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像素着色器替代了固定渲染管线的 多纹理化 阶段(书上说的)

这是片面的,不完善的,  其实像素着色器,只要渲染到屏幕上,那就有像素这个东西,就要有像素着色器.

实现步骤:

1.编写和编译像素着色器文件

2.创建像素着色器

3.设置像素着色器

//文本文件代码

//--------------------------begim ps.txt---------------------------------------

//全局变量

//存储颜色混合的比例值s，其中

//Scalar.x = s

//Scalar.y = 1-s

vector Scalar;	//纹理混合比例(权重)

//纹理0; 纹理1

texture Tex0;

texture Tex1;

//纹理采样器0

sampler Samp0 = sampler_state

{

	Texture = <Tex0>;

	MipFilter = LINEAR;

	MinFilter = LINEAR;

	MagFilter = LINEAR;

};

//纹理采样器1

sampler Samp1 = sampler_state

{

	Texture = <Tex1>;

	MipFilter = LINEAR;

	MinFilter = LINEAR;

	MagFilter = LINEAR;

};

//输入两套纹理坐标

struct PS_INPUT

{

	float2 uvCoords0 : TEXCOORD0;

	float2 uvCoords1 : TEXCOORD1;

};

//输出像素颜色

struct PS_OUTPUT

{

	float4 Color : COLOR0;

};

//入口函数

PS_OUTPUT PS_Main(PS_INPUT input)

{

	PS_OUTPUT output = (PS_OUTPUT)0;

	//分别对两个纹理进行采样按照比例混合后输出颜色值

	output.Color = tex2D(Samp0, input.uvCoords0)*Scalar.x + tex2D(Samp1, input.uvCoords1)*Scalar.y;

	return output;

}

//--------------------------end ps.txt---------------------------------------

vs程序中源代码:

 

	//setup

	void Setup()

	{

		HRESULT hr = 0;

		//创建顶点缓存

		m_d3dDevice->GetD3DDevice()->CreateVertexBuffer(

			4 * sizeof(MultiTexVertex),

			D3DUSAGE_WRITEONLY,

			MultiTexVertex::FVF,

			D3DPOOL_MANAGED,

			&quadVB,

			0);

		//填充顶点缓存

		MultiTexVertex* v = 0;

		quadVB->Lock(0, 0, (void**)&v, 0);

		v[0] = MultiTexVertex(-3.0f, -3.0f, 10.0f, 0.0f, 1.0f, 0.0f, 1.0f);

		v[1] = MultiTexVertex(-3.0f,  3.0f, 10.0f, 0.0f, 0.0f, 0.0f, 0.0f);

		v[2] = MultiTexVertex( 3.0f, -3.0f, 10.0f, 1.0f, 1.0f, 1.0f, 1.0f);

		v[3] = MultiTexVertex( 3.0f,  3.0f, 10.0f, 1.0f, 0.0f, 1.0f, 0.0f);

		quadVB->Unlock();

		//加载纹理:

		D3DXCreateTextureFromFile(D3DDevice, L"D:\\pic1.png", &quadTexture0);

		D3DXCreateTextureFromFile(m_d3dDevice->D3DDevice, L"D:\\pic2.png", &quadTexture1);

		//编译像素着色器:

		//创建像素着色器

		ID3DXBuffer* codeBuffer = 0;

		ID3DXBuffer* errorBuffer = 0;

		hr = D3DXCompileShaderFromFile(

			L"D:\\ps.txt",

			0,

			0,

			"PS_Main", // entry point function name

			"ps_2_0",

			D3DXSHADER_ENABLE_BACKWARDS_COMPATIBILITY,

			&codeBuffer,

			&errorBuffer,

			&pixelConstTable);

		// 输出错误信息:

		if (errorBuffer)

		{

			string str = (char*)errorBuffer->GetBufferPointer();

			MessageBox(NULL, Common::StringToWString(str).c_str(), L"ERROR", MB_OK);

			//safe_release<ID3DXBuffer*>(error_buffer);

		}

		if (FAILED(hr))

		{

			MessageBox(NULL, L"D3DXCreateEffectFromFile() - FAILED", L"ERROR", MB_OK);

		}

		//创建像素着色器

		hr = D3DDevice->CreatePixelShader((DWORD*)codeBuffer->GetBufferPointer(), &pixelShader);

		if (FAILED(hr))

		{

			MessageBox(NULL, L"CreateVertexShader - FAILED", L"ERROR", MB_OK);

		}

		//释放

		//safe_release<ID3DXBuffer*>(shader_buffer);

		//设置投影矩阵

		D3DXMATRIX p;

		RECT rt;

		GetClientRect(Application::GetInstance()->GetWnd(), &rt);

		D3DXMatrixPerspectiveFovLH(&p, D3DX_PI * 0.25f, (float)rt.right / rt.bottom, 1.0f, 1000.0f);

		D3DDevice->SetTransform(D3DTS_PROJECTION, &p);

		//禁用灯光

		D3DDevice->SetRenderState(D3DRS_LIGHTING, false);

		//得到各常量句柄

		ScalarHandle = pixelConstTable->GetConstantByName(0, "Scalar");

		Samp0Handle = pixelConstTable->GetConstantByName(0, "Samp0");

		Samp1Handle = pixelConstTable->GetConstantByName(0, "Samp1");

		//设置对着色器变量Samp0、Samp1的描述

		UINT count;

		pixelConstTable->GetConstantDesc(Samp0Handle, &Samp0Desc, &count);

		pixelConstTable->GetConstantDesc(Samp1Handle, &Samp1Desc, &count);

		//设定各着色器变量为初始值

		pixelConstTable->SetDefaults(D3DDevice);

	}

	//display : 设置像素着色器,取用2张纹理,并在渲染前设置对应采样状态

	void Display(float timeDelta)

	{

		// render now

		D3DDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, 0x00000000, 1.0f, 0);

		D3DDevice->BeginScene();

		//为着色器全局变量Scalar赋值

		D3DXVECTOR4 scalar(0.5f, 0.5f, 0.0f, 1.0f);//一半一半混合

		pixelConstTable->SetVector(D3DDevice, ScalarHandle, &scalar);

		//设置像素着色器

		D3DDevice->SetPixelShader(pixelShader);

		//设置定点格式、绑定数据流

		D3DDevice->SetFVF(MultiTexVertex::FVF);

		D3DDevice->SetStreamSource(0, quadVB, 0, sizeof(MultiTexVertex));

		//设置第一、二层纹理

		D3DDevice->SetTexture(Samp0Desc.RegisterIndex, quadTexture0);

		D3DDevice->SetTexture(Samp1Desc.RegisterIndex, quadTexture1);

		//绘制图形

		D3DDevice->DrawPrimitive(D3DPT_TRIANGLESTRIP, 0, 2);

		D3DDevice->EndScene();

		D3DDevice->Present(NULL, NULL, NULL, NULL);

	}

 

 

 

 

代码来自 博客下载:HLSL初级教程.

效果图:纹理1,2:

混合效果: