-
Notifications
You must be signed in to change notification settings - Fork 0
/
d_parta.S
477 lines (404 loc) · 9.93 KB
/
d_parta.S
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
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
/*
Copyright (C) 1996-1997 Id Software, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
//
// d_parta.s
// x86 assembly-language 8-bpp particle-drawing code.
//
#include "asm_i386.h"
#include "quakeasm.h"
#include "d_ifacea.h"
#include "asm_draw.h"
#if id386
//----------------------------------------------------------------------
// 8-bpp particle drawing code.
//----------------------------------------------------------------------
//FIXME: comments, full optimization
//----------------------------------------------------------------------
// 8-bpp particle queueing code.
//----------------------------------------------------------------------
.text
#define P 12+4
.align 4
.globl C(D_DrawParticle)
C(D_DrawParticle):
pushl %ebp // preserve caller's stack frame
pushl %edi // preserve register variables
pushl %ebx
movl P(%esp),%edi
// FIXME: better FP overlap in general here
// transform point
// VectorSubtract (p->org, r_origin, local);
flds C(r_origin)
fsubrs pt_org(%edi)
flds pt_org+4(%edi)
fsubs C(r_origin)+4
flds pt_org+8(%edi)
fsubs C(r_origin)+8
fxch %st(2) // local[0] | local[1] | local[2]
// transformed[2] = DotProduct(local, r_ppn);
flds C(r_ppn) // r_ppn[0] | local[0] | local[1] | local[2]
fmul %st(1),%st(0) // dot0 | local[0] | local[1] | local[2]
flds C(r_ppn)+4 // r_ppn[1] | dot0 | local[0] | local[1] | local[2]
fmul %st(3),%st(0) // dot1 | dot0 | local[0] | local[1] | local[2]
flds C(r_ppn)+8 // r_ppn[2] | dot1 | dot0 | local[0] |
// local[1] | local[2]
fmul %st(5),%st(0) // dot2 | dot1 | dot0 | local[0] | local[1] | local[2]
fxch %st(2) // dot0 | dot1 | dot2 | local[0] | local[1] | local[2]
faddp %st(0),%st(1) // dot0 + dot1 | dot2 | local[0] | local[1] |
// local[2]
faddp %st(0),%st(1) // z | local[0] | local[1] | local[2]
fld %st(0) // z | z | local[0] | local[1] |
// local[2]
fdivrs float_1 // 1/z | z | local[0] | local[1] | local[2]
fxch %st(1) // z | 1/z | local[0] | local[1] | local[2]
// if (transformed[2] < PARTICLE_Z_CLIP)
// return;
fcomps float_particle_z_clip // 1/z | local[0] | local[1] | local[2]
fxch %st(3) // local[2] | local[0] | local[1] | 1/z
flds C(r_pup) // r_pup[0] | local[2] | local[0] | local[1] | 1/z
fmul %st(2),%st(0) // dot0 | local[2] | local[0] | local[1] | 1/z
flds C(r_pup)+4 // r_pup[1] | dot0 | local[2] | local[0] |
// local[1] | 1/z
fnstsw %ax
testb $1,%ah
jnz LPop6AndDone
// transformed[1] = DotProduct(local, r_pup);
fmul %st(4),%st(0) // dot1 | dot0 | local[2] | local[0] | local[1] | 1/z
flds C(r_pup)+8 // r_pup[2] | dot1 | dot0 | local[2] |
// local[0] | local[1] | 1/z
fmul %st(3),%st(0) // dot2 | dot1 | dot0 | local[2] | local[0] |
// local[1] | 1/z
fxch %st(2) // dot0 | dot1 | dot2 | local[2] | local[0] |
// local[1] | 1/z
faddp %st(0),%st(1) // dot0 + dot1 | dot2 | local[2] | local[0] |
// local[1] | 1/z
faddp %st(0),%st(1) // y | local[2] | local[0] | local[1] | 1/z
fxch %st(3) // local[1] | local[2] | local[0] | y | 1/z
// transformed[0] = DotProduct(local, r_pright);
fmuls C(r_pright)+4 // dot1 | local[2] | local[0] | y | 1/z
fxch %st(2) // local[0] | local[2] | dot1 | y | 1/z
fmuls C(r_pright) // dot0 | local[2] | dot1 | y | 1/z
fxch %st(1) // local[2] | dot0 | dot1 | y | 1/z
fmuls C(r_pright)+8 // dot2 | dot0 | dot1 | y | 1/z
fxch %st(2) // dot1 | dot0 | dot2 | y | 1/z
faddp %st(0),%st(1) // dot1 + dot0 | dot2 | y | 1/z
faddp %st(0),%st(1) // x | y | 1/z
fxch %st(1) // y | x | 1/z
// project the point
fmul %st(2),%st(0) // y/z | x | 1/z
fxch %st(1) // x | y/z | 1/z
fmul %st(2),%st(0) // x/z | y/z | 1/z
fxch %st(1) // y/z | x/z | 1/z
fsubrs C(ycenter) // v | x/z | 1/z
fxch %st(1) // x/z | v | 1/z
fadds C(xcenter) // u | v | 1/z
// FIXME: preadjust xcenter and ycenter
fxch %st(1) // v | u | 1/z
fadds float_point5 // v | u | 1/z
fxch %st(1) // u | v | 1/z
fadds float_point5 // u | v | 1/z
fxch %st(2) // 1/z | v | u
fmuls DP_32768 // 1/z * 0x8000 | v | u
fxch %st(2) // u | v | 1/z * 0x8000
// FIXME: use Terje's fp->int trick here?
// FIXME: check we're getting proper rounding here
fistpl DP_u // v | 1/z * 0x8000
fistpl DP_v // 1/z * 0x8000
movl DP_u,%eax
movl DP_v,%edx
// if ((v > d_vrectbottom_particle) ||
// (u > d_vrectright_particle) ||
// (v < d_vrecty) ||
// (u < d_vrectx))
// {
// continue;
// }
movl C(d_vrectbottom_particle),%ebx
movl C(d_vrectright_particle),%ecx
cmpl %ebx,%edx
jg LPop1AndDone
cmpl %ecx,%eax
jg LPop1AndDone
movl C(d_vrecty),%ebx
movl C(d_vrectx),%ecx
cmpl %ebx,%edx
jl LPop1AndDone
cmpl %ecx,%eax
jl LPop1AndDone
flds pt_color(%edi) // color | 1/z * 0x8000
// FIXME: use Terje's fast fp->int trick?
fistpl DP_Color // 1/z * 0x8000
movl C(d_viewbuffer),%ebx
addl %eax,%ebx
movl C(d_scantable)(,%edx,4),%edi // point to the pixel
imull C(d_zrowbytes),%edx // point to the z pixel
leal (%edx,%eax,2),%edx
movl C(d_pzbuffer),%eax
fistpl izi
addl %ebx,%edi
addl %eax,%edx
// pix = izi >> d_pix_shift;
movl izi,%eax
movl C(d_pix_shift),%ecx
shrl %cl,%eax
movl izi,%ebp
// if (pix < d_pix_min)
// pix = d_pix_min;
// else if (pix > d_pix_max)
// pix = d_pix_max;
movl C(d_pix_min),%ebx
movl C(d_pix_max),%ecx
cmpl %ebx,%eax
jnl LTestPixMax
movl %ebx,%eax
jmp LTestDone
LTestPixMax:
cmpl %ecx,%eax
jng LTestDone
movl %ecx,%eax
LTestDone:
movb DP_Color,%ch
movl C(d_y_aspect_shift),%ebx
testl %ebx,%ebx
jnz LDefault
cmpl $4,%eax
ja LDefault
jmp DP_EntryTable-4(,%eax,4)
// 1x1
.globl DP_1x1
DP_1x1:
cmpw %bp,(%edx) // just one pixel to do
jg LDone
movw %bp,(%edx)
movb %ch,(%edi)
jmp LDone
// 2x2
.globl DP_2x2
DP_2x2:
pushl %esi
movl C(screenwidth),%ebx
movl C(d_zrowbytes),%esi
cmpw %bp,(%edx)
jg L2x2_1
movw %bp,(%edx)
movb %ch,(%edi)
L2x2_1:
cmpw %bp,2(%edx)
jg L2x2_2
movw %bp,2(%edx)
movb %ch,1(%edi)
L2x2_2:
cmpw %bp,(%edx,%esi,1)
jg L2x2_3
movw %bp,(%edx,%esi,1)
movb %ch,(%edi,%ebx,1)
L2x2_3:
cmpw %bp,2(%edx,%esi,1)
jg L2x2_4
movw %bp,2(%edx,%esi,1)
movb %ch,1(%edi,%ebx,1)
L2x2_4:
popl %esi
jmp LDone
// 3x3
.globl DP_3x3
DP_3x3:
pushl %esi
movl C(screenwidth),%ebx
movl C(d_zrowbytes),%esi
cmpw %bp,(%edx)
jg L3x3_1
movw %bp,(%edx)
movb %ch,(%edi)
L3x3_1:
cmpw %bp,2(%edx)
jg L3x3_2
movw %bp,2(%edx)
movb %ch,1(%edi)
L3x3_2:
cmpw %bp,4(%edx)
jg L3x3_3
movw %bp,4(%edx)
movb %ch,2(%edi)
L3x3_3:
cmpw %bp,(%edx,%esi,1)
jg L3x3_4
movw %bp,(%edx,%esi,1)
movb %ch,(%edi,%ebx,1)
L3x3_4:
cmpw %bp,2(%edx,%esi,1)
jg L3x3_5
movw %bp,2(%edx,%esi,1)
movb %ch,1(%edi,%ebx,1)
L3x3_5:
cmpw %bp,4(%edx,%esi,1)
jg L3x3_6
movw %bp,4(%edx,%esi,1)
movb %ch,2(%edi,%ebx,1)
L3x3_6:
cmpw %bp,(%edx,%esi,2)
jg L3x3_7
movw %bp,(%edx,%esi,2)
movb %ch,(%edi,%ebx,2)
L3x3_7:
cmpw %bp,2(%edx,%esi,2)
jg L3x3_8
movw %bp,2(%edx,%esi,2)
movb %ch,1(%edi,%ebx,2)
L3x3_8:
cmpw %bp,4(%edx,%esi,2)
jg L3x3_9
movw %bp,4(%edx,%esi,2)
movb %ch,2(%edi,%ebx,2)
L3x3_9:
popl %esi
jmp LDone
// 4x4
.globl DP_4x4
DP_4x4:
pushl %esi
movl C(screenwidth),%ebx
movl C(d_zrowbytes),%esi
cmpw %bp,(%edx)
jg L4x4_1
movw %bp,(%edx)
movb %ch,(%edi)
L4x4_1:
cmpw %bp,2(%edx)
jg L4x4_2
movw %bp,2(%edx)
movb %ch,1(%edi)
L4x4_2:
cmpw %bp,4(%edx)
jg L4x4_3
movw %bp,4(%edx)
movb %ch,2(%edi)
L4x4_3:
cmpw %bp,6(%edx)
jg L4x4_4
movw %bp,6(%edx)
movb %ch,3(%edi)
L4x4_4:
cmpw %bp,(%edx,%esi,1)
jg L4x4_5
movw %bp,(%edx,%esi,1)
movb %ch,(%edi,%ebx,1)
L4x4_5:
cmpw %bp,2(%edx,%esi,1)
jg L4x4_6
movw %bp,2(%edx,%esi,1)
movb %ch,1(%edi,%ebx,1)
L4x4_6:
cmpw %bp,4(%edx,%esi,1)
jg L4x4_7
movw %bp,4(%edx,%esi,1)
movb %ch,2(%edi,%ebx,1)
L4x4_7:
cmpw %bp,6(%edx,%esi,1)
jg L4x4_8
movw %bp,6(%edx,%esi,1)
movb %ch,3(%edi,%ebx,1)
L4x4_8:
leal (%edx,%esi,2),%edx
leal (%edi,%ebx,2),%edi
cmpw %bp,(%edx)
jg L4x4_9
movw %bp,(%edx)
movb %ch,(%edi)
L4x4_9:
cmpw %bp,2(%edx)
jg L4x4_10
movw %bp,2(%edx)
movb %ch,1(%edi)
L4x4_10:
cmpw %bp,4(%edx)
jg L4x4_11
movw %bp,4(%edx)
movb %ch,2(%edi)
L4x4_11:
cmpw %bp,6(%edx)
jg L4x4_12
movw %bp,6(%edx)
movb %ch,3(%edi)
L4x4_12:
cmpw %bp,(%edx,%esi,1)
jg L4x4_13
movw %bp,(%edx,%esi,1)
movb %ch,(%edi,%ebx,1)
L4x4_13:
cmpw %bp,2(%edx,%esi,1)
jg L4x4_14
movw %bp,2(%edx,%esi,1)
movb %ch,1(%edi,%ebx,1)
L4x4_14:
cmpw %bp,4(%edx,%esi,1)
jg L4x4_15
movw %bp,4(%edx,%esi,1)
movb %ch,2(%edi,%ebx,1)
L4x4_15:
cmpw %bp,6(%edx,%esi,1)
jg L4x4_16
movw %bp,6(%edx,%esi,1)
movb %ch,3(%edi,%ebx,1)
L4x4_16:
popl %esi
jmp LDone
// default case, handling any size particle
LDefault:
// count = pix << d_y_aspect_shift;
movl %eax,%ebx
movl %eax,DP_Pix
movb C(d_y_aspect_shift),%cl
shll %cl,%ebx
// for ( ; count ; count--, pz += d_zwidth, pdest += screenwidth)
// {
// for (i=0 ; i<pix ; i++)
// {
// if (pz[i] <= izi)
// {
// pz[i] = izi;
// pdest[i] = color;
// }
// }
// }
LGenRowLoop:
movl DP_Pix,%eax
LGenColLoop:
cmpw %bp,-2(%edx,%eax,2)
jg LGSkip
movw %bp,-2(%edx,%eax,2)
movb %ch,-1(%edi,%eax,1)
LGSkip:
decl %eax // --pix
jnz LGenColLoop
addl C(d_zrowbytes),%edx
addl C(screenwidth),%edi
decl %ebx // --count
jnz LGenRowLoop
LDone:
popl %ebx // restore register variables
popl %edi
popl %ebp // restore the caller's stack frame
ret
LPop6AndDone:
fstp %st(0)
fstp %st(0)
fstp %st(0)
fstp %st(0)
fstp %st(0)
LPop1AndDone:
fstp %st(0)
jmp LDone
#endif // id386