gl_FrontFacing example

片段着色器另一个有意思的输入变量是 gl_FrontFacing 变量。在面剔除教程中，我们提到过OpenGL可以根据顶点绘制顺序弄清楚一个面是正面还是背面。

by Patricio Gonzalez Vivo. Gl_FrontFacing. Declaration / Example. Parameters. Description. See Al...

WebGL/sdk/tests/conformance/glsl/variables/gl-frontfacing.html ... <canvas id="example" width="32...

... we have seen how a fragment shader can use the built-in variable gl_FrontFacing to determine ...