docs/_extra/specs/MESA_pixmap_colormap.spec

   1 Name
   2
   3     MESA_pixmap_colormap
   4
   5 Name Strings
   6
   7     GLX_MESA_pixmap_colormap
   8
   9 Contact
  10
  11     Brian Paul (brian.paul 'at' tungstengraphics.com)
  12
  13 Status
  14
  15     Shipping since Mesa 1.2.8 in May, 1996.
  16
  17 Version
  18
  19     Last Modified Date:  8 June 2000
  20
  21 Number
  22
  23     216
  24
  25 Dependencies
  26
  27     OpenGL 1.0 or later is required.
  28     GLX 1.0 or later is required.
  29
  30 Overview
  31
  32     Since Mesa allows RGB rendering into drawables with PseudoColor,
  33     StaticColor, GrayScale and StaticGray visuals, Mesa needs a colormap
  34     in order to compute pixel values during rendering.
  35
  36     The colormap associated with a window can be queried with normal
  37     Xlib functions but there is no colormap associated with pixmaps.
  38
  39     The glXCreateGLXPixmapMESA function is an alternative to glXCreateGLXPixmap
  40     which allows specification of a colormap.
  41
  42 IP Status
  43
  44     Open-source; freely implementable.
  45
  46 Issues
  47
  48     None.
  49
  50 New Procedures and Functions
  51
  52     GLXPixmap glXCreateGLXPixmapMESA( Display *dpy, XVisualInfo *visual,
  53                                       Pixmap pixmap, Colormap cmap );
  54
  55 New Tokens
  56
  57     None.
  58
  59 Additions to Chapter 3 of the GLX 1.3 Specification (Functions and Errors)
  60
  61     Add to section 3.4.2 Off Screen Rendering
  62
  63     The Mesa implementation of GLX allows RGB rendering into X windows and
  64     pixmaps of any visual class, not just TrueColor or DirectColor.  In order
  65     to compute pixel values from RGB values Mesa requires a colormap.
  66
  67     The function
  68
  69         GLXPixmap glXCreateGLXPixmapMESA( Display *dpy, XVisualInfo *visual,
  70                                           Pixmap pixmap, Colormap cmap );
  71
  72     allows one to create a GLXPixmap with a specific colormap.  The image
  73     rendered into the pixmap may then be copied to a window (which uses the
  74     same colormap and visual) with the expected results.
  75
  76 GLX Protocol
  77
  78     None since this is a client-side extension.
  79
  80 Errors
  81
  82     None.
  83
  84 New State
  85
  86     None.
  87
  88 Revision History
  89
  90     8 June 2000 - initial specification