Re: [Mesa3d-users] Anti-aliasing lines Intel GMA 4500 question

[Stefan P. <sp...@sy...>]

Hi Brian,

Probable this would make things clear:

Nvidia:
  OpenGL vendor string: NVIDIA Corporation
  OpenGL renderer string: Quadro FX 1500/PCI/SSE2
  OpenGL version string: 2.1.2 NVIDIA 190.53

  GL_LINE_WIDTH_GRANULARITY = 0.1
  GL_LINE_WIDTH_RANGE = 0.5 10.0


Intel:
  OpenGL vendor string: Tungsten Graphics, Inc
  OpenGL renderer string: Mesa DRI Mobile Intel GM45 Express Chipset
                          GEM 20090712 2009Q2 RC3
  OpenGL version string: 2.1 Mesa 7.6
  GL_LINE_WIDTH_GRANULARITY = 0.5
  GL_LINE_WIDTH_RANGE = 1.0 5.0

As you said with NVIDIA I have much higher degree and better quality.
So this looks specific to each OpenGL implementation. Question is why in 
Mesa we have GL_LINE_WIDTH_GRANULARITY = 0.5 instead of 0.1 like in NVIDIA 
case ? Is it direct dependant of the GPU, or the driver ... !?

Many thanks,
Stefan