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// Copyright 2019 The Amber Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef SRC_VULKAN_PUSH_CONSTANT_H_
#define SRC_VULKAN_PUSH_CONSTANT_H_
#include <memory>
#include <vector>
#include "amber/result.h"
#include "amber/vulkan_header.h"
#include "src/command.h"
#include "src/vulkan/resource.h"
namespace amber {
namespace vulkan {
class CommandBuffer;
class Device;
// Class to handle push constant.
class PushConstant {
public:
// |max_push_constant_size| must be the same value with
// maxPushConstantsSize of VkPhysicalDeviceLimits, which is an
// element of VkPhysicalDeviceProperties getting from
// vkGetPhysicalDeviceProperties().
PushConstant(Device* device, uint32_t max_push_constant_size);
~PushConstant();
// Return a VkPushConstantRange structure whose shader stage flag
// is VK_SHADER_STAGE_ALL, offset is minimum |offset| among elements
// in |push_constant_data_| rounded down by 4, and size is maximum
// |offset| + |size_in_bytes| among elements in |push_constant_data_|
// rounded up by 4.
VkPushConstantRange GetPushConstantRange();
// Call vkCmdPushConstants() to record a command for push constant
// if size in bytes of push constant is not larger than
// |max_push_constant_size_|. |command_buffer| is a Vulkan command
// buffer that keeps the recorded command and |pipeline_layout| is
// the graphics / compute pipeline that it currently uses.
Result RecordPushConstantVkCommand(CommandBuffer* command,
VkPipelineLayout pipeline_layout);
// Add a new set of values in an offset range to the push constants
// to be used on the next pipeline execution.
Result AddBufferData(const BufferCommand* command);
private:
// Fill memory from |offset| of |data| to |offset| + |size_in_bytes|
// of |data| with |values| of |data|.
Result UpdateMemoryWithInput(const BufferInput& input);
Device* device_;
// maxPushConstantsSize of VkPhysicalDeviceLimits, which is an
// element of VkPhysicalDeviceProperties getting from
// vkGetPhysicalDeviceProperties().
uint32_t max_push_constant_size_ = 0;
// Keep the information of what and how to conduct push constant.
// These are applied from lowest index to highest index, so that
// if address ranges overlap, then the later values take effect.
std::vector<BufferInput> push_constant_data_;
std::vector<uint8_t> memory_;
};
} // namespace vulkan
} // namespace amber
#endif // SRC_VULKAN_PUSH_CONSTANT_H_
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