lxdream 0.9.1| filename | src/pvr2/texcache.c |
| changeset | 886:2bc6d2329cce |
| prev | 870:8d4deb2bc1ea |
| next | 1066:ddffe9d2b332 |
| author | nkeynes |
| date | Mon Jan 26 07:26:24 2009 +0000 (15 years ago) |
| permissions | -rw-r--r-- |
| last change | Add read_byte_for_write mem function for correct implementation of AND.B and friends with TLB enabled. Add read_byte and read_long MMIO stubs to do correct sign extension of IO reads |
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1 /**
2 * $Id$
3 *
4 * Texture cache. Responsible for maintaining a working set of OpenGL
5 * textures.
6 *
7 *
8 * Copyright (c) 2005 Nathan Keynes.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 */
21 #include <assert.h>
22 #include <string.h>
23 #include "pvr2/pvr2.h"
24 #include "pvr2/pvr2mmio.h"
26 /** Specifies the maximum number of OpenGL
27 * textures we're willing to have open at a time. If more are
28 * needed, textures will be evicted in LRU order.
29 */
30 #define MAX_TEXTURES 256
32 /**
33 * Data structure:
34 *
35 * Main operations:
36 * find entry by texture_addr
37 * add new entry
38 * move entry to tail of lru list
39 * remove entry
40 */
42 typedef signed short texcache_entry_index;
43 #define EMPTY_ENTRY -1
45 static texcache_entry_index texcache_free_ptr = 0;
46 static GLuint texcache_free_list[MAX_TEXTURES];
48 typedef struct texcache_entry {
49 uint32_t texture_addr;
50 int width, height, mode;
51 GLuint texture_id;
52 render_buffer_t buffer;
53 texcache_entry_index next;
54 uint32_t lru_count;
55 } *texcache_entry_t;
57 static texcache_entry_index texcache_page_lookup[PVR2_RAM_PAGES];
58 static uint32_t texcache_ref_counter;
59 static struct texcache_entry texcache_active_list[MAX_TEXTURES];
60 static uint32_t texcache_palette_mode;
61 static uint32_t texcache_stride_width;
63 /**
64 * Initialize the texture cache.
65 */
66 void texcache_init( )
67 {
68 int i;
69 for( i=0; i<PVR2_RAM_PAGES; i++ ) {
70 texcache_page_lookup[i] = EMPTY_ENTRY;
71 }
72 for( i=0; i<MAX_TEXTURES; i++ ) {
73 texcache_free_list[i] = i;
74 texcache_active_list[i].texture_addr = -1;
75 texcache_active_list[i].buffer = NULL;
76 texcache_active_list[i].next = EMPTY_ENTRY;
77 }
78 texcache_free_ptr = 0;
79 texcache_ref_counter = 0;
80 texcache_palette_mode = 0;
81 texcache_stride_width = 0;
82 }
84 /**
85 * Setup the initial texture ids (must be called after the GL context is
86 * prepared)
87 */
88 void texcache_gl_init( )
89 {
90 int i;
91 GLuint texids[MAX_TEXTURES];
93 glGenTextures( MAX_TEXTURES, texids );
94 for( i=0; i<MAX_TEXTURES; i++ ) {
95 texcache_active_list[i].texture_id = texids[i];
96 }
97 }
99 void texcache_release_render_buffer( render_buffer_t buffer )
100 {
101 if( !buffer->flushed )
102 pvr2_render_buffer_copy_to_sh4(buffer);
103 pvr2_destroy_render_buffer(buffer);
104 }
106 /**
107 * Flush all textures from the cache, returning them to the free list.
108 */
109 void texcache_flush( )
110 {
111 int i;
112 /* clear structures */
113 for( i=0; i<PVR2_RAM_PAGES; i++ ) {
114 texcache_page_lookup[i] = EMPTY_ENTRY;
115 }
116 for( i=0; i<MAX_TEXTURES; i++ ) {
117 texcache_free_list[i] = i;
118 texcache_active_list[i].next = EMPTY_ENTRY;
119 texcache_active_list[i].texture_addr = -1;
120 if( texcache_active_list[i].buffer != NULL ) {
121 texcache_release_render_buffer(texcache_active_list[i].buffer);
122 texcache_active_list[i].buffer = NULL;
123 }
124 }
125 texcache_free_ptr = 0;
126 texcache_ref_counter = 0;
127 }
129 /**
130 * Flush all textures and delete. The cache will be non-functional until
131 * the next call to texcache_init(). This would typically be done if
132 * switching GL targets.
133 */
134 void texcache_shutdown( )
135 {
136 GLuint texids[MAX_TEXTURES];
137 int i;
138 texcache_flush();
140 for( i=0; i<MAX_TEXTURES; i++ ) {
141 texids[i] = texcache_active_list[i].texture_id;
142 }
143 glDeleteTextures( MAX_TEXTURES, texids );
144 }
146 static void texcache_evict( int slot )
147 {
148 /* Remove the selected slot from the lookup table */
149 assert( texcache_active_list[slot].texture_addr != -1 );
150 uint32_t evict_page = texcache_active_list[slot].texture_addr >> 12;
151 texcache_entry_index replace_next = texcache_active_list[slot].next;
152 texcache_active_list[slot].texture_addr = -1;
153 texcache_active_list[slot].next = EMPTY_ENTRY; /* Just for safety */
154 if( texcache_active_list[slot].buffer != NULL ) {
155 texcache_release_render_buffer(texcache_active_list[slot].buffer);
156 texcache_active_list[slot].buffer = NULL;
157 }
158 if( texcache_page_lookup[evict_page] == slot ) {
159 texcache_page_lookup[evict_page] = replace_next;
160 } else {
161 texcache_entry_index idx = texcache_page_lookup[evict_page];
162 texcache_entry_index next;
163 do {
164 next = texcache_active_list[idx].next;
165 if( next == slot ) {
166 assert( idx != replace_next );
167 texcache_active_list[idx].next = replace_next;
168 break;
169 }
170 idx = next;
171 } while( next != EMPTY_ENTRY );
172 }
173 }
175 /**
176 * Evict a single texture from the cache.
177 * @return the slot of the evicted texture.
178 */
179 static texcache_entry_index texcache_evict_lru( void )
180 {
181 /* Full table scan - take over the entry with the lowest lru value */
182 texcache_entry_index slot = 0;
183 int lru_value = texcache_active_list[0].lru_count;
184 int i;
185 for( i=1; i<MAX_TEXTURES; i++ ) {
186 /* FIXME: account for rollover */
187 if( texcache_active_list[i].lru_count < lru_value ) {
188 slot = i;
189 lru_value = texcache_active_list[i].lru_count;
190 }
191 }
192 texcache_evict(slot);
194 return slot;
195 }
197 /**
198 * Evict all textures contained in the page identified by a texture address.
199 */
200 void texcache_invalidate_page( uint32_t texture_addr ) {
201 uint32_t texture_page = texture_addr >> 12;
202 texcache_entry_index idx = texcache_page_lookup[texture_page];
203 if( idx == EMPTY_ENTRY )
204 return;
205 assert( texcache_free_ptr >= 0 );
206 do {
207 texcache_entry_t entry = &texcache_active_list[idx];
208 entry->texture_addr = -1;
209 if( entry->buffer != NULL ) {
210 texcache_release_render_buffer(entry->buffer);
211 entry->buffer = NULL;
212 }
213 /* release entry */
214 texcache_free_ptr--;
215 texcache_free_list[texcache_free_ptr] = idx;
216 idx = entry->next;
217 entry->next = EMPTY_ENTRY;
218 } while( idx != EMPTY_ENTRY );
219 texcache_page_lookup[texture_page] = EMPTY_ENTRY;
220 }
222 /**
223 * Mark all textures that use the palette table as needing a re-read (ie
224 * for when the palette is changed. We could track exactly which ones are
225 * affected, but it's not clear that the extra maintanence overhead is
226 * worthwhile.
227 */
228 void texcache_invalidate_palette( )
229 {
230 int i;
231 for( i=0; i<MAX_TEXTURES; i++ ) {
232 if( texcache_active_list[i].texture_addr != -1 &&
233 PVR2_TEX_IS_PALETTE(texcache_active_list[i].mode) ) {
234 texcache_evict( i );
235 texcache_free_ptr--;
236 texcache_free_list[texcache_free_ptr] = i;
237 }
238 }
239 }
240 /**
241 * Mark all stride textures as needing a re-read (ie when the stride width
242 * is changed).
