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sampler s0 : register(s0);
float4 p0 : register(c0);
#define width (p0[0])
#define height (p0[1])
#define NbPixel 1
#define Edge_threshold 0.2
#define Sharpen_val0 2.0
#define Sharpen_val1 0.125
float4 main(float2 tex : TEXCOORD0) : COLOR
{
// taille de NbPixel pixels
float dx = NbPixel/width;
float dy = NbPixel/height;
float4 Res = 0;
// Détection de contour par Prewitt
// récuppération des 9 points
// [ 1, 2, 3 ]
// [ 4, 0, 5 ]
// [ 6, 7, 8 ]
float4 c0 = tex2D(s0, tex);
float4 c1 = tex2D(s0, tex + float2(-dx,-dy));
float4 c2 = tex2D(s0, tex + float2(0,-dy));
float4 c3 = tex2D(s0, tex + float2(dx,-dy));
float4 c4 = tex2D(s0, tex + float2(-dx,0));
float4 c5 = tex2D(s0, tex + float2(dx,0));
float4 c6 = tex2D(s0, tex + float2(-dx,dy));
float4 c7 = tex2D(s0, tex + float2(0,dy));
float4 c8 = tex2D(s0, tex + float2(dx,dy));
// Calcul des 3 vecteurs dérivé (hor,vert, diag1, diag2)
float4 delta1 = (c6+c4+c1-c3-c5-c8);
float4 delta2 = (c4+c1+c2-c5-c8-c7);
float4 delta3 = (c1+c2+c3-c8-c7-c6);
float4 delta4 = (c2+c3+c5-c7-c6-c4);
// calcul du Prewitt
float value = length(abs(delta1) + abs(delta2) + abs(delta3) + abs(delta4))/6;
// Si c'est un contour (vector lenght > Edge_threshold) => filtre de sharpen
if(value > Edge_threshold )
{
Res = c0 * Sharpen_val0 - (c1 + c2 + c3 + c4 + c5 + c6 + c7 + c8 ) * Sharpen_val1 ;
// Pour voir les contour en rouge ...
//Res = float4( 1.0, 0.0, 0.0, 0.0 );
return Res;
}
else
return c0;
}
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