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/* $Id: winpos.c,v 1.2 1996/09/15 01:50:05 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 2.0
* Copyright (C) 1995-1996 Brian Paul
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* $Log: winpos.c,v $
* Revision 1.2 1996/09/15 01:50:05 brianp
* fixed #includes
*
* Revision 1.1 1996/09/13 01:38:16 brianp
* Initial revision
*
*/
/*
* GL_MESA_window_pos extension
*
* This extension offers a set of functions named glWindowPos*MESA() which
* directly set the current raster position to the given window coordinate.
* glWindowPos*MESA() are similar to glRasterPos*() but bypass the
* modelview, projection and viewport transformations.
*
* These functions should be very handy in conjunction with glDrawPixels()
* and glCopyPixels().
*
* If your application uses glWindowPos*MESA() and may be compiled with
* a real OpenGL instead of Mesa you can simply copy the winpos.[ch] files
* into your source tree and compile them with the rest of your code
* since glWindowPos*MESA() can, and is, implemented in terms of standard
* OpenGL commands when not using Mesa. In your source files which use
* glWindowPos*MESA() just #include "winpos.h".
*/
#include "GL/gl.h"
#ifdef GL_MESA_window_pos
#include "draw.h"
#include "dlist.h"
#include "macros.h"
#include "types.h"
#include "winpos.h"
/*
* Mesa implementation of glWindowPos*MESA()
*/
void gl_WindowPos4fMESA( GLcontext *ctx,
GLfloat x, GLfloat y, GLfloat z, GLfloat w )
{
gl_windowpos( ctx, x, y, z, w );
}
#else
/*
* OpenGL implementation of glWindowPos*MESA()
*/
void glWindowPos4fMESA( GLfloat x, GLfloat y, GLfloat z, GLfloat w )
{
GLfloat fx, fy;
/* Push current matrix mode and viewport attributes */
glPushAttrib( GL_TRANSFORM_BIT | GL_VIEWPORT_BIT );
/* Setup projection parameters */
glMatrixMode( GL_PROJECTION );
glPushMatrix();
glLoadIdentity();
glMatrixMode( GL_MODELVIEW );
glPushMatrix();
glLoadIdentity();
glDepthRange( z, z );
glViewport( (int) x - 1, (int) y - 1, 2, 2 );
/* set the raster (window) position */
fx = x - (int) x;
fy = y - (int) y;
glRasterPos4f( fx, fy, 0.0, w );
/* restore matrices, viewport and matrix mode */
glPopMatrix();
glMatrixMode( GL_PROJECTION );
glPopMatrix();
glPopAttrib();
}
#endif
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