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lxdream.org :: lxdream/src/pvr2/texcache.c
lxdream 0.9.1
released Jun 29
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filename src/pvr2/texcache.c
changeset 270:1e151174ef51
prev224:289ddaeeebb3
next282:01e53698ff38
author nkeynes
date Thu Jan 11 06:51:11 2007 +0000 (13 years ago)
permissions -rw-r--r--
last change Fix crash in texcache_evict
Fix crash decoding small VQ textures
Implement mip-mapped textures of all types
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     1 /**
     2  * $Id: texcache.c,v 1.9 2007-01-11 06:51:11 nkeynes Exp $
     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 "pvr2/pvr2.h"
    24 /** Specifies the maximum number of OpenGL
    25  * textures we're willing to have open at a time. If more are
    26  * needed, textures will be evicted in LRU order.
    27  */
    28 #define MAX_TEXTURES 64
    30 /**
    31  * Data structure:
    32  *
    33  * Main operations:
    34  *    find entry by texture_addr
    35  *    add new entry
    36  *    move entry to tail of lru list
    37  *    remove entry
    38  */
    40 typedef signed short texcache_entry_index;
    41 #define EMPTY_ENTRY 0xFF
    43 static texcache_entry_index texcache_free_ptr = 0;
    44 static GLuint texcache_free_list[MAX_TEXTURES];
    46 typedef struct texcache_entry {
    47     uint32_t texture_addr;
    48     int width, height, mode;
    49     GLuint texture_id;
    50     texcache_entry_index next;
    51     uint32_t lru_count;
    52 } *texcache_entry_t;
    54 static uint8_t texcache_page_lookup[PVR2_RAM_PAGES];
    55 static uint32_t texcache_ref_counter;
    56 static struct texcache_entry texcache_active_list[MAX_TEXTURES];
    58 /**
    59  * Initialize the texture cache.
    60  */
    61 void texcache_init( )
    62 {
    63     int i;
    64     for( i=0; i<PVR2_RAM_PAGES; i++ ) {
    65 	texcache_page_lookup[i] = EMPTY_ENTRY;
    66     }
    67     for( i=0; i<MAX_TEXTURES; i++ ) {
    68 	texcache_free_list[i] = i;
    69     }
    70     texcache_free_ptr = 0;
    71     texcache_ref_counter = 0;
    72 }
    74 /**
    75  * Setup the initial texture ids (must be called after the GL context is
    76  * prepared)
    77  */
    78 void texcache_gl_init( )
    79 {
    80     int i;
    81     GLuint texids[MAX_TEXTURES];
    83     glGenTextures( MAX_TEXTURES, texids );
    84     for( i=0; i<MAX_TEXTURES; i++ ) {
    85 	texcache_active_list[i].texture_id = texids[i];
    86     }
    87 }
    89 /**
    90  * Flush all textures from the cache, returning them to the free list.
    91  */
    92 void texcache_flush( )
    93 {
    94     int i;
    95     /* clear structures */
    96     for( i=0; i<PVR2_RAM_PAGES; i++ ) {
    97 	texcache_page_lookup[i] = EMPTY_ENTRY;
    98     }
    99     for( i=0; i<MAX_TEXTURES; i++ ) {
   100 	texcache_free_list[i] = i;
   101     }
   102     texcache_free_ptr = 0;
   103     texcache_ref_counter = 0;
   104 }
   106 /**
   107  * Flush all textures and delete. The cache will be non-functional until
   108  * the next call to texcache_init(). This would typically be done if
   109  * switching GL targets.
   110  */    
   111 void texcache_shutdown( )
   112 {
   113     GLuint texids[MAX_TEXTURES];
   114     int i;
   115     texcache_flush();
   117     for( i=0; i<MAX_TEXTURES; i++ ) {
   118 	texids[i] = texcache_active_list[i].texture_id;
   119     }
   120     glDeleteTextures( MAX_TEXTURES, texids );
   121 }
   123 /**
   124  * Evict all textures contained in the page identified by a texture address.
