/usr/share/kde4/apps/kwin/explosion.frag is in kde-window-manager-common 4:4.8.2a-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | uniform sampler2D sampler;
uniform sampler2D startOffsetTexture;
uniform sampler2D endOffsetTexture;
uniform float factor;
uniform float scale;
uniform vec2 windowSize;
const float regionTexSize = 512.0;
varying vec2 varyingTexCoords;
vec2 getOffset(sampler2D texture, vec2 pos)
{
return (texture2D(texture, pos / regionTexSize).xy - 0.5) / (5.0 / 256.0);
}
vec2 pix2tex( vec2 pix )
{
return pix/windowSize;
}
void main()
{
// Original (unscaled) position in pixels
// ### FIXME: Use a custom vertex shader that outputs the untransformed texcoords
vec2 origpos = varyingTexCoords * windowSize;
// Position in pixels on the scaled window
vec2 pos = origpos * scale;
// Start/end position of current region
vec2 rstart = origpos + getOffset(startOffsetTexture, origpos);
vec2 rend = origpos + getOffset(endOffsetTexture, origpos);
float alpha = texture2D(startOffsetTexture, origpos / regionTexSize).b;
// Distance from the start of the region
vec2 dist = pos - rstart*scale;
#if 0
// crashes kwin on nouveau
if(any(greaterThan(dist, rend-rstart)))
discard;//alpha = 0.0;
#endif
vec2 transformedtexcoord = pix2tex(rstart + dist);
vec3 tex = texture2D(sampler, transformedtexcoord).rgb;
#if 0
// ATM we ignore custom opacity values because Fade effect fades out the
// window which results in the explosion being way too quick. Once there's
// a way to suppress Fade effect when ExplosionEffect is active, we can
// use the custom opacity again
gl_FragColor = vec4(tex, (1.0 - factor*factor) * alpha * opacity);
#else
gl_FragColor = vec4(tex, (1.0 - factor*factor) * alpha);
#endif
}
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