draw_pt_post_vs.c revision 4465efc3bf8d755a9afb7a4bb5382e2f5bf113e1 
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
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
45struct 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
54static INLINE void
55initialize_vertex_header(struct vertex_header *header)
56{
57   header->clipmask = 0;
58   header->edgeflag = 1;
59   header->pad = 0;
60   header->vertex_id = UNDEFINED_VERTEX_ID;
61}
62
63static INLINE float
64dot4(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
117boolean 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
124void 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
217struct 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
228void draw_pt_post_vs_destroy( struct pt_post_vs *pvs )
229{
230   FREE(pvs);
231}
232