243 */
244 void texcache_invalidate_stride( )
245 {
246 int i;
247 for( i=0; i<MAX_TEXTURES; i++ ) {
248 if( texcache_active_list[i].texture_addr != -1 &&
249 PVR2_TEX_IS_STRIDE(texcache_active_list[i].mode) ) {
250 texcache_evict( i );
251 texcache_free_ptr--;
252 texcache_free_list[texcache_free_ptr] = i;
253 }
254 }
255 }
257 void texcache_set_config( uint32_t palette_mode, uint32_t stride )
258 {
259 if( palette_mode != texcache_palette_mode )
260 texcache_invalidate_palette();
261 if( stride != texcache_stride_width )
262 texcache_invalidate_stride();
264 texcache_palette_mode = palette_mode;
265 texcache_stride_width = stride;
266 }
268 static void decode_pal8_to_32( uint32_t *out, uint8_t *in, int inbytes, uint32_t *pal )
269 {
270 int i;
271 for( i=0; i<inbytes; i++ ) {
272 *out++ = pal[*in++];
273 }
274 }
276 static void decode_pal8_to_16( uint16_t *out, uint8_t *in, int inbytes, uint32_t *pal )
277 {
278 int i;
279 for( i=0; i<inbytes; i++ ) {
280 *out++ = (uint16_t)pal[*in++];
281 }
282 }
284 static void decode_pal4_to_32( uint32_t *out, uint8_t *in, int inbytes, uint32_t *pal )
285 {
286 int i;
287 for( i=0; i<inbytes; i++ ) {
288 *out++ = pal[*in & 0x0F];
289 *out++ = pal[(*in >> 4)];
290 in++;
291 }
292 }
295 static void decode_pal4_to_16( uint16_t *out, uint8_t *in, int inbytes, uint32_t *pal )
296 {
297 int i;
298 for( i=0; i<inbytes; i++ ) {
299 *out++ = (uint16_t)pal[*in & 0x0F];
300 *out++ = (uint16_t)pal[(*in >> 4)];
301 in++;
302 }
303 }
305 #define VQ_CODEBOOK_SIZE 2048 /* 256 entries * 4 pixels per quad * 2 byte pixels */
307 struct vq_codebook {
308 uint16_t quad[256][4];
309 };
311 static void vq_get_codebook( struct vq_codebook *codebook,
312 uint16_t *input )
313 {
314 /* Detwiddle the codebook, for the sake of my own sanity if nothing else */
315 uint16_t *p = (uint16_t *)input;
316 int i;
317 for( i=0; i<256; i++ ) {
318 codebook->quad[i][0] = *p++;
319 codebook->quad[i][2] = *p++;
320 codebook->quad[i][1] = *p++;
321 codebook->quad[i][3] = *p++;
322 }
323 }
325 static void vq_decode( uint16_t *output, unsigned char *input, int width, int height,
326 struct vq_codebook *codebook ) {
327 int i,j;
329 uint8_t *c = (uint8_t *)input;
330 for( j=0; j<height; j+=2 ) {
331 for( i=0; i<width; i+=2 ) {
332 uint8_t code = *c++;
333 output[i + j*width] = codebook->quad[code][0];
334 output[i + 1 + j*width] = codebook->quad[code][1];
335 output[i + (j+1)*width] = codebook->quad[code][2];
336 output[i + 1 + (j+1)*width] = codebook->quad[code][3];
337 }
338 }
339 }
341 static inline uint32_t yuv_to_rgb32( float y, float u, float v )
342 {
343 u -= 128;
344 v -= 128;
345 int r = (int)(y + v*1.375);
346 int g = (int)(y - u*0.34375 - v*0.6875);
347 int b = (int)(y + u*1.71875);
348 if( r > 255 ) { r = 255; } else if( r < 0 ) { r = 0; }
349 if( g > 255 ) { g = 255; } else if( g < 0 ) { g = 0; }
350 if( b > 255 ) { b = 255; } else if( b < 0 ) { b = 0; }
351 return 0xFF000000 | (r<<16) | (g<<8) | (b);
352 }
355 /**
356 * Convert raster YUV texture data into RGB32 data - most GL implementations don't
357 * directly support this format unfortunately. The input data is formatted as
358 * 32 bits = 2 horizontal pixels, UYVY. This is currently done rather inefficiently
359 * in floating point.
