Search
lxdream.org :: lxdream/src/pvr2/texcache.c
lxdream 0.9.1
released Jun 29
Download Now
filename src/pvr2/texcache.c
changeset 1210:79bbd30363f4
prev1165:13406c35849b
next1221:f50407acc682
author nkeynes
date Tue Feb 07 14:27:13 2012 +1000 (9 years ago)
permissions -rw-r--r--
last change Add wrangling for some of the core vs EXT/ARB versions of functions + macros
view annotate diff log raw
     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"
    25 #include "pvr2/glutil.h"
    27 /** Specifies the maximum number of OpenGL
    28  * textures we're willing to have open at a time. If more are
    29  * needed, textures will be evicted in LRU order.
    30  */
    31 #define MAX_TEXTURES 256
    33 /**
    34  * Data structure:
    35  *
    36  * Main operations:
    37  *    find entry by texture_addr
    38  *    add new entry
    39  *    move entry to tail of lru list
    40  *    remove entry
    41  */
    43 typedef signed short texcache_entry_index;
    44 #define EMPTY_ENTRY -1
    46 static texcache_entry_index texcache_free_ptr = 0;
    47 static GLuint texcache_free_list[MAX_TEXTURES];
    49 typedef struct texcache_entry {
    50     uint32_t texture_addr;
    51     uint32_t poly2_mode, tex_mode;
    52     GLuint texture_id;
    53     render_buffer_t buffer;
    54     texcache_entry_index next;
    55     uint32_t lru_count;
    56 } *texcache_entry_t;
    58 static texcache_entry_index texcache_page_lookup[PVR2_RAM_PAGES];
    59 static uint32_t texcache_ref_counter;
    60 static struct texcache_entry texcache_active_list[MAX_TEXTURES];
    61 static uint32_t texcache_palette_mode;
    62 static uint32_t texcache_stride_width;
    63 static gboolean texcache_have_palette_shader;
    64 static gboolean texcache_palette_valid;
    65 static GLuint texcache_palette_texid;
    67 /**
    68  * Initialize the texture cache.
    69  */
    70 void texcache_init( )
    71 {
    72     int i;
    73     for( i=0; i<PVR2_RAM_PAGES; i++ ) {
    74         texcache_page_lookup[i] = EMPTY_ENTRY;
    75     }
    76     for( i=0; i<MAX_TEXTURES; i++ ) {
    77         texcache_free_list[i] = i;
    78         texcache_active_list[i].texture_addr = -1;
    79         texcache_active_list[i].buffer = NULL;
    80         texcache_active_list[i].next = EMPTY_ENTRY;
    81     }
    82     texcache_free_ptr = 0;
    83     texcache_ref_counter = 0;
    84     texcache_palette_mode = -1;
    85     texcache_stride_width = 0;
    86 }
    88 /**
    89  * Setup the initial texture ids (must be called after the GL context is
    90  * prepared)
    91  */
    92 void texcache_gl_init( )
    93 {
    94     int i;
    95     GLuint texids[MAX_TEXTURES];
    97     if( glsl_is_supported() && isGLMultitextureSupported() ) {
    98         texcache_have_palette_shader = TRUE;
    99         texcache_palette_valid = FALSE;
   100         glGenTextures(1, &texcache_palette_texid );
   102         /* Bind the texture and set the params */
   103         glActiveTexture(GL_TEXTURE1);
   104         glBindTexture(GL_TEXTURE_1D, texcache_palette_texid);
   105         glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
   106         glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
   107         glTexParameteri( GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_CLAMP );
   108         glActiveTexture(GL_TEXTURE0);
   110     } else {
   111         texcache_have_palette_shader = FALSE;
   112     }
   114     glGenTextures( MAX_TEXTURES, texids );
   115     for( i=0; i<MAX_TEXTURES; i++ ) {
   116         texcache_active_list[i].texture_id = texids[i];
   117     }
   118 }
   120 void texcache_release_render_buffer( render_buffer_t buffer )
   121 {
   122     if( !buffer->flushed ) 
   123         pvr2_render_buffer_copy_to_sh4(buffer);
   124     pvr2_destroy_render_buffer(buffer);
   125 }
   127 /**
   128  * Flush all textures from the cache, returning them to the free list.
   129  */
   130 void texcache_flush( )
   131 {
   132     int i;
   133     /* clear structures */
   134     for( i=0; i<PVR2_RAM_PAGES; i++ ) {
   135         texcache_page_lookup[i] = EMPTY_ENTRY;
   136     }
   137     for( i=0; i<MAX_TEXTURES; i++ ) {
   138         texcache_free_list[i] = i;
   139         texcache_active_list[i].next = EMPTY_ENTRY;
   140         texcache_active_list[i].texture_addr = -1;
   141         if( texcache_active_list[i].buffer != NULL ) {
   142             texcache_release_render_buffer(texcache_active_list[i].buffer);
   143             texcache_active_list[i].buffer = NULL;
   144         }
   145     }
   146     texcache_free_ptr = 0;
   147     texcache_ref_counter = 0;
   148 }
   150 /**
   151  * Flush all textures and delete. The cache will be non-functional until
   152  * the next call to texcache_init(). This would typically be done if
   153  * switching GL targets.
