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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 282:01e53698ff38
prev270:1e151174ef51
next284:808617ee7135
author nkeynes
date Sun Jan 14 11:43:00 2007 +0000 (13 years ago)
permissions -rw-r--r--
last change First cut of YUV converter
file annotate diff log raw
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/**
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 * $Id: texcache.c,v 1.10 2007-01-14 11:43:00 nkeynes Exp $
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 *
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 * Texture cache. Responsible for maintaining a working set of OpenGL 
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 * textures. 
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 *
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 *
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 * Copyright (c) 2005 Nathan Keynes.
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 */
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#include <assert.h>
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#include "pvr2/pvr2.h"
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/** Specifies the maximum number of OpenGL
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 * textures we're willing to have open at a time. If more are
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 * needed, textures will be evicted in LRU order.
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 */
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#define MAX_TEXTURES 64
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/**
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 * Data structure:
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 *
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 * Main operations:
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 *    find entry by texture_addr
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 *    add new entry
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 *    move entry to tail of lru list
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 *    remove entry
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 */
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typedef signed short texcache_entry_index;
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#define EMPTY_ENTRY 0xFF
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static texcache_entry_index texcache_free_ptr = 0;
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static GLuint texcache_free_list[MAX_TEXTURES];
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typedef struct texcache_entry {
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    uint32_t texture_addr;
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    int width, height, mode;
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    GLuint texture_id;
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    texcache_entry_index next;
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    uint32_t lru_count;
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} *texcache_entry_t;
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static uint8_t texcache_page_lookup[PVR2_RAM_PAGES];
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static uint32_t texcache_ref_counter;
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static struct texcache_entry texcache_active_list[MAX_TEXTURES];
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/**
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 * Initialize the texture cache.
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 */
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void texcache_init( )
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{
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    int i;
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    for( i=0; i<PVR2_RAM_PAGES; i++ ) {
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	texcache_page_lookup[i] = EMPTY_ENTRY;
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    }
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    for( i=0; i<MAX_TEXTURES; i++ ) {
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	texcache_free_list[i] = i;
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    }
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    texcache_free_ptr = 0;
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    texcache_ref_counter = 0;
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}
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/**
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 * Setup the initial texture ids (must be called after the GL context is
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 * prepared)
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 */
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void texcache_gl_init( )
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{
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    int i;
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    GLuint texids[MAX_TEXTURES];
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    glGenTextures( MAX_TEXTURES, texids );
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    for( i=0; i<MAX_TEXTURES; i++ ) {
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	texcache_active_list[i].texture_id = texids[i];
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    }
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}
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/**
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 * Flush all textures from the cache, returning them to the free list.
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 */
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void texcache_flush( )
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{
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    int i;
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    /* clear structures */
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    for( i=0; i<PVR2_RAM_PAGES; i++ ) {
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	texcache_page_lookup[i] = EMPTY_ENTRY;
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    }
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    for( i=0; i<MAX_TEXTURES; i++ ) {
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	texcache_free_list[i] = i;
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    }
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    texcache_free_ptr = 0;
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    texcache_ref_counter = 0;
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}
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/**
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 * Flush all textures and delete. The cache will be non-functional until
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 * the next call to texcache_init(). This would typically be done if
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 * switching GL targets.
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 */    
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void texcache_shutdown( )
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{
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    GLuint texids[MAX_TEXTURES];
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    int i;
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    texcache_flush();
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    for( i=0; i<MAX_TEXTURES; i++ ) {
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	texids[i] = texcache_active_list[i].texture_id;
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    }
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    glDeleteTextures( MAX_TEXTURES, texids );
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}
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/**
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 * Evict all textures contained in the page identified by a texture address.
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 */
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void texcache_invalidate_page( uint32_t texture_addr ) {
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    uint32_t texture_page = texture_addr >> 12;
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    texcache_entry_index idx = texcache_page_lookup[texture_page];
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    if( idx == EMPTY_ENTRY )
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	return;
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    assert( texcache_free_ptr >= 0 );
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    do {
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	texcache_entry_t entry = &texcache_active_list[idx];	
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	/* release entry */
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	texcache_free_ptr--;
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	texcache_free_list[texcache_free_ptr] = idx;
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	idx = entry->next;
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	entry->next = EMPTY_ENTRY;
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    } while( idx != EMPTY_ENTRY );
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    texcache_page_lookup[texture_page] = EMPTY_ENTRY;
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}
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/**
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 * Evict a single texture from the cache.
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 * @return the slot of the evicted texture.
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 */
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static texcache_entry_index texcache_evict( void )
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{
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    /* Full table scan - take over the entry with the lowest lru value */
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    texcache_entry_index slot = 0;
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    int lru_value = texcache_active_list[0].lru_count;
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    int i;
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    for( i=1; i<MAX_TEXTURES; i++ ) {
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	/* FIXME: account for rollover */
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	if( texcache_active_list[i].lru_count < lru_value ) {
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	    slot = i;
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	    lru_value = texcache_active_list[i].lru_count;
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	}
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    }
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    /* Remove the selected slot from the lookup table */
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    uint32_t evict_page = texcache_active_list[slot].texture_addr >> 12;
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    texcache_entry_index replace_next = texcache_active_list[slot].next;
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    texcache_active_list[slot].next = EMPTY_ENTRY; /* Just for safety */
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    if( texcache_page_lookup[evict_page] == slot ) {
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	texcache_page_lookup[evict_page] = replace_next;
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    } else {
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	texcache_entry_index idx = texcache_page_lookup[evict_page];
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	texcache_entry_index next;
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	do {
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	    next = texcache_active_list[idx].next;
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	    if( next == slot ) {
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		texcache_active_list[idx].next = replace_next;
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		break;
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	    }
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	    idx = next;
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	} while( next != EMPTY_ENTRY );
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    }
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    return slot;
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}
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static void detwiddle_pal8_to_32(int x1, int y1, int size, int totsize,
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				 char **in, uint32_t *out, uint32_t *pal) {
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    if (size == 1) {
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	out[y1 * totsize + x1] = pal[**in];
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	(*in)++;
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    } else {
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	int ns = size>>1;
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	detwiddle_pal8_to_32(x1, y1, ns, totsize, in, out, pal);
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	detwiddle_pal8_to_32(x1, y1+ns, ns, totsize, in, out, pal);
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	detwiddle_pal8_to_32(x1+ns, y1, ns, totsize, in, out, pal);
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	detwiddle_pal8_to_32(x1+ns, y1+ns, ns, totsize, in, out, pal);
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    }
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}
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static void detwiddle_pal8_to_16(int x1, int y1, int size, int totsize,
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				 char **in, uint16_t *out, uint16_t *pal) {
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    if (size == 1) {
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	out[y1 * totsize + x1] = pal[**in];
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	(*in)++;
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    } else {
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	int ns = size>>1;
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	detwiddle_pal8_to_16(x1, y1, ns, totsize, in, out, pal);
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	detwiddle_pal8_to_16(x1, y1+ns, ns, totsize, in, out, pal);
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	detwiddle_pal8_to_16(x1+ns, y1, ns, totsize, in, out, pal);
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	detwiddle_pal8_to_16(x1+ns, y1+ns, ns, totsize, in, out, pal);
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    }
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}
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static void detwiddle_16_to_16(int x1, int y1, int size, int totsize,
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			       uint16_t **in, uint16_t *out ) {
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    if (size == 1) {
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	out[y1 * totsize + x1] = **in;
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	(*in)++;
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    } else {
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	int ns = size>>1;
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	detwiddle_16_to_16(x1, y1, ns, totsize, in, out);
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	detwiddle_16_to_16(x1, y1+ns, ns, totsize, in, out);
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	detwiddle_16_to_16(x1+ns, y1, ns, totsize, in, out);
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	detwiddle_16_to_16(x1+ns, y1+ns, ns, totsize, in, out);
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    }
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}
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#define VQ_CODEBOOK_SIZE 2048 /* 256 entries * 4 pixels per quad * 2 byte pixels */
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struct vq_codebook {
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    uint16_t quad[256][4];
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};
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static void detwiddle_vq_to_16(int x1, int y1, int size, int totsize,
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		   uint8_t **in, uint16_t *out, struct vq_codebook *codebook ) {
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    if( size == 2 ) {