360 */
361 static void yuv_decode( uint32_t *output, uint32_t *input, int width, int height )
362 {
363 int x, y;
364 uint32_t *p = input;
365 for( y=0; y<height; y++ ) {
366 for( x=0; x<width; x+=2 ) {
367 float u = (float)(*p & 0xFF);
368 float y0 = (float)( (*p>>8)&0xFF );
369 float v = (float)( (*p>>16)&0xFF );
370 float y1 = (float)( (*p>>24)&0xFF );
371 *output++ = yuv_to_rgb32( y0, u, v );
372 *output++ = yuv_to_rgb32( y1, u, v );
373 p++;
374 }
375 }
376 }
378 static gboolean is_npot_texture( int width )
379 {
380 while( width != 0 ) {
381 if( width & 1 )
382 return width != 1;
383 width >>= 1;
384 }
385 return TRUE;
386 }
388 /**
389 * Load texture data from the given address and parameters into the currently
390 * bound OpenGL texture.
391 */
392 static void texcache_load_texture( uint32_t texture_addr, int width, int height,
393 int mode ) {
394 int bpp_shift = 1; /* bytes per (output) pixel as a power of 2 */
395 GLint intFormat = GL_RGBA, format, type;
396 int tex_format = mode & PVR2_TEX_FORMAT_MASK;
397 struct vq_codebook codebook;
398 GLint filter = GL_LINEAR;
400 glPixelStorei( GL_UNPACK_ROW_LENGTH, 0 );
402 /* Decode the format parameters */
403 switch( tex_format ) {
404 case PVR2_TEX_FORMAT_IDX4:
405 case PVR2_TEX_FORMAT_IDX8:
406 /* For indexed-colour modes, we need to lookup the palette control
407 * word to determine the de-indexed texture format.
408 */
409 switch( texcache_palette_mode ) {
410 case 0: /* ARGB1555 */
411 format = GL_BGRA;
412 type = GL_UNSIGNED_SHORT_1_5_5_5_REV;
413 break;
414 case 1: /* RGB565 */
415 intFormat = GL_RGB;
416 format = GL_RGB;
417 type = GL_UNSIGNED_SHORT_5_6_5;
418 break;
419 case 2: /* ARGB4444 */
420 format = GL_BGRA;
421 type = GL_UNSIGNED_SHORT_4_4_4_4_REV;
422 break;
423 case 3: /* ARGB8888 */
424 format = GL_BGRA;
425 type = GL_UNSIGNED_BYTE;
426 bpp_shift = 2;
427 break;
428 default:
429 return; /* Can't happen, but it makes gcc stop complaining */
430 }
431 break;
433 default:
434 case PVR2_TEX_FORMAT_ARGB1555:
435 format = GL_BGRA;
436 type = GL_UNSIGNED_SHORT_1_5_5_5_REV;
437 break;
438 case PVR2_TEX_FORMAT_RGB565:
439 intFormat = GL_RGB;
440 format = GL_RGB;
441 type = GL_UNSIGNED_SHORT_5_6_5;
442 break;
443 case PVR2_TEX_FORMAT_ARGB4444:
444 format = GL_BGRA;
445 type = GL_UNSIGNED_SHORT_4_4_4_4_REV;
446 break;
447 case PVR2_TEX_FORMAT_YUV422:
448 /* YUV422 isn't directly supported by most implementations, so decode
449 * it to a (reasonably) standard ARGB32.
