source: branches/swt/src/opengl/mesa/clip_tmp.h

Last change on this file was 3582, checked in by jeroen, 26 years ago

* empty log message *
File size: 6.0 KB
Line 
1/* $Id: clip_tmp.h,v 1.3 2000-05-21 20:17:32 jeroen Exp $ */
2
3/*
4 * Mesa 3-D graphics library
5 * Version: 3.1
6 *
7 * Copyright (C) 1999 Brian Paul All Rights Reserved.
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included
17 * in all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
23 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
24 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 */
26
27/*
28 * New (3.1) transformation code written by Keith Whitwell.
29 */
30
31
32/* KW: a clever asm implementation would nestle integer versions
33 * of the outcode calculation underneath the division. Gcc won't
34 * do this, strangely enough, so I only do the divide in
35 * the case where the cliptest passes. This isn't essential,
36 * and an asm implementation needn't replicate that behaviour.
37 */
38static GLvector4f * _XFORMAPI TAG(cliptest_points4)( GLvector4f *clip_vec,
39 GLvector4f *proj_vec,
40 GLubyte clipMask[],
41 GLubyte *orMask,
42 GLubyte *andMask )
43{
44 const GLuint stride = clip_vec->stride;
45 const GLfloat *from = (GLfloat *)clip_vec->start;
46 const GLuint count = clip_vec->count;
47 GLuint c = 0;
48 GLfloat (*vProj)[4] = (GLfloat (*)[4])proj_vec->start;
49 GLubyte tmpAndMask = *andMask;
50 GLubyte tmpOrMask = *orMask;
51 GLuint i;
52 STRIDE_LOOP {
53 const GLfloat cx = from[0];
54 const GLfloat cy = from[1];
55 const GLfloat cz = from[2];
56 const GLfloat cw = from[3];
57#if defined(macintosh)
58 /* on powerpc cliptest is 17% faster in this way. */
59 GLuint mask;
60 mask = (((cw < cx) << CLIP_RIGHT_SHIFT));
61 mask |= (((cw < -cx) << CLIP_LEFT_SHIFT));
62 mask |= (((cw < cy) << CLIP_TOP_SHIFT));
63 mask |= (((cw < -cy) << CLIP_BOTTOM_SHIFT));
64 mask |= (((cw < cz) << CLIP_FAR_SHIFT));
65 mask |= (((cw < -cz) << CLIP_NEAR_SHIFT));
66#else /* !defined(macintosh)) */
67 GLubyte mask = 0;
68 if (-cx + cw < 0) mask |= CLIP_RIGHT_BIT;
69 if ( cx + cw < 0) mask |= CLIP_LEFT_BIT;
70 if (-cy + cw < 0) mask |= CLIP_TOP_BIT;
71 if ( cy + cw < 0) mask |= CLIP_BOTTOM_BIT;
72 if (-cz + cw < 0) mask |= CLIP_FAR_BIT;
73 if ( cz + cw < 0) mask |= CLIP_NEAR_BIT;
74#endif /* defined(macintosh) */
75
76 clipMask[i] = mask;
77 if (mask) {
78 c++;
79 tmpAndMask &= mask;
80 tmpOrMask |= mask;
81 vProj[i][0] = 0; /* no longer required? */
82 vProj[i][1] = 0;
83 vProj[i][2] = 0;
84 vProj[i][3] = 1;
85 } else {
86 GLfloat oow = 1.0F / cw;
87 vProj[i][3] = oow;
88 vProj[i][0] = cx * oow;
89 vProj[i][1] = cy * oow;
90 vProj[i][2] = cz * oow;
91 }
92 }
93
94 *orMask = tmpOrMask;
95 *andMask = (GLubyte) (c < count ? 0 : tmpAndMask);
96
97 proj_vec->flags |= VEC_SIZE_4;
98 proj_vec->size = 3;
99 proj_vec->count = clip_vec->count;
100 return proj_vec;
101}
102
103static GLvector4f * _XFORMAPI TAG(cliptest_points3)( GLvector4f *clip_vec,
104 GLvector4f *proj_vec,
105 GLubyte clipMask[],
106 GLubyte *orMask,
107 GLubyte *andMask )
108{
109 const GLuint stride = clip_vec->stride;
110 const GLuint count = clip_vec->count;
111 const GLfloat *from = (GLfloat *)clip_vec->start;
112
113 GLubyte tmpOrMask = *orMask;
114 GLubyte tmpAndMask = *andMask;
115 GLuint i;
116 STRIDE_LOOP {
117 const GLfloat cx = from[0], cy = from[1], cz = from[2];
118 GLubyte mask = 0;
119 if (cx > 1.0) mask |= CLIP_RIGHT_BIT;
120 else if (cx < -1.0) mask |= CLIP_LEFT_BIT;
121 if (cy > 1.0) mask |= CLIP_TOP_BIT;
122 else if (cy < -1.0) mask |= CLIP_BOTTOM_BIT;
123 if (cz > 1.0) mask |= CLIP_FAR_BIT;
124 else if (cz < -1.0) mask |= CLIP_NEAR_BIT;
125 clipMask[i] = mask;
126 tmpOrMask |= mask;
127 tmpAndMask &= mask;
128 }
129
130 gl_vector4f_clean_elem(proj_vec, count, 3);
131
132 *orMask = tmpOrMask;
133 *andMask = tmpAndMask;
134 return clip_vec;
135}
136
137static GLvector4f * _XFORMAPI TAG(cliptest_points2)( GLvector4f *clip_vec,
138 GLvector4f *proj_vec,
139 GLubyte clipMask[],
140 GLubyte *orMask,
141 GLubyte *andMask )
142{
143 const GLuint stride = clip_vec->stride;
144 const GLuint count = clip_vec->count;
145 const GLfloat *from = (GLfloat *)clip_vec->start;
146
147 GLubyte tmpOrMask = *orMask;
148 GLubyte tmpAndMask = *andMask;
149 GLuint i;
150 STRIDE_LOOP {
151 const GLfloat cx = from[0], cy = from[1];
152 GLubyte mask = 0;
153 if (cx > 1.0) mask |= CLIP_RIGHT_BIT;
154 else if (cx < -1.0) mask |= CLIP_LEFT_BIT;
155 if (cy > 1.0) mask |= CLIP_TOP_BIT;
156 else if (cy < -1.0) mask |= CLIP_BOTTOM_BIT;
157 clipMask[i] = mask;
158 tmpOrMask |= mask;
159 tmpAndMask &= mask;
160 }
161
162 gl_vector4f_clean_elem(proj_vec, count, 3);
163
164 *orMask = tmpOrMask;
165 *andMask = tmpAndMask;
166 return clip_vec;
167}
168
169
170static void TAG(init_c_cliptest)( void )
171{
172 gl_clip_tab[4] = TAG(cliptest_points4);
173 gl_clip_tab[3] = TAG(cliptest_points3);
174 gl_clip_tab[2] = TAG(cliptest_points2);
175}
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