ProvokingVertexHelper.h

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//

// Copyright 2021 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.

//

// ProvokingVertexHelper.h:

//    Manages re-writing index buffers when provoking vertex support is needed.

//    Handles points, lines, triangles, line strips, and triangle strips.

//    Line loops, and triangle fans should be pre-processed.

//

#ifndef LIBANGLE_RENDERER_METAL_PROVOKINGVERTEXHELPER_H

#define LIBANGLE_RENDERER_METAL_PROVOKINGVERTEXHELPER_H

#include "libANGLE/Context.h"

#include "libANGLE/renderer/ContextImpl.h"

#include "libANGLE/renderer/metal/DisplayMtl.h"

#include "libANGLE/renderer/metal/mtl_buffer_pool.h"

#include "libANGLE/renderer/metal/mtl_command_buffer.h"

#include "libANGLE/renderer/metal/mtl_context_device.h"

#include "libANGLE/renderer/metal/mtl_state_cache.h"

namespace rx

class ContextMtl;

class ProvokingVertexHelper : angle::NonCopyable

  public:

    ProvokingVertexHelper(ContextMtl *context);

    angle::Result preconditionIndexBuffer(ContextMtl *context,

                                          mtl::BufferRef indexBuffer,

                                          GLsizei indexCount,

                                          size_t indexOffset,

                                          bool primitiveRestartEnabled,

                                          gl::PrimitiveMode primitiveMode,

                                          gl::DrawElementsType elementsType,

                                          uint32_t &outIndexCount,

                                          size_t &outIndexOffset,

                                          gl::PrimitiveMode &outPrimitiveMode,

                                          mtl::BufferRef &outNewBuffer);

    angle::Result generateIndexBuffer(ContextMtl *context,

                                      size_t first,

                                      GLsizei indexCount,

                                      gl::PrimitiveMode primitiveMode,

                                      gl::DrawElementsType elementsType,

                                      uint32_t &outIndexCount,

                                      size_t &outIndexOffset,

                                      gl::PrimitiveMode &outPrimitiveMode,

                                      mtl::BufferRef &outNewBuffer);

    void releaseInFlightBuffers(ContextMtl *contextMtl);

    void ensureCommandBufferReady();

    void onDestroy(ContextMtl *context);

    mtl::ComputeCommandEncoder *getComputeCommandEncoder();

  private:

    angle::Result prepareCommandEncoderForFunction(ContextMtl *context,

                                                   mtl::ComputeCommandEncoder *encoder,

                                                   uint32_t indexBufferKey,

                                                   bool isForGenerateIndices);

    mtl::BufferPool mIndexBuffers;

    std::unordered_map<uint32_t, angle::ObjCPtr<id<MTLFunction>>> mFixIndexBufferFunctions;

    std::unordered_map<uint32_t, angle::ObjCPtr<id<MTLFunction>>> mGenIndexBufferFunctions;

};

}  // namespace rx

#endif /* LIBANGLE_RENDERER_METAL_PROVOKINGVERTEXHELPER_H */