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How is a stencil buffer different from a color buffer?
A stencil buffer is an extra data buffer, in addition to the color buffer and depth buffer, found on modern graphics hardware. The buffer is per pixel, and works on integer values, usually with a depth of one byte per pixel. The depth buffer and stencil buffer often share the same area in the RAM of the graphics hardware.
How do you fill a stencil buffer in Photoshop?
One can fill the stencil buffer with a selected pattern by doing a stencil render pass, then set the appropriate stencil function which will define how the pattern is to be interpreted on subsequent drawings, then render the final scene. Pixels that fall into the rejected areas of the stencil mask, according to the compare function, are not drawn.
How is the stencil buffer used in the rendering pipeline?
More advanced usage of the stencil buffer makes use of the strong connection between the Z-buffer and the stencil buffer in the rendering pipeline. For example, stencil values can be automatically increased/decreased for every pixel that fails or passes the depth test.
How is a stencil test carried out in Photoshop?
Stencil test. The test itself is carried out over the stencil buffer to some value in it, or altered or used it, and carried out through the so-called stencil function and stencil operations. Stencil function is a function by which the stencil value of a certain pixel is compared to a given reference value.
How does a shader read a depth stencil buffer?
An inactive depth-stencil buffer can be read by a shader as a texture. An application that reads a depth-stencil buffer as a texture renders in two passes, the first pass writes to the depth-stencil buffer and the second pass reads from the buffer.
How does the stencil buffer work in OpenGL?
The stencil buffer is an optional extension of the depth buffer that gives you more control over the question of which fragments should be drawn and which shouldn’t. Like the depth buffer, a value is stored for every pixel, but this time you get to control when and how this value changes and when a fragment should be drawn depending on this value.
What is the purpose of a stencil test?
The stencil test is simply a per-pixel operation in which the current pixel stencil value is tested against the content of the stencil buffer. You set the condition to which the stencil test is passed ( e.g. ALWAYS, LESS etc. ).