450 */
451 bpp_shift = 2;
452 format = GL_BGRA;
453 type = GL_UNSIGNED_BYTE;
454 break;
455 case PVR2_TEX_FORMAT_BUMPMAP:
456 WARN( "Bumpmap not supported" );
457 return;
458 }
460 if( PVR2_TEX_IS_STRIDE(mode) && tex_format != PVR2_TEX_FORMAT_IDX4 &&
461 tex_format != PVR2_TEX_FORMAT_IDX8 ) {
462 /* Stride textures cannot be mip-mapped, compressed, indexed or twiddled */
463 unsigned char data[(width*height) << bpp_shift];
464 if( tex_format == PVR2_TEX_FORMAT_YUV422 ) {
465 unsigned char tmp[(width*height)<<1];
466 pvr2_vram64_read_stride( tmp, width<<1, texture_addr, texcache_stride_width<<1, height );
467 yuv_decode( (uint32_t *)data, (uint32_t *)tmp, width, height );
468 } else {
469 pvr2_vram64_read_stride( data, width<<bpp_shift, texture_addr, texcache_stride_width<<bpp_shift, height );
470 }
471 glTexImage2D( GL_TEXTURE_2D, 0, intFormat, width, height, 0, format, type, data );
472 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter);
473 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
474 return;
475 }
477 if( PVR2_TEX_IS_COMPRESSED(mode) ) {
478 uint16_t tmp[VQ_CODEBOOK_SIZE];
479 pvr2_vram64_read( (unsigned char *)tmp, texture_addr, VQ_CODEBOOK_SIZE );
480 texture_addr += VQ_CODEBOOK_SIZE;
481 vq_get_codebook( &codebook, tmp );
482 }
484 int level=0, last_level = 0, mip_width = width, mip_height = height, src_bytes, dest_bytes;
485 if( PVR2_TEX_IS_MIPMAPPED(mode) ) {
486 uint32_t src_offset = 0;
487 filter = GL_LINEAR_MIPMAP_LINEAR;
488 mip_height = height = width;
489 while( (1<<last_level) < width ) {
490 last_level++;
491 src_offset += ((width>>last_level)*(width>>last_level));
492 }
493 if( width != 1 ) {
494 src_offset += 3;
495 }
496 if( PVR2_TEX_IS_COMPRESSED(mode) ) {
497 src_offset >>= 2;
498 } else if( tex_format == PVR2_TEX_FORMAT_IDX4 ) {
499 src_offset >>= 1;
500 } else if( tex_format == PVR2_TEX_FORMAT_YUV422 ) {
501 src_offset <<= 1;
502 } else if( tex_format != PVR2_TEX_FORMAT_IDX8 ) {
503 src_offset <<= bpp_shift;
504 }
505 texture_addr += src_offset;
506 }
509 dest_bytes = (mip_width * mip_height) << bpp_shift;
510 src_bytes = dest_bytes; // Modes will change this (below)
512 for( level=0; level<= last_level; level++ ) {
513 unsigned char data[dest_bytes];
514 /* load data from image, detwiddling/uncompressing as required */
515 if( tex_format == PVR2_TEX_FORMAT_IDX8 ) {
516 src_bytes = (mip_width * mip_height);
517 int bank = (mode >> 25) &0x03;
518 uint32_t *palette = ((uint32_t *)mmio_region_PVR2PAL.mem) + (bank<<8);
519 unsigned char tmp[src_bytes];
520 pvr2_vram64_read_twiddled_8( tmp, texture_addr, mip_width, mip_height );
521 if( bpp_shift == 2 ) {
522 decode_pal8_to_32( (uint32_t *)data, tmp, src_bytes, palette );
523 } else {
524 decode_pal8_to_16( (uint16_t *)data, tmp, src_bytes, palette );
525 }
526 } else if( tex_format == PVR2_TEX_FORMAT_IDX4 ) {
527 src_bytes = (mip_width * mip_height) >> 1;
528 int bank = (mode >>21 ) & 0x3F;
529 uint32_t *palette = ((uint32_t *)mmio_region_PVR2PAL.mem) + (bank<<4);
530 unsigned char tmp[src_bytes];
531 pvr2_vram64_read_twiddled_4( tmp, texture_addr, mip_width, mip_height );
532 if( bpp_shift == 2 ) {
533 decode_pal4_to_32( (uint32_t *)data, tmp, src_bytes, palette );
534 } else {
535 decode_pal4_to_16( (uint16_t *)data, tmp, src_bytes, palette );
536 }
537 } else if( tex_format == PVR2_TEX_FORMAT_YUV422 ) {
538 src_bytes = ((mip_width*mip_height)<<1);
539 unsigned char tmp[src_bytes];
540 if( PVR2_TEX_IS_TWIDDLED(mode) ) {
541 pvr2_vram64_read_twiddled_16( tmp, texture_addr, mip_width, mip_height );
542 } else {
543 pvr2_vram64_read( tmp, texture_addr, src_bytes );
544 }
545 yuv_decode( (uint32_t *)data, (uint32_t *)tmp, mip_width, mip_height );
546 } else if( PVR2_TEX_IS_COMPRESSED(mode) ) {
547 src_bytes = ((mip_width*mip_height) >> 2);
548 unsigned char tmp[src_bytes];
549 if( PVR2_TEX_IS_TWIDDLED(mode) ) {
550 pvr2_vram64_read_twiddled_8( tmp, texture_addr, mip_width>>1, mip_height>>1 );
551 } else {
552 pvr2_vram64_read( tmp, texture_addr, src_bytes );
553 }
554 vq_decode( (uint16_t *)data, tmp, mip_width, mip_height, &codebook );
555 } else if( PVR2_TEX_IS_TWIDDLED(mode) ) {
556 pvr2_vram64_read_twiddled_16( data, texture_addr, mip_width, mip_height );
557 } else {
558 pvr2_vram64_read( data, texture_addr, src_bytes );
559 }
561 /* Pass to GL */
562 if( level == last_level && level != 0 ) { /* 1x1 stored within a 2x2 */
563 glTexImage2D( GL_TEXTURE_2D, level, intFormat, 1, 1, 0, format, type,
564 data + (3 << bpp_shift) );
565 } else {
566 glTexImage2D( GL_TEXTURE_2D, level, intFormat, mip_width, mip_height, 0, format, type,
567 data );
568 if( mip_width > 2 ) {
569 mip_width >>= 1;
570 mip_height >>= 1;
571 dest_bytes >>= 2;
572 src_bytes >>= 2;
573 }
574 texture_addr -= src_bytes;
575 }
576 }
578 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter);
579 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
580 }
582 static int texcache_find_texture_slot( uint32_t texture_word, int width, int height )
583 {
584 uint32_t texture_addr = (texture_word & 0x000FFFFF)<<3;
585 uint32_t texture_page = texture_addr >> 12;
586 texcache_entry_index next;
587 texcache_entry_index idx = texcache_page_lookup[texture_page];
588 while( idx != EMPTY_ENTRY ) {
589 texcache_entry_t entry = &texcache_active_list[idx];
590 if( entry->texture_addr == texture_addr &&
591 entry->mode == texture_word &&
592 entry->width == width &&
593 entry->height == height ) {
594 entry->lru_count = texcache_ref_counter++;
595 return idx;
596 }
597 idx = entry->next;
598 }
599 return -1;
600 }
602 static int texcache_alloc_texture_slot( uint32_t texture_word, int width, int height )
603 {
604 uint32_t texture_addr = (texture_word & 0x000FFFFF)<<3;
605 uint32_t texture_page = texture_addr >> 12;
606 texcache_entry_index slot = 0;
608 if( texcache_free_ptr < MAX_TEXTURES ) {
609 slot = texcache_free_list[texcache_free_ptr++];
610 } else {
611 slot = texcache_evict_lru();
612 }
614 /* Construct new entry */
615 assert( texcache_active_list[slot].texture_addr == -1 );
616 texcache_active_list[slot].texture_addr = texture_addr;
617 texcache_active_list[slot].width = width;
618 texcache_active_list[slot].height = height;
619 texcache_active_list[slot].mode = texture_word;
620 texcache_active_list[slot].lru_count = texcache_ref_counter++;
622 /* Add entry to the lookup table */
623 int next = texcache_page_lookup[texture_page];
624 if( next == slot ) {
625 int i;
626 fprintf( stderr, "Active list: " );
627 for( i=0; i<MAX_TEXTURES; i++ ) {
628 fprintf( stderr, "%d, ", texcache_active_list[i].next );
629 }
630 fprintf( stderr, "\n" );
631 assert( next != slot );
633 }
634 texcache_active_list[slot].next = next;
635 texcache_page_lookup[texture_page] = slot;
636 return slot;
637 }
639 /**
640 * Return a texture ID for the texture specified at the supplied address
641 * and given parameters (the same sequence of bytes could in theory have
642 * multiple interpretations). We use the texture address as the primary
643 * index, but allow for multiple instances at each address. The texture
644 * will be bound to the GL_TEXTURE_2D target before being returned.
