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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 "impeller/renderer/command.h"
#include "impeller/renderer/render_target.h"
namespace impeller {
class HostBuffer;
class Allocator;
//------------------------------------------------------------------------------
/// @brief Render passes encode render commands directed as one specific
/// render target into an underlying command buffer.
///
/// Render passes can be obtained from the command buffer in which
/// the pass is meant to encode commands into.
///
/// @see `CommandBuffer`
///
class RenderPass {
public:
virtual ~RenderPass();
const RenderTarget& GetRenderTarget() const;
ISize GetRenderTargetSize() const;
virtual bool IsValid() const = 0;
void SetLabel(std::string label);
HostBuffer& GetTransientsBuffer();
//----------------------------------------------------------------------------
/// @brief Record a command for subsequent encoding to the underlying
/// command buffer. No work is encoded into the command buffer at
/// this time.
///
/// @param[in] command The command
///
/// @return If the command was valid for subsequent commitment.
///
bool AddCommand(Command command);
//----------------------------------------------------------------------------
/// @brief Encode the recorded commands to the underlying command buffer.
///
/// @return If the commands were encoded to the underlying command
/// buffer.
///
bool EncodeCommands() const;
protected:
const std::weak_ptr<const Context> context_;
const RenderTarget render_target_;
std::shared_ptr<HostBuffer> transients_buffer_;
std::vector<Command> commands_;
RenderPass(std::weak_ptr<const Context> context, const RenderTarget& target);
virtual void OnSetLabel(std::string label) = 0;
virtual bool OnEncodeCommands(const Context& context) const = 0;
private:
FML_DISALLOW_COPY_AND_ASSIGN(RenderPass);
};
} // namespace impeller