"Programming Vertex and Pixel Shaders" Chapter 24 - Shadow Mapping\Shadow Map Aliased The color of shadow map of the sample is blue. Can I change the color of Shadow map to be red or green? float4 PSCreateShadowMap(float Depth : TEXCOORD0) : COLOR { return Depth; } I tried to modify the color as red(1,0,0,1), but it does not work (become white). Why? float4 PSCreateShadowMap(float Depth : TEXCOORD0) : COLOR { return float4(1,0,0,1); }

Quote:Original post by Augi
Why do you need to change color of shadow map?

That is my curious think. Because I always don't see the red shadow map, even I change the PS return color to be red. My problem is how to just generate a red shadow map(texture) in Shader.

float4 PSCreateShadowMap(float Depth : TEXCOORD0) : COLOR
{
return float4(1,0,0,1);//<== SM should to be red, but I still don't see the red SM
}

//There are some code about the texture as below:

//Create Texture for shadow map

// setup shadow map objects
V_RETURN(pd3dDevice->CreateTexture(
SHADOW_MAP_SIZE,
SHADOW_MAP_SIZE,
1,
D3DUSAGE_RENDERTARGET,
SHADOW_MAP_FORMAT,
D3DPOOL_DEFAULT,
&m_pShadowMap,
NULL
));

V_RETURN(m_pShadowMap->GetSurfaceLevel(0, &m_pShadowMapSurf));

V_RETURN(pd3dDevice->CreateDepthStencilSurface(
SHADOW_MAP_SIZE,
SHADOW_MAP_SIZE,
D3DFMT_D24S8,
D3DMULTISAMPLE_NONE,
0,
TRUE,
&m_pShadowMapZ,
NULL
));

// save old render target and set new render target with depth/stencil buffer
pd3dDevice->GetRenderTarget(0, &pOldBackBuffer);
pd3dDevice->GetDepthStencilSurface(&pOldZBuffer);
pd3dDevice->SetRenderTarget(0, m_pShadowMapSurf);
pd3dDevice->SetDepthStencilSurface(m_pShadowMapZ);

HRESULT DrawShadowMapPreview()
{
DXUTGetD3DDevice()->SetTextureStageState(0,D3DTSS_COLOROP, D3DTOP_SELECTARG1);
DXUTGetD3DDevice()->SetTextureStageState(0,D3DTSS_COLORARG1, D3DTA_TEXTURE);
DXUTGetD3DDevice()->SetTextureStageState(1,D3DTSS_COLOROP, D3DTOP_DISABLE);

float scale = 128;

typedef struct
{
FLOAT p[4];
FLOAT tu, tv;
} TVERTEX;

TVERTEX Vertex[4] =
{
// x y z rhw tu tv
{ 0, 0,0, 1, 0, 0,},
{scale, 0,0, 1, 1, 0,},
{scale,scale,0, 1, 1, 1,},
{ 0,scale,0, 1, 0, 1,},
};

DXUTGetD3DDevice()->SetTexture(0, m_pShadowMap);
DXUTGetD3DDevice()->SetVertexShader(NULL);
DXUTGetD3DDevice()->SetFVF(D3DFVF_XYZRHW | D3DFVF_TEX1);
DXUTGetD3DDevice()->SetPixelShader(0);
DXUTGetD3DDevice()->DrawPrimitiveUP(D3DPT_TRIANGLEFAN, 2, Vertex, sizeof(TVERTEX));

return (S_OK);
}