   125  */
   126 void texcache_invalidate_page( uint32_t texture_addr ) {
   127     uint32_t texture_page = texture_addr >> 12;
   128     texcache_entry_index idx = texcache_page_lookup[texture_page];
   129     if( idx == EMPTY_ENTRY )
   130 	return;
   131     assert( texcache_free_ptr >= 0 );
   132     do {
   133 	texcache_entry_t entry = &texcache_active_list[idx];	
   134 	/* release entry */
   135 	texcache_free_ptr--;
   136 	texcache_free_list[texcache_free_ptr] = idx;
   137 	idx = entry->next;
   138 	entry->next = EMPTY_ENTRY;
   139     } while( idx != EMPTY_ENTRY );
   140     texcache_page_lookup[texture_page] = EMPTY_ENTRY;
   141 }
   143 /**
   144  * Evict a single texture from the cache.
   145  * @return the slot of the evicted texture.
   146  */
   147 static texcache_entry_index texcache_evict( void )
   148 {
   149     /* Full table scan - take over the entry with the lowest lru value */
   150     texcache_entry_index slot = 0;
   151     int lru_value = texcache_active_list[0].lru_count;
   152     int i;
   153     for( i=1; i<MAX_TEXTURES; i++ ) {
   154 	/* FIXME: account for rollover */
   155 	if( texcache_active_list[i].lru_count < lru_value ) {
   156 	    slot = i;
   157 	    lru_value = texcache_active_list[i].lru_count;
   158 	}
   159     }
   161     /* Remove the selected slot from the lookup table */
   162     uint32_t evict_page = texcache_active_list[slot].texture_addr >> 12;
   163     texcache_entry_index replace_next = texcache_active_list[slot].next;
   164     texcache_active_list[slot].next = EMPTY_ENTRY; /* Just for safety */
   165     if( texcache_page_lookup[evict_page] == slot ) {
   166 	texcache_page_lookup[evict_page] = replace_next;
   167     } else {
   168 	texcache_entry_index idx = texcache_page_lookup[evict_page];
   169 	texcache_entry_index next;
   170 	do {
   171 	    next = texcache_active_list[idx].next;
   172 	    if( next == slot ) {
   173 		texcache_active_list[idx].next = replace_next;
   174 		break;
   175 	    }
   176 	    idx = next;
   177 	} while( next != EMPTY_ENTRY );
   178     }
   179     return slot;
   180 }
   182 static void detwiddle_pal8_to_32(int x1, int y1, int size, int totsize,
   183 				 char **in, uint32_t *out, uint32_t *pal) {
   184     if (size == 1) {
   185 	out[y1 * totsize + x1] = pal[**in];
   186 	(*in)++;
   187     } else {
   188 	int ns = size>>1;
   189 	detwiddle_pal8_to_32(x1, y1, ns, totsize, in, out, pal);
   190 	detwiddle_pal8_to_32(x1, y1+ns, ns, totsize, in, out, pal);
   191 	detwiddle_pal8_to_32(x1+ns, y1, ns, totsize, in, out, pal);
   192 	detwiddle_pal8_to_32(x1+ns, y1+ns, ns, totsize, in, out, pal);
   193     }
   194 }
   196 static void detwiddle_pal8_to_16(int x1, int y1, int size, int totsize,
   197 				 char **in, uint16_t *out, uint16_t *pal) {
   198     if (size == 1) {
   199 	out[y1 * totsize + x1] = pal[**in];
   200 	(*in)++;
   201     } else {
   202 	int ns = size>>1;
   203 	detwiddle_pal8_to_16(x1, y1, ns, totsize, in, out, pal);