   154  */    
   155 void texcache_shutdown( )
   156 {
   157     GLuint texids[MAX_TEXTURES];
   158     int i;
   159     texcache_flush();
   161     if( texcache_have_palette_shader )
   162         glDeleteTextures( 1, &texcache_palette_texid );
   164     for( i=0; i<MAX_TEXTURES; i++ ) {
   165         texids[i] = texcache_active_list[i].texture_id;
   166     }
   167     glDeleteTextures( MAX_TEXTURES, texids );
   168 }
   170 static void texcache_evict( int slot )
   171 {
   172     /* Remove the selected slot from the lookup table */
   173     assert( texcache_active_list[slot].texture_addr != -1 );
   174     uint32_t evict_page = texcache_active_list[slot].texture_addr >> 12;
   175     texcache_entry_index replace_next = texcache_active_list[slot].next;
   176     texcache_active_list[slot].texture_addr = -1;
   177     texcache_active_list[slot].next = EMPTY_ENTRY; /* Just for safety */
   178     if( texcache_active_list[slot].buffer != NULL ) {
   179         texcache_release_render_buffer(texcache_active_list[slot].buffer);
   180         texcache_active_list[slot].buffer = NULL;
   181     }
   182     if( texcache_page_lookup[evict_page] == slot ) {
   183         texcache_page_lookup[evict_page] = replace_next;
   184     } else {
   185         texcache_entry_index idx = texcache_page_lookup[evict_page];
   186         texcache_entry_index next;
   187         do {
   188             next = texcache_active_list[idx].next;
   189             if( next == slot ) {
   190                 assert( idx != replace_next );
   191                 texcache_active_list[idx].next = replace_next;
   192                 break;
   193             }
   194             idx = next;
   195         } while( next != EMPTY_ENTRY );
   196     }
   197 }
   199 /**
   200  * Evict a single texture from the cache.
   201  * @return the slot of the evicted texture.
   202  */
   203 static texcache_entry_index texcache_evict_lru( void )
   204 {
   205     /* Full table scan - take over the entry with the lowest lru value */
   206     texcache_entry_index slot = 0;
   207     int lru_value = texcache_active_list[0].lru_count;
   208     int i;
   209     for( i=1; i<MAX_TEXTURES; i++ ) {
   210         /* FIXME: account for rollover */
   211         if( texcache_active_list[i].lru_count < lru_value ) {
   212             slot = i;
   213             lru_value = texcache_active_list[i].lru_count;
   214         }
   215     }
   216     texcache_evict(slot);
   218     return slot;
   219 }
   221 /**
   222  * Evict all textures contained in the page identified by a texture address.
   223  */
   224 void texcache_invalidate_page( uint32_t texture_addr ) {
   225     uint32_t texture_page = texture_addr >> 12;
   226     texcache_entry_index idx = texcache_page_lookup[texture_page];
   227     if( idx == EMPTY_ENTRY )
   228         return;
   229     assert( texcache_free_ptr >= 0 );
   230     do {
   231         texcache_entry_t entry = &texcache_active_list[idx];
   232         entry->texture_addr = -1;
   233         if( entry->buffer != NULL ) {
   234             texcache_release_render_buffer(entry->buffer);
   235             entry->buffer = NULL;
   236         }
   237         /* release entry */
   238         texcache_free_ptr--;
   239         texcache_free_list[texcache_free_ptr] = idx;
   240         idx = entry->next;
   241         entry->next = EMPTY_ENTRY;
   242     } while( idx != EMPTY_ENTRY );
   243     texcache_page_lookup[texture_page] = EMPTY_ENTRY;
   244 }
   246 /**
   247  * Load the palette into 4 textures of 256 entries each. This mirrors the
   248  * banking done by the PVR2 for 8-bit textures, and also ensures that we
   249  * can use 8-bit paletted textures ourselves.
   250  */
   251 static void texcache_load_palette_texture( gboolean format_changed )
   252 {
   253     GLint format, type, intFormat = GL_RGBA;
   254     unsigned i;
   255     int bpp = 2;
   256     uint32_t *palette = (uint32_t *)mmio_region_PVR2PAL.mem;
   257     uint16_t packed_palette[1024];
   258     char *data = (char *)palette;
   260     switch( texcache_palette_mode ) {
   261     case 0: /* ARGB1555 */
   262         format = GL_BGRA;
   263         type = GL_UNSIGNED_SHORT_1_5_5_5_REV;
   264         break;
   265     case 1:  /* RGB565 */
   266         intFormat = GL_RGB;
   267         format = GL_RGB;
   268         type = GL_UNSIGNED_SHORT_5_6_5;
   269         break;
   270     case 2: /* ARGB4444 */
   271         format = GL_BGRA;
   272         type = GL_UNSIGNED_SHORT_4_4_4_4_REV;
   273         break;
   274     case 3: /* ARGB8888 */
   275         format = GL_BGRA;
   276         type = GL_UNSIGNED_BYTE;
   277         bpp = 4;
   278         break;
   279     default:
   280         break; /* Can't happen */
   281     }
   284     if( bpp == 2 ) {
   285         for( i=0; i<1024; i++ ) {
   286             packed_palette[i] = (uint16_t)palette[i];
   287         }
   288         data = (char *)packed_palette;
   290     }
   292     glActiveTexture(GL_TEXTURE1);
   293 //    glBindTexture(GL_TEXTURE_1D, texcache_palette_texid);
   294     if( format_changed )
   295         glTexImage1D(GL_TEXTURE_1D, 0, intFormat, 1024, 0, format, type, data );
   296     else
   297         glTexSubImage1D(GL_TEXTURE_1D, 0, 0, 1024, format, type, data);
   298 //    glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
   299 //    glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
   300 //    glTexParameteri( GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_CLAMP );
   301     glActiveTexture(GL_TEXTURE0);
   302     texcache_palette_valid = TRUE;
   303 }
   306 /**
   307  * Mark the palette as having changed. If we have palette support (via shaders)
   308  * we just flag the palette, otherwise we have to invalidate all palette
   309  * textures.
   310  */
   311 void texcache_invalidate_palette( )
   312 {
   313     if( texcache_have_palette_shader ) {
   314         texcache_palette_valid = FALSE;
   315     } else {
   316         int i;
   317         for( i=0; i<MAX_TEXTURES; i++ ) {
   318             if( texcache_active_list[i].texture_addr != -1 &&
   319                     PVR2_TEX_IS_PALETTE(texcache_active_list[i].tex_mode) ) {
   320                 texcache_evict( i );
   321                 texcache_free_ptr--;
   322                 texcache_free_list[texcache_free_ptr] = i;
   323             }
   324         }
   325     }
   326 }
   327 /**
   328  * Mark all stride textures as needing a re-read (ie when the stride width
   329  * is changed).
   330  */
   331 void texcache_invalidate_stride( )
   332 {
   333     int i;
   334     for( i=0; i<MAX_TEXTURES; i++ ) {
   335         if( texcache_active_list[i].texture_addr != -1 &&
   336                 PVR2_TEX_IS_STRIDE(texcache_active_list[i].tex_mode) ) {
   337             texcache_evict( i );
   338             texcache_free_ptr--;
   339             texcache_free_list[texcache_free_ptr] = i;
   340         }
   341     }
   342 }
   344 void texcache_begin_scene( uint32_t palette_mode, uint32_t stride )
   345 {
   346     gboolean format_changed = FALSE;
   347     if( palette_mode != texcache_palette_mode ) {
   348         texcache_invalidate_palette();
   349         format_changed = TRUE;
   350     }
   351     if( stride != texcache_stride_width )
   352         texcache_invalidate_stride();
   354     texcache_palette_mode = palette_mode;
   355     texcache_stride_width = stride;
   357     if( !texcache_palette_valid && texcache_have_palette_shader )
   358         texcache_load_palette_texture(format_changed);
   359 }
   361 static void decode_pal8_to_32( uint32_t *out, uint8_t *in, int inbytes, uint32_t *pal )
   362 {
   363     int i;
   364     for( i=0; i<inbytes; i++ ) {
   365         *out++ = pal[*in++];
   366     }
   367 }
   369 static void decode_pal8_to_16( uint16_t *out, uint8_t *in, int inbytes, uint32_t *pal )
   370 {
   371     int i;
   372     for( i=0; i<inbytes; i++ ) {
   373         *out++ = (uint16_t)pal[*in++];
   374     }
   375 }
   377 static void decode_pal4_to_32( uint32_t *out, uint8_t *in, int inbytes, uint32_t *pal )
   378 {
   379     int i;
   380     for( i=0; i<inbytes; i++ ) {
   381         *out++ = pal[*in & 0x0F];
   382         *out++ = pal[(*in >> 4)];
   383         in++;
   384     }
   385 }
   387 static void decode_pal4_to_pal8( uint8_t *out, uint8_t *in, int inbytes )
   388 {
   389     int i;
   390     for( i=0; i<inbytes; i++ ) {
