| '''OpenGL extension AMD.shader_stencil_export |
| |
| This module customises the behaviour of the |
| OpenGL.raw.GL.AMD.shader_stencil_export to provide a more |
| Python-friendly API |
| |
| Overview (from the spec) |
| |
| In OpenGL, the stencil test is a powerful mechanism to selectively discard |
| fragments based on the content of the stencil buffer. However, facilites |
| to update the content of the stencil buffer are limited to operations such |
| as incrementing the existing value, or overwriting with a fixed reference |
| value. |
| |
| This extension provides a mechanism whereby a shader may generate the |
| stencil reference value per invocation. When stencil testing is enabled, |
| this allows the test to be performed against the value generated in the |
| shader. When the stencil operation is set to GL_REPLACE, this allows a |
| value generated in the shader to be written to the stencil buffer directly. |
| |
| The official definition of this extension is available here: |
| http://www.opengl.org/registry/specs/AMD/shader_stencil_export.txt |
| ''' |
| from OpenGL import platform, constant, arrays |
| from OpenGL import extensions, wrapper |
| import ctypes |
| from OpenGL.raw.GL import _types, _glgets |
| from OpenGL.raw.GL.AMD.shader_stencil_export import * |
| from OpenGL.raw.GL.AMD.shader_stencil_export import _EXTENSION_NAME |
|
|
| def glInitShaderStencilExportAMD(): |
| '''Return boolean indicating whether this extension is available''' |
| from OpenGL import extensions |
| return extensions.hasGLExtension( _EXTENSION_NAME ) |
|
|
|
|
| |
