[PD] need help with gem and glsl feedback
pyfave at gmail.com
Wed Oct 2 20:10:45 CEST 2013
Hello list ,
i'm currently trying to understand a bit more glsl ,
and am tearing my hairs
i have a scene with some moving geometry (torus)
on this geometry i use successfully a simple shader to plot a moving circle.
i try to make the classical feedback effect , but i need to use glsl
because i want to control precisely the adding of the image at time
and at time+1
here is the feedback shader i try to use .
uniform sampler2D tex1,tex2;
uniform float motionblurstrenght;
vec2 coord = gl_TexCoord.st;
vec4 t1 = texture(tex1, coord);//new frame
vec4 t2 = texture(tex2, coord);//acumulated frame
gl_FragColor = vec4(t1.r);
float r = ((1.-motionblurstrenght)*t2.r) + (t1.r);//motion blur
gl_FragColor = vec4(r);
do you have a clean example or hints on how to implement this ?
i am currently fighting with gemframebuffer and pix_texture
and rendering order and texunits .
and i feel i'm missing something ..
i would like , if possible to keep this as an effect i can turn on and
off , without modifing my current gem chains .
i think i need two gem chains ,one early and one at last in the frame
drawing chronology , but i can't make it though i tried a lot
any help appreciated .
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