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.
Then 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[0].st; void main() { 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 .
Pierre-Yves