filename | src/pvr2/texcache.c |
changeset | 129:88e5ebc991e3 |
prev | 126:988003554ab5 |
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author | nkeynes |
date | Wed Aug 02 04:06:45 2006 +0000 (17 years ago) |
permissions | -rw-r--r-- |
last change | Issue 0003: TA Vertex compiler Initial implementation of the TA. Renderer hooked up to the TA "properly" now as well |
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nkeynes@103 | 1 | /** |
nkeynes@129 | 2 | * $Id: texcache.c,v 1.6 2006-03-30 11:25:42 nkeynes Exp $ |
nkeynes@103 | 3 | * |
nkeynes@103 | 4 | * Texture cache. Responsible for maintaining a working set of OpenGL |
nkeynes@103 | 5 | * textures. |
nkeynes@103 | 6 | * |
nkeynes@103 | 7 | * |
nkeynes@103 | 8 | * Copyright (c) 2005 Nathan Keynes. |
nkeynes@103 | 9 | * |
nkeynes@103 | 10 | * This program is free software; you can redistribute it and/or modify |
nkeynes@103 | 11 | * it under the terms of the GNU General Public License as published by |
nkeynes@103 | 12 | * the Free Software Foundation; either version 2 of the License, or |
nkeynes@103 | 13 | * (at your option) any later version. |
nkeynes@103 | 14 | * |
nkeynes@103 | 15 | * This program is distributed in the hope that it will be useful, |
nkeynes@103 | 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
nkeynes@103 | 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
nkeynes@103 | 18 | * GNU General Public License for more details. |
nkeynes@103 | 19 | */ |
nkeynes@103 | 20 | |
nkeynes@103 | 21 | #include <assert.h> |
nkeynes@103 | 22 | #include "pvr2/pvr2.h" |
nkeynes@103 | 23 | |
nkeynes@103 | 24 | /** Specifies the maximum number of OpenGL |
nkeynes@103 | 25 | * textures we're willing to have open at a time. If more are |
nkeynes@103 | 26 | * needed, textures will be evicted in LRU order. |
nkeynes@103 | 27 | */ |
nkeynes@103 | 28 | #define MAX_TEXTURES 64 |
nkeynes@103 | 29 | |
nkeynes@103 | 30 | /** |
nkeynes@103 | 31 | * Data structure: |
nkeynes@103 | 32 | * |
nkeynes@103 | 33 | * Main operations: |
nkeynes@103 | 34 | * find entry by texture_addr |
nkeynes@103 | 35 | * add new entry |
nkeynes@103 | 36 | * move entry to tail of lru list |
nkeynes@103 | 37 | * remove entry |
nkeynes@103 | 38 | */ |
nkeynes@103 | 39 | |
nkeynes@103 | 40 | typedef signed short texcache_entry_index; |
nkeynes@107 | 41 | #define EMPTY_ENTRY 0xFF |
nkeynes@103 | 42 | |
nkeynes@107 | 43 | static texcache_entry_index texcache_free_ptr = 0; |
nkeynes@103 | 44 | static GLuint texcache_free_list[MAX_TEXTURES]; |
nkeynes@103 | 45 | |
nkeynes@103 | 46 | typedef struct texcache_entry { |
nkeynes@103 | 47 | uint32_t texture_addr; |
nkeynes@103 | 48 | int width, height, mode; |
nkeynes@103 | 49 | GLuint texture_id; |
nkeynes@103 | 50 | texcache_entry_index next; |
nkeynes@103 | 51 | uint32_t lru_count; |
