1 /**************************************************************************
2 *
3 * Copyright 2008 VMware, Inc.
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 VMWARE 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 "util/u_prim.h"
31 #include "pipe/p_context.h"
32 #include "draw/draw_context.h"
33 #include "draw/draw_private.h"
34 #include "draw/draw_pt.h"
35 #include "draw/draw_vs.h"
36
37 #define DO_CLIP_XY 0x1
38 #define DO_CLIP_FULL_Z 0x2
39 #define DO_CLIP_HALF_Z 0x4
40 #define DO_CLIP_USER 0x8
41 #define DO_VIEWPORT 0x10
42 #define DO_EDGEFLAG 0x20
43 #define DO_CLIP_XY_GUARD_BAND 0x40
44
45
46 struct pt_post_vs {
47 struct draw_context *draw;
48
49 unsigned flags;
50
51 boolean (*run)( struct pt_post_vs *pvs,
52 struct draw_vertex_info *info,
53 const struct draw_prim_info *prim_info );
54 };
55
56 static inline void
initialize_vertex_header(struct vertex_header * header)57 initialize_vertex_header(struct vertex_header *header)
58 {
59 header->clipmask = 0;
60 header->edgeflag = 1;
61 header->pad = 0;
62 header->vertex_id = UNDEFINED_VERTEX_ID;
63 }
64
65 static inline float
dot4(const float * a,const float * b)66 dot4(const float *a, const float *b)
67 {
68 return (a[0]*b[0] +
69 a[1]*b[1] +
70 a[2]*b[2] +
71 a[3]*b[3]);
72 }
73
74 #define FLAGS (0)
75 #define TAG(x) x##_none
76 #include "draw_cliptest_tmp.h"
77
78 #define FLAGS (DO_CLIP_XY | DO_CLIP_FULL_Z | DO_VIEWPORT)
79 #define TAG(x) x##_xy_fullz_viewport
80 #include "draw_cliptest_tmp.h"
81
82 #define FLAGS (DO_CLIP_XY | DO_CLIP_HALF_Z | DO_VIEWPORT)
83 #define TAG(x) x##_xy_halfz_viewport
84 #include "draw_cliptest_tmp.h"
85
86 #define FLAGS (DO_CLIP_XY_GUARD_BAND | DO_CLIP_HALF_Z | DO_VIEWPORT)
87 #define TAG(x) x##_xy_gb_halfz_viewport
88 #include "draw_cliptest_tmp.h"
89
90 #define FLAGS (DO_CLIP_FULL_Z | DO_VIEWPORT)
91 #define TAG(x) x##_fullz_viewport
92 #include "draw_cliptest_tmp.h"
93
94 #define FLAGS (DO_CLIP_HALF_Z | DO_VIEWPORT)
95 #define TAG(x) x##_halfz_viewport
96 #include "draw_cliptest_tmp.h"
97
98 #define FLAGS (DO_CLIP_XY | DO_CLIP_FULL_Z | DO_CLIP_USER | DO_VIEWPORT)
99 #define TAG(x) x##_xy_fullz_user_viewport
100 #include "draw_cliptest_tmp.h"
101
102 #define FLAGS (DO_CLIP_XY | DO_CLIP_FULL_Z | DO_CLIP_USER | DO_VIEWPORT | DO_EDGEFLAG)
103 #define TAG(x) x##_xy_fullz_user_viewport_edgeflag
104 #include "draw_cliptest_tmp.h"
105
106
107
108 /* Don't want to create 64 versions of this function, so catch the
109 * less common ones here. This is looking like something which should
110 * be code-generated, perhaps appended to the end of the vertex
111 * shader.
