Hi all!
I am trying to implement a lighting-shadow engine in my litte 2d java game.
I followed this tutorial.
http://www.gamedev.n...t-shadows-r2032
In contrary to the tutorial, I am using textures for my entites.
All my Z-values (Lights,Background and Entities) are 0.

[source lang="java"]function render():
clearZBuffer()
fillZBuffer()
foreach(light in lights)
clearAlpha()
glEnable(GL.GL_DEPTH_TEST);
glDisable(GL.GL_BLEND);
glColorMask(false, false, false, true);
renderLightAlpha(light);
glEnable(GL.GL_BLEND);
glBlendFunc(GL.GL_ZERO, GL.GL_ONE_MINUS_SRC_ALPHA);
renderShadows(light);
glDisable(GL.GL_DEPTH_TEST);
glEnable(GL.GL_DEPTH_TEST);
glColorMask(true, true, true, false);
renderBackgroundTexture();
if (light.DrawSource()) {
renderLightSource(light);
}
renderEntities();
glDisable(GL.GL_DEPTH_TEST);
glDisable(GL.GL_BLEND);


function clearZBuffer()
glClearDepth(1);
glClearColor(0, 0, 0, 0);
glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT|GL.GL_STENCIL_BUFFER_BIT);

function fillZBuffer()
glEnable(GL.GL_DEPTH_TEST);
glDepthMask(true);
glColorMask(false, false, false, false);
renderBackgroundTexture();
renderEntities();
glDepthMask(false);
glDisable(GL.GL_DEPTH_TEST);
function clearAlpha()
glColorMask(false, false, false, true);
glClear(GL.GL_COLOR_BUFFER_BIT);
[/source]
here is a picture of my output:

My Problem is, that the entity textures are not rendered correctly. It seems like black parts are not at all.
It works when I enable colorwriting in the fillZBuffer function:


Does anyone know how I can get the textures fully drawn without enabling colorwriting while filling the zBuffer?

It is working now. I forgot to enable writing to the depth buffer while clean it. And I had to enable GL_ALPHA_TEST to get the transparency of the textures while filling the depth buffer.


gl.glEnable ( GL2.GL_ALPHA_TEST ) ;
gl.glAlphaFunc ( GL.GL_GREATER, 0.1f) ;