   391         *out++ = (uint8_t)(*in & 0x0F);
   392         *out++ = (uint8_t)(*in >> 4);
   393         in++;
   394     }
   395 }
   399 static void decode_pal4_to_16( uint16_t *out, uint8_t *in, int inbytes, uint32_t *pal )
   400 {
   401     int i;
   402     for( i=0; i<inbytes; i++ ) {
   403         *out++ = (uint16_t)pal[*in & 0x0F];
   404         *out++ = (uint16_t)pal[(*in >> 4)];
   405         in++;
   406     }
   407 }
   409 #define VQ_CODEBOOK_SIZE 2048 /* 256 entries * 4 pixels per quad * 2 byte pixels */
   411 struct vq_codebook {
   412     uint16_t quad[256][4];
   413 };
   415 static void vq_get_codebook( struct vq_codebook *codebook, 
   416                              uint16_t *input )
   417 {
   418     /* Detwiddle the codebook, for the sake of my own sanity if nothing else */
   419     uint16_t *p = (uint16_t *)input;
   420     int i;
   421     for( i=0; i<256; i++ ) {
   422         codebook->quad[i][0] = *p++;
   423         codebook->quad[i][2] = *p++;
   424         codebook->quad[i][1] = *p++;
   425         codebook->quad[i][3] = *p++;
   426     }
   427 }    
   429 static void vq_decode( uint16_t *output, unsigned char *input, int width, int height, 
   430                        struct vq_codebook *codebook ) {
   431     int i,j;
   433     uint8_t *c = (uint8_t *)input;
   434     for( j=0; j<height; j+=2 ) {
   435         for( i=0; i<width; i+=2 ) {
   436             uint8_t code = *c++;
   437             output[i + j*width] = codebook->quad[code][0];
   438             output[i + 1 + j*width] = codebook->quad[code][1];
   439             output[i + (j+1)*width] = codebook->quad[code][2];
   440             output[i + 1 + (j+1)*width] = codebook->quad[code][3];
   441         }
   442     }
   443 }
   445 static inline uint32_t yuv_to_rgb32( float y, float u, float v )
   446 {
   447     u -= 128;
   448     v -= 128;
   449     int r = (int)(y + v*1.375);
   450     int g = (int)(y - u*0.34375 - v*0.6875);
   451     int b = (int)(y + u*1.71875);
   452     if( r > 255 ) { r = 255; } else if( r < 0 ) { r = 0; }
   453     if( g > 255 ) { g = 255; } else if( g < 0 ) { g = 0; }
   454     if( b > 255 ) { b = 255; } else if( b < 0 ) { b = 0; }
   455     return 0xFF000000 | (r<<16) | (g<<8) | (b);
   456 }
   459 /**
   460  * Convert raster YUV texture data into RGB32 data - most GL implementations don't
   461  * directly support this format unfortunately. The input data is formatted as
   462  * 32 bits = 2 horizontal pixels, UYVY. This is currently done rather inefficiently
   463  * in floating point.
   464  */
   465 static void yuv_decode( uint32_t *output, uint32_t *input, int width, int height )
   466 {
   467     int x, y;
   468     uint32_t *p = input;
   469     for( y=0; y<height; y++ ) {
   470         for( x=0; x<width; x+=2 ) {
   471             float u = (float)(*p & 0xFF);
   472             float y0 = (float)( (*p>>8)&0xFF );
   473             float v = (float)( (*p>>16)&0xFF );
   474             float y1 = (float)( (*p>>24)&0xFF );
   475             *output++ = yuv_to_rgb32( y0, u, v ); 
   476             *output++ = yuv_to_rgb32( y1, u, v );
   477             p++;
   478         }
   479     }
   480 }
   482 static gboolean is_npot_texture( int width )
   483 {
   484     while( width != 0 ) {
   485         if( width & 1 ) 
   486             return width != 1;
   487         width >>= 1;
   488     }
   489     return TRUE;
   490 }
   492 /**
   493  * Load texture data from the given address and parameters into the currently
   494  * bound OpenGL texture.
   495  */
   496 static void texcache_load_texture( uint32_t texture_addr, int width, int height,
   497                                    int mode ) {
   498     int bpp_shift = 1; /* bytes per (output) pixel as a power of 2 */
   499     GLint intFormat = GL_RGBA, format, type;
   500     int tex_format = mode & PVR2_TEX_FORMAT_MASK;
   501     struct vq_codebook codebook;
   502     GLint min_filter = GL_LINEAR;
   503     GLint max_filter = GL_LINEAR;
   504     GLint mipmapfilter = GL_LINEAR_MIPMAP_LINEAR;
   506     glPixelStorei( GL_UNPACK_ROW_LENGTH, 0 );
   508     /* Decode the format parameters */
   509     switch( tex_format ) {
   510     case PVR2_TEX_FORMAT_IDX4:
   511     case PVR2_TEX_FORMAT_IDX8:
   512         if( texcache_have_palette_shader ) {
   513             intFormat = GL_ALPHA8;
   514             format = GL_ALPHA;
   515             type = GL_UNSIGNED_BYTE;
   516             bpp_shift = 0;
   517             min_filter = max_filter = GL_NEAREST;
   518             mipmapfilter = GL_NEAREST_MIPMAP_NEAREST;
   519         } else {
   520             /* For indexed-colour modes, we need to lookup the palette control
   521              * word to determine the de-indexed texture format.