112 */
113 #define FLAGS (pvs->flags)
114 #define TAG(x) x##_generic
115 #include "draw_cliptest_tmp.h"
116
117
118
draw_pt_post_vs_run(struct pt_post_vs * pvs,struct draw_vertex_info * info,const struct draw_prim_info * prim_info)119 boolean draw_pt_post_vs_run( struct pt_post_vs *pvs,
120 struct draw_vertex_info *info,
121 const struct draw_prim_info *prim_info )
122 {
123 return pvs->run( pvs, info, prim_info );
124 }
125
126
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 clip_halfz,boolean need_edgeflags)127 void draw_pt_post_vs_prepare( struct pt_post_vs *pvs,
128 boolean clip_xy,
129 boolean clip_z,
130 boolean clip_user,
131 boolean guard_band,
132 boolean bypass_viewport,
133 boolean clip_halfz,
134 boolean need_edgeflags )
135 {
136 pvs->flags = 0;
137
138 /* This combination not currently tested/in use:
139 */
140 if (!clip_halfz)
141 guard_band = FALSE;
142
143 if (clip_xy && !guard_band) {
144 pvs->flags |= DO_CLIP_XY;
145 ASSIGN_4V( pvs->draw->plane[0], -1, 0, 0, 1 );
146 ASSIGN_4V( pvs->draw->plane[1], 1, 0, 0, 1 );
147 ASSIGN_4V( pvs->draw->plane[2], 0, -1, 0, 1 );
148 ASSIGN_4V( pvs->draw->plane[3], 0, 1, 0, 1 );
149 }
150 else if (clip_xy && guard_band) {
151 pvs->flags |= DO_CLIP_XY_GUARD_BAND;
152 ASSIGN_4V( pvs->draw->plane[0], -0.5, 0, 0, 1 );
153 ASSIGN_4V( pvs->draw->plane[1], 0.5, 0, 0, 1 );
154 ASSIGN_4V( pvs->draw->plane[2], 0, -0.5, 0, 1 );
155 ASSIGN_4V( pvs->draw->plane[3], 0, 0.5, 0, 1 );
156 }
157
158 if (clip_z) {
159 if (clip_halfz) {
160 pvs->flags |= DO_CLIP_HALF_Z;
161 ASSIGN_4V( pvs->draw->plane[4], 0, 0, 1, 0 );
162 } else {
163 pvs->flags |= DO_CLIP_FULL_Z;
164 ASSIGN_4V( pvs->draw->plane[4], 0, 0, 1, 1 );
165 }
166 }
167
168 if (clip_user)
169 pvs->flags |= DO_CLIP_USER;
170
171 if (!bypass_viewport)
172 pvs->flags |= DO_VIEWPORT;
173
174 if (need_edgeflags)
175 pvs->flags |= DO_EDGEFLAG;
176
177 /* Now select the relevant function:
178 */
179 switch (pvs->flags) {
180 case 0:
181 pvs->run = do_cliptest_none;
182 break;
183
184 case DO_CLIP_XY | DO_CLIP_FULL_Z | DO_VIEWPORT:
185 pvs->run = do_cliptest_xy_fullz_viewport;
186 break;
187
188 case DO_CLIP_XY | DO_CLIP_HALF_Z | DO_VIEWPORT:
189 pvs->run = do_cliptest_xy_halfz_viewport;
190 break;
191
192 case DO_CLIP_XY_GUARD_BAND | DO_CLIP_HALF_Z | DO_VIEWPORT:
193 pvs->run = do_cliptest_xy_gb_halfz_viewport;
194 break;
195
196 case DO_CLIP_FULL_Z | DO_VIEWPORT:
197 pvs->run = do_cliptest_fullz_viewport;
198 break;
199
200 case DO_CLIP_HALF_Z | DO_VIEWPORT:
201 pvs->run = do_cliptest_halfz_viewport;
202 break;
203
204 case DO_CLIP_XY | DO_CLIP_FULL_Z | DO_CLIP_USER | DO_VIEWPORT:
205 pvs->run = do_cliptest_xy_fullz_user_viewport;
206 break;
207
208 case (DO_CLIP_XY | DO_CLIP_FULL_Z | DO_CLIP_USER |
209 DO_VIEWPORT | DO_EDGEFLAG):
210 pvs->run = do_cliptest_xy_fullz_user_viewport_edgeflag;
211 break;
212
213 default:
214 pvs->run = do_cliptest_generic;
215 break;
216 }
217 }
218
219
draw_pt_post_vs_create(struct draw_context * draw)220 struct pt_post_vs *draw_pt_post_vs_create( struct draw_context *draw )
221 {
222 struct pt_post_vs *pvs = CALLOC_STRUCT( pt_post_vs );
223 if (!pvs)
224 return NULL;
225
226 pvs->draw = draw;
227
228 return pvs;
229 }
230
draw_pt_post_vs_destroy(struct pt_post_vs * pvs)231 void draw_pt_post_vs_destroy( struct pt_post_vs *pvs )
232 {
233 FREE(pvs);
234 }
235