   204 	detwiddle_pal8_to_16(x1, y1+ns, ns, totsize, in, out, pal);
   205 	detwiddle_pal8_to_16(x1+ns, y1, ns, totsize, in, out, pal);
   206 	detwiddle_pal8_to_16(x1+ns, y1+ns, ns, totsize, in, out, pal);
   207     }
   208 }
   210 static void detwiddle_16_to_16(int x1, int y1, int size, int totsize,
   211 			       uint16_t **in, uint16_t *out ) {
   212     if (size == 1) {
   213 	out[y1 * totsize + x1] = **in;
   214 	(*in)++;
   215     } else {
   216 	int ns = size>>1;
   217 	detwiddle_16_to_16(x1, y1, ns, totsize, in, out);
   218 	detwiddle_16_to_16(x1, y1+ns, ns, totsize, in, out);
   219 	detwiddle_16_to_16(x1+ns, y1, ns, totsize, in, out);
   220 	detwiddle_16_to_16(x1+ns, y1+ns, ns, totsize, in, out);
   221     }
   222 }
   224 #define VQ_CODEBOOK_SIZE 2048 /* 256 entries * 4 pixels per quad * 2 byte pixels */
   226 struct vq_codebook {
   227     uint16_t quad[256][4];
   228 };
   230 static void detwiddle_vq_to_16(int x1, int y1, int size, int totsize,
   231 		   uint8_t **in, uint16_t *out, struct vq_codebook *codebook ) {
   232     if( size == 2 ) {
   233 	uint8_t code = **in;
   234 	(*in)++;
   235 	out[y1 * totsize + x1] = codebook->quad[code][0];
   236 	out[y1 * totsize + x1 + 1] = codebook->quad[code][1];
   237 	out[(y1+1) * totsize + x1] = codebook->quad[code][2];
   238 	out[(y1+1) * totsize + x1 + 1] = codebook->quad[code][3];
   239     } else {
   240 	int ns = size>>1;
   241 	detwiddle_vq_to_16(x1, y1, ns, totsize, in, out, codebook);
   242 	detwiddle_vq_to_16(x1, y1+ns, ns, totsize, in, out, codebook);
   243 	detwiddle_vq_to_16(x1+ns, y1, ns, totsize, in, out, codebook);
   244 	detwiddle_vq_to_16(x1+ns, y1+ns, ns, totsize, in, out, codebook);
   245     }	
   246 }
   248 static void vq_get_codebook( struct vq_codebook *codebook, 
   249 				uint16_t *input )
   250 {
   251     /* Detwiddle the codebook, for the sake of my own sanity if nothing else */
   252     uint16_t *p = (uint16_t *)input;
   253     int i;
   254     for( i=0; i<256; i++ ) {
   255 	codebook->quad[i][0] = *p++;
   256 	codebook->quad[i][2] = *p++;
   257 	codebook->quad[i][1] = *p++;
   258 	codebook->quad[i][3] = *p++;
   259     }
   260 }    
   263 static void vq_decode( int width, int height, char *input, uint16_t *output,
   264 		       struct vq_codebook *codebook, int twiddled ) {
   265     int i,j;
   267     uint8_t *c = (uint8_t *)input;
   268     if( twiddled ) {
   269 	detwiddle_vq_to_16( 0, 0, width, width, &c, output, codebook );
   270     } else {
   271 	for( j=0; j<height; j+=2 ) {
   272 	    for( i=0; i<width; i+=2 ) {
   273 		uint8_t code = *c;
   274 		output[i + j*width] = codebook->quad[code][0];
   275 		output[i + 1 + j*width] = codebook->quad[code][1];
   276 		output[i + (j+1)*width] = codebook->quad[code][2];
   277 		output[i + 1 + (j+1)*width] = codebook->quad[code][3];
   278 	    }
   279 	}
   280     }
   281 }
   283 /**
   284  * Load texture data from the given address and parameters into the currently
   285  * bound OpenGL texture.