nkeynes@103 | 52 | } *texcache_entry_t; |
nkeynes@103 | 53 | |
nkeynes@103 | 54 | static uint8_t texcache_page_lookup[PVR2_RAM_PAGES]; |
nkeynes@103 | 55 | static uint32_t texcache_ref_counter; |
nkeynes@103 | 56 | static struct texcache_entry texcache_active_list[MAX_TEXTURES]; |
nkeynes@103 | 57 | |
nkeynes@103 | 58 | /** |
nkeynes@108 | 59 | * Initialize the texture cache. |
nkeynes@103 | 60 | */ |
nkeynes@103 | 61 | void texcache_init( ) |
nkeynes@103 | 62 | { |
nkeynes@103 | 63 | int i; |
nkeynes@103 | 64 | for( i=0; i<PVR2_RAM_PAGES; i++ ) { |
nkeynes@103 | 65 | texcache_page_lookup[i] = EMPTY_ENTRY; |
nkeynes@103 | 66 | } |
nkeynes@103 | 67 | for( i=0; i<MAX_TEXTURES; i++ ) { |
nkeynes@103 | 68 | texcache_free_list[i] = i; |
nkeynes@103 | 69 | } |
nkeynes@103 | 70 | texcache_free_ptr = 0; |
nkeynes@103 | 71 | texcache_ref_counter = 0; |
nkeynes@103 | 72 | } |
nkeynes@103 | 73 | |
nkeynes@103 | 74 | /** |
nkeynes@108 | 75 | * Setup the initial texture ids (must be called after the GL context is |
nkeynes@108 | 76 | * prepared) |
nkeynes@108 | 77 | */ |
nkeynes@108 | 78 | void texcache_gl_init( ) |
nkeynes@108 | 79 | { |
nkeynes@108 | 80 | int i; |
nkeynes@108 | 81 | GLuint texids[MAX_TEXTURES]; |
nkeynes@108 | 82 | |
nkeynes@108 | 83 | glGenTextures( MAX_TEXTURES, texids ); |
nkeynes@108 | 84 | for( i=0; i<MAX_TEXTURES; i++ ) { |
nkeynes@108 | 85 | texcache_active_list[i].texture_id = texids[i]; |
nkeynes@108 | 86 | } |
nkeynes@108 | 87 | } |
nkeynes@108 | 88 | |
nkeynes@108 | 89 | /** |
nkeynes@103 | 90 | * Flush all textures from the cache, returning them to the free list. |
nkeynes@103 | 91 | */ |
nkeynes@103 | 92 | void texcache_flush( ) |
nkeynes@103 | 93 | { |
nkeynes@103 | 94 | int i; |
nkeynes@103 | 95 | /* clear structures */ |
nkeynes@103 | 96 | for( i=0; i<PVR2_RAM_PAGES; i++ ) { |
nkeynes@103 | 97 | texcache_page_lookup[i] = EMPTY_ENTRY; |
nkeynes@103 | 98 | } |
nkeynes@103 | 99 | for( i=0; i<MAX_TEXTURES; i++ ) { |
nkeynes@103 | 100 | texcache_free_list[i] = i; |
nkeynes@103 | 101 | } |
nkeynes@103 | 102 | texcache_free_ptr = 0; |
nkeynes@103 | 103 | texcache_ref_counter = 0; |
nkeynes@103 | 104 | } |
nkeynes@103 | 105 | |
nkeynes@103 | 106 | /** |
nkeynes@103 | 107 | * Flush all textures and delete. The cache will be non-functional until |
nkeynes@103 | 108 | * the next call to texcache_init(). This would typically be done if |
nkeynes@103 | 109 | * switching GL targets. |
nkeynes@103 | 110 | */ |
nkeynes@103 | 111 | void texcache_shutdown( ) |
nkeynes@103 | 112 | { |
nkeynes@103 | 113 | GLuint texids[MAX_TEXTURES]; |
nkeynes@103 | 114 | int i; |
nkeynes@103 | 115 | texcache_flush(); |
nkeynes@103 | 116 | |
nkeynes@103 | 117 | for( i=0; i<MAX_TEXTURES; i++ ) { |
nkeynes@103 | 118 | texids[i] = texcache_active_list[i].texture_id; |
nkeynes@103 | 119 | } |
