Directx11学习笔记【十一】 画一个简单的三角形--effect框架的使用

这里不再介绍effect框架的具体使用，有关effect框架使用可参考http://www.cnblogs.com/zhangbaochong/p/5475961.html

实现的功能依然是画一个简单的三角形，只不过使用了effect框架。

为了体现使用effect框架方便变量绑定的优点，我们对着色器代码做了修改，增加了一个常量float4x4 gWorldViewProj

cbuffer cbPerObject
{
    float4x4 gWorldViewProj;
};

float4 VS_Main( float4 pos : POSITION ) : SV_POSITION  

{
    pos = mul(pos,gWorldViewProj);
    return pos;  

}  

float4 PS_Main( float4 pos : SV_POSITION ) : SV_TARGET  

{  

    return float4( 1.0f, 0.0f, 0.0f, 1.0f );  

} 

technique11 ColorTech
{
    pass P0
    {
        SetVertexShader( CompileShader( vs_5_0, VS_Main() ) );
        SetGeometryShader( NULL );
        SetPixelShader( CompileShader( ps_5_0, PS_Main() ) );
    }
}

由于代码很简单，这里不再给出解释，直接看代码吧！

下面是修改后的TriangleDemo.h

 1 #pragma once
 2
 3 #include "Dx11DemoBase.h"
 4 #include "d3dx11effect.h"
 5
 6 class TriangleDemo : public Dx11DemoBase
 7 {
 8 public:
 9     TriangleDemo();
10     ~TriangleDemo();
11
12     bool LoadContent() override;
13     void UnLoadContent() override;
14
15     void Update(float dt) override;
16     void Render() override;
17
18 private:
19     ID3D11Buffer *m_pVertexBuffer;
20     ID3D11InputLayout *m_pInputLayout;
21
22     ID3DX11Effect *m_pFx;
23     ID3DX11EffectTechnique *m_pTechnique;
24     ID3DX11EffectMatrixVariable *m_pFxWorldViewProj;
25     XMFLOAT4X4 m_world;
26     XMFLOAT4X4 m_view;
27     XMFLOAT4X4 m_proj;
28
29 };