   286  */
   287 static texcache_load_texture( uint32_t texture_addr, int width, int height,
   288 			      int mode ) {
   289     uint32_t bytes = width * height;
   290     int shift = 1;
   291     GLint intFormat, format, type;
   292     int tex_format = mode & PVR2_TEX_FORMAT_MASK;
   293     struct vq_codebook codebook;
   294     GLint filter = GL_LINEAR;
   296     /* Decode the format parameters */
   297     switch( tex_format ) {
   298     case PVR2_TEX_FORMAT_IDX4:
   299 	ERROR( "4-bit indexed textures not supported" );
   300     case PVR2_TEX_FORMAT_IDX8:
   301 	switch( MMIO_READ( PVR2, RENDER_PALETTE ) & 0x03 ) {
   302 	case 0: /* ARGB1555 */
   303 	    intFormat = GL_RGB5_A1;
   304 	    format = GL_RGBA;
   305 	    type = GL_UNSIGNED_SHORT_1_5_5_5_REV;
   306 	    break;
   307 	case 1: 
   308 	    intFormat = GL_RGB;
   309 	    format = GL_RGB;
   310 	    type = GL_UNSIGNED_SHORT_5_6_5_REV;
   311 	    break;
   312 	case 2:
   313 	    intFormat = GL_RGBA4;
   314 	    format = GL_BGRA;
   315 	    type = GL_UNSIGNED_SHORT_4_4_4_4_REV;
   316 	    break;
   317 	case 3:
   318 	    intFormat = GL_RGBA8;
   319 	    format = GL_BGRA;
   320 	    type = GL_UNSIGNED_INT_8_8_8_8_REV;
   321 	    shift = 2;
   322 	    break;
   323 	}
   324 	bytes <<= shift;
   325 	break;
   327     case PVR2_TEX_FORMAT_ARGB1555:
   328 	bytes <<= 1;
   329 	intFormat = GL_RGB5_A1;
   330 	format = GL_RGBA;
   331 	type = GL_UNSIGNED_SHORT_1_5_5_5_REV;
   332 	break;
   333     case PVR2_TEX_FORMAT_RGB565:
   334 	bytes <<= 1;
   335 	intFormat = GL_RGB;
   336 	format = GL_RGB;
   337 	type = GL_UNSIGNED_SHORT_5_6_5_REV;
   338 	break;
   339     case PVR2_TEX_FORMAT_ARGB4444:
   340 	bytes <<= 1;
   341 	intFormat = GL_RGBA4;
   342 	format = GL_BGRA;
   343 	type = GL_UNSIGNED_SHORT_4_4_4_4_REV;
   344 	break;
   345     case PVR2_TEX_FORMAT_YUV422:
   346 	ERROR( "YUV textures not supported" );
   347 	break;
   348     case PVR2_TEX_FORMAT_BUMPMAP:
   349 	ERROR( "Bumpmap not supported" );
   350 	break;
   351     }
   353     int level=0, last_level = 0, mip_width = width, mip_height = height, mip_bytes = bytes;
   354     if( PVR2_TEX_IS_MIPMAPPED(mode) ) {
   355 	int i;
   356 	for( i=0; 1<<(i+1) < width; i++ );
   357 	last_level = i;
   358 	mip_width = width >> i;
   359 	mip_height= height >> i;
   360 	mip_bytes = bytes >> (i*2);
   361 	filter = GL_LINEAR_MIPMAP_LINEAR;
   362     }
   364     if( PVR2_TEX_IS_COMPRESSED(mode) ) {
   365 	uint16_t tmp[VQ_CODEBOOK_SIZE];
   366 	pvr2_vram64_read( (char *)tmp, texture_addr, VQ_CODEBOOK_SIZE );
   367 	texture_addr += VQ_CODEBOOK_SIZE;
   368 	vq_get_codebook( &codebook, tmp );
   369     }
   371     for( level=last_level; level>= 0; level-- ) {
   372 	char data[mip_bytes];
   373 	/* load data from image, detwiddling/uncompressing as required */
   374 	if( tex_format == PVR2_TEX_FORMAT_IDX8 ) {
   375 	    int inputlength = mip_bytes >> shift;
   376 	    int bank = (mode >> 25) &0x03;
   377 	    char *palette = mmio_region_PVR2PAL.mem + (bank * (256 << shift));
   378 	    char tmp[inputlength];
   379 	    char *p = tmp;
   380 	    pvr2_vram64_read( tmp, texture_addr, inputlength );
   381 	    if( shift == 2 ) {
   382 		detwiddle_pal8_to_32( 0, 0, mip_width, mip_width, &p, 
   383 				      (uint32_t *)data, (uint32_t *)palette );
   384 	    } else {
   385 		detwiddle_pal8_to_16( 0, 0, mip_width, mip_width, &p,
   386 				      (uint16_t *)data, (uint16_t *)palette );
   387 	    }
   388 	} else if( PVR2_TEX_IS_COMPRESSED(mode) ) {
   389 	    int inputlength = ((mip_width*mip_height) >> 2);
   390 	    char tmp[inputlength];
