globalCompositeOperation about canvas2dtowebgl HOT 5 CLOSED

no, I haven't figure out the equivalent of the globalcompositeoperation modes with the blend modes of opengl

from canvas2dtowebgl.

What about creating custom shaders for it?

from canvas2dtowebgl.

thats not how global composite operation works, as it doesnt involve shaders but blending operations

from canvas2dtowebgl.

thats not how global composite operation works, as it doesnt involve shaders but blending operations

I'm not an expert at glsl programming, but i've always used shaders to do color math, i'm sure you can emulate almost all composite operations

from canvas2dtowebgl.

shaders are not allowed to read the destination pixel. it can be overpass by rendering all to a texture, but that makes it way slower.
there is a extension proposed to solve this but it is not supported yet by browsers.

from canvas2dtowebgl.