Question

基本上，绘制的矩形是黑色的，这意味着输入到RenderColorBox着色器方法的UV坐标始终为零。绝对是UV坐标，因为我可以很好地更改着色器的输出颜色。使用return float4(1,0,0, 1);会导致出现一个红色矩形。

着色器代码：

struct VSOUT
    {
        float4 vertPos : POSITION;
        float2 UVCoord : TEXCOORD0;
    };

float4 RenderColorBox(VSOUT IN) : COLOR0
 {
     float2 uvCoord = IN.UVCoord;
     // Go from black to red as x UV increases rightward.
     return float4(uvCoord.x,0,0, 1);
}

相关的Shader创建C ++

ID3DXBuffer* errors = 0;
    LPD3DXBUFFER dxShaderCode = 0x0;;
    LPD3DXCONSTANTTABLE constantTable;
    if (FAILED(D3DXCompileShaderFromFileA(GetShaderPath().c_str(), NULL, NULL, "RenderColorBox", "ps_3_0", 0, &dxShaderCode, &errors, &constantTable))) {
        if (errors) {
            MessageBoxA(NULL, (char*)errors->GetBufferPointer(), "Shader Compilation Error!", MB_ICONERROR);
            errors->Release();
        }


        oaassert(false);
    }

    if (errors)
        errors->Release();

    oaassert_hresult(pDevice->CreatePixelShader((DWORD*)dxShaderCode->GetBufferPointer(), &pPixelShader));

和绘图：

// FVF : (D3DFVF_XYZ|D3DFVF_DIFFUSE|D3DFVF_TEX1)
struct IMDRAWLISTVERTEX
{
    float    pos[3];
    D3DCOLOR col;
    float    uv[2];
};

IMDRAWLISTVERTEX rectVertices[4];

            OAVec2 startPos = drawData->posSize.ConvertToVec2()[0];
            OAVec2 rectSize = drawData->posSize.ConvertToVec2()[1];


            IMDRAWLISTVERTEX quad[4] = {
                CreateImVertex(startPos, 0, 0),
                CreateImVertex(startPos + rectSize.GetHorizVector(), 1, 0),
                CreateImVertex(startPos + rectSize.GetVertVector(), 0, 1),
                CreateImVertex(startPos + rectSize, 1, 1)
            };

            auto pixelShader = drawData->shader->pPixelShader;

            pDevice->SetPixelShader(pixelShader);

            pDevice->DrawPrimitiveUP(D3DPRIMITIVETYPE::D3DPT_TRIANGLESTRIP, 2, &quad, sizeof(quad[0]));

            pDevice->SetPixelShader(NULL);

以及在绘制之前设置的设备渲染状态（我认为这可能是问题所在，但似乎找不到任何有效的方法）

pDevice->SetPixelShader(NULL);
    pDevice->SetVertexShader(NULL);
    pDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_NONE);
    pDevice->SetRenderState(D3DRS_LIGHTING, false);
    pDevice->SetRenderState(D3DRS_ZENABLE, false);
    pDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, true);
    pDevice->SetRenderState(D3DRS_ALPHATESTENABLE, false);
    pDevice->SetRenderState(D3DRS_BLENDOP, D3DBLENDOP_ADD);
    pDevice->SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCALPHA);
    pDevice->SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA);
    pDevice->SetRenderState(D3DRS_SCISSORTESTENABLE, true);
    pDevice->SetRenderState(D3DRS_SHADEMODE, D3DSHADE_GOURAUD);
    pDevice->SetTextureStageState(0, D3DTSS_COLOROP, D3DTOP_MODULATE);
    pDevice->SetTextureStageState(0, D3DTSS_COLORARG1, D3DTA_TEXTURE);
    pDevice->SetTextureStageState(0, D3DTSS_COLORARG2, D3DTA_DIFFUSE);
    pDevice->SetTextureStageState(0, D3DTSS_ALPHAOP, D3DTOP_MODULATE);
    pDevice->SetTextureStageState(0, D3DTSS_ALPHAARG1, D3DTA_TEXTURE);
    pDevice->SetTextureStageState(0, D3DTSS_ALPHAARG2, D3DTA_DIFFUSE);
    pDevice->SetSamplerState(0, D3DSAMP_MINFILTER, D3DTEXF_LINEAR);
    pDevice->SetSamplerState(0, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR);

修改我能够通过使用另一个项目中的顶点声明代码来解决此问题。我仍然不知道为什么上面的代码无法正常运行，并希望有人能为此提供可靠的答案。

const D3DVERTEXELEMENT9 vertexElements[3] = {
    { 0, 0,  D3DDECLTYPE_FLOAT3, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_POSITIONT, 0 }, 
{ 0, 12, D3DDECLTYPE_FLOAT2, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_TEXCOORD,  0 },
D3DDECL_END()
};

仅使用上述方法并调用设备函数（例如CreateVertexDeclaration，SetVertexDeclaration），然后在传递到着色器的正确uv坐标中绘制基本结果。

HLSL D3D9着色器UV值始终为零

0 个答案: