core  array_cache  math  swrast  swrast_setup  tnl  tnl_dd             

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SWvertex Struct Reference

Data-structure to handle vertices in the software rasterizer. More...

#include <swrast.h>

Data Fields
GLfloat	win [4]
	win[0], win[1] are the screen-coords of SWvertex. More...
GLfloat	texcoord [MAX_TEXTURE_COORD_UNITS][4]
GLchan	color [4]
GLchan	specular [4]
GLfloat	fog
GLfloat	index
GLfloat	pointSize

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Detailed Description

Data-structure to handle vertices in the software rasterizer.

The software rasterizer now uses this format for vertices. Thus a 'RasterSetup' stage or other translation is required between the tnl module and the swrast rasterization functions. This serves to isolate the swrast module from the internals of the tnl module, and improve its usefulness as a fallback mechanism for hardware drivers.

Full software drivers:

• Register the rastersetup and triangle functions from utils/software_helper.
• On statechange, update the rasterization pointers in that module.

Rasterization hardware drivers:

• Keep native rastersetup.
• Implement native twoside,offset and unfilled triangle setup.
• Implement a translator from native vertices to swrast vertices.
• On partial fallback (mix of accelerated and unaccelerated prims), call a pass-through function which translates native vertices to SWvertices and calls the appropriate swrast function.
• On total fallback (vertex format insufficient for state or all primitives unaccelerated), hook in swrast_setup instead.

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Field Documentation

GLchan SWvertex::color[4]

GLfloat SWvertex::fog

GLfloat SWvertex::index

GLfloat SWvertex::pointSize

GLchan SWvertex::specular[4]

GLfloat SWvertex::texcoord[MAX_TEXTURE_COORD_UNITS][4]

GLfloat SWvertex::win[4]

win[0], win[1] are the screen-coords of SWvertex. win[2] is the z-coord. what is win[3]?

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The documentation for this struct was generated from the following file:

• swrast.h

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