DirectX11学习笔记十二高斯模糊描边

最新推荐文章于 2023-07-10 10:38:20 发布

理塘顶针

最新推荐文章于 2023-07-10 10:38:20 发布

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分类专栏： DirectX

本文链接：https://blog.youkuaiyun.com/MaxLykoS/article/details/106331790

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感谢Chili的教程
这一节属于PostProcessing，需要用到RenderToTexture和stencil的知识。

RenderToTexture

复习一下渲染物体可能需要绑定的组件：

组件名称	用途
ID3D11InputLayout	定义VertexBuffer的输入格式，比如Pos,TexCoord
ID3D11Buffer(as VertexBuffer)	存储要输入的顶点数据结构，坐标法线etc.
ID3D11Buffer(as IndexBuffer)	存储顶点渲染的顺序
ID3D11Buffer(as VS/PSConstantBuffer)	常量缓冲区
D3D11_PRIMITIVE_TOPOLOGY	顶点的连接方法（游戏默认三角形）
ID3D11PixelShader	像素着色器
ID3D11VertexShader	顶点着色器
ID3D11ShaderResourceView(refer to Texture2D)	2D纹理资源
ID3D11SamplerState	纹理采样器
ID3D11BlendState	像素混合
ID3D11RasterizerState	光栅化状态
*ID3D11RenderTargetView	*渲染目标
*ID3D11DepthStencilView	*深度模版缓冲
*D3D11_VIEWPORT	*视口，显示的区域大小
…	…

其中，渲染目标就是定义的整个渲染管线的输出目标（纹理），复习一下RenderTarget的定义的过程。

// create texture resource
	D3D11_TEXTURE2D_DESC textureDesc = {
   };
	// ...
	wrl::ComPtr<ID3D11Texture2D> pTexture;
	GFX_THROW_INFO(GetDevice(gfx)->CreateTexture2D(
		&textureDesc, nullptr, &pTexture
	));

	// create the resource view on the texture
	D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc = {
   };
	// ...
	GFX_THROW_INFO(GetDevice(gfx)->CreateShaderResourceView(
		pTexture.Get(), &srvDesc, &pTextureView
	));

	// create the target view on the texture
	D3D11_RENDER_TARGET_VIEW_DESC rtvDesc = {
   };
	// ...
	GFX_THROW_INFO(GetDevice(gfx)->CreateRenderTargetView(
		pTexture.Get(), &rtvDesc, &pTargetView
	));

RenderTarget的目标是一张纹理，渲染结果即保存到该纹理上，如果想将渲染结果用作其他，那么用已经跟纹理绑定好的ShaderResourceView取出即可。最后屏幕上显示的画面取决于交换链present时绑定的renderTarget。
那么一个可能的RenderTarget类可以这么写

// h
private:
	UINT width;
	UINT height;
	Microsoft::WRL::ComPtr<ID3D11ShaderResourceView> pTextureView;
	Microsoft::WRL::ComPtr<ID3D11RenderTargetView> pTargetView;

// cpp
RenderTarget::RenderTarget(Graphics& gfx, UINT width, UINT height)
	:
	width(width),
	height(height)
{
   
	// create texture resource
	D3D11_TEXTURE2D_DESC textureDesc = {
   };
	textureDesc.Width = width;
	textureDesc.Height = height;
	textureDesc.MipLevels = 1;
	textureDesc.ArraySize = 1;
	textureDesc.Format = DXGI_FORMAT_B8G8R8A8_UNORM;  // 
	textureDesc.SampleDesc.Count = 1;
	textureDesc.SampleDesc.Quality = 0;
	textureDesc.Usage = D3D11_USAGE_DEFAULT;
	textureDesc.BindFlags = D3D11_BIND_SHADER_RESOURCE | D3D11_BIND_RENDER_TARGET; // the former must exist for using RTT
	textureDesc.CPUAccessFlags = 0;
	textureDesc.MiscFlags = 0;
	wrl::ComPtr<ID3D11Texture2D> pTexture;
	GetDevice(gfx)->CreateTexture2D(
		&textureDesc, nullptr, &pTexture
	);

	// create the resource view on the texture
	D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc = {
   };
	srvDesc.Format = textureDesc.Format;
	srvDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
	srvDesc.Texture2D.MostDetailedMip = 0;
	srvDesc.Texture2D.MipLevels = 1;
	GetDevice(gfx)->CreateShaderResourceView(
		pTexture.Get(