So the questions is : When I am using webgl to render stuff to a FBO, let's say a quad with 512 * 512, if I set the color to be (1, 0, 0, 0.5), which means its alpha is 0.5
Then I use the color attachement as a texture for a sprite, then render it to screen, i found that the alpha does not work.
I searched the question about premultiAlpha, but since my texture is not a image, i don't think it will work.
Even if i use gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, true);
Still not work.
Any help? Thanks a lot