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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#pragma once
#include <string>
#include <variant>
#include "impeller/core/device_buffer.h"
#include "impeller/core/texture.h"
#include "impeller/renderer/blit_command.h"
namespace impeller {
class HostBuffer;
class Allocator;
//------------------------------------------------------------------------------
/// @brief Blit passes encode blit into the underlying command buffer.
///
/// Blit passes can be obtained from the command buffer in which
/// the pass is meant to encode commands into.
///
/// @see `CommandBuffer`
///
class BlitPass {
public:
virtual ~BlitPass();
virtual bool IsValid() const = 0;
void SetLabel(std::string label);
HostBuffer& GetTransientsBuffer();
//----------------------------------------------------------------------------
/// @brief Record a command to copy the contents of one texture to
/// another texture. The blit area is limited by the intersection
/// of the texture coverage with respect the source region and
/// destination origin.
/// No work is encoded into the command buffer at this time.
///
/// @param[in] source The texture to read for copying.
/// @param[in] destination The texture to overwrite using the source
/// contents.
/// @param[in] source_region The optional region of the source texture
/// to use for copying. If not specified, the
/// full size of the source texture is used.
/// @param[in] destination_origin The origin to start writing to in the
/// destination texture.
/// @param[in] label The optional debug label to give the
/// command.
///
/// @return If the command was valid for subsequent commitment.
///
bool AddCopy(std::shared_ptr<Texture> source,
std::shared_ptr<Texture> destination,
std::optional<IRect> source_region = std::nullopt,
IPoint destination_origin = {},
std::string label = "");
//----------------------------------------------------------------------------
/// @brief Record a command to copy the contents of the buffer to
/// the texture.
/// No work is encoded into the command buffer at this time.
///
/// @param[in] source The texture to read for copying.
/// @param[in] destination The buffer to overwrite using the source
/// contents.
/// @param[in] source_region The optional region of the source texture
/// to use for copying. If not specified, the
/// full size of the source texture is used.
/// @param[in] destination_origin The origin to start writing to in the
/// destination texture.
/// @param[in] label The optional debug label to give the
/// command.
///
/// @return If the command was valid for subsequent commitment.
///
bool AddCopy(std::shared_ptr<Texture> source,
std::shared_ptr<DeviceBuffer> destination,
std::optional<IRect> source_region = std::nullopt,
size_t destination_offset = 0,
std::string label = "");
//----------------------------------------------------------------------------
/// @brief Record a command to copy the contents of the buffer to
/// the texture.
/// No work is encoded into the command buffer at this time.
///
/// @param[in] source The buffer view to read for copying.
/// @param[in] destination The texture to overwrite using the source
/// contents.
/// @param[in] destination_offset The offset to start writing to in the
/// destination buffer.
/// @param[in] label The optional debug label to give the
/// command.
///
/// @return If the command was valid for subsequent commitment.
///
bool AddCopy(BufferView source,
std::shared_ptr<Texture> destination,
IPoint destination_origin = {},
std::string label = "");
//----------------------------------------------------------------------------
/// @brief Record a command to generate all mip levels for a texture.
/// No work is encoded into the command buffer at this time.
///
/// @param[in] texture The texture to generate mipmaps for.
/// @param[in] label The optional debug label to give the command.
///
/// @return If the command was valid for subsequent commitment.
///
bool GenerateMipmap(std::shared_ptr<Texture> texture, std::string label = "");
//----------------------------------------------------------------------------
/// @brief Encode the recorded commands to the underlying command buffer.
///
/// @param transients_allocator The transients allocator.
///
/// @return If the commands were encoded to the underlying command
/// buffer.
///
virtual bool EncodeCommands(
const std::shared_ptr<Allocator>& transients_allocator) const = 0;
protected:
std::shared_ptr<HostBuffer> transients_buffer_;
explicit BlitPass();
virtual void OnSetLabel(std::string label) = 0;
virtual bool OnCopyTextureToTextureCommand(
std::shared_ptr<Texture> source,
std::shared_ptr<Texture> destination,
IRect source_region,
IPoint destination_origin,
std::string label) = 0;
virtual bool OnCopyTextureToBufferCommand(
std::shared_ptr<Texture> source,
std::shared_ptr<DeviceBuffer> destination,
IRect source_region,
size_t destination_offset,
std::string label) = 0;
virtual bool OnCopyBufferToTextureCommand(
BufferView source,
std::shared_ptr<Texture> destination,
IPoint destination_origin,
std::string label) = 0;
virtual bool OnGenerateMipmapCommand(std::shared_ptr<Texture> texture,
std::string label) = 0;
private:
FML_DISALLOW_COPY_AND_ASSIGN(BlitPass);
};
} // namespace impeller