nkeynes@103 | 120 | glDeleteTextures( MAX_TEXTURES, texids ); |
nkeynes@103 | 121 | } |
nkeynes@103 | 122 | |
nkeynes@103 | 123 | /** |
nkeynes@103 | 124 | * Evict all textures contained in the page identified by a texture address. |
nkeynes@103 | 125 | */ |
nkeynes@103 | 126 | void texcache_invalidate_page( uint32_t texture_addr ) { |
nkeynes@103 | 127 | uint32_t texture_page = texture_addr >> 12; |
nkeynes@103 | 128 | texcache_entry_index idx = texcache_page_lookup[texture_page]; |
nkeynes@103 | 129 | if( idx == EMPTY_ENTRY ) |
nkeynes@103 | 130 | return; |
nkeynes@107 | 131 | assert( texcache_free_ptr >= 0 ); |
nkeynes@103 | 132 | do { |
nkeynes@103 | 133 | texcache_entry_t entry = &texcache_active_list[idx]; |
nkeynes@103 | 134 | /* release entry */ |
nkeynes@103 | 135 | texcache_free_ptr--; |
nkeynes@103 | 136 | texcache_free_list[texcache_free_ptr] = idx; |
nkeynes@103 | 137 | idx = entry->next; |
nkeynes@103 | 138 | entry->next = EMPTY_ENTRY; |
nkeynes@103 | 139 | } while( idx != EMPTY_ENTRY ); |
nkeynes@103 | 140 | texcache_page_lookup[texture_page] = EMPTY_ENTRY; |
nkeynes@103 | 141 | } |
nkeynes@103 | 142 | |
nkeynes@103 | 143 | /** |
nkeynes@103 | 144 | * Evict a single texture from the cache. |
nkeynes@103 | 145 | * @return the slot of the evicted texture. |
nkeynes@103 | 146 | */ |
nkeynes@103 | 147 | static texcache_entry_index texcache_evict( void ) |
nkeynes@103 | 148 | { |
nkeynes@103 | 149 | /* Full table scan - take over the entry with the lowest lru value */ |
nkeynes@103 | 150 | texcache_entry_index slot = 0; |
nkeynes@103 | 151 | int lru_value = texcache_active_list[0].lru_count; |
nkeynes@103 | 152 | int i; |
nkeynes@103 | 153 | for( i=1; i<MAX_TEXTURES; i++ ) { |
nkeynes@103 | 154 | /* FIXME: account for rollover */ |
nkeynes@103 | 155 | if( texcache_active_list[i].lru_count < lru_value ) { |
nkeynes@103 | 156 | slot = i; |
nkeynes@103 | 157 | lru_value = texcache_active_list[i].lru_count; |
nkeynes@103 | 158 | } |
nkeynes@103 | 159 | } |
nkeynes@103 | 160 | |
nkeynes@103 | 161 | /* Remove the selected slot from the lookup table */ |
nkeynes@103 | 162 | uint32_t evict_page = texcache_active_list[slot].texture_addr; |
nkeynes@103 | 163 | texcache_entry_index replace_next = texcache_active_list[slot].next; |
nkeynes@103 | 164 | texcache_active_list[slot].next = EMPTY_ENTRY; /* Just for safety */ |
nkeynes@103 | 165 | if( texcache_page_lookup[evict_page] == slot ) { |
nkeynes@103 | 166 | texcache_page_lookup[evict_page] = replace_next; |
nkeynes@103 | 167 | } else { |
nkeynes@103 | 168 | texcache_entry_index idx = texcache_page_lookup[evict_page]; |
nkeynes@103 | 169 | texcache_entry_index next; |
nkeynes@103 | 170 | do { |
nkeynes@103 | 171 | next = texcache_active_list[idx].next; |
nkeynes@103 | 172 | if( next == slot ) { |
