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/* $Id: winpos.c,v 1.2 1999/12/07 03:37:15 daryll Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.1
*
* Copyright (C) 1999 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/* $XFree86: xc/lib/GL/mesa/src/winpos.c,v 1.2 1999/04/04 00:20:36 dawes Exp $ */
/*
* 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".
*/
#ifdef PC_HEADER
#include "all.h"
#else
#include "GL/gl.h"
#endif
#ifdef GL_MESA_window_pos
#ifndef PC_HEADER
#ifdef XFree86Server
#include "GL/xf86glx.h"
#endif
#include "rastpos.h"
#include "winpos.h"
#endif
/*
* 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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