这个类是用来创建着色器并设置输入布局的。
这个类比较特殊，它创建的着色器与Effect文件有关，effect文件是用高级着色语言（hlsl）编写的。
shadersclass.h
1 #pragma once
2 #include <d3d11.h>
3 #include <d3dcompiler.h>
4 #include <D3DX11.h>
5 #include <xnamath.h>
6
7 #pragma comment(lib,"d3dx11.lib")
8 #pragma comment(lib,"d3d11.lib")
9 #pragma comment(lib,"d3dcompiler.lib")
10 class shaderclass
11 {
12 public:
13 shaderclass();
14 ~shaderclass();
15 bool Initialize(ID3D11Device *device, ID3D11DeviceContext* context);
16 void Shutdown();
17 private:
18 bool CompileShaderFromFile(WCHAR* szFileName, LPCSTR szEntryPoint, LPCSTR szShaderModel, ID3DBlob** ppBlobOut);
19 private:
20 ID3DBlob* m_vsblob,*m_psblob;
21 ID3D11PixelShader *m_pixelshader;
22 ID3D11VertexShader *m_vertexshader;
23 ID3D11InputLayout *m_layout;
24 public:
25 void GetShaders(ID3D11VertexShader*& vs, ID3D11PixelShader*& ps);
26 };
这个着色器类比较简单，只创建了顶点着色器和像素着色器，还设置了一个简单的输入布局，这些工作都由Initialize()函数来做，私有函数CompileShaderFromFile()函数则是用来将effect文件编译成二进制文件的，GetShaders()则是用来获取创建好的着色器对象的。
shaderclass.cpp
1 #include "shaderclass.h"
2
3
4 shaderclass::shaderclass()
5 {
6 }
7
8
9 shaderclass::~shaderclass()
10 {
11 }
12
13 bool shaderclass::Initialize(ID3D11Device *device,ID3D11DeviceContext* context)
14 {
15 HRESULT hr = S_OK;
16 bool result = CompileShaderFromFile(L"shader.fx", "VS", "vs_4_0", &m_vsblob);
17 if (!result)
18 {
19 MessageBox(NULL,
20 L"The FX file cannot be compiled. Please run this executable from the directory that contains the FX file.", L"Error", MB_OK);
21 return false;
22 }
23
24 hr = device->CreateVertexShader(m_vsblob->GetBufferPointer(), m_vsblob->GetBufferSize(), NULL, &m_vertexshader);
25 if (FAILED(hr))
26 {
27 return false;
28 }
29
30 result = CompileShaderFromFile(L"shader.fx", "PS", "ps_4_0", &m_psblob);
31 if (!result)
32 {
33 MessageBox(NULL,
34 L"The FX file cannot be compiled. Please run this executable from the directory that contains the FX file.", L"Error", MB_OK);
35 return false;
36 }
37
38 hr = device->CreatePixelShader(m_psblob->GetBufferPointer(), m_psblob->GetBufferSize(), NULL, &m_pixelshader);
39 if (FAILED(hr))
40 {
41 return false;
42 }
43 D3D11_INPUT_ELEMENT_DESC layout[] =
44 {
45 { "POSITION", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 0, D3D11_INPUT_PER_VERTEX_DATA, 0 },
46 { "TEXCOORD", 0, DXGI_FORMAT_R32G32_FLOAT, 0, 12, D3D11_INPUT_PER_VERTEX_DATA, 0 },
47 };/////////////////
48 UINT numElements = ARRAYSIZE(layout);
49
50 hr = device->CreateInputLayout(layout, numElements, m_vsblob->GetBufferPointer(),m_vsblob->GetBufferSize(), &m_layout);
51 if (FAILED(hr))
52 {
53 return false;
54 }
55 context->IASetInputLayout(m_layout);
56
57 return true;
58 }
59 void shaderclass::Shutdown()
60 {
61 if (m_layout)
62 {
63 m_layout->Release();
64 }
65 if (m_pixelshader)
66 {
67 m_pixelshader->Release();
68 }
69 if (m_psblob)
70 {
71 m_psblob->Release();
72 }
73 if (m_vertexshader)
74 {
75 m_vertexshader->Release();
76 }
77 if (m_vsblob)
78 {
79 m_vsblob->Release();
80 }
81 }
82
83 bool shaderclass::CompileShaderFromFile(WCHAR* szFileName, LPCSTR szEntryPoint, LPCSTR szShaderModel, ID3DBlob** ppBlobOut)
84 {
85 HRESULT hr = S_OK;
86
87 DWORD dwShaderFlags = D3DCOMPILE_ENABLE_STRICTNESS;
88 #if defined( DEBUG ) || defined( _DEBUG )
89 dwShaderFlags |= D3DCOMPILE_DEBUG;
90 #endif
91
92 ID3DBlob* pErrorBlob=0;
93 hr = D3DX11CompileFromFile(szFileName, NULL, NULL, szEntryPoint, szShaderModel,
94 dwShaderFlags, 0, NULL, ppBlobOut, &pErrorBlob, NULL);
95
96 if (FAILED(hr))
97 {
98 if (pErrorBlob != NULL)
99 OutputDebugStringA((char*)pErrorBlob->GetBufferPointer());
100 if (pErrorBlob) pErrorBlob->Release();
101 return false;
102 }
103 if (pErrorBlob)
104 pErrorBlob->Release();
105
106 return true;
107 }
108
109 void shaderclass::GetShaders(ID3D11VertexShader*& vs,ID3D11PixelShader*& ps)
110 {
111 vs = m_vertexshader;
112 ps = m_pixelshader;
113 }
Initialize()：
- 调用CompileShaderFromFile()函数编译effect文件里的顶点处理函数，得到二进制文件，根据二进制文件创建顶点着色器，CompileShaderFromFile()函数的第一个参数“shader.fx”就是effect文件
- 编译effect文件里的像素处理函数，得到二进制文件并创建像素着色器
- 填充输入布局描述数据结构，并创建输入布局，成功后设置输入布局
CompileShaderFromFile()： 里面只是单纯的调用dx11API D3DX11CompileFromFile()函数
整个类的编写非常简单，这只是因为我很简单的创建了两个着色器。如果要创建更复杂的着色器，还要学习很多。
另附上effect文件
shader.fx
1 Texture2D txDiffuse : register(t0);
2 SamplerState samLinear : register(s0);
3
4 cbuffer ConstantBuffer : register(b0)
5 {
6 matrix World;
7 matrix View;
8 matrix Projection;
9 }
10
11
12 struct VS_INPUT
13 {
14 float4 Pos : POSITION;
15 float4 Tex : TEXCOORD0;
16 };
17 struct PS_INPUT
18 {
19 float4 Pos : SV_POSITION;
20 float2 Tex : TEXCOORD0;
21 };
22 //--------------------------------------------------------------------------------------
23 // Vertex Shader
24 //--------------------------------------------------------------------------------------
25 PS_INPUT VS(VS_INPUT input)
26 {
27 PS_INPUT output = (PS_INPUT)0;
28 output.Pos = mul(input.Pos, World);
29 output.Pos = mul(output.Pos, View);
30 output.Pos = mul(output.Pos, Projection);
31 output.Tex = input.Tex;
32
33 return output;
34 }
35 //--------------------------------------------------------------------------------------
36 // Pixel Shader
37 //--------------------------------------------------------------------------------------
38 float4 PS(PS_INPUT input) : SV_Target
39 {
40 return txDiffuse.Sample(samLinear, input.Tex);
41 }