nkeynes@103 | 173 | texcache_active_list[idx].next = replace_next; |
nkeynes@103 | 174 | break; |
nkeynes@103 | 175 | } |
nkeynes@103 | 176 | idx = next; |
nkeynes@103 | 177 | } while( next != EMPTY_ENTRY ); |
nkeynes@103 | 178 | } |
nkeynes@103 | 179 | return slot; |
nkeynes@103 | 180 | } |
nkeynes@103 | 181 | |
nkeynes@129 | 182 | static void detwiddle_pal8_to_32(int x1, int y1, int size, int totsize, |
nkeynes@113 | 183 | char **in, uint32_t *out, uint32_t *pal) { |
nkeynes@113 | 184 | if (size == 1) { |
nkeynes@113 | 185 | out[y1 * totsize + x1] = pal[**in]; |
nkeynes@113 | 186 | (*in)++; |
nkeynes@113 | 187 | } else { |
nkeynes@113 | 188 | int ns = size>>1; |
nkeynes@129 | 189 | detwiddle_pal8_to_32(x1, y1, ns, totsize, in, out, pal); |
nkeynes@129 | 190 | detwiddle_pal8_to_32(x1, y1+ns, ns, totsize, in, out, pal); |
nkeynes@129 | 191 | detwiddle_pal8_to_32(x1+ns, y1, ns, totsize, in, out, pal); |
nkeynes@129 | 192 | detwiddle_pal8_to_32(x1+ns, y1+ns, ns, totsize, in, out, pal); |
nkeynes@129 | 193 | } |
nkeynes@129 | 194 | } |
nkeynes@129 | 195 | |
nkeynes@129 | 196 | static void detwiddle_pal8_to_16(int x1, int y1, int size, int totsize, |
nkeynes@129 | 197 | char **in, uint16_t *out, uint16_t *pal) { |
nkeynes@129 | 198 | if (size == 1) { |
nkeynes@129 | 199 | out[y1 * totsize + x1] = pal[**in]; |
nkeynes@129 | 200 | (*in)++; |
nkeynes@129 | 201 | } else { |
nkeynes@129 | 202 | int ns = size>>1; |
nkeynes@129 | 203 | detwiddle_pal8_to_16(x1, y1, ns, totsize, in, out, pal); |
nkeynes@129 | 204 | detwiddle_pal8_to_16(x1, y1+ns, ns, totsize, in, out, pal); |
nkeynes@129 | 205 | detwiddle_pal8_to_16(x1+ns, y1, ns, totsize, in, out, pal); |
nkeynes@129 | 206 | detwiddle_pal8_to_16(x1+ns, y1+ns, ns, totsize, in, out, pal); |
nkeynes@113 | 207 | } |
nkeynes@113 | 208 | } |
nkeynes@113 | 209 | |
nkeynes@126 | 210 | static void detwiddle_16_to_16(int x1, int y1, int size, int totsize, |
nkeynes@126 | 211 | uint16_t **in, uint16_t *out ) { |
nkeynes@126 | 212 | if (size == 1) { |
nkeynes@126 | 213 | out[y1 * totsize + x1] = **in; |
nkeynes@126 | 214 | (*in)++; |
nkeynes@126 | 215 | } else { |
nkeynes@126 | 216 | int ns = size>>1; |
nkeynes@126 | 217 | detwiddle_16_to_16(x1, y1, ns, totsize, in, out); |
nkeynes@126 | 218 | detwiddle_16_to_16(x1, y1+ns, ns, totsize, in, out); |
nkeynes@126 | 219 | detwiddle_16_to_16(x1+ns, y1, ns, totsize, in, out); |
nkeynes@126 | 220 | detwiddle_16_to_16(x1+ns, y1+ns, ns, totsize, in, out); |
nkeynes@126 | 221 | } |
nkeynes@126 | 222 | } |
nkeynes@126 | 223 | |
nkeynes@113 | 224 | |
nkeynes@103 | 225 | /** |
nkeynes@103 | 226 | * Load texture data from the given address and parameters into the currently |
nkeynes@103 | 227 | * bound OpenGL texture. |
nkeynes@103 | 228 | */ |
nkeynes@103 | 229 | static texcache_load_texture( uint32_t texture_addr, int width, int height, |
nkeynes@103 | 230 | int mode ) { |
nkeynes@103 | 231 | uint32_t bytes = width * height; |
nkeynes@108 | 232 | int shift = 1; |
nkeynes@103 | 233 | GLint intFormat, format, type; |
nkeynes@108 | 234 | int tex_format = mode & PVR2_TEX_FORMAT_MASK; |
nkeynes@108 | 235 | |
nkeynes@108 | 236 | if( tex_format == PVR2_TEX_FORMAT_IDX8 || |
nkeynes@108 | 237 | tex_format == PVR2_TEX_FORMAT_IDX4 ) { |
nkeynes@108 | 238 | switch( MMIO_READ( PVR2, PALETTECFG ) & 0x03 ) { |
nkeynes@108 | 239 | case 0: /* ARGB1555 */ |
nkeynes@108 | 240 | intFormat = GL_RGB5_A1; |
nkeynes@108 | 241 | format = GL_RGBA; |
nkeynes@129 | 242 | type = GL_UNSIGNED_SHORT_1_5_5_5_REV; |
nkeynes@108 | 243 | break; |
nkeynes@108 | 244 | case 1: |
nkeynes@108 | 245 | intFormat = GL_RGB; |
nkeynes@108 | 246 | format = GL_RGB; |
nkeynes@129 | 247 | type = GL_UNSIGNED_SHORT_5_6_5_REV; |
nkeynes@108 | 248 | break; |
nkeynes@108 | 249 | case 2: |
nkeynes@108 | 250 | intFormat = GL_RGBA4; |
nkeynes@129 | 251 | format = GL_BGRA; |
nkeynes@129 | 252 | type = GL_UNSIGNED_SHORT_4_4_4_4_REV; |
nkeynes@108 | 253 | break; |
nkeynes@108 | 254 | case 3: |
nkeynes@108 | 255 | intFormat = GL_RGBA8; |
nkeynes@113 | 256 | format = GL_BGRA; |
nkeynes@113 | 257 | type = GL_UNSIGNED_INT_8_8_8_8_REV; |
nkeynes@108 | 258 | shift = 2; |
nkeynes@108 | 259 | break; |
nkeynes@108 | 260 | } |
nkeynes@108 | 261 | |
nkeynes@108 | 262 | if( tex_format == PVR2_TEX_FORMAT_IDX8 ) { |
nkeynes@113 | 263 | unsigned char data[bytes<<shift]; |
nkeynes@108 | 264 | int bank = (mode >> 25) &0x03; |
nkeynes@108 | 265 | char *palette = mmio_region_PVR2PAL.mem + (bank * (256 << shift)); |
nkeynes@108 | 266 | int i; |
nkeynes@113 | 267 | if( shift == 2 ) { |
nkeynes@113 | 268 | char tmp[bytes]; |
nkeynes@113 | 269 | char *p = tmp; |
nkeynes@113 | 270 | pvr2_vram64_read( tmp, texture_addr, bytes ); |
nkeynes@129 | 271 | detwiddle_pal8_to_32( 0, 0, width, width, &p, |
nkeynes@113 | 272 | (uint32_t *)data, (uint32_t *)palette ); |
nkeynes@113 | 273 | } else { |
nkeynes@129 | 274 | char tmp[bytes]; |
nkeynes@129 | 275 | char *p = tmp; |
nkeynes@129 | 276 | pvr2_vram64_read( tmp, texture_addr, bytes ); |
nkeynes@129 | 277 | detwiddle_pal8_to_16( 0, 0, width, width, &p, |
nkeynes@129 | 278 | (uint16_t *)data, (uint16_t *)palette ); |
nkeynes@108 | 279 | } |
nkeynes@108 | 280 | glTexImage2D( GL_TEXTURE_2D, 0, intFormat, width, height, 0, format, type, |
nkeynes@108 | 281 | data ); |
nkeynes@108 | 282 | |
nkeynes@108 | 283 | } |
nkeynes@108 | 284 | } else { |
nkeynes@108 | 285 | switch( tex_format ) { |
nkeynes@108 | 286 | case PVR2_TEX_FORMAT_ARGB1555: |
nkeynes@108 | 287 | bytes <<= 1; |
nkeynes@108 | 288 | intFormat = GL_RGB5_A1; |
nkeynes@108 | 289 | format = GL_RGBA; |
nkeynes@129 | 290 | type = GL_UNSIGNED_SHORT_1_5_5_5_REV; |
nkeynes@108 | 291 | break; |
