| | '''OpenGL extension AMD.vertex_shader_layer |
| | |
| | This module customises the behaviour of the |
| | OpenGL.raw.GL.AMD.vertex_shader_layer to provide a more |
| | Python-friendly API |
| | |
| | Overview (from the spec) |
| | |
| | The gl_Layer built-in shading language variable was introduced with the |
| | ARB_geometry_shader extension and subsequently promoted to core OpenGL |
| | in version 3.2. This variable is an output from the geometry shader stage |
| | that allows rendering to be directed to a specific layer of an array |
| | texture, slice of a 3D texture or face of a cube map or cube map array |
| | attachment of the framebuffer. Thus, this extremely useful functionality is |
| | only available if a geometry shader is present - even if the geometry shader |
| | is not otherwise required by the application. This adds overhead to the |
| | graphics processing pipeline, and complexity to applications. It also |
| | precludes implementations that cannot support geometry shaders from |
| | supporting rendering to layered framebuffer attachments. |
| | |
| | This extension exposes the gl_Layer built-in variable in the vertex shader, |
| | allowing rendering to be directed to layered framebuffer attachments with |
| | only a vertex and fragment shader present. Combined with features such |
| | as instancing, or static vertex attributes and so on, this allows a wide |
| | variety of techniques to be implemented without the requirement for a |
| | geometry shader to be present. |
| | |
| | The official definition of this extension is available here: |
| | http://www.opengl.org/registry/specs/AMD/vertex_shader_layer.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.vertex_shader_layer import * |
| | from OpenGL.raw.GL.AMD.vertex_shader_layer import _EXTENSION_NAME |
| |
|
| | def glInitVertexShaderLayerAMD(): |
| | '''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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| | |
