summaryrefslogtreecommitdiff
path: root/src/gallium/drivers/softpipe/sp_quad_depth_test.c
blob: 33888abcc5ecbc0987a85907bfb8c232f690fe33 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
/**************************************************************************
 * 
 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
 * All Rights Reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 **************************************************************************/

/**
 * \brief  Quad depth testing
 */

#include "pipe/p_defines.h"
#include "pipe/p_util.h"
#include "sp_context.h"
#include "sp_headers.h"
#include "sp_surface.h"
#include "sp_quad.h"
#include "sp_tile_cache.h"


/**
 * Do depth testing for a quad.
 * Not static since it's used by the stencil code.
 */

/*
 * To increase efficiency, we should probably have multiple versions
 * of this function that are specifically for Z16, Z32 and FP Z buffers.
 * Try to effectively do that with codegen...
 */

void
sp_depth_test_quad(struct quad_stage *qs, struct quad_header *quad)
{
   struct softpipe_context *softpipe = qs->softpipe;
   struct pipe_surface *ps = softpipe->framebuffer.zsbuf;
   const enum pipe_format format = ps->format;
   unsigned bzzzz[QUAD_SIZE];  /**< Z values fetched from depth buffer */
   unsigned qzzzz[QUAD_SIZE];  /**< Z values from the quad */
   unsigned zmask = 0;
   unsigned j;
   struct softpipe_cached_tile *tile
      = sp_get_cached_tile(softpipe, softpipe->zsbuf_cache, quad->x0, quad->y0);

   assert(ps); /* shouldn't get here if there's no zbuffer */

   /*
    * Convert quad's float depth values to int depth values (qzzzz).
    * If the Z buffer stores integer values, we _have_ to do the depth
    * compares with integers (not floats).  Otherwise, the float->int->float
    * conversion of Z values (which isn't an identity function) will cause
    * Z-fighting errors.
    *
    * Also, get the zbuffer values (bzzzz) from the cached tile.
    */
   switch (format) {
   case PIPE_FORMAT_Z16_UNORM:
      {
         float scale = 65535.0;

         for (j = 0; j < QUAD_SIZE; j++) {
            qzzzz[j] = (unsigned) (quad->outputs.depth[j] * scale);
         }

         for (j = 0; j < QUAD_SIZE; j++) {
            int x = quad->x0 % TILE_SIZE + (j & 1);
            int y = quad->y0 % TILE_SIZE + (j >> 1);
            bzzzz[j] = tile->data.depth16[y][x];
         }
      }
      break;
   case PIPE_FORMAT_Z32_UNORM:
      {
         double scale = (double) (uint) ~0UL;

         for (j = 0; j < QUAD_SIZE; j++) {
            qzzzz[j] = (unsigned) (quad->outputs.depth[j] * scale);
         }

         for (j = 0; j < QUAD_SIZE; j++) {
            int x = quad->x0 % TILE_SIZE + (j & 1);
            int y = quad->y0 % TILE_SIZE + (j >> 1);
            bzzzz[j] = tile->data.depth32[y][x];
         }
      }
      break;
   case PIPE_FORMAT_S8Z24_UNORM:
      {
         float scale = (float) ((1 << 24) - 1);

         for (j = 0; j < QUAD_SIZE; j++) {
            qzzzz[j] = (unsigned) (quad->outputs.depth[j] * scale);
         }

         for (j = 0; j < QUAD_SIZE; j++) {
            int x = quad->x0 % TILE_SIZE + (j & 1);
            int y = quad->y0 % TILE_SIZE + (j >> 1);
            bzzzz[j] = tile->data.depth32[y][x] & 0xffffff;
         }
      }
      break;
   case PIPE_FORMAT_Z24S8_UNORM:
      {
         float scale = (float) ((1 << 24) - 1);

         for (j = 0; j < QUAD_SIZE; j++) {
            qzzzz[j] = (unsigned) (quad->outputs.depth[j] * scale);
         }

         for (j = 0; j < QUAD_SIZE; j++) {
            int x = quad->x0 % TILE_SIZE + (j & 1);
            int y = quad->y0 % TILE_SIZE + (j >> 1);
            bzzzz[j] = tile->data.depth32[y][x] >> 8;
         }
      }
      break;
   default:
      assert(0);
   }