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	uint8_t code = **in;
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	(*in)++;
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	out[y1 * totsize + x1] = codebook->quad[code][0];
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	out[y1 * totsize + x1 + 1] = codebook->quad[code][1];
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	out[(y1+1) * totsize + x1] = codebook->quad[code][2];
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	out[(y1+1) * totsize + x1 + 1] = codebook->quad[code][3];
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    } else {
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	int ns = size>>1;
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	detwiddle_vq_to_16(x1, y1, ns, totsize, in, out, codebook);
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	detwiddle_vq_to_16(x1, y1+ns, ns, totsize, in, out, codebook);
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	detwiddle_vq_to_16(x1+ns, y1, ns, totsize, in, out, codebook);
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	detwiddle_vq_to_16(x1+ns, y1+ns, ns, totsize, in, out, codebook);
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    }	
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}
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static void vq_get_codebook( struct vq_codebook *codebook, 
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				uint16_t *input )
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{
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    /* Detwiddle the codebook, for the sake of my own sanity if nothing else */
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    uint16_t *p = (uint16_t *)input;
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    int i;
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    for( i=0; i<256; i++ ) {
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	codebook->quad[i][0] = *p++;
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	codebook->quad[i][2] = *p++;
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	codebook->quad[i][1] = *p++;
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	codebook->quad[i][3] = *p++;
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    }
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}    
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static void vq_decode( int width, int height, char *input, uint16_t *output,
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		       struct vq_codebook *codebook, int twiddled ) {
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    int i,j;
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    uint8_t *c = (uint8_t *)input;
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    if( twiddled ) {
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	detwiddle_vq_to_16( 0, 0, width, width, &c, output, codebook );
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    } else {
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	for( j=0; j<height; j+=2 ) {
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	    for( i=0; i<width; i+=2 ) {
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		uint8_t code = *c;
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		output[i + j*width] = codebook->quad[code][0];
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		output[i + 1 + j*width] = codebook->quad[code][1];
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		output[i + (j+1)*width] = codebook->quad[code][2];
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		output[i + 1 + (j+1)*width] = codebook->quad[code][3];
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	    }
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	}
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    }
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}
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static inline uint32_t yuv_to_rgb32( float y, float u, float v )
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{
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    u -= 128;
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    v -= 128;
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    int r = (int)(y + v*1.375);
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    int g = (int)(y - u*0.34375 - v*0.6875);
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    int b = (int)(y + u*1.71875);
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    if( r > 255 ) { r = 255; } else if( r < 0 ) { r = 0; }
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    if( g > 255 ) { g = 255; } else if( g < 0 ) { g = 0; }
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    if( b > 255 ) { b = 255; } else if( b < 0 ) { b = 0; }
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    return 0xFF000000 | (r<<24) | (g<<16) | (b<<16);
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   294
}
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/**
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 * Convert non-twiddled YUV texture data into RGB32 data - most GL implementations don't
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 * directly support this format unfortunately. The input data is formatted as
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 * 32 bits = 2 horizontal pixels, UYVY. This is currently done rather inefficiently
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 * in floating point.
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 */
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static void yuv_decode( int width, int height, uint32_t *input, uint32_t *output )
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{
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    int x, y;
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    uint32_t *p = input;
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    for( y=0; y<height; y++ ) {
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	for( x=0; x<width; x+=2 ) {
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	    float u = (float)(*p & 0xFF);
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	    float y0 = (float)( (*p>>8)&0xFF );
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	    float v = (float)( (*p>>16)&0xFF );
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	    float y1 = (float)( (*p>>24)&0xFF );
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	    *output++ = yuv_to_rgb32( y0, u, v ); 
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	    *output++ = yuv_to_rgb32( y1, u, v );
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	}
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    }
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}
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/**
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 * Load texture data from the given address and parameters into the currently
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 * bound OpenGL texture.