   522              */
   523             switch( texcache_palette_mode ) {
   524             case 0: /* ARGB1555 */
   525                 format = GL_BGRA;
   526                 type = GL_UNSIGNED_SHORT_1_5_5_5_REV;
   527                 break;
   528             case 1:  /* RGB565 */
   529                 intFormat = GL_RGB;
   530                 format = GL_RGB;
   531                 type = GL_UNSIGNED_SHORT_5_6_5;
   532                 break;
   533             case 2: /* ARGB4444 */
   534                 format = GL_BGRA;
   535                 type = GL_UNSIGNED_SHORT_4_4_4_4_REV;
   536                 break;
   537             case 3: /* ARGB8888 */
   538                 format = GL_BGRA;
   539                 type = GL_UNSIGNED_BYTE;
   540                 bpp_shift = 2;
   541                 break;
   542             default:
   543                 return; /* Can't happen, but it makes gcc stop complaining */
   544             }
   545         }
   546         break;
   548         default:
   549         case PVR2_TEX_FORMAT_ARGB1555:
   550             format = GL_BGRA;
   551             type = GL_UNSIGNED_SHORT_1_5_5_5_REV;
   552             break;
   553         case PVR2_TEX_FORMAT_RGB565:
   554             intFormat = GL_RGB;
   555             format = GL_RGB;
   556             type = GL_UNSIGNED_SHORT_5_6_5;
   557             break;
   558         case PVR2_TEX_FORMAT_ARGB4444:
   559             format = GL_BGRA;
   560             type = GL_UNSIGNED_SHORT_4_4_4_4_REV;
   561             break;
   562         case PVR2_TEX_FORMAT_YUV422:
   563             /* YUV422 isn't directly supported by most implementations, so decode
   564              * it to a (reasonably) standard ARGB32.
   565              */
   566             bpp_shift = 2;
   567             format = GL_BGRA;
   568             type = GL_UNSIGNED_BYTE;
   569             break;
   570         case PVR2_TEX_FORMAT_BUMPMAP:
   571             WARN( "Bumpmap not supported" );
   572             return;
   573     }
   575     if( PVR2_TEX_IS_STRIDE(mode) && tex_format != PVR2_TEX_FORMAT_IDX4 &&
   576             tex_format != PVR2_TEX_FORMAT_IDX8 ) {
   577         /* Stride textures cannot be mip-mapped, compressed, indexed or twiddled */
   578         unsigned char data[(width*height) << bpp_shift];
   579         if( tex_format == PVR2_TEX_FORMAT_YUV422 ) {
   580             unsigned char tmp[(width*height)<<1];
   581             pvr2_vram64_read_stride( tmp, width<<1, texture_addr, texcache_stride_width<<1, height );
   582             yuv_decode( (uint32_t *)data, (uint32_t *)tmp, width, height );
   583         } else {
   584             pvr2_vram64_read_stride( data, width<<bpp_shift, texture_addr, texcache_stride_width<<bpp_shift, height );
   585         }
   586         glTexImage2D( GL_TEXTURE_2D, 0, intFormat, width, height, 0, format, type, data );
   587         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, min_filter);
   588         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, max_filter);
   589         return;
   590     } 
   592     if( PVR2_TEX_IS_COMPRESSED(mode) ) {
   593         uint16_t tmp[VQ_CODEBOOK_SIZE];
   594         pvr2_vram64_read( (unsigned char *)tmp, texture_addr, VQ_CODEBOOK_SIZE );
   595         texture_addr += VQ_CODEBOOK_SIZE;
   596         vq_get_codebook( &codebook, tmp );
   597     }
   599     int level=0, last_level = 0, mip_width = width, mip_height = height, src_bytes, dest_bytes;
   600     if( PVR2_TEX_IS_MIPMAPPED(mode) ) {
   601         uint32_t src_offset = 0;
   602         min_filter = mipmapfilter;
   603         mip_height = height = width;
   604         while( (1<<last_level) < width ) {
   605             last_level++;
   606             src_offset += ((width>>last_level)*(width>>last_level));
   607         }
   608         if( width != 1 ) {
   609             src_offset += 3;
   610         }
   611         if( PVR2_TEX_IS_COMPRESSED(mode) ) {
   612             src_offset >>= 2;
   613         } else if( tex_format == PVR2_TEX_FORMAT_IDX4 ) {
   614             src_offset >>= 1;
   615         } else if( tex_format == PVR2_TEX_FORMAT_YUV422 ) {
   616             src_offset <<= 1;
   617         } else if( tex_format != PVR2_TEX_FORMAT_IDX8 ) {
   618             src_offset <<= bpp_shift;
   619         }
   620         texture_addr += src_offset;
   621     }
   624     dest_bytes = (mip_width * mip_height) << bpp_shift;
