IABSD.fr/xenocara/lib/mesa/docs/perf.rst

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• Author : jsg
  Date : 2023-01-28 08:09:28
  Hash : 5642995e
  Message : Import Mesa 22.3.4

• lib/mesa/docs/perf.rst

• Performance Tips
  ================
  
  Performance tips for software rendering:
  
  #. Turn off smooth shading when you don't need it (glShadeModel)
  #. Turn off depth buffering when you don't need it.
  #. Turn off dithering when not needed.
  #. Use double buffering as it's often faster than single buffering
  #. Compile in the X Shared Memory extension option if it's supported on
     your system by adding -DSHM to CFLAGS and -lXext to XLIBS for your
     system in the Make-config file.
  #. Recompile Mesa with more optimization if possible.
  #. Try to maximize the amount of drawing done between glBegin/glEnd
     pairs.
  #. Use the MESA_BACK_BUFFER variable to find best performance in double
     buffered mode. (X users only)
  #. Optimized polygon rasterizers are employed when: rendering into back
     buffer which is an XImage RGB mode, not grayscale, not monochrome
     depth buffering is GL_LESS, or disabled flat or smooth shading
     dithered or non-dithered no other rasterization operations enabled
     (blending, stencil, etc)
  #. Optimized line drawing is employed when: rendering into back buffer
     which is an XImage RGB mode, not grayscale, not monochrome depth
     buffering is GL_LESS or disabled flat shading dithered or
     non-dithered no other rasterization operations enabled (blending,
     stencil, etc)
  #. Textured polygons are fastest when: using a 3-component (RGB), 2-D
     texture minification and magnification filters are GL_NEAREST texture
     coordinate wrap modes for S and T are GL_REPEAT GL_DECAL environment
     mode glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_FASTEST ) depth
     buffering is GL_LESS or disabled
  #. Lighting is fastest when: Two-sided lighting is disabled
     GL_LIGHT_MODEL_LOCAL_VIEWER is false GL_COLOR_MATERIAL is disabled No
     spot lights are used (all GL_SPOT_CUTOFFs are 180.0) No local lights
     are used (all position W's are 0.0) All material and light
     coefficients are >= zero
  #. XFree86 users: if you want to use 24-bit color try starting your X
     server in 32-bit per pixel mode for better performance. That is,
     start your X server with startx -- -bpp 32 instead of startx -- -bpp
     24
  #. Try disabling dithering with the MESA_NO_DITHER environment variable.
     If this environment variable is defined Mesa will disable dithering
     and the command glEnable(GL_DITHER) will be ignored.