645 *
646 * If the texture has already been bound, return the ID to which it was
647 * bound. Otherwise obtain an unused texture ID and set it up appropriately.
648 */
649 GLuint texcache_get_texture( uint32_t texture_word, int width, int height )
650 {
651 int slot = texcache_find_texture_slot( texture_word, width, height );
653 if( slot == -1 ) {
654 /* Not found - check the free list */
655 slot = texcache_alloc_texture_slot( texture_word, width, height );
657 /* Construct the GL texture */
658 uint32_t texture_addr = (texture_word & 0x000FFFFF)<<3;
659 glBindTexture( GL_TEXTURE_2D, texcache_active_list[slot].texture_id );
660 texcache_load_texture( texture_addr, width, height, texture_word );
661 }
663 return texcache_active_list[slot].texture_id;
664 }
666 render_buffer_t texcache_get_render_buffer( uint32_t texture_addr, int mode, int width, int height )
667 {
668 INFO( "Rendering to texture!" );
669 uint32_t texture_word = ((texture_addr >> 3) & 0x000FFFFF) | PVR2_TEX_UNTWIDDLED;
670 switch( mode ) {
671 case COLFMT_BGRA1555: texture_word |= PVR2_TEX_FORMAT_ARGB1555; break;
672 case COLFMT_RGB565: texture_word |= PVR2_TEX_FORMAT_RGB565; break;
673 case COLFMT_BGRA4444: texture_word |= PVR2_TEX_FORMAT_ARGB4444; break;
674 default:
675 WARN( "Rendering to non-texture colour format" );
676 }
677 if( is_npot_texture(width) )
678 texture_word |= PVR2_TEX_STRIDE;
681 int slot = texcache_find_texture_slot( texture_word, width, height );
682 if( slot == -1 ) {
683 slot = texcache_alloc_texture_slot( texture_word, width, height );
684 }
686 texcache_entry_t entry = &texcache_active_list[slot];
688 if( entry->buffer == NULL ) {
689 entry->buffer = pvr2_create_render_buffer( texture_addr, width, height, entry->texture_id );
690 } else if( entry->buffer->width != width || entry->buffer->height != height ) {
691 texcache_release_render_buffer(entry->buffer);
692 entry->buffer = pvr2_create_render_buffer( texture_addr, width, height, entry->texture_id );
693 }
695 return entry->buffer;
696 }
698 /**
699 * Check the integrity of the texcache. Verifies that every cache slot
700 * appears exactly once on either the free list or one page list. For
701 * active slots, the texture address must also match the page it appears on.
702 *
703 */
704 void texcache_integrity_check()
705 {
706 int i;
707 int slot_found[MAX_TEXTURES];
709 memset( slot_found, 0, sizeof(slot_found) );
711 /* Check entries on the free list */
712 for( i= texcache_free_ptr; i< MAX_TEXTURES; i++ ) {
713 int slot = texcache_free_list[i];
714 assert( slot_found[slot] == 0 );
715 assert( texcache_active_list[slot].next == EMPTY_ENTRY );
716 slot_found[slot] = 1;
717 }
719 /* Check entries on the active lists */
720 for( i=0; i< PVR2_RAM_PAGES; i++ ) {
721 int slot = texcache_page_lookup[i];
722 while( slot != EMPTY_ENTRY ) {
723 assert( slot_found[slot] == 0 );
724 assert( (texcache_active_list[slot].texture_addr >> 12) == i );
725 slot_found[slot] = 2;
726 slot = texcache_active_list[slot].next;
727 }
728 }
730 /* Make sure we didn't miss any entries */
731 for( i=0; i<MAX_TEXTURES; i++ ) {
732 assert( slot_found[i] != 0 );
733 }
734 }
.