   391 	    pvr2_vram64_read( tmp, texture_addr, inputlength );
   392 	    vq_decode( mip_width, mip_height, tmp, (uint16_t *)&data, &codebook, 
   393 		       PVR2_TEX_IS_TWIDDLED(mode) );
   394 	} else if( PVR2_TEX_IS_TWIDDLED(mode) ) {
   395 	    char tmp[mip_bytes];
   396 	    uint16_t *p = (uint16_t *)tmp;
   397 	    pvr2_vram64_read( tmp, texture_addr, mip_bytes );
   398 	    /* Untwiddle */
   399 	    detwiddle_16_to_16( 0, 0, mip_width, mip_width, &p, (uint16_t *)&data );
   400 	} else {
   401 	    pvr2_vram64_read( data, texture_addr, mip_bytes );
   402 	}
   404 	if( PVR2_TEX_IS_MIPMAPPED(mode) && mip_width == 2 ) {
   405 	    /* Opengl requires a 1x1 texture, but the PVR2 doesn't. This should
   406 	     * strictly speaking be the average of the 2x2 texture, but we're
   407 	     * lazy at the moment */
   408 	    glTexImage2D( GL_TEXTURE_2D, level+1, intFormat, 1, 1, 0, format, type, data );
   409 	}
   411 	/* Pass to GL */
   412 	glTexImage2D( GL_TEXTURE_2D, level, intFormat, mip_width, mip_height, 0, format, type,
   413 		      data );
   414 	texture_addr += mip_bytes;
   415 	mip_width <<= 1;
   416 	mip_height <<= 1;
   417 	mip_bytes <<= 2;
   418     }
   420     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter);
   421     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
   422 }
   424 /**
   425  * Return a texture ID for the texture specified at the supplied address
   426  * and given parameters (the same sequence of bytes could in theory have
   427  * multiple interpretations). We use the texture address as the primary
   428  * index, but allow for multiple instances at each address. The texture
   429  * will be bound to the GL_TEXTURE_2D target before being returned.
   430  * 
   431  * If the texture has already been bound, return the ID to which it was
   432  * bound. Otherwise obtain an unused texture ID and set it up appropriately.
   433  */
   434 GLuint texcache_get_texture( uint32_t texture_addr, int width, int height,
   435 			     int mode )
   436 {
   437     uint32_t texture_page = texture_addr >> 12;
   438     texcache_entry_index idx = texcache_page_lookup[texture_page];
   439     while( idx != EMPTY_ENTRY ) {
   440 	texcache_entry_t entry = &texcache_active_list[idx];
   441 	if( entry->texture_addr == texture_addr &&
   442 	    entry->mode == mode &&
   443 	    entry->width == width &&
   444 	    entry->height == height ) {
   445 	    entry->lru_count = texcache_ref_counter++;
   446 	    glBindTexture( GL_TEXTURE_2D, entry->texture_id );
   447 	    return entry->texture_id;
   448 	}
   449         idx = entry->next;
   450     }
   452     /* Not found - check the free list */
   453     int slot = 0;
   455     if( texcache_free_ptr < MAX_TEXTURES ) {
   456 	slot = texcache_free_list[texcache_free_ptr++];
   457     } else {
   458 	slot = texcache_evict();
   459     }
   461     /* Construct new entry */
   462     texcache_active_list[slot].texture_addr = texture_addr;
   463     texcache_active_list[slot].width = width;
   464     texcache_active_list[slot].height = height;
   465     texcache_active_list[slot].mode = mode;
   466     texcache_active_list[slot].lru_count = texcache_ref_counter++;
   468     /* Add entry to the lookup table */
   469     texcache_active_list[slot].next = texcache_page_lookup[texture_page];
   470     texcache_page_lookup[texture_page] = slot;
   472     /* Construct the GL texture */
   473     glBindTexture( GL_TEXTURE_2D, texcache_active_list[slot].texture_id );
   474     texcache_load_texture( texture_addr, width, height, mode );
   476     return texcache_active_list[slot].texture_id;
   477 }
.