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