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 */
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static texcache_load_texture( uint32_t texture_addr, int width, int height,
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			      int mode ) {
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    uint32_t bytes = width * height;
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    int shift = 1;
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    GLint intFormat, format, type;
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   328
    int tex_format = mode & PVR2_TEX_FORMAT_MASK;
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    struct vq_codebook codebook;
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    GLint filter = GL_LINEAR;
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   331
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    /* Decode the format parameters */
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    switch( tex_format ) {
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    case PVR2_TEX_FORMAT_IDX4:
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	ERROR( "4-bit indexed textures not supported" );
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    case PVR2_TEX_FORMAT_IDX8:
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	switch( MMIO_READ( PVR2, RENDER_PALETTE ) & 0x03 ) {
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	case 0: /* ARGB1555 */
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	    intFormat = GL_RGB5_A1;
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	    format = GL_RGBA;
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	    type = GL_UNSIGNED_SHORT_1_5_5_5_REV;
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	    break;
nkeynes@108
   343
	case 1: 
nkeynes@108
   344
	    intFormat = GL_RGB;
nkeynes@108
   345
	    format = GL_RGB;
nkeynes@129
   346
	    type = GL_UNSIGNED_SHORT_5_6_5_REV;
nkeynes@108
   347
	    break;
nkeynes@108
   348
	case 2:
nkeynes@108
   349
	    intFormat = GL_RGBA4;
nkeynes@129
   350
	    format = GL_BGRA;
nkeynes@129
   351
	    type = GL_UNSIGNED_SHORT_4_4_4_4_REV;
nkeynes@108
   352
	    break;
nkeynes@108
   353
	case 3:
nkeynes@108
   354
	    intFormat = GL_RGBA8;
nkeynes@113
   355
	    format = GL_BGRA;
nkeynes@113
   356
	    type = GL_UNSIGNED_INT_8_8_8_8_REV;
nkeynes@108
   357
	    shift = 2;
nkeynes@108
   358
	    break;
nkeynes@108
   359
	}
nkeynes@270
   360
	bytes <<= shift;
nkeynes@270
   361
	break;
nkeynes@270
   362
	    
nkeynes@270
   363
    case PVR2_TEX_FORMAT_ARGB1555:
nkeynes@270
   364
	bytes <<= 1;
nkeynes@270
   365
	intFormat = GL_RGB5_A1;
nkeynes@270
   366
	format = GL_RGBA;
nkeynes@270
   367
	type = GL_UNSIGNED_SHORT_1_5_5_5_REV;
nkeynes@270
   368
	break;
nkeynes@270
   369
    case PVR2_TEX_FORMAT_RGB565:
nkeynes@270
   370
	bytes <<= 1;
nkeynes@270
   371
	intFormat = GL_RGB;
nkeynes@270
   372
	format = GL_RGB;
nkeynes@270
   373
	type = GL_UNSIGNED_SHORT_5_6_5_REV;
nkeynes@270
   374
	break;
nkeynes@270
   375
    case PVR2_TEX_FORMAT_ARGB4444:
nkeynes@270
   376
	bytes <<= 1;
nkeynes@270
   377
	intFormat = GL_RGBA4;
nkeynes@270
   378
	format = GL_BGRA;
nkeynes@270
   379
	type = GL_UNSIGNED_SHORT_4_4_4_4_REV;
nkeynes@270
   380
	break;
nkeynes@270
   381
    case PVR2_TEX_FORMAT_YUV422:
nkeynes@282
   382
	bytes <<= 2;
nkeynes@282
   383
	intFormat = GL_RGBA8;
nkeynes@282
   384
	format = GL_BGRA;
nkeynes@282
   385
	type = GL_UNSIGNED_INT_8_8_8_8_REV;
nkeynes@270
   386
	break;
nkeynes@270
   387
    case PVR2_TEX_FORMAT_BUMPMAP:
nkeynes@270
   388
	ERROR( "Bumpmap not supported" );
nkeynes@270
   389
	break;
nkeynes@270
   390
    }
nkeynes@270
   391
	
nkeynes@270
   392
    int level=0, last_level = 0, mip_width = width, mip_height = height, mip_bytes = bytes;
nkeynes@270
   393
    if( PVR2_TEX_IS_MIPMAPPED(mode) ) {
nkeynes@270
   394
	int i;
nkeynes@270
   395
	for( i=0; 1<<(i+1) < width; i++ );
nkeynes@270
   396
	last_level = i;
nkeynes@270
   397
	mip_width = width >> i;
nkeynes@270
   398
	mip_height= height >> i;
nkeynes@270
   399
	mip_bytes = bytes >> (i*2);
nkeynes@270
   400
	filter = GL_LINEAR_MIPMAP_LINEAR;
