1 /**************************************************************************
2 *
3 * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28 #include "util/u_memory.h"
29 #include "util/u_math.h"
30 #include "pipe/p_context.h"
31 #include "draw/draw_context.h"
32 #include "draw/draw_private.h"
33 #include "draw/draw_pt.h"
34 #include "draw/draw_vs.h"
35
36 #define DO_CLIP_XY 0x1
37 #define DO_CLIP_FULL_Z 0x2
38 #define DO_CLIP_HALF_Z 0x4
39 #define DO_CLIP_USER 0x8
40 #define DO_VIEWPORT 0x10
41 #define DO_EDGEFLAG 0x20
42 #define DO_CLIP_XY_GUARD_BAND 0x40
43
44
45 struct pt_post_vs {
46 struct draw_context *draw;
47
48 unsigned flags;
49
50 boolean (*run)( struct pt_post_vs *pvs,
51 struct draw_vertex_info *info );
52 };
53
54 static INLINE void
initialize_vertex_header(struct vertex_header * header)55 initialize_vertex_header(struct vertex_header *header)
56 {
57 header->clipmask = 0;
58 header->edgeflag = 1;
59 header->have_clipdist = 0;
60 header->vertex_id = UNDEFINED_VERTEX_ID;
61 }
62
63 static INLINE float
dot4(const float * a,const float * b)64 dot4(const float *a, const float *b)
65 {
66 return (a[0]*b[0] +
67 a[1]*b[1] +
68 a[2]*b[2] +
69 a[3]*b[3]);
70 }
71
72 #define FLAGS (0)
73 #define TAG(x) x##_none
74 #include "draw_cliptest_tmp.h"
75
76 #define FLAGS (DO_CLIP_XY | DO_CLIP_FULL_Z | DO_VIEWPORT)
77 #define TAG(x) x##_xy_fullz_viewport
78 #include "draw_cliptest_tmp.h"
79
80 #define FLAGS (DO_CLIP_XY | DO_CLIP_HALF_Z | DO_VIEWPORT)
81 #define TAG(x) x##_xy_halfz_viewport
82 #include "draw_cliptest_tmp.h"
83
84 #define FLAGS (DO_CLIP_XY_GUARD_BAND | DO_CLIP_HALF_Z | DO_VIEWPORT)
85 #define TAG(x) x##_xy_gb_halfz_viewport
86 #include "draw_cliptest_tmp.h"
87
88 #define FLAGS (DO_CLIP_FULL_Z | DO_VIEWPORT)
89 #define TAG(x) x##_fullz_viewport
90 #include "draw_cliptest_tmp.h"
91
92 #define FLAGS (DO_CLIP_HALF_Z | DO_VIEWPORT)
93 #define TAG(x) x##_halfz_viewport
94 #include "draw_cliptest_tmp.h"
95
96 #define FLAGS (DO_CLIP_XY | DO_CLIP_FULL_Z | DO_CLIP_USER | DO_VIEWPORT)
97 #define TAG(x) x##_xy_fullz_user_viewport
98 #include "draw_cliptest_tmp.h"
99
100 #define FLAGS (DO_CLIP_XY | DO_CLIP_FULL_Z | DO_CLIP_USER | DO_VIEWPORT | DO_EDGEFLAG)
101 #define TAG(x) x##_xy_fullz_user_viewport_edgeflag
102 #include "draw_cliptest_tmp.h"
103
104
105
106 /* Don't want to create 64 versions of this function, so catch the
107 * less common ones here. This is looking like something which should
108 * be code-generated, perhaps appended to the end of the vertex
109 * shader.
