| 1 | /* $Id: winpos.c,v 1.2 2000-03-01 18:49:40 jeroen Exp $ */
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| 2 |
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| 3 | /*
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| 4 | * Mesa 3-D graphics library
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| 5 | * Version: 3.1
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| 6 | *
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| 7 | * Copyright (C) 1999 Brian Paul All Rights Reserved.
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| 8 | *
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| 9 | * Permission is hereby granted, free of charge, to any person obtaining a
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| 10 | * copy of this software and associated documentation files (the "Software"),
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| 11 | * to deal in the Software without restriction, including without limitation
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| 12 | * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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| 13 | * and/or sell copies of the Software, and to permit persons to whom the
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| 14 | * Software is furnished to do so, subject to the following conditions:
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| 15 | *
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| 16 | * The above copyright notice and this permission notice shall be included
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| 17 | * in all copies or substantial portions of the Software.
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| 18 | *
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| 19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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| 20 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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| 21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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| 22 | * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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| 23 | * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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| 24 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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| 25 | */
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| 26 | /* $XFree86: xc/lib/GL/mesa/src/winpos.c,v 1.2 1999/04/04 00:20:36 dawes Exp $ */
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| 27 |
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| 28 |
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| 29 |
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| 30 |
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| 31 |
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| 32 | /*
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| 33 | * GL_MESA_window_pos extension
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| 34 | *
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| 35 | * This extension offers a set of functions named glWindowPos*MESA() which
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| 36 | * directly set the current raster position to the given window coordinate.
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| 37 | * glWindowPos*MESA() are similar to glRasterPos*() but bypass the
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| 38 | * modelview, projection and viewport transformations.
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| 39 | *
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| 40 | * These functions should be very handy in conjunction with glDrawPixels()
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| 41 | * and glCopyPixels().
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| 42 | *
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| 43 | * If your application uses glWindowPos*MESA() and may be compiled with
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| 44 | * a real OpenGL instead of Mesa you can simply copy the winpos.[ch] files
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| 45 | * into your source tree and compile them with the rest of your code
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| 46 | * since glWindowPos*MESA() can, and is, implemented in terms of standard
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| 47 | * OpenGL commands when not using Mesa. In your source files which use
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| 48 | * glWindowPos*MESA() just #include "winpos.h".
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| 49 | */
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| 50 |
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| 51 |
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| 52 |
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| 53 | #ifdef PC_HEADER
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| 54 | #include "all.h"
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| 55 | #else
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| 56 | #include "gl.h"
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| 57 | #endif
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| 58 |
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| 59 | #ifdef GL_MESA_window_pos
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| 60 |
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| 61 |
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| 62 | #ifndef PC_HEADER
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| 63 | #ifdef XFree86Server
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| 64 | #include "GL/xf86glx.h"
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| 65 | #endif
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| 66 | #include "rastpos.h"
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| 67 | #include "winpos.h"
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| 68 | #endif
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| 69 |
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| 70 |
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| 71 |
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| 72 | /*
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| 73 | * Mesa implementation of glWindowPos*MESA()
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| 74 | */
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| 75 | void gl_WindowPos4fMESA( GLcontext *ctx,
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| 76 | GLfloat x, GLfloat y, GLfloat z, GLfloat w )
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| 77 | {
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| 78 | gl_windowpos( ctx, x, y, z, w );
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| 79 | }
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| 80 |
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| 81 |
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| 82 | #else
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| 83 |
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| 84 |
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| 85 | /*
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| 86 | * OpenGL implementation of glWindowPos*MESA()
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| 87 | */
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| 88 | void glWindowPos4fMESA( GLfloat x, GLfloat y, GLfloat z, GLfloat w )
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| 89 | {
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| 90 | GLfloat fx, fy;
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| 91 |
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| 92 | /* Push current matrix mode and viewport attributes */
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| 93 | glPushAttrib( GL_TRANSFORM_BIT | GL_VIEWPORT_BIT );
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| 94 |
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| 95 | /* Setup projection parameters */
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| 96 | glMatrixMode( GL_PROJECTION );
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| 97 | glPushMatrix();
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| 98 | glLoadIdentity();
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| 99 | glMatrixMode( GL_MODELVIEW );
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| 100 | glPushMatrix();
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| 101 | glLoadIdentity();
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| 102 |
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| 103 | glDepthRange( z, z );
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| 104 | glViewport( (int) x - 1, (int) y - 1, 2, 2 );
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| 105 |
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| 106 | /* set the raster (window) position */
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| 107 | fx = x - (int) x;
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| 108 | fy = y - (int) y;
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| 109 | glRasterPos4f( fx, fy, 0.0, w );
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| 110 |
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| 111 | /* restore matrices, viewport and matrix mode */
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| 112 | glPopMatrix();
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| 113 | glMatrixMode( GL_PROJECTION );
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| 114 | glPopMatrix();
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| 115 |
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| 116 | glPopAttrib();
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| 117 | }
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| 118 |
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| 119 |
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| 120 | #endif
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| 121 |
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| 122 |
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| 123 |
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