| '''OpenGL extension ARB.fragment_program |
| |
| This module customises the behaviour of the |
| OpenGL.raw.GL.ARB.fragment_program to provide a more |
| Python-friendly API |
| |
| Overview (from the spec) |
| |
| Unextended OpenGL mandates a certain set of configurable per- |
| fragment computations defining texture application, texture |
| environment, color sum, and fog operations. Several extensions have |
| added further per-fragment computations to OpenGL. For example, |
| extensions have defined new texture environment capabilities |
| (ARB_texture_env_add, ARB_texture_env_combine, ARB_texture_env_dot3, |
| ARB_texture_env_crossbar), per-fragment depth comparisons |
| (ARB_depth_texture, ARB_shadow, ARB_shadow_ambient, |
| EXT_shadow_funcs), per-fragment lighting (EXT_fragment_lighting, |
| EXT_light_texture), and environment mapped bump mapping |
| (ATI_envmap_bumpmap). |
| |
| Each such extension adds a small set of relatively inflexible per- |
| fragment computations. |
| |
| This inflexibility is in contrast to the typical flexibility |
| provided by the underlying programmable floating point engines |
| (whether micro-coded fragment engines, DSPs, or CPUs) that are |
| traditionally used to implement OpenGL's texturing computations. |
| The purpose of this extension is to expose to the OpenGL application |
| writer a significant degree of per-fragment programmability for |
| computing fragment parameters. |
| |
| For the purposes of discussing this extension, a fragment program is |
| a sequence of floating-point 4-component vector operations that |
| determines how a set of program parameters (not specific to an |
| individual fragment) and an input set of per-fragment parameters are |
| transformed to a set of per-fragment result parameters. |
| |
| The per-fragment computations for standard OpenGL given a particular |
| set of texture and fog application modes (along with any state for |
| extensions defining per-fragment computations) is, in essence, a |
| fragment program. However, the sequence of operations is defined |
| implicitly by the current OpenGL state settings rather than defined |
| explicitly as a sequence of instructions. |
| |
| This extension provides an explicit mechanism for defining fragment |
| program instruction sequences for application-defined fragment |
| programs. In order to define such fragment programs, this extension |
| defines a fragment programming model including a floating-point |
| 4-component vector instruction set and a relatively large set of |
| floating-point 4-component registers. |
| |
| The extension's fragment programming model is designed for efficient |
| hardware implementation and to support a wide variety of fragment |
| programs. By design, the entire set of existing fragment programs |
| defined by existing OpenGL per-fragment computation extensions can |
| be implemented using the extension's fragment programming model. |
| |
| The official definition of this extension is available here: |
| http://www.opengl.org/registry/specs/ARB/fragment_program.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.fragment_program import * |
| from OpenGL.raw.GL.ARB.fragment_program import _EXTENSION_NAME |
|
|
| def glInitFragmentProgramARB(): |
| '''Return boolean indicating whether this extension is available''' |
| from OpenGL import extensions |
| return extensions.hasGLExtension( _EXTENSION_NAME ) |
|
|
| |
| glProgramStringARB=wrapper.wrapper(glProgramStringARB).setInputArraySize( |
| 'string', None |
| ) |
| |
| glDeleteProgramsARB=wrapper.wrapper(glDeleteProgramsARB).setInputArraySize( |
| 'programs', None |
| ) |
| glGenProgramsARB=wrapper.wrapper(glGenProgramsARB).setOutput( |
| 'programs',size=lambda x:(x,),pnameArg='n',orPassIn=True |
| ) |
| glProgramEnvParameter4dvARB=wrapper.wrapper(glProgramEnvParameter4dvARB).setInputArraySize( |
| 'params', 4 |
| ) |
| glProgramEnvParameter4fvARB=wrapper.wrapper(glProgramEnvParameter4fvARB).setInputArraySize( |
| 'params', 4 |
| ) |
| glProgramLocalParameter4dvARB=wrapper.wrapper(glProgramLocalParameter4dvARB).setInputArraySize( |
| 'params', 4 |
| ) |
| glProgramLocalParameter4fvARB=wrapper.wrapper(glProgramLocalParameter4fvARB).setInputArraySize( |
| 'params', 4 |
| ) |
| glGetProgramEnvParameterdvARB=wrapper.wrapper(glGetProgramEnvParameterdvARB).setOutput( |
| 'params',size=(4,),orPassIn=True |
| ) |
| glGetProgramEnvParameterfvARB=wrapper.wrapper(glGetProgramEnvParameterfvARB).setOutput( |
| 'params',size=(4,),orPassIn=True |
| ) |
| glGetProgramLocalParameterdvARB=wrapper.wrapper(glGetProgramLocalParameterdvARB).setOutput( |
| 'params',size=(4,),orPassIn=True |
| ) |
| glGetProgramLocalParameterfvARB=wrapper.wrapper(glGetProgramLocalParameterfvARB).setOutput( |
| 'params',size=(4,),orPassIn=True |
| ) |
| glGetProgramivARB=wrapper.wrapper(glGetProgramivARB).setOutput( |
| 'params',size=(1,),orPassIn=True |
| ) |
| |
| |
|
|
