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[mesa.git] / docs / MESA_pixmap_colormap.spec

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+Name
+
+    MESA_copy_sub_buffer
+
+Name Strings
+
+    GLX_MESA_copy_sub_buffer
+
+Contact
+
+    Brian Paul (brian 'at' mesa3d.org)
+
+Status
+
+    Shipping since Mesa 1.2.8 in May, 1996.
+
+Version
+
+    Last Modified Date:  8 June 2000
+
+Number
+
+    ???
+
+Dependencies
+
+    OpenGL 1.0 or later is required.
+    GLX 1.0 or later is required.
+
+Overview
+
+    Since Mesa allows RGB rendering into drawables with PseudoColor,
+    StaticColor, GrayScale and StaticGray visuals, Mesa needs a colormap
+    in order to compute pixel values during rendering.
+
+    The colormap associated with a window can be queried with normal
+    Xlib functions but there is no colormap associated with pixmaps.
+
+    The glXCreateGLXPixmapMESA function is an alternative to glXCreateGLXPixmap
+    which allows specification of a colormap.
+
+IP Status
+
+    Open-source; freely implementable.
+
+Issues
+
+    None.
+
+New Procedures and Functions
+
+    GLXPixmap glXCreateGLXPixmapMESA( Display *dpy, XVisualInfo *visual,
+                                      Pixmap pixmap, Colormap cmap );
+
+New Tokens
+
+    None.
+
+Additions to Chapter 3 of the GLX 1.3 Specification (Functions and Errors)
+
+    Add to section 3.4.2 Off Screen Rendering
+
+    The Mesa implementation of GLX allows RGB rendering into X windows and
+    pixmaps of any visual class, not just TrueColor or DirectColor.  In order
+    to compute pixel values from RGB values Mesa requires a colormap.
+
+    The function
+
+        GLXPixmap glXCreateGLXPixmapMESA( Display *dpy, XVisualInfo *visual,
+                                          Pixmap pixmap, Colormap cmap );
+
+    allows one to create a GLXPixmap with a specific colormap.  The image
+    rendered into the pixmap may then be copied to a window (which uses the
+    same colormap and visual) with the expected results.
+
+GLX Protocol
+
+    None since this is a client-side extension.
+
+Errors
+
+    None.
+
+New State
+
+    None.
+
+Revision History
+
+    8 June 2000 - initial specification