OpenGL.GL.APPLE.vertex_program_evaluators

OpenGL extension APPLE.vertex_program_evaluators

This module customises the behaviour of the OpenGL.raw.GL.APPLE.vertex_program_evaluators to provide a more Python-friendly API

Overview (from the spec)

This extension allows the one- and two-dimensional evaluators to be used with vertex program attributes. The operation of this extension is precisely analogous to the operation of the normal evaluators.

Where normal evaluators are enabled with Enable(MAP1_VERTEX_3), for example, attribute evaluators are enabled with EnableVertexAttribAPPLE(index, VERTEX_ATTRIB_MAP1_APPLE).

Where the size (1, 2, 3, or 4) of a normal evaluator is embedded in the token for that evaluator (for example, MAP1_VERTEX_3 has size 3), attribute evaluators give the size as an argument to MapVertexAttrib**APPLE.

The 1D and 2D evaluator order, domain, and coefficients are given as arguments to MapVertexAttrib**APPLE, with exactly the same meaning and restrictions as the same arguments to Map1f, Map2f, Map1d, & Map2d. The evaluator order, domain, and coefficients may be queried with GetVertexAttrib*vARB, with the same operation as GetMap*v.

The official definition of this extension is available here: http://www.opengl.org/registry/specs/APPLE/vertex_program_evaluators.txt