IRenderTargets.h

#pragma once
 
#include "Common.h"
#include "DataFormat.h"
#include "RasterizerState.h"
#include "DepthStencilState.h"
#include "BlendState.h"
 
#include "Foundation/StringView.h"
 
namespace Cogs
{
  struct RenderTargetViewDescription
  {
    TextureHandle texture;
    uint16_t layerIndex;
    uint16_t numLayers;
    uint8_t levelIndex;
  };
 
  struct DepthStencilViewDescription
  {
    TextureHandle texture;
    uint16_t layerIndex;
    uint16_t numLayers;
    uint8_t levelIndex;
  };
 
  struct MultiViewDescription {
    uint8_t samples;
    uint8_t baseIndex;
    uint8_t count;
  };
 
 
  struct RenderTargetLayout
  {
    TextureFormat colorFormats[8] = {};
    TextureFormat depthStencilFormat = TextureFormat::Unknown;
    uint8_t numColorTargets = 0;
    uint8_t samples = 1;
  };
 
  struct IRenderTargets
  {
    virtual void annotate(RenderTargetHandle handle, const StringView& name) { (void)handle; (void)name; }
 
    virtual void annotate(DepthStencilHandle handle, const StringView& name) { (void)handle; (void)name; }
 
    virtual RenderTargetHandle createRenderTarget(TextureHandle textureHandle)
    {
      return createRenderTarget(&textureHandle, 1);
    }
 
    virtual RenderTargetHandle createRenderTarget(TextureHandle * textureHandles, const size_t numTextureHandles)
    {
      RenderTargetViewDescription view_desc[8] = {};
      for(size_t i=0; i<numTextureHandles; i++){
        view_desc[i].texture = textureHandles[i];
        view_desc[i].layerIndex = 0;
        view_desc[i].numLayers = 1;
        view_desc[i].levelIndex = 0;
      }
      return createRenderTarget(view_desc, numTextureHandles);
    }
 
    virtual RenderTargetHandle createRenderTarget(const RenderTargetViewDescription * renderTargetViews, const size_t numViews) = 0;
 
    virtual RenderTargetHandle createRenderTarget(const RenderTargetViewDescription* /*renderTargetViews*/, const size_t /*numViews*/, const MultiViewDescription& /*multiView*/)
    {
      return RenderTargetHandle::InvalidHandle;
    }
 
    virtual void releaseRenderTarget(RenderTargetHandle renderTargetHandle) = 0;
 
    virtual RenderTargetLayout getLayout(const RenderTargetHandle renderTargetHandle, const DepthStencilHandle depthStencilHandle) = 0;
 
    virtual DepthStencilHandle createDepthStencilTarget(const RenderTargetHandle handle) = 0;
    
    virtual DepthStencilHandle createDepthStencilTarget(const RenderTargetHandle handle, const TextureHandle textureHandle) = 0;
 
    virtual DepthStencilHandle createDepthStencilTarget(const RenderTargetHandle handle, const DepthStencilViewDescription & depthStencilView) = 0;
 
 
    virtual DepthStencilHandle createDepthStencilTarget(const RenderTargetHandle /*handle*/, const DepthStencilViewDescription& /*depthStencilView*/, const MultiViewDescription& /*multiView*/)
    {
      return DepthStencilHandle::InvalidHandle;
    }
 
    virtual void releaseDepthStencilTarget(DepthStencilHandle depthStencilHandle) = 0;
 
    virtual DepthStencilStateHandle loadDepthStencilState(const DepthStencilState & depthStencilState) = 0;
 
    virtual void releaseDepthStencilState(DepthStencilStateHandle handle) = 0;
 
    virtual RasterizerStateHandle loadRasterizerState(const RasterizerState & rasterizerState) = 0;
    
    virtual void releaseRasterizerState(RasterizerStateHandle handle) = 0;
 
    virtual BlendStateHandle loadBlendState(const BlendState & blendState) = 0;
 
    virtual BlendStateHandle loadBlendState(const BlendState& blendStateColor, const BlendState& /*blendStateAlpha*/) { return loadBlendState(blendStateColor); }
 
    virtual BlendStateHandle loadBlendState(const BlendState& blendStateColor, const BlendState& blendStateAlpha, const BlendFlags /*flags*/) { return loadBlendState(blendStateColor, blendStateAlpha); }
 
    virtual BlendStateHandle loadBlendState(const BlendState* /*blendStateColor*/, const BlendState* /*blendStateAlpha*/, const uint32_t /*numBlendStates*/, const BlendFlags /*flags*/) { return BlendStateHandle::NoHandle; }
 
    virtual void releaseBlendState(BlendStateHandle handle) = 0;
 
    virtual void releaseResources() = 0;
  };
}