Hi there OSGers!
Here we are againg with my simple depth-of-field effect.. :P I grab the
color buffer in a texture, i grab the depth buffer in another
texture and then I simply use this fragment shader with a polygonforeground
to do the job:
uniform sampler2D image;
uniform sampler2D depth;
uniform float threshold;
uniform float maxAmount;
uniform float depthBlur;
void main(void) {
vec4 dd = texture2D(depth, gl_TexCoord[0].xy);
float x = (dd.r-threshold)/(1.0-threshold)*maxAmount;
gl_FragColor = texture2D(image, gl_TexCoord[0].xy, x);
}
* image and depth are obviously the color and the depth buffer
textures.
* threshold is just the starting z value from which i want DOF to be
applied
* maxAmount is the maximum mipmap i'll use with the deepest z value
Everything works as it should, except for the x variable. It shoud be
between 0 an maxAmount, which it is, and its changes should be smooth,
as z values in the depth buffer smoothly change from point to point.
Unfortunately what i'm getting is something very similar to a floor
function, instead ( http://steffoz.altervista.org/1.png )
The unexplicable thing is that the problem must be exactly in that
line.. if I render the depth buffer with gl_FragColor = dd what I get
is a smooth rendering ( http://steffoz.altervista.org/2.png ).. what is
wrong?!
I really can't find the reason for this behaviour.. any suggestions? I
could attach some other screenshots to better describe the situation,
if useful.
Thank you very much,
Stefano Verna
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