获得了OpenGL-ES模板缓冲区工作 [英] Getting the OpenGL-ES Stencil Buffer Working

问题描述

通过在OpenGL-ES模板缓存为Android，我只是想屏蔽掉绘制屏幕的一部分。我想我有它树立正确的，但它不是掩盖了非钢印的部分。下面是我在做什么的提取code。

With the stencil buffer in opengl-es for Android, I'm simply trying to mask out drawing part of the screen. I think I have it set up right, but it is not masking out the non-stenciled parts. Below is an extraction of code for what I'm doing.

gl.glEnable(GL10.GL_STENCIL_TEST);
gl.glClearStencil(0);
gl.glClear(GL10.GL_STENCIL_BUFFER_BIT);
gl.glColorMask(false, false, false, false);
gl.glDepthMask(false);
gl.glStencilFunc(GL10.GL_ALWAYS, 1, 1);
gl.glStencilOp(GL10.GL_REPLACE, GL10.GL_REPLACE, GL10.GL_REPLACE);

drawMask(); //I have confirmed this draws to the correct location by allowing colour to show. Trust that this draws the mask to the correct location.

gl.glColorMask(true, true, true, true);
gl.glDepthMask(true);
gl.glStencilFunc(GL10.GL_EQUAL, 1, 1);
gl.glStencilOp(GL10.GL_KEEP, GL10.GL_KEEP, GL10.GL_KEEP);

drawItems(); //Draw everything. Only items inside the masked area should be drawn. But everything is drawn with this code...

gl.glDisable(GL10.GL_STENCIL_TEST);

任何人都点什么不好呢？它的作用主要是画一个框，说，半个屏幕（这个工作，如果我已使颜色），这是模板缓存设置为1的区域。并在结束时，我画到整个屏幕。我希望它画到只有上半部分，但它吸引了一切。

Anyone spot anything wrong with this? What it does basically is draw a box for say, half the screen (this works if I had colour enabled) which is setting the stencil buffer to 1 for that area. And at the end I draw to the whole screen. I want it to draw to the top half only, but it draws everything.

在此先感谢。

推荐答案

原因结束了，我没有把我的EGLConfig正确支持模板缓存。

The reason ended up being that I had not set my EGLConfig properly to support stencil buffer.

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