nkeynes@108 | 292 | case PVR2_TEX_FORMAT_RGB565: |
nkeynes@108 | 293 | bytes <<= 1; |
nkeynes@129 | 294 | intFormat = GL_RGB; |
nkeynes@129 | 295 | format = GL_RGB; |
nkeynes@129 | 296 | type = GL_UNSIGNED_SHORT_5_6_5_REV; |
nkeynes@108 | 297 | break; |
nkeynes@108 | 298 | case PVR2_TEX_FORMAT_ARGB4444: |
nkeynes@108 | 299 | bytes <<= 1; |
nkeynes@108 | 300 | intFormat = GL_RGBA4; |
nkeynes@126 | 301 | format = GL_BGRA; |
nkeynes@126 | 302 | type = GL_UNSIGNED_SHORT_4_4_4_4_REV; |
nkeynes@108 | 303 | break; |
nkeynes@108 | 304 | case PVR2_TEX_FORMAT_YUV422: |
nkeynes@108 | 305 | ERROR( "YUV textures not supported" ); |
nkeynes@108 | 306 | break; |
nkeynes@108 | 307 | case PVR2_TEX_FORMAT_BUMPMAP: |
nkeynes@108 | 308 | ERROR( "Bumpmap not supported" ); |
nkeynes@108 | 309 | break; |
nkeynes@108 | 310 | case PVR2_TEX_FORMAT_IDX4: |
nkeynes@108 | 311 | /* Supported? */ |
nkeynes@108 | 312 | bytes >>= 1; |
nkeynes@108 | 313 | intFormat = GL_INTENSITY4; |
nkeynes@108 | 314 | format = GL_COLOR_INDEX; |
nkeynes@108 | 315 | type = GL_UNSIGNED_BYTE; |
nkeynes@108 | 316 | shift = 0; |
nkeynes@108 | 317 | break; |
nkeynes@108 | 318 | case PVR2_TEX_FORMAT_IDX8: |
nkeynes@108 | 319 | intFormat = GL_INTENSITY8; |
nkeynes@108 | 320 | format = GL_COLOR_INDEX; |
nkeynes@108 | 321 | type = GL_UNSIGNED_BYTE; |
nkeynes@108 | 322 | shift = 0; |
nkeynes@108 | 323 | break; |
nkeynes@108 | 324 | } |
nkeynes@108 | 325 | |
nkeynes@129 | 326 | char data[bytes]; |
nkeynes@108 | 327 | /* load data from image, detwiddling/uncompressing as required */ |
nkeynes@108 | 328 | if( PVR2_TEX_IS_COMPRESSED(mode) ) { |
nkeynes@108 | 329 | ERROR( "VQ Compression not supported" ); |
nkeynes@108 | 330 | } else { |
nkeynes@108 | 331 | if( PVR2_TEX_IS_TWIDDLED(mode) ) { |
nkeynes@126 | 332 | char tmp[bytes]; |
nkeynes@126 | 333 | uint16_t *p = (uint16_t *)tmp; |
nkeynes@126 | 334 | pvr2_vram64_read( tmp, texture_addr, bytes ); |
nkeynes@108 | 335 | /* Untwiddle */ |
nkeynes@126 | 336 | detwiddle_16_to_16( 0, 0, width, width, &p, (uint16_t *)&data ); |
nkeynes@126 | 337 | } else { |
nkeynes@126 | 338 | pvr2_vram64_read( data, texture_addr, bytes ); |
nkeynes@108 | 339 | } |
nkeynes@108 | 340 | } |
nkeynes@108 | 341 | |
nkeynes@108 | 342 | /* Pass to GL */ |
nkeynes@108 | 343 | glTexImage2D( GL_TEXTURE_2D, 0, intFormat, width, height, 0, format, type, |
nkeynes@108 | 344 | data ); |
nkeynes@103 | 345 | } |
nkeynes@108 | 346 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
nkeynes@108 | 347 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
nkeynes@103 | 348 | } |
nkeynes@103 | 349 | |
nkeynes@103 | 350 | /** |
nkeynes@103 | 351 | * Return a texture ID for the texture specified at the supplied address |
nkeynes@103 | 352 | * and given parameters (the same sequence of bytes could in theory have |
