| '''OpenGL extension NV.shader_buffer_store |
| |
| This module customises the behaviour of the |
| OpenGL.raw.GL.NV.shader_buffer_store to provide a more |
| Python-friendly API |
| |
| Overview (from the spec) |
| |
| This extension builds upon the mechanisms added by the |
| NV_shader_buffer_load extension to allow shaders to perform random-access |
| reads to buffer object memory without using dedicated buffer object |
| binding points. Instead, it allowed an application to make a buffer |
| object resident, query a GPU address (pointer) for the buffer object, and |
| then use that address as a pointer in shader code. This approach allows |
| shaders to access a large number of buffer objects without needing to |
| repeatedly bind buffers to a limited number of fixed-functionality binding |
| points. |
| |
| This extension lifts the restriction from NV_shader_buffer_load that |
| disallows writes. In particular, the MakeBufferResidentNV function now |
| allows READ_WRITE and WRITE_ONLY access modes, and the shading language is |
| extended to allow shaders to write through (GPU address) pointers. |
| Additionally, the extension provides built-in functions to perform atomic |
| memory transactions to buffer object memory. |
| |
| As with the shader writes provided by the EXT_shader_image_load_store |
| extension, writes to buffer object memory using this extension are weakly |
| ordered to allow for parallel or distributed shader execution. The |
| EXT_shader_image_load_store extension provides mechanisms allowing for |
| finer control of memory transaction order, and those mechanisms apply |
| equally to buffer object stores using this extension. |
| |
| |
| The official definition of this extension is available here: |
| http://www.opengl.org/registry/specs/NV/shader_buffer_store.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.NV.shader_buffer_store import * |
| from OpenGL.raw.GL.NV.shader_buffer_store import _EXTENSION_NAME |
|
|
| def glInitShaderBufferStoreNV(): |
| '''Return boolean indicating whether this extension is available''' |
| from OpenGL import extensions |
| return extensions.hasGLExtension( _EXTENSION_NAME ) |
|
|
|
|
| |