nkeynes@270
   401
    }
nkeynes@108
   402
nkeynes@270
   403
    if( PVR2_TEX_IS_COMPRESSED(mode) ) {
nkeynes@270
   404
	uint16_t tmp[VQ_CODEBOOK_SIZE];
nkeynes@270
   405
	pvr2_vram64_read( (char *)tmp, texture_addr, VQ_CODEBOOK_SIZE );
nkeynes@270
   406
	texture_addr += VQ_CODEBOOK_SIZE;
nkeynes@270
   407
	vq_get_codebook( &codebook, tmp );
nkeynes@270
   408
    }
nkeynes@270
   409
nkeynes@270
   410
    for( level=last_level; level>= 0; level-- ) {
nkeynes@270
   411
	char data[mip_bytes];
nkeynes@270
   412
	/* load data from image, detwiddling/uncompressing as required */
nkeynes@108
   413
	if( tex_format == PVR2_TEX_FORMAT_IDX8 ) {
nkeynes@270
   414
	    int inputlength = mip_bytes >> shift;
nkeynes@108
   415
	    int bank = (mode >> 25) &0x03;
nkeynes@108
   416
	    char *palette = mmio_region_PVR2PAL.mem + (bank * (256 << shift));
nkeynes@270
   417
	    char tmp[inputlength];
nkeynes@270
   418
	    char *p = tmp;
nkeynes@270
   419
	    pvr2_vram64_read( tmp, texture_addr, inputlength );
nkeynes@113
   420
	    if( shift == 2 ) {
nkeynes@270
   421
		detwiddle_pal8_to_32( 0, 0, mip_width, mip_width, &p, 
nkeynes@113
   422
				      (uint32_t *)data, (uint32_t *)palette );
nkeynes@113
   423
	    } else {
nkeynes@270
   424
		detwiddle_pal8_to_16( 0, 0, mip_width, mip_width, &p,
nkeynes@129
   425
				      (uint16_t *)data, (uint16_t *)palette );
nkeynes@108
   426
	    }
nkeynes@282
   427
	} else if( tex_format == PVR2_TEX_FORMAT_YUV422 ) {
nkeynes@282
   428
	    int inputlength = ((mip_width*mip_height)<<1);
nkeynes@282
   429
	    char tmp[inputlength];
nkeynes@282
   430
	    pvr2_vram64_read( tmp, texture_addr, inputlength );
nkeynes@282
   431
	    yuv_decode( mip_width, mip_height, tmp, (uint32_t *)&data );
nkeynes@270
   432
	} else if( PVR2_TEX_IS_COMPRESSED(mode) ) {
nkeynes@270
   433
	    int inputlength = ((mip_width*mip_height) >> 2);
nkeynes@270
   434
	    char tmp[inputlength];
nkeynes@270
   435
	    pvr2_vram64_read( tmp, texture_addr, inputlength );
nkeynes@270
   436
	    vq_decode( mip_width, mip_height, tmp, (uint16_t *)&data, &codebook, 
nkeynes@270
   437
		       PVR2_TEX_IS_TWIDDLED(mode) );
nkeynes@270
   438
	} else if( PVR2_TEX_IS_TWIDDLED(mode) ) {
nkeynes@270
   439
	    char tmp[mip_bytes];
nkeynes@270
   440
	    uint16_t *p = (uint16_t *)tmp;
nkeynes@270
   441
	    pvr2_vram64_read( tmp, texture_addr, mip_bytes );
nkeynes@270
   442
	    /* Untwiddle */
nkeynes@270
   443
	    detwiddle_16_to_16( 0, 0, mip_width, mip_width, &p, (uint16_t *)&data );
nkeynes@270
   444
	} else {
nkeynes@270
   445
	    pvr2_vram64_read( data, texture_addr, mip_bytes );
nkeynes@108
   446
	}
nkeynes@270
   447
	    
nkeynes@270
   448
	if( PVR2_TEX_IS_MIPMAPPED(mode) && mip_width == 2 ) {
nkeynes@270
   449
	    /* Opengl requires a 1x1 texture, but the PVR2 doesn't. This should
nkeynes@270
   450
	     * strictly speaking be the average of the 2x2 texture, but we're
nkeynes@270
   451
	     * lazy at the moment */
nkeynes@270
   452
	    glTexImage2D( GL_TEXTURE_2D, level+1, intFormat, 1, 1, 0, format, type, data );
nkeynes@108
   453
	}
nkeynes@108
   454
nkeynes@108
   455
	/* Pass to GL */
nkeynes@270
   456
	glTexImage2D( GL_TEXTURE_2D, level, intFormat, mip_width, mip_height, 0, format, type,
nkeynes@108
   457
		      data );
nkeynes@270
   458
	texture_addr += mip_bytes;
nkeynes@270
   459
	mip_width <<= 1;
nkeynes@270
   460
	mip_height <<= 1;
nkeynes@270
   461
	mip_bytes <<= 2;
nkeynes@103
   462
    }
nkeynes@270
   463
nkeynes@270
   464
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter);
nkeynes@108
   465
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nkeynes@103
   466
}
nkeynes@103
   467
nkeynes@103
   468
/**
nkeynes@103
   469
 * Return a texture ID for the texture specified at the supplied address
nkeynes@103
   470
 * and given parameters (the same sequence of bytes could in theory have
nkeynes@103
   471
 * multiple interpretations). We use the texture address as the primary
nkeynes@103
   472
 * index, but allow for multiple instances at each address. The texture
nkeynes@103
   473
 * will be bound to the GL_TEXTURE_2D target before being returned.
