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我有像素着色器

// fxc.exe tiles.fs /T ps_3_0 /Fotiles.fsc /Fctiles.fsl

struct PSInput
{   
    float4 Pos : TEXCOORD0;
    float3 Normal : TEXCOORD1;
    float2 TexcoordUV : TEXCOORD2;
    float2 TexcoordST : TEXCOORD3;
};

sampler2D sampler0; //uniform 
sampler2D sampler1; //uniform 
sampler2D sampler2; //uniform 
sampler2D sampler3; //uniform 
sampler2D alphamap1;//uniform 
sampler2D alphamap2;//uniform 
sampler2D alphamap3;//uniform 
uniform int tex_count = 0;

uniform float4 color_ambient = float4(0.75, 0.75, 0.75, 1.0);
uniform float4 color_diffuse = float4(0.25, 0.25, 0.25, 1.0);
uniform float4 color_specular = float4(1.0, 1.0, 1.0, 1.0);
uniform float shininess = 77.0f;
uniform float3 light_position = float3(12.0f, 32.0f, 560.0f);

float4 main(PSInput In) : COLOR
{
    float3 light_direction = normalize(light_position - (float3)In.Pos);
    float3 normal = normalize(In.Normal);
    float3 half_vector = normalize(light_direction + normalize((float3)In.Pos));
    float diffuse = max(0.0, dot(normal, light_direction));
    float specular = pow(max(0.0, dot(In.Normal, half_vector)), shininess);
    float4 color = tex2D(sampler0, In.TexcoordUV);

    if (tex_count > 0){
        float4 temp = tex2D(sampler1, In.TexcoordUV);
        float4 amap = tex2D(alphamap1, In.TexcoordST);
        color = lerp(color, temp, amap.a);
    }
    if (tex_count > 1){
        float4 temp = tex2D(sampler2, In.TexcoordUV);
        float4 amap = tex2D(alphamap2, In.TexcoordST);
        color = lerp(color, temp, amap.a);
    }
    if (tex_count > 2){
        float4 temp = tex2D(sampler3, In.TexcoordUV);
        float4 amap = tex2D(alphamap3, In.TexcoordST);
        color = lerp(color, temp, amap.a);
    }
    color = color * color_ambient + diffuse * color_diffuse + specular * color_specular;

    return color;
}

顶点着色器

// fxc.exe tiles.vs /T vs_3_0 /Fotiles.vsc /Fctiles.vsl

struct VSInput
{
    float3 Pos : POSITION;
    float3 Normal : NORMAL;
    float2 TexcoordUV : TEXCOORD0;
    float2 TexcoordST : TEXCOORD1;
};

struct PSInput
{   
    float4 Pos : POSITION;
    float3 Normal : TEXCOORD0;
    float2 TexcoordUV : TEXCOORD1;
    float2 TexcoordST : TEXCOORD2;
};

uniform matrix modelMatrix;
uniform matrix projectionMatrix;
uniform matrix lookAtMatrix;

PSInput main(VSInput In)
{
    PSInput Out = (PSInput) 0;

    //projectionMatrix * lookAtMatrix * modelMatrix;
    matrix MVP = mul(modelMatrix, lookAtMatrix); 
    MVP = mul(MVP, projectionMatrix); 

    Out.Normal = mul(In.Normal, (float3x3)modelMatrix);
    Out.Pos = mul(float4(In.Pos, 1.0), MVP);    
    Out.TexcoordUV = In.TexcoordUV;
    Out.TexcoordST = In.TexcoordST;

    return Out;
}

在 OpenGL + GLSL 下同样有效，除了mix替换为lerp（我希望它是正确的）。例如来自http://www.two-kings.de/tutorials/dxgraphics/dxgraphics18.html我传递纹理：

ps_pConstantTable.SetInt(m_pD3DDevice, texCountHandle, 0);
for i := 0 to texCount - 1 do begin
  tBlp := texture_buf[cx, cy][i];
  if tBlp = nil then
      break;

  m_pD3DDevice.SetTexture(i, tBlp.itex);
  ps_pConstantTable.SetInt(m_pD3DDevice, texCountHandle, i);

  if i > 0 then begin
    // this time, use blending:
    m_pD3DDevice.SetTexture(i + 3, AlphaMaps[cx, cy][i]);
  end;
end;

所以序数纹理的索引为 0-3 和 alpha 4-6（最大 texCount 4）。问题是：我可以看到网格（地形），但它是纯黑色的。我是否需要设置其他东西（没有着色器，在我指定材质和灯光之前它也是黑色的）？我可以通过这样的纹理吗？我可以用sampler2Das uniform(how) 做到这一点吗？

编辑：带有源、着色器、几个使用的纹理和 alphamaps 的示例，添加了 filebeam http://fbe.am/nm4处的法线顶点数据。尽可能小。还包含 DXErr9ab.dll 以记录错误。

4

1 回答 1

1

要在像素着色器中使用纹理，您可以按照以下步骤操作

通过 D3DXCreateTextureFromFile 或其他函数在 C/C++ 文件中创建纹理。

if( FAILED( D3DXCreateTextureFromFile( g_pd3dDevice, "FaceTexture.jpg",
    &g_pTexture ) ) )
return E_FAIL;

声明一个 D3DXHANDLE 并将其与着色器文件中的纹理相关联。（您应该在此步骤之前编译您的效果文件，效果_这里是指向 ID3DXEffect 的指针）

texture_handle = effects->GetParameterByName(0, "FaceTexture");

在渲染函数中设置纹理

effects_->SetTexture(texture_handle, g_pTexture);

在着色器文件中声明纹理

纹理 FaceTexture；

在着色器文件中声明采样器

// Face texture sampler
sampler FaceTextureSampler = sampler_state
{
    Texture   = <FaceTexture>;
    MipFilter = LINEAR;
    MinFilter = LINEAR;
    MagFilter = LINEAR;
};

在像素着色器函数中进行采样

float4 BasicPS(OutputVS outputVS) : COLOR
{
    float4 Output;
    Output = FaceTexture.Sample(FaceTextureSampler, outputVS.texUV);
    return Output;
}

如果您安装了 DirectX SDK，我建议您查看示例“BasicHLSL”，它对顶点着色器和像素着色器（包括纹理）进行了非常基本的介绍。

于 2013-09-12T02:07:21.530 回答