vk_shader_interface.hh

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

 
#pragma once
 
#include "BLI_array.hh"
 
#include "gpu_shader_create_info.hh"
#include "gpu_shader_interface.hh"
 
#include "BLI_array.hh"
 
#include "vk_descriptor_set_layouts.hh"
#include "vk_push_constants.hh"
 
namespace blender::gpu {

enum VKBindType {
  UNIFORM_BUFFER = 0,
  STORAGE_BUFFER,
  SAMPLER,
  IMAGE,
  INPUT_ATTACHMENT,
};
 
struct VKResourceBinding {
  VKBindType bind_type = VKBindType::UNIFORM_BUFFER;
  int binding = -1;
 
  VKDescriptorSet::Location location;
  VKImageViewArrayed arrayed = VKImageViewArrayed::DONT_CARE;
  VkAccessFlags access_mask = VK_ACCESS_NONE;
};
 
class VKShaderInterface : public ShaderInterface {
 private:
  Array<VKResourceBinding> resource_bindings_;
  VKDescriptorSetLayoutInfo descriptor_set_layout_info_;
 
  VKPushConstants::Layout push_constants_layout_;
 
  shader::BuiltinBits shader_builtins_;
 
 public:
  VKShaderInterface() = default;
 
  void init(const shader::ShaderCreateInfo &info);
 
  const VKDescriptorSet::Location descriptor_set_location(
      const shader::ShaderCreateInfo::Resource &resource) const;
  const std::optional<VKDescriptorSet::Location> descriptor_set_location(
      const shader::ShaderCreateInfo::Resource::BindType &bind_type, int binding) const;

  const VKPushConstants::Layout &push_constants_layout_get() const
  {
    return push_constants_layout_;
  }
 
  const VKDescriptorSetLayoutInfo &descriptor_set_layout_info_get() const
  {
    return descriptor_set_layout_info_;
  }
 
  shader::Type get_attribute_type(int location) const
  {
    return static_cast<shader::Type>(attr_types_[location]);
  }
 
  bool is_point_shader() const
  {
    return (shader_builtins_ & shader::BuiltinBits::POINT_SIZE) == shader::BuiltinBits::POINT_SIZE;
  }
 
  const Span<VKResourceBinding> resource_bindings_get() const
  {
    return resource_bindings_;
  }
 
 private:
  void init_descriptor_set_layout_info(const shader::ShaderCreateInfo &info,
                                       int64_t resources_len,
                                       Span<shader::ShaderCreateInfo::Resource> resources,
                                       VKPushConstants::StorageType push_constants_storage);
  const ShaderInput *shader_input_get(const shader::ShaderCreateInfo::Resource &resource) const;
  const ShaderInput *shader_input_get(
      const shader::ShaderCreateInfo::Resource::BindType &bind_type, int binding) const;
  const VKResourceBinding &resource_binding_info(const ShaderInput *shader_input) const;
 
  void descriptor_set_location_update(
      const ShaderInput *shader_input,
      const VKDescriptorSet::Location location,
      const VKBindType bind_type,
      std::optional<const shader::ShaderCreateInfo::Resource> resource,
      VKImageViewArrayed arrayed);
};
 
}  // namespace blender::gpu