How can I implement vertex/fragment-shader with multiple passes???
here is my problem:
- i have a base-texture
- in the first pass I want to do some things if i find a special color on the basetexture - e.g. change color to another value
- in the second pass I want to do some other things if i find another color.
- in the third pass i want to calculate the correct lightning & reflecion
- and the result should be written to a texture
or does anybody know a better way??