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// Cyrille Henry 2007
#extension GL_ARB_texture_rectangle : enable
uniform float K1,K3,D1,K;
uniform sampler2DRect text;
const float dx = 1.;
const float dy = 1.;
void main (void)
{
float x,y;
vec4 C;
vec2 texture1 = gl_TexCoord[0].st ;
x=texture1.x;
y=texture1.y;
C = texture2DRect(text, vec2(x, y));
vec4 color_cote = texture2DRect(text, vec2(x-dx, y-dy));
color_cote += texture2DRect(text, vec2(x+dx, y-dy));
color_cote += texture2DRect(text, vec2(x-dx, y+dy));
color_cote += texture2DRect(text, vec2(x+dx, y+dy));
color_cote += texture2DRect(text, vec2(x, y-dy));
color_cote += texture2DRect(text, vec2(x-dx, y));
color_cote += texture2DRect(text, vec2(x+dx, y));
color_cote += texture2DRect(text, vec2(x, y+dy));
float K = K1 * color_cote.r + K3 * 0.5 - (8. * K1 + K3) * C.r;
float D = D1 * (C.r - C.g);
C.b = C.g;
C.g = C.r;
C.r = (2.* C.g) - C.b + K - D ;
gl_FragColor = vec4(C.rgb,1.);
}
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