Stencil Test: Difference between revisions
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== Stencil buffer == | |||
In order to use the stencil test, the current [[Framebuffer]] must have a stencil buffer. The stencil buffer is an image that uses a stencil image format. The [[Default Framebuffer]] may have a stencil buffer, and [[Framebuffer Object|user-defined framebuffers]] can attach stencil formatted images (either [[Image_Format#Depth_stencil_formats|depth/stencil]] or [[Image_Format#Stencil_only|stencil-only]]) to the GL_STENCIL_ATTACHMENT attachment point. | |||
[[Category:Sample Writing]] | [[Category:Sample Writing]] | ||
Revision as of 17:05, 12 January 2015
OpenGL Rendering Pipeline
The Stencil Test is a per-sample operation performed after the Fragment Shader. The fragment's stencil value is tested against the value in the current stencil buffer; if the test fails, the fragment is culled.
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Stencil buffer
In order to use the stencil test, the current Framebuffer must have a stencil buffer. The stencil buffer is an image that uses a stencil image format. The Default Framebuffer may have a stencil buffer, and user-defined framebuffers can attach stencil formatted images (either depth/stencil or stencil-only) to the GL_STENCIL_ATTACHMENT attachment point.