   625     src_bytes = dest_bytes; // Modes will change this (below)
   627     for( level=0; level<= last_level; level++ ) {
   628         unsigned char data[dest_bytes];
   629         /* load data from image, detwiddling/uncompressing as required */
   630         if( tex_format == PVR2_TEX_FORMAT_IDX8 ) {
   631             if( texcache_have_palette_shader ) {
   632                 pvr2_vram64_read_twiddled_8( data, texture_addr, mip_width, mip_height );
   633             } else {
   634                 src_bytes = (mip_width * mip_height);
   635                 int bank = (mode >> 25) &0x03;
   636                 uint32_t *palette = ((uint32_t *)mmio_region_PVR2PAL.mem) + (bank<<8);
   637                 unsigned char tmp[src_bytes];
   638                 pvr2_vram64_read_twiddled_8( tmp, texture_addr, mip_width, mip_height );
   639                 if( bpp_shift == 2 ) {
   640                     decode_pal8_to_32( (uint32_t *)data, tmp, src_bytes, palette );
   641                 } else {
   642                     decode_pal8_to_16( (uint16_t *)data, tmp, src_bytes, palette );
   643                 }
   644             }
   645         } else if( tex_format == PVR2_TEX_FORMAT_IDX4 ) {
   646             src_bytes = (mip_width * mip_height) >> 1;
   647             unsigned char tmp[src_bytes];
   648             if( texcache_have_palette_shader ) {
   649                 pvr2_vram64_read_twiddled_4( tmp, texture_addr, mip_width, mip_height );
   650                 decode_pal4_to_pal8( data, tmp, src_bytes );
   651             } else {
   652                 int bank = (mode >>21 ) & 0x3F;
   653                 uint32_t *palette = ((uint32_t *)mmio_region_PVR2PAL.mem) + (bank<<4);
   654                 pvr2_vram64_read_twiddled_4( tmp, texture_addr, mip_width, mip_height );
   655                 if( bpp_shift == 2 ) {
   656                     decode_pal4_to_32( (uint32_t *)data, tmp, src_bytes, palette );
   657                 } else {
   658                     decode_pal4_to_16( (uint16_t *)data, tmp, src_bytes, palette );
   659                 }
   660             }
   661         } else if( tex_format == PVR2_TEX_FORMAT_YUV422 ) {
   662             src_bytes = ((mip_width*mip_height)<<1);
   663             unsigned char tmp[src_bytes];
   664             if( PVR2_TEX_IS_TWIDDLED(mode) ) {
   665                 pvr2_vram64_read_twiddled_16( tmp, texture_addr, mip_width, mip_height );
   666             } else {
   667                 pvr2_vram64_read( tmp, texture_addr, src_bytes );
   668             }
   669             yuv_decode( (uint32_t *)data, (uint32_t *)tmp, mip_width, mip_height );
   670         } else if( PVR2_TEX_IS_COMPRESSED(mode) ) {
   671             src_bytes = ((mip_width*mip_height) >> 2);
   672             unsigned char tmp[src_bytes];
   673             if( PVR2_TEX_IS_TWIDDLED(mode) ) {
   674                 pvr2_vram64_read_twiddled_8( tmp, texture_addr, mip_width>>1, mip_height>>1 );
   675             } else {
   676                 pvr2_vram64_read( tmp, texture_addr, src_bytes );
   677             }
   678             vq_decode( (uint16_t *)data, tmp, mip_width, mip_height, &codebook );
   679         } else if( PVR2_TEX_IS_TWIDDLED(mode) ) {
   680             pvr2_vram64_read_twiddled_16( data, texture_addr, mip_width, mip_height );
   681         } else {
   682             pvr2_vram64_read( data, texture_addr, src_bytes );
   683         }
   685         /* Pass to GL */
   686         if( level == last_level && level != 0 ) { /* 1x1 stored within a 2x2 */
   687             glTexImage2D( GL_TEXTURE_2D, level, intFormat, 1, 1, 0, format, type,
   688                     data + (3 << bpp_shift) );
   689         } else {
   690             glTexImage2D( GL_TEXTURE_2D, level, intFormat, mip_width, mip_height, 0, format, type,
   691                     data );
   692             if( mip_width > 2 ) {
   693                 mip_width >>= 1;
   694                 mip_height >>= 1;
   695                 dest_bytes >>= 2;
   696                 src_bytes >>= 2;
   697             }
   698             texture_addr -= src_bytes;
   699         }
   700     }
   702     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, min_filter);
   703     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, max_filter);
   704 }
   706 static int texcache_find_texture_slot( uint32_t poly2_masked_word, uint32_t texture_word )
   707 {
