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楼主 |
发表于 2009-3-11 22:57:00
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Re: 请教一下各位大大关于Shader的RenderToTarget的问题
在Nvida的文档中有这个例子:
// Relative filter weights indexed by distance (in texels) from "home" texel
// (WT_0 is the "home" or center of the filter, WT_4 is four texels away)
// Try changing these around for different filter patterns....
#define WT_0 1.0
#define WT_1 0.8
#define WT_2 0.6
#define WT_3 0.4
#define WT_4 0.2
// these ones are based on the above....
#define WT_NORMALIZE (WT_0+2.0*(WT_1+WT_2+WT_3+WT_4))
#define KW_0 (WT_0/WT_NORMALIZE)
#define KW_1 (WT_1/WT_NORMALIZE)
#define KW_2 (WT_2/WT_NORMALIZE)
#define KW_3 (WT_3/WT_NORMALIZE)
#define KW_4 (WT_4/WT_NORMALIZE)
float Script : STANDARDSGLOBAL <
string UIWidget = "none";
string ScriptClass = "scene";
string ScriptOrder = "postprocess";
string ScriptOutput = "color";
string Script = "Technique=BloomExtract;"
"Technique=BloomCombine;";
> = 0.8;
float4 ClearColor
<
string UIWidget = "color";
string UIName = "Clear (Bg) Color";
> = {0,0,0,1.0};
float2 ViewportSize : VIEWPORTPIXELSIZE
<
string UIName="Screen Size";
string UIWidget="None";
>;
static float2 ViewportOffset = (float2(0.5,0.5)/ViewportSize);
texture g_texBase : RENDERCOLORTARGET
<
float2 ViewPortRatio = {1.0,1.0};
int MipLevels = 1;
string Format = "X8R8G8B8";
string UIWidget = "None";
>;
texture g_texBloomH : RENDERCOLORTARGET
<
float2 ViewPortRatio = {1.0,1.0};
int MipLevels = 1;
string Format = "X8R8G8B8";
string UIWidget = "None";
>;
texture g_texBloomHV : RENDERCOLORTARGET
<
float2 ViewPortRatio = {1.0,1.0};
int MipLevels = 1;
string Format = "X8R8G8B8";
string UIWidget = "None";
>;
texture DepthBuffer : RENDERDEPTHSTENCILTARGET
<
float2 ViewPortRatio = {1.0,1.0};
string Format = "D24S8";
string UIWidget = "None";
>;
float BloomThreshold = 0.9;
float BloomIntensity = 3.0;
float BaseIntensity = 1.0;
float BloomSaturation = 0.5;
float BaseSaturation = 1.0;
float g_bloomSpan <
string UIName = "Bloom Step Size (Texels)";
string UIWidget = "slider";
float UIMin = 0.2f;
float UIMax = 8.0f;
float UIStep = 0.5f;
> = 2.5f;
sampler g_sampBase =
sampler_state
{
Texture = <g_texBase>;
MipFilter = LINEAR;
MagFilter = LINEAR;
MipFilter = LINEAR;
};
sampler g_sampBloomH =
sampler_state
{
Texture = <g_texBloomH>;
AddressU = CLAMP;
AddressV = CLAMP;
MipFilter = POINT;
MinFilter = LINEAR;
MagFilter = LINEAR;
};
sampler g_sampBloomHV =
sampler_state
{
Texture = <g_texBloomHV>;
AddressU = CLAMP;
AddressV = CLAMP;
MipFilter = POINT;
MinFilter = LINEAR;
MagFilter = LINEAR;
};
void ScreenQuadVS( float3 Position : POSITION
, float2 UV : TEXCOORD0
, out float4 OUT_Position : POSITION
, out float2 OUT_UV : TEXCOORD0 )
{
OUT_Position = float4(Position, 1);
OUT_UV = UV;
}
// nine texcoords, to sample nine in-line texels
struct NineTexelVertex
{
float4 Position : POSITION;
float2 UV : TEXCOORD0;
float4 UV1 : TEXCOORD1; // xy AND zw used as UV coords
float4 UV2 : TEXCOORD2; // xy AND zw used as UV coords
float4 UV3 : TEXCOORD3; // xy AND zw used as UV coords
float4 UV4 : TEXCOORD4; // xy AND zw used as UV coords
};
// vertex shader to align blur samples vertically
NineTexelVertex vert9BlurVS(
float3 Position : POSITION,
float2 UV : TEXCOORD0
) {
NineTexelVertex OUT = (NineTexelVertex)0;
OUT.Position = float4(Position, 1);
float TexelIncrement = g_bloomSpan/ViewportSize.y;
float2 Coord = float2(UV.xy + ViewportOffset);
OUT.UV = Coord;
OUT.UV1 = float4(Coord.x, Coord.y + TexelIncrement,
Coord.x, Coord.y - TexelIncrement);
OUT.UV2 = float4(Coord.x, Coord.y + TexelIncrement*2,
Coord.x, Coord.y - TexelIncrement*2);
OUT.UV3 = float4(Coord.x, Coord.y + TexelIncrement*3,
Coord.x, Coord.y - TexelIncrement*3);
OUT.UV4 = float4(Coord.x, Coord.y + TexelIncrement*4,
Coord.x, Coord.y - TexelIncrement*4);
return OUT;
}
// vertex shader to align blur samples horizontally
NineTexelVertex horiz9BlurVS(
float3 Position : POSITION,
float2 UV : TEXCOORD0
) {
NineTexelVertex OUT = (NineTexelVertex)0;
OUT.Position = float4(Position, 1);
float TexelIncrement = g_bloomSpan/ViewportSize.x;
float2 Coord = float2(UV.xy + ViewportOffset);
OUT.UV = Coord;
OUT.UV1 = float4(Coord.x + TexelIncrement, Coord.y,
Coord.x - TexelIncrement, Coord.y);
OUT.UV2 = float4(Coord.x + TexelIncrement*2, Coord.y,
Coord.x - TexelIncrement*2, Coord.y);
OUT.UV3 = float4(Coord.x + TexelIncrement*3, Coord.y,
Coord.x - TexelIncrement*3, Coord.y);
OUT.UV4 = float4(Coord.x + TexelIncrement*4, Coord.y,
Coord.x - TexelIncrement*4, Coord.y);
return OUT;
}
float4 blur9PS(NineTexelVertex IN,
uniform sampler2D SrcSamp) : COLOR
{
float4 OutCol = tex2D(SrcSamp, IN.UV4.zw) * KW_4;
OutCol += tex2D(SrcSamp, IN.UV3.zw) * KW_2;
OutCol += tex2D(SrcSamp, IN.UV1.zw) * KW_1;
OutCol += tex2D(SrcSamp, IN.UV) * KW_0;
OutCol += tex2D(SrcSamp, IN.UV1.xy) * KW_1;
OutCol += tex2D(SrcSamp, IN.UV2.xy) * KW_2;
OutCol += tex2D(SrcSamp, IN.UV3.xy) * KW_3;
OutCol += tex2D(SrcSamp, IN.UV4.xy) * KW_4;
return OutCol;
}
// Helper for modifying the saturation of a color.
