OpenGL (libgdx) - blending alpha map -


i trying blend white texture varying alpha values colored background. expecting result retain colors background, , have alpha values replaced ones blended texture.

so, background use:

gdx.gl.glenable(gl20.gl_blend); gdx.gl.glblendequationseparate(gl20.gl_func_add, gl20.gl_func_add); gdx.gl.glblendfuncseparate(gl20.gl_one, gl20.gl_zero, gl20.gl_one, gl20.gl_zero);

i expect background triangles mesh override destination, both color , alpha.

question 1 - why blendfunc parameters, alpha value being ignored? if set blendfunc gl_one, gl_one, gl_zero, gl_zero filled mesh rendered proper alpha level - both source , dest alpha supposed multiplied 0 - why work?

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now blend alpha map use:

gdx.gl.glblendequationseparate(gl20.gl_func_add, gl20.gl_func_add); gdx.gl.glblendfuncseparate(gl20.gl_zero, gl20.gl_one, gl20.gl_one, gl20.gl_zero);

question 2 - supposed keep destination color , replace alpha. however, when render texture blendfunc params, no change output @ all...

i've been reading opengl blending chapter on , on again understand fail understand, please, share insight on how parameters work

i use this:

gdx.gl.glenable(gl20.gl_blend); gdx.gl.glblendfunc(gl20.gl_src_alpha, gl20.gl_one_minus_src_alpha);

it works in order of rendering. in order account depth need alpha testing libgdx not include.


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