110 */
111 #define FLAGS (pvs->flags)
112 #define TAG(x) x##_generic
113 #include "draw_cliptest_tmp.h"
114
115
116
draw_pt_post_vs_run(struct pt_post_vs * pvs,struct draw_vertex_info * info)117 boolean draw_pt_post_vs_run( struct pt_post_vs *pvs,
118 struct draw_vertex_info *info )
119 {
120 return pvs->run( pvs, info );
121 }
122
123
draw_pt_post_vs_prepare(struct pt_post_vs * pvs,boolean clip_xy,boolean clip_z,boolean clip_user,boolean guard_band,boolean bypass_viewport,boolean opengl,boolean need_edgeflags)124 void draw_pt_post_vs_prepare( struct pt_post_vs *pvs,
125 boolean clip_xy,
126 boolean clip_z,
127 boolean clip_user,
128 boolean guard_band,
129 boolean bypass_viewport,
130 boolean opengl,
131 boolean need_edgeflags )
132 {
133 pvs->flags = 0;
134
135 /* This combination not currently tested/in use:
136 */
137 if (opengl)
138 guard_band = FALSE;
139
140 if (clip_xy && !guard_band) {
141 pvs->flags |= DO_CLIP_XY;
142 ASSIGN_4V( pvs->draw->plane[0], -1, 0, 0, 1 );
143 ASSIGN_4V( pvs->draw->plane[1], 1, 0, 0, 1 );
144 ASSIGN_4V( pvs->draw->plane[2], 0, -1, 0, 1 );
145 ASSIGN_4V( pvs->draw->plane[3], 0, 1, 0, 1 );
146 }
147 else if (clip_xy && guard_band) {
148 pvs->flags |= DO_CLIP_XY_GUARD_BAND;
149 ASSIGN_4V( pvs->draw->plane[0], -0.5, 0, 0, 1 );
150 ASSIGN_4V( pvs->draw->plane[1], 0.5, 0, 0, 1 );
151 ASSIGN_4V( pvs->draw->plane[2], 0, -0.5, 0, 1 );
152 ASSIGN_4V( pvs->draw->plane[3], 0, 0.5, 0, 1 );
153 }
154
155 if (clip_z && opengl) {
156 pvs->flags |= DO_CLIP_FULL_Z;
157 ASSIGN_4V( pvs->draw->plane[4], 0, 0, 1, 1 );
158 }
159
160 if (clip_z && !opengl) {
161 pvs->flags |= DO_CLIP_HALF_Z;
162 ASSIGN_4V( pvs->draw->plane[4], 0, 0, 1, 0 );
163 }
164
165 if (clip_user)
166 pvs->flags |= DO_CLIP_USER;
167
168 if (!bypass_viewport)
169 pvs->flags |= DO_VIEWPORT;
170
171 if (need_edgeflags)
172 pvs->flags |= DO_EDGEFLAG;
173
174 /* Now select the relevant function:
175 */
176 switch (pvs->flags) {
177 case 0:
178 pvs->run = do_cliptest_none;
179 break;
180
181 case DO_CLIP_XY | DO_CLIP_FULL_Z | DO_VIEWPORT:
182 pvs->run = do_cliptest_xy_fullz_viewport;
183 break;
184
185 case DO_CLIP_XY | DO_CLIP_HALF_Z | DO_VIEWPORT:
186 pvs->run = do_cliptest_xy_halfz_viewport;
187 break;
188
189 case DO_CLIP_XY_GUARD_BAND | DO_CLIP_HALF_Z | DO_VIEWPORT:
190 pvs->run = do_cliptest_xy_gb_halfz_viewport;
191 break;
192
193 case DO_CLIP_FULL_Z | DO_VIEWPORT:
194 pvs->run = do_cliptest_fullz_viewport;
195 break;
196
197 case DO_CLIP_HALF_Z | DO_VIEWPORT:
198 pvs->run = do_cliptest_halfz_viewport;
199 break;
200
201 case DO_CLIP_XY | DO_CLIP_FULL_Z | DO_CLIP_USER | DO_VIEWPORT:
202 pvs->run = do_cliptest_xy_fullz_user_viewport;
203 break;
204
205 case (DO_CLIP_XY | DO_CLIP_FULL_Z | DO_CLIP_USER |
206 DO_VIEWPORT | DO_EDGEFLAG):
207 pvs->run = do_cliptest_xy_fullz_user_viewport_edgeflag;
208 break;
209
210 default:
211 pvs->run = do_cliptest_generic;
212 break;
213 }
214 }
215
216
draw_pt_post_vs_create(struct draw_context * draw)217 struct pt_post_vs *draw_pt_post_vs_create( struct draw_context *draw )
218 {
219 struct pt_post_vs *pvs = CALLOC_STRUCT( pt_post_vs );
220 if (!pvs)
221 return NULL;
222
223 pvs->draw = draw;
224
225 return pvs;
226 }
227
draw_pt_post_vs_destroy(struct pt_post_vs * pvs)228 void draw_pt_post_vs_destroy( struct pt_post_vs *pvs )
229 {
230 FREE(pvs);
231 }
232