5899a26aad
git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@14590 178a84e3-b1eb-0310-8ba1-8eac791a3b58
55 lines
912 B
GLSL
55 lines
912 B
GLSL
uniform sampler2D tex;
|
|
uniform int size;
|
|
uniform vec2 pixel;
|
|
|
|
vec4 encdepth(float v) {
|
|
vec4 enc = vec4(1.0, 255.0, 65025.0, 16581375.0) * v;
|
|
enc = fract(enc);
|
|
enc -= enc.yzww * vec4(1.0/255.0, 1.0/255.0, 1.0/255.0, 0.0);
|
|
return enc;
|
|
}
|
|
|
|
void main()
|
|
{
|
|
vec2 origtc = gl_TexCoord[0].xy;
|
|
|
|
// Get total sum
|
|
float first = 1.0, last = 0.0;
|
|
float lower = 0.0;
|
|
float total = 0.0;
|
|
vec2 tc = pixel * 0.5;
|
|
|
|
for (int i = 0; i < size; i++)
|
|
{
|
|
float col = texture2D(tex, tc).x;
|
|
|
|
lower += col * step(tc.y, origtc.y);
|
|
total += col;
|
|
|
|
if (col > 0.0001)
|
|
{
|
|
first = min(first, tc.y);
|
|
last = max(last, tc.y);
|
|
}
|
|
|
|
tc += pixel;
|
|
}
|
|
|
|
float res = (lower / total) - origtc.y;
|
|
|
|
// Outside the edges?
|
|
if (origtc.y <= first)
|
|
{
|
|
res = origtc.y * -2.1;
|
|
}
|
|
else if (origtc.y >= last)
|
|
{
|
|
res = (1.0 - origtc.y) * 2.1;
|
|
}
|
|
|
|
res = res * 0.5 + 0.5;
|
|
res = clamp(res, 0.01, 0.99);
|
|
|
|
gl_FragColor = encdepth(res);
|
|
}
|