   switch (softpipe->depth_stencil->depth.func) {
   case PIPE_FUNC_NEVER:
      /* zmask = 0 */
      break;
   case PIPE_FUNC_LESS:
      /* Note this is pretty much a single sse or cell instruction.  
       * Like this:  quad->mask &= (quad->outputs.depth < zzzz);
       */
      for (j = 0; j < QUAD_SIZE; j++) {
	 if (qzzzz[j] < bzzzz[j]) 
	    zmask |= 1 << j;
      }
      break;
   case PIPE_FUNC_EQUAL:
      for (j = 0; j < QUAD_SIZE; j++) {
	 if (qzzzz[j] == bzzzz[j]) 
	    zmask |= 1 << j;
      }
      break;
   case PIPE_FUNC_LEQUAL:
      for (j = 0; j < QUAD_SIZE; j++) {
	 if (qzzzz[j] <= bzzzz[j]) 
	    zmask |= (1 << j);
      }
      break;
   case PIPE_FUNC_GREATER:
      for (j = 0; j < QUAD_SIZE; j++) {
	 if (qzzzz[j] > bzzzz[j]) 
	    zmask |= (1 << j);
      }
      break;
   case PIPE_FUNC_NOTEQUAL:
      for (j = 0; j < QUAD_SIZE; j++) {
	 if (qzzzz[j] != bzzzz[j]) 
	    zmask |= (1 << j);
      }
      break;
   case PIPE_FUNC_GEQUAL:
      for (j = 0; j < QUAD_SIZE; j++) {
	 if (qzzzz[j] >= bzzzz[j]) 
	    zmask |= (1 << j);
      }
      break;
   case PIPE_FUNC_ALWAYS:
      zmask = MASK_ALL;
      break;
   default:
      assert(0);
   }

   quad->mask &= zmask;

   if (softpipe->depth_stencil->depth.writemask) {
      
      /* This is also efficient with sse / spe instructions: 
       */
      for (j = 0; j < QUAD_SIZE; j++) {
	 if (quad->mask & (1 << j)) {
	    bzzzz[j] = qzzzz[j];
	 }
      }

      /* put updated Z values back into cached tile */
      switch (format) {
      case PIPE_FORMAT_Z16_UNORM:
         for (j = 0; j < QUAD_SIZE; j++) {
            int x = quad->x0 % TILE_SIZE + (j & 1);
            int y = quad->y0 % TILE_SIZE + (j >> 1);
            tile->data.depth16[y][x] = (ushort) bzzzz[j];
         }
         break;
      case PIPE_FORMAT_Z32_UNORM:
         for (j = 0; j < QUAD_SIZE; j++) {
            int x = quad->x0 % TILE_SIZE + (j & 1);
            int y = quad->y0 % TILE_SIZE + (j >> 1);
            tile->data.depth32[y][x] = bzzzz[j];
         }
         break;
      case PIPE_FORMAT_S8Z24_UNORM:
         for (j = 0; j < QUAD_SIZE; j++) {
            int x = quad->x0 % TILE_SIZE + (j & 1);
            int y = quad->y0 % TILE_SIZE + (j >> 1);
            uint s8z24 = tile->data.depth32[y][x];
            s8z24 = (s8z24 & 0xff000000) | bzzzz[j];
            tile->data.depth32[y][x] = s8z24;
         }
         break;
      case PIPE_FORMAT_Z24S8_UNORM:
         for (j = 0; j < QUAD_SIZE; j++) {
            int x = quad->x0 % TILE_SIZE + (j & 1);
            int y = quad->y0 % TILE_SIZE + (j >> 1);
            uint z24s8 = tile->data.depth32[y][x];
            z24s8 = (z24s8 & 0xff) | (bzzzz[j] << 8);
            tile->data.depth32[y][x] = z24s8;
         }
         break;
      default:
         assert(0);
      }
   }
}


static void
depth_test_quad(struct quad_stage *qs, struct quad_header *quad)
{
   sp_depth_test_quad(qs, quad);

   if (quad->mask)
      qs->next->run(qs->next, quad);
}


static void depth_test_begin(struct quad_stage *qs)
{
   qs->next->begin(qs->next);
}


static void depth_test_destroy(struct quad_stage *qs)
{
   FREE( qs );
}


struct quad_stage *sp_quad_depth_test_stage( struct softpipe_context *softpipe )
{
   struct quad_stage *stage = CALLOC_STRUCT(quad_stage);

   stage->softpipe = softpipe;
   stage->begin = depth_test_begin;
   stage->run = depth_test_quad;
   stage->destroy = depth_test_destroy;

   return stage;
}