initial rev

1999-07-20 00:30:41 +00:00
parent 99412b9f1e
commit 3e07e16ac7
2 changed files with 196 additions and 0 deletions
--- a/docs/MESA_window_pos.spec
+++ b/docs/MESA_window_pos.spec
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+Name
+
+    MESA_window_pos
+
+Name Strings
+
+    GL_MESA_window_pos
+
+Contact
+
+    Brian Paul, brianp 'at' mesa3d.org
+
+Status
+
+    Shipping (since Mesa version 1.2.8)
+
+Version
+
+    $Id: MESA_window_pos.spec,v 1.1 1999/07/20 00:30:41 brianp Exp $
+
+Number
+
+    XXX non assigned
+
+Dependencies
+
+    OpenGL 1.0 is required.
+    The extension is written against the OpenGL 1.2 Specification
+
+Overview
+
+    In order to set the current raster position to a specific window
+    coordinate with the RasterPos command, the modelview matrix, projection
+    matrix and viewport must be set very carefully.  Furthermore, if the
+    desired window coordinate is outside of the window's bounds one must
+    rely a subtle side-effect of the Bitmap command in order to circumvent
+    frustum clipping.
+
+    This extension provides a set of functions to directly set the
+    current raster position, bypassing the modelview matrix, the
+    projection matrix and the viewport to window mapping.  Furthermore,
+    clip testing is not performed.
+
+    This greatly simplifies the process of setting the current raster
+    position to a specific window coordinate prior to calling DrawPixels,
+    CopyPixels or Bitmap.
+
+New Procedures and Functions
+
+    void WindowPos2dMESA(double x, double y)
+    void WindowPos2fMESA(float x, float y)
+    void WindowPos2iMESA(int x, int y)
+    void WindowPos2sMESA(short x, short y)
+
+New Tokens
+
+    none
+
+Additions to Chapter 2 of the OpenGL 1.2 Specification (OpenGL Operation)
+
+  - (2.12, p. 41) Insert after third paragraph:
+
+      Alternately, the current raster position may be set by one of the
+      WindowPosMESA commands:
+
+         void WindowPos{234}{sidf}MESA( T coords );
+         void Window Pos{234}{sidf}vMESA( T coords );
+
+      WindosPos4MESA takes four values indicating x, y, z, and w.
+      WindowPos3MESA (or WindowPos2MESA) is analaguos, but sets only
+      x, y, and z with w implicitly set to 1 (or only x and y with z
+      implicititly set to 0 and w implicitly set to 1).
+
+      WindowPosMESA operates like RasterPos except that the current modelview
+      matrix, projection matrix and viewport parameters are ignored and the
+      clip test operation always passes.  The current raster position values
+      are directly set to the parameters passed to WindowPosMESA.  The current
+      color, color index and texture coordinate update the current raster
+      position's associated data.
+
+      The current raster distance ??? XXX ???
+
+
+
+
+
+
+
+Additions to the AGL/GLX/WGL Specifications
+
+    None
+
+GLX Protocol
+
+    Not specified at this time.  However, a protocol message very similar
+    to that of RasterPos is expected.
+
+Errors
+
+    INVALID_OPERATION is generated if WindowPosMESA is called betweeen
+    Begin and End.
+
+
+New State
+
+    None.
+
+New Implementation Dependent State
+
+    None.
+
+Revision History
+
+  * Revision 1.0 - Initial specification