nkeynes@103
   474
 * 
nkeynes@103
   475
 * If the texture has already been bound, return the ID to which it was
nkeynes@103
   476
 * bound. Otherwise obtain an unused texture ID and set it up appropriately.
nkeynes@103
   477
 */
nkeynes@103
   478
GLuint texcache_get_texture( uint32_t texture_addr, int width, int height,
nkeynes@103
   479
			     int mode )
nkeynes@103
   480
{
nkeynes@103
   481
    uint32_t texture_page = texture_addr >> 12;
nkeynes@103
   482
    texcache_entry_index idx = texcache_page_lookup[texture_page];
nkeynes@103
   483
    while( idx != EMPTY_ENTRY ) {
nkeynes@103
   484
	texcache_entry_t entry = &texcache_active_list[idx];
nkeynes@103
   485
	if( entry->texture_addr == texture_addr &&
nkeynes@103
   486
	    entry->mode == mode &&
nkeynes@103
   487
	    entry->width == width &&
nkeynes@103
   488
	    entry->height == height ) {
nkeynes@103
   489
	    entry->lru_count = texcache_ref_counter++;
nkeynes@103
   490
	    glBindTexture( GL_TEXTURE_2D, entry->texture_id );
nkeynes@103
   491
	    return entry->texture_id;
nkeynes@103
   492
	}
nkeynes@103
   493
        idx = entry->next;
nkeynes@103
   494
    }
nkeynes@103
   495
nkeynes@103
   496
    /* Not found - check the free list */
nkeynes@103
   497
    int slot = 0;
nkeynes@103
   498
nkeynes@103
   499
    if( texcache_free_ptr < MAX_TEXTURES ) {
nkeynes@103
   500
	slot = texcache_free_list[texcache_free_ptr++];
nkeynes@103
   501
    } else {
nkeynes@103
   502
	slot = texcache_evict();
nkeynes@103
   503
    }
nkeynes@103
   504
nkeynes@103
   505
    /* Construct new entry */
nkeynes@103
   506
    texcache_active_list[slot].texture_addr = texture_addr;
nkeynes@103
   507
    texcache_active_list[slot].width = width;
nkeynes@103
   508
    texcache_active_list[slot].height = height;
nkeynes@103
   509
    texcache_active_list[slot].mode = mode;
nkeynes@103
   510
    texcache_active_list[slot].lru_count = texcache_ref_counter++;
nkeynes@103
   511
nkeynes@103
   512
    /* Add entry to the lookup table */
nkeynes@103
   513
    texcache_active_list[slot].next = texcache_page_lookup[texture_page];
nkeynes@103
   514
    texcache_page_lookup[texture_page] = slot;
nkeynes@103
   515
nkeynes@103
   516
    /* Construct the GL texture */
nkeynes@108
   517
    glBindTexture( GL_TEXTURE_2D, texcache_active_list[slot].texture_id );
nkeynes@103
   518
    texcache_load_texture( texture_addr, width, height, mode );
nkeynes@103
   519
    
nkeynes@103
   520
    return texcache_active_list[slot].texture_id;
nkeynes@103
   521
}
.