OpenGL.GL.NV.vertex_program4

OpenGL extension NV.vertex_program4

This module customises the behaviour of the OpenGL.raw.GL.NV.vertex_program4 to provide a more Python-friendly API

Overview (from the spec)

This extension builds on the common assembly instruction set infrastructure provided by NV_gpu_program4, adding vertex program-specific features.

This extension provides the ability to specify integer vertex attributes that are passed to vertex programs using integer data types, rather than being converted to floating-point values as in existing vertex attribute functions. The set of input and output bindings provided includes all bindings supported by ARB_vertex_program. This extension provides additional input bindings identifying the index of the vertex when vertex arrays are used ("vertex.id") and the instance number when instanced arrays are used ("vertex.instance", requires EXT_draw_instanced). It also provides output bindings allowing vertex programs to directly specify clip distances (for user clipping) plus a set of generic attributes that allow programs to pass a greater number of attributes to subsequent pipeline stages than is possible using only the pre-defined fixed-function vertex outputs.

By and large, programs written to ARB_vertex_program can be ported directly by simply changing the program header from "!!ARBvp1.0" to "!!NVvp4.0", and then modifying instructions to take advantage of the expanded feature set. There are a small number of areas where this extension is not a functional superset of previous vertex program extensions, which are documented in the NV_gpu_program4 specification.

The official definition of this extension is available here: http://www.opengl.org/registry/specs/NV/vertex_program4.txt