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PONested Stencil - OpenGL ES
 

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  1. PONested Stencil - OpenGL ES
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    <p>I have a 2D node scene graph that I'm trying to 'nest' stencil clipping in.</p> <p>I was thinking what I could do is when drawing the stencil, increment any pixel it writes to by 1, and keep track of what the current 'layer' is that I'm on.</p> <p>Then when drawing, only write pixel data to the color buffer if the value of the stencil at that pixel is >= the current layer #.</p> <p>This is the code I have now. It doesn't quite work. Where am I messing up?</p> <p>First I call SetupStencilForMask(). Then draw stencil primitives. Next, call SetupStencilForDraw(). Now draw actual imagery When done with a layer, call DisableStencil().</p> <p>Edit: Updated with solution. It doesn't work for individual items on the same layer, but otherwise is fine. Found a great article on how to actually pull this off, although it's fairly limited. <a href="http://cranialburnout.blogspot.com/2014/03/nesting-and-overlapping-translucent.html" rel="nofollow">http://cranialburnout.blogspot.com/2014/03/nesting-and-overlapping-translucent.html</a></p> <pre><code>// glClear(GL_STENICL_BIT) at start of each draw frame static int stencilLayer = 0; void SetupStencilForMask(void) { if (stencilLayer == 0) glEnable(GL_STENCIL_TEST); glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); glStencilFunc(GL_LESS, stencilLayer, 0xff); glStencilOp(GL_INCR, GL_KEEP, GL_KEEP); glStencilMask(0xff); if (stencilLayer == 0) glClear(GL_STENCIL_BUFFER_BIT); stencilLayer++; } void SetupStencilForDraw() { glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE); glStencilFunc(GL_EQUAL, stencilLayer, 0xff); glStencilMask(0x00); } void DisableStencil(void) { if (--stencilLayer == 0) glDisable(GL_STENCIL_TEST); } </code></pre>
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