TriangleDemo.cpp

  1 #include "TriangleDemo.h"
  2
  3
  4 struct VertexPos
  5 {
  6     XMFLOAT3 pos;
  7 };
  8
  9 TriangleDemo::TriangleDemo()
 10 : m_pInputLayout(0), m_pVertexBuffer(0)
 11 {
 12     XMMATRIX I = XMMatrixIdentity();
 13     XMStoreFloat4x4(&m_world, I);
 14     XMStoreFloat4x4(&m_view, I);
 15     XMStoreFloat4x4(&m_proj, I);
 16 }
 17
 18
 19 TriangleDemo::~TriangleDemo()
 20 {
 21 }
 22
 23 void TriangleDemo::UnLoadContent()
 24 {
 25     if (m_pVertexBuffer)
 26         m_pVertexBuffer->Release();
 27     if (m_pInputLayout)
 28         m_pInputLayout->Release();
 29     if (m_pFx)
 30         m_pFx->Release();
 31     m_pVertexBuffer = 0;
 32     m_pInputLayout = 0;
 33     m_pFx = 0;
 34 }
 35
 36 bool TriangleDemo::LoadContent()
 37 {
 38     HRESULT result;
 39     VertexPos vertices[] =
 40     {
 41         XMFLOAT3(0.5f, 0.5f, 0.5f),
 42         XMFLOAT3(0.5f, -0.5f, 0.5f),
 43         XMFLOAT3(-0.5f, -0.5f, 0.5f)
 44     };
 45
 46     D3D11_BUFFER_DESC vertexDesc;
 47     ZeroMemory(&vertexDesc, sizeof(vertexDesc));
 48     vertexDesc.Usage = D3D11_USAGE_DEFAULT;
 49     vertexDesc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
 50     vertexDesc.ByteWidth = sizeof(VertexPos)* 3;
 51
 52     D3D11_SUBRESOURCE_DATA resourceData;
 53     ZeroMemory(&resourceData, sizeof(resourceData));
 54     resourceData.pSysMem = vertices;
 55
 56     result = m_pd3dDevice->CreateBuffer(&vertexDesc, &resourceData, &m_pVertexBuffer);
 57     if (FAILED(result))
 58     {
 59         return false;
 60     }
 61
 62
 63     DWORD shaderFlags = D3DCOMPILE_ENABLE_STRICTNESS;
 64 #if defined _DEBUG || defined DEBUG
 65     shaderFlags = D3DCOMPILE_DEBUG;
 66 #endif
 67
 68     ID3D10Blob *compiledShader = 0;
 69     ID3D10Blob *compilationMsgs = 0;
 70     result = D3DX11CompileFromFile("SolidColor.fx", 0, 0, 0, "fx_5_0", shaderFlags,
 71         0, 0, &compiledShader, &compilationMsgs, 0);
 72     if (compilationMsgs != 0)
 73     {
 74         MessageBox(0, (char*)compilationMsgs->GetBufferPointer(), 0, 0);
 75         compilationMsgs->Release();
 76         compilationMsgs = 0;
 77     }
 78     if (FAILED(result))
 79     {
 80         MessageBox(0, "载入着色器错误", 0, 0);
 81         return false;
 82     }
 83
 84     result = D3DX11CreateEffectFromMemory(compiledShader->GetBufferPointer(), compiledShader->GetBufferSize(),
 85         0, m_pd3dDevice, &m_pFx);
 86     compiledShader->Release();
 87     if (FAILED(result))
 88     {
 89         MessageBox(0, "载入着色器失败", 0, 0);
 90         return false;
 91     }
 92     m_pTechnique = m_pFx->GetTechniqueByName("ColorTech");
 93     m_pFxWorldViewProj = m_pFx->GetVariableByName("gWorldViewProj")->AsMatrix();
 94
 95     D3D11_INPUT_ELEMENT_DESC solidColorLayout[] =
 96     {
 97         { "POSITION", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 0, D3D11_INPUT_PER_VERTEX_DATA, 0 }
 98     };
 99     UINT numLayoutElements = ARRAYSIZE(solidColorLayout);
100     D3DX11_PASS_DESC passDesc;
101     m_pTechnique->GetPassByIndex(0)->GetDesc(&passDesc);
102
103     result = m_pd3dDevice->CreateInputLayout(solidColorLayout, numLayoutElements, passDesc.pIAInputSignature,
104         passDesc.IAInputSignatureSize, &m_pInputLayout);
105
106     return true;
107 }
108
109
110
111 void TriangleDemo::Update(float dt)
112 {
113
114 }
115
116 void TriangleDemo::Render()
117 {
118     if (m_pImmediateContext == 0)
119         return;
120     //清除渲染目标视图
121     float clearColor[4] = { 0.5f, 0.5f, 0.5f, 1.0f };//背景颜色
122     m_pImmediateContext->ClearRenderTargetView(m_pRenderTargetView, clearColor);
123
124     UINT stride = sizeof(VertexPos);
125     UINT offset = 0;
126     //设置数据信息格式控制信息
127     m_pImmediateContext->IASetInputLayout(m_pInputLayout);
128     //设置要绘制的几何体信息
129     m_pImmediateContext->IASetVertexBuffers(0,1,&m_pVertexBuffer,&stride,&offset);
130     //指明如何绘制三角形
131     m_pImmediateContext->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
132
133     //设置常量
134     XMMATRIX world = XMLoadFloat4x4(&m_world);
135     XMMATRIX view = XMLoadFloat4x4(&m_view);
136     XMMATRIX proj = XMLoadFloat4x4(&m_proj);
137     XMMATRIX worldViewProj = world*view*proj;
138     m_pFxWorldViewProj->SetMatrix(reinterpret_cast<float*>(&worldViewProj));
139
140     D3DX11_TECHNIQUE_DESC techDesc;
141     m_pTechnique->GetDesc(&techDesc);
142     for (UINT i = 0; i < techDesc.Passes; ++i)
143     {
144         m_pTechnique->GetPassByIndex(i)->Apply(0, m_pImmediateContext);
145         m_pImmediateContext->Draw(3, 0);
146     }
147     //马上输出
148     m_pSwapChain->Present(0, 0);
149 }

运行结果同之前的一样，不再贴图了