OpenGL：只获取模板缓冲区和深度缓冲区？ [英] OpenGL: Acquiring only a stencil buffer and no depth buffer?

问题描述

我想获得一个模板缓冲区，但是如果可能的话，不会承受附加深度缓冲区的开销，因为我不会使用它。我发现大多数资源建议，虽然模板缓冲区是可选的（不包括它有利于获得更深的缓冲区精度，例如）我没有看到任何请求并成功获得只有8位模板缓冲区的代码。我看到的最常见的配置是24位深度缓冲区和8位模板缓冲区。

是否可以只使用一个彩色缓冲区的模板缓冲区？

如果可能，大多数OpenGL实现是否会授予此请求？

版本我使用的是2.0

m使用调用OpenGL是SFML，它通常不支持它的FBO包装器对象的模板分配，虽然它允许它的显示表面的帧缓冲区。我在自己编辑功能，虽然那是我被困住的地方。

  glRenderbufferStorageEXT（GL_RENDERBUFFER_EXT，GL_DEPTH24_STENCIL8_EXT，width，height））; 
  

此行决定了我假设的存储类型。但是， GL_DEPTH24_STENCIL8_EXT 是我发现的唯一一个定义了模板缓冲区创建的定义。 （至少没有GL_STENCIL8或类似的东西）

解决方案

研究 GL_STENCIL_INDEX8 在评论中提到，我在官方OpenGL wiki中遇到了以下行， http：/ /www.opengl.org/wiki/Framebuffer_Object_Examples#Stencil

永远不会造成STENCIL缓冲区。所有GPU和所有驱动程序不支持独立的模板缓冲区。如果你需要一个模板缓冲区，你需要做一个Depth = 24，Stencil = 8缓冲区，也叫D24S8。

测试两种不同的分配方案， GL_STENCIL_INDEX8_EXT vs GL_DEPTH24_STENCIL8_EXT ，结果大致相等，无论是在内存使用和性能。我怀疑它填充模板缓冲区与24位无论如何。因此，为了便于移植，只需使用深度和模板打包方案。

I would like to acquire a stencil buffer, but not suffer the overhead of an attached depth buffer if it's possible, since I wouldn't be using it. Most of the resources I've found suggest that while the stencil buffer is optional (excluding it in favour of gaining more depth buffer precision, for example) I have not seen any code that requests and successfully gets only the 8-bit stencil buffer. The most common configuration I've seen being 24 bit depth buffers with an 8 bit stencil buffer.

Is it possible to request only a stencil buffer with a color buffer?

If it is possible, Is it likely the request would be granted by most OpenGL implementations?

The OpenGL version I'm using is 2.0

edit:

The API I'm using to call OpenGL is SFML, which normally doesn't support stencil allocation for it's FBO wrapper objects, though it allows it for the display surface's framebuffer. I edited the functionality in myself, though that's where I'm stuck.

glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH24_STENCIL8_EXT, width, height));

This line decides the storage type I assume. However, GL_DEPTH24_STENCIL8_EXT is the only define I've found that specifies a stencil buffer's creation. (there's no GL_STENCIL8 or anything similar at least)

解决方案

Researching GL_STENCIL_INDEX8 that was mentioned in the comments, I came across the following line in the the official OpenGL wiki, http://www.opengl.org/wiki/Framebuffer_Object_Examples#Stencil

NEVER EVER MAKE A STENCIL buffer. All GPUs and all drivers do not support an independent stencil buffer. If you need a stencil buffer, then you need to make a Depth=24, Stencil=8 buffer, also called D24S8.

Stress testing the two different allocation schemes, GL_STENCIL_INDEX8_EXT vs GL_DEPTH24_STENCIL8_EXT, the results were roughly equal, both in terms of memory usage and performance. I suspect that it padded the stencil buffer with 24bits anyway. So for sake of portability, going to just use the depth and stencil packed scheme.

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