| | '''OpenGL extension ARB.instanced_arrays |
| | |
| | This module customises the behaviour of the |
| | OpenGL.raw.GL.ARB.instanced_arrays to provide a more |
| | Python-friendly API |
| | |
| | Overview (from the spec) |
| | |
| | A common use case in GL for some applications is to be able to |
| | draw the same object, or groups of similar objects that share |
| | vertex data, primitive count and type, multiple times. This |
| | extension provides a means of accelerating such use cases while |
| | restricting the number of API calls, and keeping the amount of |
| | duplicate data to a minimum. |
| | |
| | In particular, this extension specifies an alternative to the |
| | read-only shader variable introduced by ARB_draw_instanced. It |
| | uses the same draw calls introduced by that extension, but |
| | redefines them so that a vertex shader can instead use vertex |
| | array attributes as a source of instance data. |
| | |
| | This extension introduces an array "divisor" for generic |
| | vertex array attributes, which when non-zero specifies that the |
| | attribute is "instanced." An instanced attribute does not |
| | advance per-vertex as usual, but rather after every <divisor> |
| | conceptual draw calls. |
| | |
| | (Attributes which aren't instanced are repeated in their entirety |
| | for every conceptual draw call.) |
| | |
| | By specifying transform data in an instanced attribute or series |
| | of instanced attributes, vertex shaders can, in concert with the |
| | instancing draw calls, draw multiple instances of an object with |
| | one draw call. |
| | |
| | The official definition of this extension is available here: |
| | http://www.opengl.org/registry/specs/ARB/instanced_arrays.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.ARB.instanced_arrays import * |
| | from OpenGL.raw.GL.ARB.instanced_arrays import _EXTENSION_NAME |
| |
|
| | def glInitInstancedArraysARB(): |
| | '''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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| | |
