vk::BufferHelper *srcIndirectBuf,
                                                VkDeviceSize srcIndirectBufOffset,
                                                vk::BufferHelper **indirectBufferVkOut);

    angle::Result convertIndexBufferCPU(ContextVk *contextVk,
                                        gl::DrawElementsType indexType,
                                        size_t indexCount,
                                        const void *sourcePointer,
                                        BufferBindingDirty *bufferBindingDirty);

    const gl::AttributesMask &getStreamingVertexAttribsMask() const
    {
        return mStreamingVertexAttribsMask;
    }

  private:
    gl::AttributesMask mergeClientAttribsRange(
        vk::Renderer *renderer,
        const gl::AttributesMask activeStreamedAttribs,
        size_t startVertex,
        size_t endVertex,
        std::array<AttributeRange, gl::MAX_VERTEX_ATTRIBS> &mergeRangesOut,
        std::array<size_t, gl::MAX_VERTEX_ATTRIBS> &mergedIndexesOut) const;

    angle::Result setDefaultPackedInput(ContextVk *contextVk,
                                        size_t attribIndex,
                                        angle::FormatID *formatOut);

    angle::Result convertVertexBufferGPU(ContextVk *contextVk,
                                         BufferVk *srcBuffer,
                                         VertexConversionBuffer *conversion,
                                         const angle::Format &srcFormat,
                                         const angle::Format &dstFormat);
    angle::Result convertVertexBufferCPU(ContextVk *contextVk,
                                         BufferVk *srcBuffer,
                                         VertexConversionBuffer *conversion,
                                         const angle::Format &srcFormat,
                                         const angle::Format &dstFormat,
                                         const VertexCopyFunction vertexLoadFunction);

    angle::Result syncDirtyAttrib(ContextVk *contextVk,
                                  const gl::VertexAttribute &attrib,
                                  const gl::VertexBinding &binding,
                                  size_t attribIndex,
                                  bool bufferOnly);

    gl::AttribArray<VkBuffer> mCurrentArrayBufferHandles;
    gl::AttribArray<VkDeviceSize> mCurrentArrayBufferOffsets;
    // The offset into the buffer to the first attrib
    gl::AttribArray<GLuint> mCurrentArrayBufferRelativeOffsets;
    gl::AttribArray<vk::BufferHelper *> mCurrentArrayBuffers;
    // Tracks BufferSerial of mCurrentArrayBuffers since they are always valid to access.
    gl::AttribArray<vk::BufferSerial> mCurrentArrayBufferSerial;
    // Cache strides of attributes for a fast pipeline cache update when VAOs are changed
    gl::AttribArray<angle::FormatID> mCurrentArrayBufferFormats;
    gl::AttribArray<GLuint> mCurrentArrayBufferStrides;
    gl::AttribArray<GLuint> mCurrentArrayBufferDivisors;
    gl::AttributesMask mCurrentArrayBufferCompressed;
    vk::BufferHelper *mCurrentElementArrayBuffer;

    // Cached element array buffers for improving performance.
    vk::BufferHelperQueue mCachedStreamIndexBuffers;

    ConversionBuffer mStreamedIndexData;
    ConversionBuffer mTranslatedByteIndexData;
    ConversionBuffer mTranslatedByteIndirectData;

    LineLoopHelper mLineLoopHelper;
    Optional<GLint> mLineLoopBufferFirstIndex;
    Optional<size_t> mLineLoopBufferLastIndex;
    bool mDirtyLineLoopTranslation;

    // Track client and/or emulated attribs that we have to stream their buffer contents
    gl::AttributesMask mStreamingVertexAttribsMask;

    // The attrib/binding dirty bits that requires graphics pipeline update
    gl::VertexArray::DirtyBindingBits mBindingDirtyBitsRequiresPipelineUpdate;
    gl::VertexArray::DirtyAttribBits mAttribDirtyBitsRequiresPipelineUpdate;
};
}  // namespace rx

#endif  // LIBANGLE_RENDERER_VULKAN_VERTEXARRAYVK_H_