   708     uint32_t texture_addr = (texture_word & 0x000FFFFF)<<3;
   709     uint32_t texture_page = texture_addr >> 12;
   710     texcache_entry_index next;
   711     texcache_entry_index idx = texcache_page_lookup[texture_page];
   712     while( idx != EMPTY_ENTRY ) {
   713         texcache_entry_t entry = &texcache_active_list[idx];
   714         if( entry->tex_mode == texture_word &&
   715                 entry->poly2_mode == poly2_masked_word ) {
   716             entry->lru_count = texcache_ref_counter++;
   717             return idx;
   718         }
   719         idx = entry->next;
   720     }
   721     return -1;
   722 }
   724 static int texcache_alloc_texture_slot( uint32_t poly2_word, uint32_t texture_word )
   725 {
   726     uint32_t texture_addr = (texture_word & 0x000FFFFF)<<3;
   727     uint32_t texture_page = texture_addr >> 12;
   728     texcache_entry_index slot = 0;
   730     if( texcache_free_ptr < MAX_TEXTURES ) {
   731         slot = texcache_free_list[texcache_free_ptr++];
   732     } else {
   733         slot = texcache_evict_lru();
   734     }
   736     /* Construct new entry */
   737     assert( texcache_active_list[slot].texture_addr == -1 );
   738     texcache_active_list[slot].texture_addr = texture_addr;
   739     texcache_active_list[slot].tex_mode = texture_word;
   740     texcache_active_list[slot].poly2_mode = poly2_word;
   741     texcache_active_list[slot].lru_count = texcache_ref_counter++;
   743     /* Add entry to the lookup table */
   744     int next = texcache_page_lookup[texture_page];
   745     if( next == slot ) {
   746         int i;
   747         fprintf( stderr, "Active list: " );
   748         for( i=0; i<MAX_TEXTURES; i++ ) {
   749             fprintf( stderr, "%d, ", texcache_active_list[i].next );
   750         }
   751         fprintf( stderr, "\n" );
   752         assert( next != slot );
   754     }
   755     texcache_active_list[slot].next = next;
   756     texcache_page_lookup[texture_page] = slot;
   757     return slot;
   758 }
   760 /**
   761  * Return a texture ID for the texture specified at the supplied address
   762  * and given parameters (the same sequence of bytes could in theory have
   763  * multiple interpretations). We use the texture address as the primary
   764  * index, but allow for multiple instances at each address.
   765  * 
   766  * If the texture has already been bound, return the ID to which it was
   767  * bound. Otherwise obtain an unused texture ID and set it up appropriately.
   768  * The current GL_TEXTURE_2D binding will be changed in this case.
   769  */
   770 GLuint texcache_get_texture( uint32_t poly2_word, uint32_t texture_word )
   771 {
   772     poly2_word &= 0x000F803F; /* Get just the texture-relevant bits */
   773     uint32_t texture_lookup = texture_word;
   774     if( PVR2_TEX_IS_PALETTE(texture_lookup) ) {
   775         texture_lookup &= 0xF81FFFFF; /* Mask out the bank bits */
   776     }
   777     int slot = texcache_find_texture_slot( poly2_word, texture_lookup );
   779     if( slot == -1 ) {
   780         /* Not found - check the free list */
   781         slot = texcache_alloc_texture_slot( poly2_word, texture_lookup );
   783         /* Construct the GL texture */
   784         uint32_t texture_addr = (texture_word & 0x000FFFFF)<<3;
   785         unsigned width = POLY2_TEX_WIDTH(poly2_word);
   786         unsigned height = POLY2_TEX_HEIGHT(poly2_word);
   788         glBindTexture( GL_TEXTURE_2D, texcache_active_list[slot].texture_id );
   789         texcache_load_texture( texture_addr, width, height, texture_word );
   791         /* Set texture parameters from the poly2 word */
   792         if( POLY2_TEX_CLAMP_U(poly2_word) ) {
   793             glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
   794         } else if( POLY2_TEX_MIRROR_U(poly2_word) ) {
   795             glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_MIRRORED_REPEAT );
   796         } else {
   797             glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
   798         }
   799         if( POLY2_TEX_CLAMP_V(poly2_word) ) {
   800             glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
   801         } else if( POLY2_TEX_MIRROR_V(poly2_word) ) {
   802             glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_MIRRORED_REPEAT );
   803         } else {
   804             glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