float4 AdjustSaturation(float4 color, float saturation)
{
// The constants 0.3, 0.59, and 0.11 are chosen because the
// human eye is more sensitive to green light, and less to blue.
float grey = dot(color, float3(0.3, 0.59, 0.11));
return lerp(grey, color, saturation);
}
float4 BloomExtract_PS(float2 texCoord : TEXCOORD0) : COLOR0
{
// ======== ORIG ============
// Look up the original image color.
// float4 c = tex2D(g_sampBase, texCoord);
// Adjust it to keep only values brighter than the specified threshold.
// return saturate((c - BloomThreshold) / (1 - BloomThreshold));
// ==========================
// DeepFar 05 24 :
// For now we are using Floating Point Texture
// there is no need to saturate the color
// we just need to ensure no negative number here
return float4( max( tex2D(g_sampBase, texCoord).xyz - BloomThreshold, 0), 1.0f );
}
float4 BloomCombine_PS(float2 texCoord : TEXCOORD0) : COLOR0
{
// ============== ORIG ======================
// Look up the bloom and original base image colors.
float4 bloom = tex2D(g_sampBloomHV, texCoord);
float4 base = tex2D(g_sampBase, texCoord);
// Adjust color saturation and intensity.
bloom = AdjustSaturation(bloom, BloomSaturation) * BloomIntensity;
base = AdjustSaturation(base, BaseSaturation) * BaseIntensity;
// Darken down the base image in areas where there is a lot of bloom,
// to prevent things looking excessively burned-out.
// base *= (1 - saturate(bloom));
// Combine the two images.
return base + bloom;
// ==========================================
}
technique BloomExtract
<
string Script =
"RenderColorTarget0=g_texBase;"
//"RenderDepthStencilTarget0=DepthBuffer;"
"ClearSetColor=ClearColor;"
"ClearSetDepth=ClearDepth;"
"Clear=Color;"
"Clear=Depth;"
"ScriptExternal=color;"
" ass=Extract;"
"Pass=BlurH;"
"Pass=BlurV;";
>
{
pass Extract
<
string Script =
"RenderColorTarget0=g_texBloomHV;"
"RenderDepthStencilTarget0=DepthBuffer;"
"ClearSetColor=ClearColor;"
"ClearSetDepth=ClearDepth;"
"Clear=Color;"
"Clear=Depth;"
"Draw=Buffer;";
>
{
VertexShader = compile vs_2_0 ScreenQuadVS();
cullmode = none;
ZEnable = false;
ZWriteEnable = false;
AlphaBlendEnable = false;
PixelShader = compile ps_2_0 BloomExtract_PS();
}
pass BlurH
<
string Script =
"RenderColorTarget0=g_texBloomH;"
"RenderDepthStencilTarget0=DepthBuffer;"
"Draw=Buffer;";
>
{
VertexShader = compile vs_2_0 horiz9BlurVS();
cullmode = none;
ZEnable = false;
ZWriteEnable = false;
AlphaBlendEnable = false;
PixelShader = compile ps_2_0 blur9PS(g_sampBloomHV);
}
pass BlurV
<
string Script =
"RenderColorTarget0=g_texBloomHV;"
"RenderDepthStencilTarget0=DepthBuffer;"
"Draw=Buffer;";
>
{
VertexShader = compile vs_2_0 vert9BlurVS();
cullmode = none;
ZEnable = false;
ZWriteEnable = false;
AlphaBlendEnable = false;
PixelShader = compile ps_2_0 blur9PS(g_sampBloomH);
}
}
technique BloomCombine
<
string Script =
"Pass=Pass0;";
>
{
pass Pass0
<
string Script =
"RenderColorTarget0=;"
"RenderDepthStencilTarget0=;"
"ClearSetColor=ClearColor;"
"ClearSetDepth=ClearDepth;"
"Clear=Color;"
"Clear=Depth;"
"Draw=Buffer;";
>
{
cullmode = none;
ZEnable = false;
ZWriteEnable = false;
AlphaBlendEnable = false;
VertexShader = compile vs_2_0 ScreenQuadVS();
PixelShader = compile ps_2_0 BloomCombine_PS();
}
}
这样的代码如果导入DirectX的effect能否实现shader的texture和RenderTarget自己管理了? |
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发表于 2009-3-11 22:24:00
