| | '''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 ) |
| |
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| |
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| | |