   805         }
   806     }
   808     return texcache_active_list[slot].texture_id;
   809 }
   811 #if 0
   812 render_buffer_t texcache_get_render_buffer( uint32_t texture_addr, int mode, int width, int height )
   813 {
   814     uint32_t texture_word = ((texture_addr >> 3) & 0x000FFFFF) | PVR2_TEX_UNTWIDDLED;
   815     switch( mode ) {
   816     case COLFMT_BGRA1555: texture_word |= PVR2_TEX_FORMAT_ARGB1555; break;
   817     case COLFMT_RGB565:   texture_word |= PVR2_TEX_FORMAT_RGB565; break;
   818     case COLFMT_BGRA4444: texture_word |= PVR2_TEX_FORMAT_ARGB4444; break;
   819     default:
   820         WARN( "Rendering to non-texture colour format" );
   821     }
   822     if( is_npot_texture(width) )
   823         texture_word |= PVR2_TEX_STRIDE;
   826     int slot = texcache_find_texture_slot( texture_word, width, height );
   827     if( slot == -1 ) {
   828         slot = texcache_alloc_texture_slot( texture_word, width, height );
   829     }
   831     texcache_entry_t entry = &texcache_active_list[slot];
   833     if( entry->buffer == NULL ) {
   834         entry->buffer = pvr2_create_render_buffer( texture_addr, width, height, entry->texture_id );
   835     } else if( entry->buffer->width != width || entry->buffer->height != height ) {        
   836         texcache_release_render_buffer(entry->buffer);
   837         entry->buffer = pvr2_create_render_buffer( texture_addr, width, height, entry->texture_id );
   838     }
   840     return entry->buffer;
   841 }
   842 #endif
   844 /**
   845  * Check the integrity of the texcache. Verifies that every cache slot
   846  * appears exactly once on either the free list or one page list. For 
   847  * active slots, the texture address must also match the page it appears on.
   848  * 
   849  */
   850 void texcache_integrity_check()
   851 {
   852     int i;
   853     int slot_found[MAX_TEXTURES];
   855     memset( slot_found, 0, sizeof(slot_found) );
   857     /* Check entries on the free list */
   858     for( i= texcache_free_ptr; i< MAX_TEXTURES; i++ ) {
   859         int slot = texcache_free_list[i];
   860         assert( slot_found[slot] == 0 );
   861         assert( texcache_active_list[slot].next == EMPTY_ENTRY );
   862         slot_found[slot] = 1;
   863     }
   865     /* Check entries on the active lists */
   866     for( i=0; i< PVR2_RAM_PAGES; i++ ) {
   867         int slot = texcache_page_lookup[i];
   868         while( slot != EMPTY_ENTRY ) {
   869             assert( slot_found[slot] == 0 );
   870             assert( (texcache_active_list[slot].texture_addr >> 12) == i );
   871             slot_found[slot] = 2;
   872             slot = texcache_active_list[slot].next;
   873         }
   874     }
   876     /* Make sure we didn't miss any entries */
   877     for( i=0; i<MAX_TEXTURES; i++ ) {
   878         assert( slot_found[i] != 0 );
   879     }
   880 }
   882 /**
   883  * Dump the contents of the texture cache
   884  */
   885 void texcache_dump()
   886 {
   887     unsigned i;
   888     GLboolean boolresult;
   889     for( i=0; i< PVR2_RAM_PAGES; i++ ) {
   890         int slot = texcache_page_lookup[i];
   891         while( slot != EMPTY_ENTRY ) {
   892             fprintf( stderr, "%-3d: %08X %dx%d (%08X %08X) %s\n", slot,
   893                     texcache_active_list[slot].texture_addr,
   894                     POLY2_TEX_WIDTH(texcache_active_list[slot].poly2_mode),
   895                     POLY2_TEX_HEIGHT(texcache_active_list[slot].poly2_mode),
   896                     texcache_active_list[slot].poly2_mode,
   897                     texcache_active_list[slot].tex_mode,
   898                     (glAreTexturesResident(1, &texcache_active_list[slot].texture_id, &boolresult) ? "[RESIDENT]" : "[NOT RESIDENT]") );
   899             slot = texcache_active_list[slot].next;
   900         }
   901     }
   902 }
   904 void texcache_print_idx4( uint32_t texture_addr, int width )
   905 {
   906     unsigned x,y;
   907     int src_bytes = (width*width>>1);
   908     char tmp[src_bytes];
   909     char data[width*width];
   910     pvr2_vram64_read_twiddled_4( tmp, texture_addr, width, width );
   911     decode_pal4_to_pal8( data, tmp, src_bytes );
   912     for( y=0; y<width; y++ ) {
   913         for( x=0; x<width; x++ ) {
   914             printf( "%1x", data[y*width+x] );
   915         }
   916         printf( "\n" );
   917     }
   918 }
.