nkeynes@103 | 353 | * multiple interpretations). We use the texture address as the primary |
nkeynes@103 | 354 | * index, but allow for multiple instances at each address. The texture |
nkeynes@103 | 355 | * will be bound to the GL_TEXTURE_2D target before being returned. |
nkeynes@103 | 356 | * |
nkeynes@103 | 357 | * If the texture has already been bound, return the ID to which it was |
nkeynes@103 | 358 | * bound. Otherwise obtain an unused texture ID and set it up appropriately. |
nkeynes@103 | 359 | */ |
nkeynes@103 | 360 | GLuint texcache_get_texture( uint32_t texture_addr, int width, int height, |
nkeynes@103 | 361 | int mode ) |
nkeynes@103 | 362 | { |
nkeynes@103 | 363 | uint32_t texture_page = texture_addr >> 12; |
nkeynes@103 | 364 | texcache_entry_index idx = texcache_page_lookup[texture_page]; |
nkeynes@103 | 365 | while( idx != EMPTY_ENTRY ) { |
nkeynes@103 | 366 | texcache_entry_t entry = &texcache_active_list[idx]; |
nkeynes@103 | 367 | if( entry->texture_addr == texture_addr && |
nkeynes@103 | 368 | entry->mode == mode && |
nkeynes@103 | 369 | entry->width == width && |
nkeynes@103 | 370 | entry->height == height ) { |
nkeynes@103 | 371 | entry->lru_count = texcache_ref_counter++; |
nkeynes@103 | 372 | glBindTexture( GL_TEXTURE_2D, entry->texture_id ); |
nkeynes@103 | 373 | return entry->texture_id; |
nkeynes@103 | 374 | } |
nkeynes@103 | 375 | idx = entry->next; |
nkeynes@103 | 376 | } |
nkeynes@103 | 377 | |
nkeynes@103 | 378 | /* Not found - check the free list */ |
nkeynes@103 | 379 | int slot = 0; |
nkeynes@103 | 380 | |
nkeynes@103 | 381 | if( texcache_free_ptr < MAX_TEXTURES ) { |
nkeynes@103 | 382 | slot = texcache_free_list[texcache_free_ptr++]; |
nkeynes@103 | 383 | } else { |
nkeynes@103 | 384 | slot = texcache_evict(); |
nkeynes@103 | 385 | } |
nkeynes@103 | 386 | |
nkeynes@103 | 387 | /* Construct new entry */ |
nkeynes@103 | 388 | texcache_active_list[slot].texture_addr = texture_addr; |
nkeynes@103 | 389 | texcache_active_list[slot].width = width; |
nkeynes@103 | 390 | texcache_active_list[slot].height = height; |
nkeynes@103 | 391 | texcache_active_list[slot].mode = mode; |
nkeynes@103 | 392 | texcache_active_list[slot].lru_count = texcache_ref_counter++; |
nkeynes@103 | 393 | |
nkeynes@103 | 394 | /* Add entry to the lookup table */ |
nkeynes@103 | 395 | texcache_active_list[slot].next = texcache_page_lookup[texture_page]; |
nkeynes@103 | 396 | texcache_page_lookup[texture_page] = slot; |
nkeynes@103 | 397 | |
nkeynes@103 | 398 | /* Construct the GL texture */ |
nkeynes@108 | 399 | glBindTexture( GL_TEXTURE_2D, texcache_active_list[slot].texture_id ); |
nkeynes@103 | 400 | texcache_load_texture( texture_addr, width, height, mode ); |
nkeynes@103 | 401 | |
nkeynes@103 | 402 | return texcache_active_list[slot].texture_id; |
nkeynes@103 | 403 | } |
.