Question

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;
}

同样适用于OpenGL + GLSL，mix替换为lerp（我希望它是正确的）。例如，我从http://www.two-kings.de/tutorials/dxgraphics/dxgraphics18.html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（max texCount 4）。问题是：我可以看到网格（地形），但它是纯黑色。我需要设置其他东西（没有着色器，在我分配材料和光线之前它也是黑色的）？我可以传递这样的纹理吗？我可以使用sampler2D uniform（如何）执行此操作吗？

编辑：包含源，着色器，多个使用的纹理和alphamaps的示例，添加了filebeam http://fbe.am/nm4中具有法线的顶点数据。尽可能小。还包含DXErr9ab.dll以记录错误。

Answer 1

要在像素着色器中使用纹理，您可以按照以下步骤进行操作

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效果文件，effects_这里是指向ID3DXEffect的指针）

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

在渲染功能中设置纹理

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一个采样器

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

在像素着色器功能中进行采样

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

如果你安装了DirectX SDK，我建议你看看样本“BasicHLSL”，它有一个非常基本的Vertex着色器和像素着色器（包括纹理）的介绍。

如何将纹理传递给DirectX 9像素着色器？

1 个答案: