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lxdream.org :: lxdream/src/pvr2/tacore.c
lxdream 0.9.1
released Jun 29
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filename src/pvr2/tacore.c
changeset 199:4433d9c1638c
prev198:627220aa0e3b
next200:c3bdcd373b6d
author nkeynes
date Sun Aug 06 03:50:36 2006 +0000 (13 years ago)
permissions -rw-r--r--
last change Handle NAN vertexes "correctly" (TA treats them as +/- INF)
file annotate diff log raw
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/**
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 * $Id: tacore.c,v 1.5 2006-08-06 03:50:36 nkeynes Exp $
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 *
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 * PVR2 Tile Accelerator implementation
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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 "pvr2.h"
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#include "asic.h"
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#define STATE_IDLE                 0
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#define STATE_IN_LIST              1
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#define STATE_IN_POLYGON           2
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#define STATE_EXPECT_POLY_BLOCK2   3
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#define STATE_EXPECT_VERTEX_BLOCK2 4
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#define STATE_ERROR                5
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#define STATE_EXPECT_END_VERTEX_BLOCK2 7
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#define TA_CMD(i) ( (i) >> 29 )
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#define TA_CMD_END_LIST 0
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#define TA_CMD_CLIP 1
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#define TA_CMD_POLYGON_CONTEXT 4
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#define TA_CMD_SPRITE_CONTEXT 5
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#define TA_CMD_VERTEX 7
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#define TA_LIST_NONE -1
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#define TA_LIST_OPAQUE 0
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#define TA_LIST_OPAQUE_MOD 1
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#define TA_LIST_TRANS 2
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#define TA_LIST_TRANS_MOD 3
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#define TA_LIST_PUNCH_OUT 4
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#define TA_IS_MODIFIER_LIST(list) (list == TA_LIST_OPAQUE_MOD || list == TA_LIST_TRANS_MOD)
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#define TA_GROW_UP 0
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#define TA_GROW_DOWN 1
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#define TA_VERTEX_NONE                        -1
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#define TA_VERTEX_PACKED                      0x00
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#define TA_VERTEX_TEX_PACKED                  0x08
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#define TA_VERTEX_TEX_SPEC_PACKED             0x0C
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#define TA_VERTEX_TEX_UV16_PACKED             0x09
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#define TA_VERTEX_TEX_UV16_SPEC_PACKED        0x0D
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#define TA_VERTEX_FLOAT                       0x10
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#define TA_VERTEX_TEX_FLOAT                   0x18
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#define TA_VERTEX_TEX_SPEC_FLOAT              0x1C
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#define TA_VERTEX_TEX_UV16_FLOAT              0x19
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#define TA_VERTEX_TEX_UV16_SPEC_FLOAT         0x1D
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#define TA_VERTEX_INTENSITY                   0x20
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#define TA_VERTEX_TEX_INTENSITY               0x28
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#define TA_VERTEX_TEX_SPEC_INTENSITY          0x2C
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#define TA_VERTEX_TEX_UV16_INTENSITY          0x29
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#define TA_VERTEX_TEX_UV16_SPEC_INTENSITY     0x2D
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#define TA_VERTEX_PACKED_MOD                  0x40
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#define TA_VERTEX_TEX_PACKED_MOD              0x48
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#define TA_VERTEX_TEX_SPEC_PACKED_MOD         0x4C
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#define TA_VERTEX_TEX_UV16_PACKED_MOD         0x49
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#define TA_VERTEX_TEX_UV16_SPEC_PACKED_MOD    0x4D
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#define TA_VERTEX_INTENSITY_MOD               0x60
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#define TA_VERTEX_TEX_INTENSITY_MOD           0x68
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#define TA_VERTEX_TEX_SPEC_INTENSITY_MOD      0x6C
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#define TA_VERTEX_TEX_UV16_INTENSITY_MOD      0x69
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#define TA_VERTEX_TEX_UV16_SPEC_INTENSITY_MOD 0x6D
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#define TA_VERTEX_SPRITE                      0x80
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#define TA_VERTEX_TEX_SPRITE                  0x88
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#define TA_VERTEX_MOD_VOLUME                  0x81
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#define TA_IS_NORMAL_POLY() (ta_status.current_vertex_type < TA_VERTEX_SPRITE)
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static int strip_lengths[4] = {3,4,6,8}; /* in vertexes */
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#define TA_POLYCMD_LISTTYPE(i) ( ((i) >> 24) & 0x0F )
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#define TA_POLYCMD_USELENGTH(i) ( i & 0x00800000 )
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#define TA_POLYCMD_LENGTH(i)  strip_lengths[((i >> 18) & 0x03)]
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#define TA_POLYCMD_CLIP(i)  ((i>>16)&0x03)
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#define TA_POLYCMD_COLOURFMT(i)  (i & 0x00000030)
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#define TA_POLYCMD_COLOURFMT_ARGB32 0x00000000
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#define TA_POLYCMD_COLOURFMT_FLOAT 0x00000010
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#define TA_POLYCMD_COLOURFMT_INTENSITY 0x00000020
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#define TA_POLYCMD_COLOURFMT_LASTINT 0x00000030
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#define TA_POLYCMD_MODIFIED 0x00000080
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#define TA_POLYCMD_FULLMOD  0x00000040
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#define TA_POLYCMD_TEXTURED 0x00000008
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#define TA_POLYCMD_SPECULAR 0x00000004
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#define TA_POLYCMD_SHADED 0x00000002
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#define TA_POLYCMD_UV16 0x00000001
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#define TA_POLYCMD_IS_SPECULAR(i) ((i & 0x0000000C)==0x0000000C) /* Only applies to textured polys */
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#define TA_POLYCMD_IS_FULLMOD(i) ((i & 0x000000C0)==0x000000C0)
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#define TA_IS_END_VERTEX(i) (i & 0x10000000)
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/** Note these are not the IEEE 754 definitions - the TA treats NANs
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 * as if they were INFs of the appropriate sign.
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 */
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#define TA_IS_INF(f) (((*((uint32_t *)&f)) & 0xFF800000) == 0x7F800000)
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#define TA_IS_NINF(f) (((*((uint32_t *)&f)) & 0xFF800000) == 0xFF800000)
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#define MIN3( x1, x2, x3 ) ( (x1)<(x2)? ((x1)<(x3)?(x1):(x3)) : ((x2)<(x3)?(x2):(x3)) )
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#define MAX3( x1, x2, x3 ) ( (x1)>(x2)? ((x1)>(x3)?(x1):(x3)) : ((x2)>(x3)?(x2):(x3)) )
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#define TILESLOT( x, y ) (ta_status.current_tile_matrix + (ta_status.current_tile_size * (y * ta_status.width+ x) << 2))
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extern char *video_base;
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#define PVRRAM(addr) (*(uint32_t *)(video_base + ((addr)&PVR2_RAM_MASK)))
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struct pvr2_ta_vertex {
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    float x,y,z;
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    uint32_t detail[8]; /* 0-8 detail words */
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};
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struct tile_bounds {
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    int x1, y1, x2, y2;
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};
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struct pvr2_ta_status {
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    int state;
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    int width, height; /* Tile resolution, ie 20x15 */
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    int tilelist_dir; /* Growth direction of the tilelist, 0 = up, 1 = down */
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    uint32_t tilelist_size; /* Size of the tilelist segments */
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    uint32_t tilelist_start; /* Initial address of the tilelist */
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    int current_vertex_type;
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    gboolean accept_vertexes;
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    int vertex_count; /* index of last start-vertex seen, or -1 if no vertexes 
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			 * are present
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			 */
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    int max_vertex;     /* Maximum number of vertexes in the current polygon (3/4/6/8) */
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    int current_list_type;
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    uint32_t current_tile_matrix; /* Memory location of the first tile for the current list. */
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    uint32_t current_tile_size; /* Size of the tile matrix space  in 32-bit words (0/8/16/32)*/
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    uint32_t intensity1, intensity2;
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    struct tile_bounds clip; 
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    /**
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     * Current working object
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     */
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    int poly_context_size;
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    int poly_vertex_size;
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    int poly_parity;
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    uint32_t poly_context[5];
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    uint32_t poly_pointer;
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    struct tile_bounds last_triangle_bounds;
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    struct pvr2_ta_vertex poly_vertex[8];
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    int debug_output;
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};
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static struct pvr2_ta_status ta_status;
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static int tilematrix_sizes[4] = {0,8,16,32};
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/**
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 * Convenience union - ta data is either 32-bit integer or 32-bit float.
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 */
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union ta_data {
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    unsigned int i;
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    float f;
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};
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void pvr2_ta_reset() {
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    ta_status.state = STATE_ERROR; /* State not valid until initialized */
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    ta_status.debug_output = 0;
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}
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void pvr2_ta_save_state( FILE *f )
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{
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    fwrite( &ta_status, sizeof(ta_status), 1, f );
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}
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int pvr2_ta_load_state( FILE *f )
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{
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    if( fread( &ta_status, sizeof(ta_status), 1, f ) != 1 )
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	return 1;
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    return 0;
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}
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void pvr2_ta_init() {
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    ta_status.state = STATE_IDLE;
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    ta_status.current_list_type = -1;
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    ta_status.current_vertex_type = -1;
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    ta_status.poly_parity = 0;
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    ta_status.vertex_count = 0;
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    ta_status.max_vertex = 3;
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    ta_status.last_triangle_bounds.x1 = -1;
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    ta_status.accept_vertexes = TRUE;
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    ta_status.clip.x1 = 0;
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    ta_status.clip.y1 = 0;
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    uint32_t size = MMIO_READ( PVR2, TA_TILESIZE );
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    ta_status.width = (size & 0xFFFF) + 1;
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    ta_status.height = (size >> 16) + 1;
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    ta_status.clip.x2 = ta_status.width-1;
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    ta_status.clip.y2 = ta_status.height-1;
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    uint32_t control = MMIO_READ( PVR2, TA_TILECFG );
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    ta_status.tilelist_dir = (control >> 20) & 0x01;
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    ta_status.tilelist_size = tilematrix_sizes[ (control & 0x03) ];
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    MMIO_WRITE( PVR2, TA_POLYPOS, MMIO_READ( PVR2, TA_POLYBASE ) );
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    uint32_t plistpos = MMIO_READ( PVR2, TA_LISTBASE ) >> 2;
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    if( ta_status.tilelist_dir == TA_GROW_DOWN ) {
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	plistpos -= ta_status.tilelist_size;
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    }
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    MMIO_WRITE( PVR2, TA_LISTPOS, plistpos );
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    ta_status.tilelist_start = plistpos;
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}
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static uint32_t parse_float_colour( float a, float r, float g, float b ) {
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    return
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    	(((unsigned int)((256 * CLAMP(a,0.0,1.0))-1))<<24) |
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    	(((unsigned int)((256 * CLAMP(r,0.0,1.0))-1))<<16) |
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    	(((unsigned int)((256 * CLAMP(g,0.0,1.0))-1))<<8) |
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    	(((unsigned int)((256 * CLAMP(b,0.0,1.0))-1)));
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}
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static uint32_t parse_intensity_colour( uint32_t base, float intensity )
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{
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    unsigned int i = (unsigned int)(256 * CLAMP(intensity, 0.0,1.0));
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    return
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	(((((base & 0xFF) * i) & 0xFF00) |
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	  (((base & 0xFF00) * i) & 0xFF0000) |
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	  (((base & 0xFF0000) * i) & 0xFF000000)) >> 8) |
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	base & 0xFF000000;
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}
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/**
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 * Initialize the specified TA list.
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 */
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static void ta_init_list( unsigned int listtype ) {
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    int config = MMIO_READ( PVR2, TA_TILECFG );
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    int tile_matrix = MMIO_READ( PVR2, TA_TILEBASE );
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    int list_end = MMIO_READ( PVR2, TA_LISTEND );
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    ta_status.current_tile_matrix = tile_matrix;
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    /* If the list grows down, the end must be < tile matrix start. 
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     * If it grows up, the end must be > tile matrix start.
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     * Don't ask me why, it just does...
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     */
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    if( ((ta_status.tilelist_dir == TA_GROW_DOWN && list_end <= tile_matrix) ||
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	 (ta_status.tilelist_dir == TA_GROW_UP && list_end >= tile_matrix )) &&
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	listtype <= TA_LIST_PUNCH_OUT ) {
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	int i;
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	uint32_t *p;
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	for( i=0; i < listtype; i++ ) {
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	    int size = tilematrix_sizes[(config & 0x03)] << 2;
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	    ta_status.current_tile_matrix += ta_status.width * ta_status.height * size;
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	    config >>= 4;
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	}
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	ta_status.current_tile_size = tilematrix_sizes[(config & 0x03)];
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	/* Initialize each tile to 0xF0000000 */
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	if( ta_status.current_tile_size != 0 ) {
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	    p = (uint32_t *)(video_base + ta_status.current_tile_matrix);
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	    for( i=0; i< ta_status.width * ta_status.height; i++ ) {
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		*p = 0xF0000000;
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		p += ta_status.current_tile_size;
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	    }
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	}
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    } else {
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	ta_status.current_tile_size = 0;
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    }
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    if( tile_matrix == list_end ) {
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	ta_status.current_tile_size = 0;
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    }
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    ta_status.state = STATE_IN_LIST;
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    ta_status.current_list_type = listtype;
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    ta_status.last_triangle_bounds.x1 = -1;
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}
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static int list_events[5] = {EVENT_PVR_OPAQUE_DONE, EVENT_PVR_OPAQUEMOD_DONE, 
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			     EVENT_PVR_TRANS_DONE, EVENT_PVR_TRANSMOD_DONE,
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			     EVENT_PVR_PUNCHOUT_DONE };
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static void ta_end_list() {
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    if( ta_status.current_list_type != TA_LIST_NONE ) {
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	asic_event( list_events[ta_status.current_list_type] );
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	if( ta_status.state == STATE_IN_POLYGON ) {
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	    asic_event( EVENT_TA_ERROR );
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	    asic_event( EVENT_PVR_BAD_INPUT );
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	}
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	ta_status.current_list_type = TA_LIST_NONE;
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	ta_status.current_vertex_type = -1;
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	ta_status.state = STATE_IDLE;
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    }
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}
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/**
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 * Write data out to the polygon buffer.
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 * If the end-of-buffer is reached, asserts EVENT_PVR_PRIM_ALLOC_FAIL
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 * @param data to be written
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 * @param length Number of 32-bit words to write.
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 * @return number of words actually written
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 */
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static int ta_write_polygon_buffer( uint32_t *data, int length )
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{
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    int rv;
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    int posn = MMIO_READ( PVR2, TA_POLYPOS );
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    int end = MMIO_READ( PVR2, TA_POLYEND );
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    uint32_t *target = (uint32_t *)(video_base + posn);
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    for( rv=0; rv < length; rv++ ) {
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	if( posn == end ) {
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	    asic_event( EVENT_PVR_PRIM_ALLOC_FAIL );
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	    asic_event( EVENT_TA_ERROR );
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	    //	    ta_status.state = STATE_ERROR;
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	    break;
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	}
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	*target++ = *data++;
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	posn += 4;
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    }
nkeynes@189
   321
nkeynes@189
   322
    MMIO_WRITE( PVR2, TA_POLYPOS, posn );
nkeynes@189
   323
    return rv;
nkeynes@189
   324
}
nkeynes@189
   325
nkeynes@193
   326
#define TA_NO_ALLOC 0xFFFFFFFF
nkeynes@193
   327
nkeynes@189
   328
/**
nkeynes@193
   329
 * Allocate a new tile list block from the grow space and update the
nkeynes@193
   330
 * word at reference to be a link to the new block.
nkeynes@189
   331
 */
nkeynes@193
   332
static uint32_t ta_alloc_tilelist( uint32_t reference ) {
nkeynes@189
   333
    uint32_t posn = MMIO_READ( PVR2, TA_LISTPOS );
nkeynes@193
   334
    uint32_t limit = MMIO_READ( PVR2, TA_LISTEND ) >> 2;
nkeynes@189
   335
    uint32_t newposn;
nkeynes@193
   336
    uint32_t result;
nkeynes@189
   337
    if( ta_status.tilelist_dir == TA_GROW_DOWN ) {
nkeynes@189
   338
	newposn = posn - ta_status.tilelist_size;
nkeynes@193
   339
	if( posn == limit ) {
nkeynes@193
   340
	    PVRRAM(posn<<2) = 0xF0000000;
nkeynes@193
   341
	    PVRRAM(reference) = 0xE0000000 | (posn<<2);
nkeynes@193
   342
	    return TA_NO_ALLOC;
nkeynes@193
   343
	} else if( posn < limit ) {
nkeynes@193
   344
	    PVRRAM(reference) = 0xE0000000 | (posn<<2);
nkeynes@193
   345
	    return TA_NO_ALLOC;
nkeynes@193
   346
	} else if( newposn <= limit ) {
nkeynes@193
   347
	} else if( newposn <= (limit + ta_status.tilelist_size) ) {
nkeynes@193
   348
	    asic_event( EVENT_TA_ERROR );
nkeynes@193
   349
	    asic_event( EVENT_PVR_MATRIX_ALLOC_FAIL );
nkeynes@193
   350
	    MMIO_WRITE( PVR2, TA_LISTPOS, newposn );
nkeynes@193
   351
	} else {
nkeynes@193
   352
	    MMIO_WRITE( PVR2, TA_LISTPOS, newposn );
nkeynes@193
   353
	}
nkeynes@193
   354
	PVRRAM(reference) = 0xE0000000 | (posn<<2);
nkeynes@193
   355
	return posn << 2;
nkeynes@189
   356
    } else {
nkeynes@189
   357
	newposn = posn + ta_status.tilelist_size;
nkeynes@193
   358
	if( posn == limit ) {
nkeynes@193
   359
	    PVRRAM(posn<<2) = 0xF0000000;
nkeynes@193
   360
	    PVRRAM(reference) = 0xE0000000 | (posn<<2);
nkeynes@193
   361
	    return TA_NO_ALLOC;
nkeynes@193
   362
	} else if ( posn > limit ) {
nkeynes@193
   363
	    PVRRAM(reference) = 0xE0000000 | (posn<<2);
nkeynes@193
   364
	    return TA_NO_ALLOC;
nkeynes@193
   365
	} else if( newposn >= limit ) {
nkeynes@193
   366
	} else if( newposn >= (limit - ta_status.tilelist_size) ) {
nkeynes@193
   367
	    asic_event( EVENT_TA_ERROR );
nkeynes@193
   368
	    asic_event( EVENT_PVR_MATRIX_ALLOC_FAIL );
nkeynes@193
   369
	    MMIO_WRITE( PVR2, TA_LISTPOS, newposn );
nkeynes@193
   370
	} else {
nkeynes@193
   371
	    MMIO_WRITE( PVR2, TA_LISTPOS, newposn );
nkeynes@193
   372
	}	    
nkeynes@193
   373
	PVRRAM(reference) = 0xE0000000 | (posn<<2);
nkeynes@193
   374
	return posn << 2;
nkeynes@189
   375
    }
nkeynes@189
   376
}
nkeynes@189
   377
nkeynes@189
   378
/**
nkeynes@189
   379
 * Write a tile entry out to the matrix.
nkeynes@189
   380
 */
nkeynes@189
   381
static int ta_write_tile_entry( int x, int y, uint32_t tile_entry ) {
nkeynes@189
   382
    uint32_t tile = TILESLOT(x,y);
nkeynes@193
   383
    uint32_t tilestart = tile;
nkeynes@189
   384
    uint32_t value;
nkeynes@189
   385
    uint32_t lasttri = 0;
nkeynes@189
   386
    int i,l;
nkeynes@189
   387
nkeynes@189
   388
    if( (tile_entry & 0x80000000) && 
nkeynes@189
   389
	ta_status.last_triangle_bounds.x1 != -1 &&
nkeynes@189
   390
	ta_status.last_triangle_bounds.x1 <= x &&
nkeynes@189
   391
	ta_status.last_triangle_bounds.x2 >= x &&
nkeynes@189
   392
	ta_status.last_triangle_bounds.y1 <= y &&
nkeynes@189
   393
	ta_status.last_triangle_bounds.y2 >= y ) {
nkeynes@189
   394
	/* potential for triangle stacking */
nkeynes@189
   395
	lasttri = tile_entry & 0xE1E00000;
nkeynes@189
   396
    }
nkeynes@189
   397
    
nkeynes@189
   398
    
nkeynes@189
   399
    if( PVRRAM(tile) == 0xF0000000 ) {
nkeynes@189
   400
	PVRRAM(tile) = tile_entry;
nkeynes@189
   401
	PVRRAM(tile+4) = 0xF0000000;
nkeynes@189
   402
	return;
nkeynes@189
   403
    }
nkeynes@189
   404
nkeynes@189
   405
    while(1) {
nkeynes@189
   406
	value = PVRRAM(tile);
nkeynes@189
   407
	for( i=1; i<ta_status.current_tile_size; i++ ) {
nkeynes@189
   408
	    tile += 4;
nkeynes@189
   409
	    uint32_t nextval = PVRRAM(tile);
nkeynes@189
   410
	    if( nextval == 0xF0000000 ) {
nkeynes@189
   411
		if( lasttri != 0 && lasttri == (value&0xE1E00000) ) {
nkeynes@189
   412
		    int count = (value & 0x1E000000) + 0x02000000;
nkeynes@189
   413
		    if( count < 0x20000000 ) {
nkeynes@189
   414
			PVRRAM(tile-4) = (value & 0xE1FFFFFF) | count;
nkeynes@189
   415
			return;
nkeynes@189
   416
		    }
nkeynes@189
   417
		}
nkeynes@189
   418
		if( i < ta_status.current_tile_size-1 ) {
nkeynes@189
   419
		    PVRRAM(tile) = tile_entry;
nkeynes@189
   420
		    PVRRAM(tile+4) = 0xF0000000;
nkeynes@189
   421
		    return;
nkeynes@189
   422
		}
nkeynes@189
   423
	    }
nkeynes@189
   424
	    value = nextval;
nkeynes@189
   425
	}
nkeynes@189
   426
nkeynes@189
   427
	if( value == 0xF0000000 ) {
nkeynes@193
   428
	    tile = ta_alloc_tilelist(tile);
nkeynes@193
   429
	    if( tile != TA_NO_ALLOC ) {
nkeynes@193
   430
		PVRRAM(tile) = tile_entry;
nkeynes@193
   431
		PVRRAM(tile+4) = 0xF0000000;
nkeynes@193
   432
	    }
nkeynes@189
   433
	    return;
nkeynes@189
   434
	} else if( (value & 0xFF000000) == 0xE0000000 ) {
nkeynes@193
   435
	    value &= 0x00FFFFFF;
nkeynes@193
   436
	    if( value == tilestart )
nkeynes@193
   437
		return 0; /* Loop */
nkeynes@193
   438
	    tilestart = tile = value;
nkeynes@189
   439
	} else {
nkeynes@189
   440
	    /* This should never happen */
nkeynes@189
   441
	    return 0;
nkeynes@189
   442
	}
nkeynes@189
   443
    }
nkeynes@189
   444
}
nkeynes@189
   445
nkeynes@189
   446
/**
nkeynes@189
   447
 * Write a completed polygon out to the memory buffers 
nkeynes@189
   448
 * OPTIMIZEME: This is not terribly efficient at the moment.
nkeynes@189
   449
 */
nkeynes@189
   450
static void ta_commit_polygon( ) {
nkeynes@189
   451
    int i, x, y;
nkeynes@189
   452
    int tx[ta_status.vertex_count], ty[ta_status.vertex_count];
nkeynes@189
   453
    struct tile_bounds triangle_bound[ta_status.vertex_count - 2];
nkeynes@189
   454
    struct tile_bounds polygon_bound;
nkeynes@189
   455
    uint32_t poly_context[5];
nkeynes@189
   456
nkeynes@189
   457
    if( ta_status.vertex_count < 2 ) {
nkeynes@189
   458
	return; /* No polygons - ignore */
nkeynes@189
   459
    }
nkeynes@189
   460
    memcpy( poly_context, ta_status.poly_context, ta_status.poly_context_size * 4 );
nkeynes@189
   461
nkeynes@189
   462
    /* Compute the tile coordinates for each vertex (need to be careful with
nkeynes@189
   463
     * clamping here)
nkeynes@189
   464
     */
nkeynes@189
   465
    for( i=0; i<ta_status.vertex_count; i++ ) {
nkeynes@199
   466
	if( ta_status.poly_vertex[i].x < 0.0 || TA_IS_NINF(ta_status.poly_vertex[i].x) ) {
nkeynes@189
   467
	    tx[i] = -1;
nkeynes@199
   468
	} else if( ta_status.poly_vertex[i].x > (float)INT_MAX || TA_IS_INF(ta_status.poly_vertex[i].x) ) {
nkeynes@189
   469
	    tx[i] = INT_MAX/32;
nkeynes@189
   470
	} else {
nkeynes@189
   471
	    tx[i] = (int)(ta_status.poly_vertex[i].x / 32.0);
nkeynes@189
   472
	}
nkeynes@199
   473
	if( ta_status.poly_vertex[i].y < 0.0 || TA_IS_NINF(ta_status.poly_vertex[i].y)) {
nkeynes@189
   474
	    ty[i] = -1;
nkeynes@199
   475
	} else if( ta_status.poly_vertex[i].y > (float)INT_MAX || TA_IS_INF(ta_status.poly_vertex[i].y) ) {
nkeynes@189
   476
	    ty[i] = INT_MAX/32;
nkeynes@189
   477
	} else {
nkeynes@189
   478
	    ty[i] = (int)(ta_status.poly_vertex[i].y / 32.0);
nkeynes@189
   479
	}
nkeynes@189
   480
	
nkeynes@189
   481
    }
nkeynes@189
   482
nkeynes@189
   483
    /* Compute bounding box for each triangle individually, as well
nkeynes@189
   484
     * as the overall polygon.
nkeynes@189
   485
     */
nkeynes@189
   486
nkeynes@189
   487
    for( i=0; i<ta_status.vertex_count-2; i++ ) {
nkeynes@189
   488
	triangle_bound[i].x1 = MIN3(tx[i],tx[i+1],tx[i+2]);
nkeynes@189
   489
	triangle_bound[i].x2 = MAX3(tx[i],tx[i+1],tx[i+2]);
nkeynes@189
   490
	triangle_bound[i].y1 = MIN3(ty[i],ty[i+1],ty[i+2]);
nkeynes@189
   491
	triangle_bound[i].y2 = MAX3(ty[i],ty[i+1],ty[i+2]);
nkeynes@189
   492
	if( i == 0 ) {
nkeynes@189
   493
	    polygon_bound.x1 = triangle_bound[0].x1;
nkeynes@189
   494
	    polygon_bound.y1 = triangle_bound[0].y1;
nkeynes@189
   495
	    polygon_bound.x2 = triangle_bound[0].x2;
nkeynes@189
   496
	    polygon_bound.y2 = triangle_bound[0].y2;
nkeynes@189
   497
	} else {
nkeynes@189
   498
	    polygon_bound.x1 = MIN(polygon_bound.x1, triangle_bound[i].x1);
nkeynes@189
   499
	    polygon_bound.x2 = MAX(polygon_bound.x2, triangle_bound[i].x2);
nkeynes@189
   500
	    polygon_bound.y1 = MIN(polygon_bound.y1, triangle_bound[i].y1);
nkeynes@189
   501
	    polygon_bound.y2 = MAX(polygon_bound.y2, triangle_bound[i].y2);
nkeynes@189
   502
	}
nkeynes@189
   503
    }
nkeynes@189
   504
nkeynes@189
   505
    /* If the polygon is actually entirely out of the frustum, clip it entirely */
nkeynes@189
   506
    if( polygon_bound.x2 < 0 || polygon_bound.x1 > ta_status.width ||
nkeynes@189
   507
	polygon_bound.y2 < 0 || polygon_bound.y1 > ta_status.height ) {
nkeynes@189
   508
	return;
nkeynes@189
   509
    }
nkeynes@189
   510
nkeynes@189
   511
    /* Clamp the polygon bounds to the frustum */
nkeynes@189
   512
    if( polygon_bound.x1 < 0 ) polygon_bound.x1 = 0;
nkeynes@189
   513
    if( polygon_bound.x2 >= ta_status.width ) polygon_bound.x2 = ta_status.width-1;
nkeynes@189
   514
    if( polygon_bound.y1 < 0 ) polygon_bound.y1 = 0;
nkeynes@189
   515
    if( polygon_bound.y2 >= ta_status.width ) polygon_bound.y2 = ta_status.height-1;
nkeynes@189
   516
nkeynes@189
   517
    /* Set the "single tile" flag if it's entirely contained in 1 tile */
nkeynes@189
   518
    if( polygon_bound.x1 == polygon_bound.x2 &&
nkeynes@189
   519
	polygon_bound.y1 == polygon_bound.y2 ) {
nkeynes@189
   520
	poly_context[0] |= 0x00200000;
nkeynes@189
   521
    }
nkeynes@189
   522
nkeynes@189
   523
    /* Ok, we're good to go - write out the polygon first */
nkeynes@189
   524
    uint32_t tile_entry = MMIO_READ( PVR2, TA_POLYPOS ) >> 2 | ta_status.poly_pointer;
nkeynes@189
   525
    
nkeynes@189
   526
    int status = ta_write_polygon_buffer( poly_context, ta_status.poly_context_size );
nkeynes@189
   527
    if( status == 0 ) {
nkeynes@189
   528
	/* No memory available - abort */
nkeynes@189
   529
	return;
nkeynes@189
   530
    } else {
nkeynes@189
   531
	for( i=0; i<ta_status.vertex_count && status != 0; i++ ) {
nkeynes@189
   532
	    status = ta_write_polygon_buffer( (uint32_t *)(&ta_status.poly_vertex[i]), 3 + ta_status.poly_vertex_size );
nkeynes@189
   533
	}
nkeynes@189
   534
    }
nkeynes@189
   535
nkeynes@193
   536
    if( ta_status.current_tile_size == 0 ) {
nkeynes@193
   537
	/* No memory for tile entry, so don't write anything */
nkeynes@193
   538
	return;
nkeynes@193
   539
    }
nkeynes@193
   540
nkeynes@189
   541
    /* And now the tile entries. Triangles are different from everything else */
nkeynes@189
   542
    if( ta_status.vertex_count == 3 ) {
nkeynes@189
   543
	tile_entry |= 0x80000000;
nkeynes@189
   544
	for( y=polygon_bound.y1; y<=polygon_bound.y2; y++ ) {
nkeynes@189
   545
	    for( x=polygon_bound.x1; x<=polygon_bound.x2; x++ ) {
nkeynes@189
   546
		ta_write_tile_entry( x,y,tile_entry );
nkeynes@189
   547
	    }
nkeynes@189
   548
	}
nkeynes@189
   549
	ta_status.last_triangle_bounds.x1 = polygon_bound.x1;
nkeynes@189
   550
	ta_status.last_triangle_bounds.y1 = polygon_bound.y1;
nkeynes@189
   551
	ta_status.last_triangle_bounds.x2 = polygon_bound.x2;
nkeynes@189
   552
	ta_status.last_triangle_bounds.y2 = polygon_bound.y2;
nkeynes@189
   553
    } else if( ta_status.current_vertex_type == TA_VERTEX_SPRITE ||
nkeynes@189
   554
	       ta_status.current_vertex_type == TA_VERTEX_TEX_SPRITE ) {
nkeynes@189
   555
	tile_entry |= 0xA0000000;
nkeynes@189
   556
	for( y=polygon_bound.y1; y<=polygon_bound.y2; y++ ) {
nkeynes@189
   557
	    for( x=polygon_bound.x1; x<=polygon_bound.x2; x++ ) {
nkeynes@189
   558
		ta_write_tile_entry( x,y,tile_entry );
nkeynes@189
   559
	    }
nkeynes@189
   560
	}
nkeynes@189
   561
	ta_status.last_triangle_bounds.x1 = polygon_bound.x1;
nkeynes@189
   562
	ta_status.last_triangle_bounds.y1 = polygon_bound.y1;
nkeynes@189
   563
	ta_status.last_triangle_bounds.x2 = polygon_bound.x2;
nkeynes@189
   564
	ta_status.last_triangle_bounds.y2 = polygon_bound.y2;
nkeynes@189
   565
    } else {
nkeynes@189
   566
	for( y=polygon_bound.y1; y<=polygon_bound.y2; y++ ) {
nkeynes@189
   567
	    for( x=polygon_bound.x1; x<=polygon_bound.x2; x++ ) {
nkeynes@189
   568
		uint32_t entry = tile_entry;
nkeynes@189
   569
		for( i=0; i<ta_status.vertex_count-2; i++ ) {
nkeynes@189
   570
		    if( triangle_bound[i].x1 <= x && triangle_bound[i].x2 >= x &&
nkeynes@189
   571
			triangle_bound[i].y1 <= y && triangle_bound[i].y2 >= y ) {
nkeynes@189
   572
			entry |= (0x40000000>>i);
nkeynes@189
   573
		    }
nkeynes@189
   574
		}
nkeynes@189
   575
		ta_write_tile_entry( x, y, entry );
nkeynes@189
   576
	    }
nkeynes@189
   577
	}
nkeynes@189
   578
	ta_status.last_triangle_bounds.x1 = -1;
nkeynes@189
   579
    }
nkeynes@189
   580
}
nkeynes@189
   581
nkeynes@189
   582
/**
nkeynes@189
   583
 * Variant of ta_split_polygon called when vertex_count == max_vertex, but 
nkeynes@189
   584
 * the client hasn't sent the LAST VERTEX flag. Commit the poly as normal
nkeynes@189
   585
 * first, then start a new poly with the first 2 vertexes taken from the 
nkeynes@189
   586
 * current one.
nkeynes@189
   587
 */
nkeynes@189
   588
static void ta_split_polygon() {
nkeynes@189
   589
    ta_commit_polygon();
nkeynes@189
   590
    if( TA_IS_NORMAL_POLY() ) { 
nkeynes@189
   591
	/* This only applies to ordinary polys - Sprites + modifier lists are
nkeynes@189
   592
	 * handled differently
nkeynes@189
   593
	 */
nkeynes@189
   594
	if( ta_status.vertex_count == 3 ) {
nkeynes@189
   595
	    /* Triangles use an odd/even scheme */
nkeynes@189
   596
	    if( ta_status.poly_parity == 0 ) {
nkeynes@189
   597
		memcpy( &ta_status.poly_vertex[0], &ta_status.poly_vertex[2], 
nkeynes@189
   598
			sizeof(struct pvr2_ta_vertex) );
nkeynes@189
   599
		ta_status.poly_parity = 1;
nkeynes@189
   600
	    } else {
nkeynes@189
   601
		memcpy( &ta_status.poly_vertex[1], &ta_status.poly_vertex[2],
nkeynes@189
   602
			sizeof(struct pvr2_ta_vertex) );
nkeynes@189
   603
		ta_status.poly_parity = 0;
nkeynes@189
   604
	    }
nkeynes@189
   605
	} else {
nkeynes@189
   606
	    /* Everything else just uses the last 2 vertexes in order */
nkeynes@189
   607
	    memcpy( &ta_status.poly_vertex[0], &ta_status.poly_vertex[ta_status.vertex_count-2], 
nkeynes@189
   608
		    sizeof(struct pvr2_ta_vertex)*2 );
nkeynes@189
   609
	    ta_status.poly_parity = 0;
nkeynes@189
   610
	}
nkeynes@189
   611
	ta_status.vertex_count = 2;
nkeynes@189
   612
    } else {
nkeynes@189
   613
	ta_status.vertex_count = 0;
nkeynes@189
   614
    }
nkeynes@189
   615
}
nkeynes@189
   616
nkeynes@189
   617
/**
nkeynes@189
   618
 * Parse the polygon context block and setup the internal state to receive
nkeynes@189
   619
 * vertexes.
nkeynes@189
   620
 * @param data 32 bytes of parameter data.
nkeynes@189
   621
 */
nkeynes@189
   622
static void ta_parse_polygon_context( union ta_data *data ) {
nkeynes@189
   623
    int colourfmt = TA_POLYCMD_COLOURFMT(data[0].i);
nkeynes@194
   624
    if( TA_POLYCMD_USELENGTH(data[0].i) ) {
nkeynes@194
   625
	ta_status.max_vertex = TA_POLYCMD_LENGTH(data[0].i);
nkeynes@194
   626
    }
nkeynes@189
   627
    ta_status.vertex_count = 0;
nkeynes@189
   628
    ta_status.poly_context[0] = 
nkeynes@189
   629
	(data[1].i & 0xFC1FFFFF) | ((data[0].i & 0x0B) << 22);
nkeynes@189
   630
    ta_status.poly_context[1] = data[2].i;
nkeynes@189
   631
    ta_status.poly_context[3] = data[4].i;
nkeynes@189
   632
    ta_status.poly_parity = 0;
nkeynes@189
   633
    if( data[0].i & TA_POLYCMD_TEXTURED ) {
nkeynes@189
   634
	ta_status.current_vertex_type = data[0].i & 0x0D;
nkeynes@189
   635
	ta_status.poly_context[2] = data[3].i;
nkeynes@189
   636
	ta_status.poly_context[4] = data[5].i;
nkeynes@189
   637
	if( data[0].i & TA_POLYCMD_SPECULAR ) {
nkeynes@189
   638
	    ta_status.poly_context[0] |= 0x01000000;
nkeynes@189
   639
	    ta_status.poly_vertex_size = 4;
nkeynes@189
   640
	} else {
nkeynes@189
   641
	    ta_status.poly_vertex_size = 3;
nkeynes@189
   642
	}
nkeynes@189
   643
	if( data[0].i & TA_POLYCMD_UV16 ) {
nkeynes@189
   644
	    ta_status.poly_vertex_size--;
nkeynes@189
   645
	}
nkeynes@189
   646
    } else {
nkeynes@189
   647
	ta_status.current_vertex_type = 0;
nkeynes@189
   648
	ta_status.poly_vertex_size = 1;
nkeynes@189
   649
	ta_status.poly_context[2] = 0;
nkeynes@189
   650
	ta_status.poly_context[4] = 0;
nkeynes@189
   651
    }
nkeynes@189
   652
nkeynes@189
   653
    ta_status.poly_pointer = (ta_status.poly_vertex_size << 21);
nkeynes@189
   654
    ta_status.poly_context_size = 3;
nkeynes@189
   655
    if( data[0].i & TA_POLYCMD_MODIFIED ) {
nkeynes@189
   656
	ta_status.poly_pointer |= 0x01000000;
nkeynes@189
   657
	if( data[0].i & TA_POLYCMD_FULLMOD ) {
nkeynes@189
   658
	    ta_status.poly_context_size = 5;
nkeynes@189
   659
	    ta_status.poly_vertex_size <<= 1;
nkeynes@189
   660
	    ta_status.current_vertex_type |= 0x40;
nkeynes@189
   661
	    /* Modified/float not supported - behaves as per last intensity */
nkeynes@189
   662
	    if( colourfmt == TA_POLYCMD_COLOURFMT_FLOAT ) {
nkeynes@189
   663
		colourfmt = TA_POLYCMD_COLOURFMT_LASTINT;
nkeynes@189
   664
	    }
nkeynes@189
   665
	}
nkeynes@189
   666
    }
nkeynes@189
   667
    
nkeynes@189
   668
    if( colourfmt == TA_POLYCMD_COLOURFMT_INTENSITY ) {
nkeynes@189
   669
	if( TA_POLYCMD_IS_FULLMOD(data[0].i) ||
nkeynes@189
   670
	    TA_POLYCMD_IS_SPECULAR(data[0].i) ) {
nkeynes@189
   671
	    ta_status.state = STATE_EXPECT_POLY_BLOCK2;
nkeynes@189
   672
	} else {
nkeynes@189
   673
	    ta_status.intensity1 = 
nkeynes@189
   674
		parse_float_colour( data[4].f, data[5].f, data[6].f, data[7].f );
nkeynes@189
   675
	}
nkeynes@189
   676
    } else if( colourfmt == TA_POLYCMD_COLOURFMT_LASTINT ) {
nkeynes@189
   677
	colourfmt = TA_POLYCMD_COLOURFMT_INTENSITY;
nkeynes@189
   678
    }
nkeynes@189
   679
nkeynes@189
   680
    ta_status.current_vertex_type |= colourfmt;
nkeynes@189
   681
}
nkeynes@189
   682
nkeynes@189
   683
/**
nkeynes@189
   684
 * Parse the modifier volume context block and setup the internal state to 
nkeynes@189
   685
 * receive modifier vertexes.
nkeynes@189
   686
 * @param data 32 bytes of parameter data.
nkeynes@189
   687
 */
nkeynes@189
   688
static void ta_parse_modifier_context( union ta_data *data ) {
nkeynes@189
   689
    ta_status.current_vertex_type = TA_VERTEX_MOD_VOLUME;
nkeynes@189
   690
    ta_status.poly_vertex_size = 0;
nkeynes@189
   691
    ta_status.poly_context_size = 3;
nkeynes@189
   692
    ta_status.poly_context[0] = (data[1].i & 0xFC1FFFFF) |
nkeynes@189
   693
	((data[0].i & 0x0B)<<22);
nkeynes@189
   694
    if( TA_POLYCMD_IS_SPECULAR(data[0].i) ) {
nkeynes@189
   695
	ta_status.poly_context[0] |= 0x01000000;
nkeynes@189
   696
    }
nkeynes@189
   697
    ta_status.poly_context[1] = 0;
nkeynes@189
   698
    ta_status.poly_context[2] = 0;
nkeynes@189
   699
    ta_status.vertex_count = 0;
nkeynes@189
   700
    ta_status.max_vertex = 3;
nkeynes@189
   701
    ta_status.poly_pointer = 0;
nkeynes@189
   702
}
nkeynes@189
   703
nkeynes@189
   704
/**
nkeynes@189
   705
 * Parse the sprite context block and setup the internal state to receive
nkeynes@189
   706
 * vertexes.
nkeynes@189
   707
 * @param data 32 bytes of parameter data.
nkeynes@189
   708
 */
nkeynes@189
   709
static void ta_parse_sprite_context( union ta_data *data ) {
nkeynes@189
   710
    ta_status.poly_context_size = 3;
nkeynes@189
   711
    ta_status.poly_context[0] = (data[1].i & 0xFC1FFFFF) |
nkeynes@189
   712
	((data[0].i & 0x0B)<<22) | 0x00400000;
nkeynes@189
   713
    if( TA_POLYCMD_IS_SPECULAR(data[0].i) ) {
nkeynes@189
   714
	ta_status.poly_context[0] |= 0x01000000;
nkeynes@189
   715
    }
nkeynes@189
   716
    ta_status.poly_context[1] = data[2].i;
nkeynes@189
   717
    ta_status.poly_context[2] = data[3].i;
nkeynes@189
   718
    if( data[0].i & TA_POLYCMD_TEXTURED ) {
nkeynes@189
   719
	ta_status.poly_vertex_size = 2;
nkeynes@189
   720
	ta_status.poly_vertex[2].detail[1] = data[4].i;
nkeynes@189
   721
	ta_status.current_vertex_type = TA_VERTEX_TEX_SPRITE;
nkeynes@189
   722
    } else {
nkeynes@189
   723
	ta_status.poly_vertex_size = 1;
nkeynes@189
   724
	ta_status.poly_vertex[2].detail[0] = data[4].i;
nkeynes@189
   725
	ta_status.current_vertex_type = TA_VERTEX_SPRITE;
nkeynes@189
   726
    }
nkeynes@189
   727
    ta_status.vertex_count = 0;
nkeynes@189
   728
    ta_status.max_vertex = 4;
nkeynes@189
   729
    ta_status.poly_pointer = (ta_status.poly_vertex_size << 21);
nkeynes@189
   730
}
nkeynes@189
   731
nkeynes@189
   732
/**
nkeynes@189
   733
 * Copy the last read vertex into all vertexes up to max_vertex. Used for
nkeynes@189
   734
 * Aborted polygons under some circumstances.
nkeynes@189
   735
 */
nkeynes@189
   736
static void ta_fill_vertexes( ) {
nkeynes@189
   737
    int i;
nkeynes@189
   738
    for( i=ta_status.vertex_count; i<ta_status.max_vertex; i++ ) {
nkeynes@189
   739
	memcpy( &ta_status.poly_vertex[i], &ta_status.poly_vertex[ta_status.vertex_count-1],
nkeynes@189
   740
		sizeof( struct pvr2_ta_vertex ) );
nkeynes@189
   741
    }
nkeynes@189
   742
}
nkeynes@189
   743
nkeynes@189
   744
static void ta_parse_vertex( union ta_data *data ) {
nkeynes@189
   745
    struct pvr2_ta_vertex *vertex = &ta_status.poly_vertex[ta_status.vertex_count];
nkeynes@189
   746
    vertex->x = data[1].f;
nkeynes@189
   747
    vertex->y = data[2].f;
nkeynes@189
   748
    vertex->z = data[3].f;
nkeynes@189
   749
nkeynes@189
   750
    switch( ta_status.current_vertex_type ) {
nkeynes@189
   751
    case TA_VERTEX_PACKED:
nkeynes@189
   752
	vertex->detail[0] = data[6].i;
nkeynes@189
   753
	break;
nkeynes@189
   754
    case TA_VERTEX_FLOAT:
nkeynes@189
   755
	vertex->detail[0] = parse_float_colour( data[4].f, data[5].f, data[6].f, data[7].f );
nkeynes@189
   756
	break;
nkeynes@189
   757
    case TA_VERTEX_INTENSITY:
nkeynes@189
   758
	vertex->detail[0] = parse_intensity_colour( ta_status.intensity1, data[6].f );
nkeynes@189
   759
	break;
nkeynes@189
   760
nkeynes@189
   761
    case TA_VERTEX_TEX_SPEC_PACKED:
nkeynes@189
   762
	vertex->detail[3] = data[7].i; /* ARGB */
nkeynes@189
   763
	/* Fallthrough */
nkeynes@189
   764
    case TA_VERTEX_TEX_PACKED:
nkeynes@189
   765
	vertex->detail[0] = data[4].i; /* U */
nkeynes@189
   766
	vertex->detail[1] = data[5].i; /* V */
nkeynes@189
   767
	vertex->detail[2] = data[6].i; /* ARGB */
nkeynes@189
   768
	break;
nkeynes@189
   769
    case TA_VERTEX_TEX_UV16_SPEC_PACKED:
nkeynes@189
   770
	vertex->detail[2] = data[7].i; /* ARGB */
nkeynes@189
   771
	/* Fallthrough */
nkeynes@189
   772
    case TA_VERTEX_TEX_UV16_PACKED:
nkeynes@189
   773
	vertex->detail[0] = data[4].i; /* UV */
nkeynes@189
   774
	vertex->detail[1] = data[6].i; /* ARGB */
nkeynes@189
   775
	break;
nkeynes@189
   776
nkeynes@189
   777
    case TA_VERTEX_TEX_FLOAT:
nkeynes@189
   778
    case TA_VERTEX_TEX_SPEC_FLOAT:
nkeynes@189
   779
	vertex->detail[0] = data[4].i; /* U */
nkeynes@189
   780
	vertex->detail[1] = data[5].i; /* UV */
nkeynes@189
   781
	ta_status.state = STATE_EXPECT_VERTEX_BLOCK2;
nkeynes@189
   782
	break;
nkeynes@189
   783
    case TA_VERTEX_TEX_UV16_FLOAT:
nkeynes@189
   784
    case TA_VERTEX_TEX_UV16_SPEC_FLOAT:
nkeynes@189
   785
	vertex->detail[0] = data[4].i; /* UV */
nkeynes@189
   786
	ta_status.state = STATE_EXPECT_VERTEX_BLOCK2;
nkeynes@189
   787
	break;
nkeynes@189
   788
nkeynes@189
   789
    case TA_VERTEX_TEX_SPEC_INTENSITY:
nkeynes@189
   790
	vertex->detail[3] = parse_intensity_colour( ta_status.intensity2, data[7].f );
nkeynes@189
   791
	/* Fallthrough */
nkeynes@189
   792
    case TA_VERTEX_TEX_INTENSITY:
nkeynes@189
   793
	vertex->detail[0] = data[4].i; /* U */
nkeynes@189
   794
	vertex->detail[1] = data[5].i; /* V */
nkeynes@189
   795
	vertex->detail[2] = parse_intensity_colour( ta_status.intensity1, data[6].f );
nkeynes@189
   796
	break;
nkeynes@189
   797
    case TA_VERTEX_TEX_UV16_SPEC_INTENSITY:
nkeynes@189
   798
	vertex->detail[2] = parse_intensity_colour( ta_status.intensity2, data[7].f );
nkeynes@189
   799
	/* Fallthrough */
nkeynes@189
   800
    case TA_VERTEX_TEX_UV16_INTENSITY:
nkeynes@189
   801
	vertex->detail[0] = data[4].i; /* UV */
nkeynes@189
   802
	vertex->detail[1] = parse_intensity_colour( ta_status.intensity1, data[6].f );
nkeynes@189
   803
	break;
nkeynes@189
   804
nkeynes@189
   805
    case TA_VERTEX_PACKED_MOD:
nkeynes@189
   806
	vertex->detail[0] = data[4].i; /* ARGB */
nkeynes@189
   807
	vertex->detail[1] = data[5].i; /* ARGB */
nkeynes@189
   808
	break;
nkeynes@189
   809
    case TA_VERTEX_INTENSITY_MOD:
nkeynes@189
   810
	vertex->detail[0] = parse_intensity_colour( ta_status.intensity1, data[4].f );
nkeynes@189
   811
	vertex->detail[1] = parse_intensity_colour( ta_status.intensity2, data[5].f );
nkeynes@189
   812
	break;
nkeynes@189
   813
nkeynes@189
   814
    case TA_VERTEX_TEX_SPEC_PACKED_MOD:
nkeynes@189
   815
	vertex->detail[3] = data[7].i; /* ARGB0 */
nkeynes@189
   816
	/* Fallthrough */
nkeynes@189
   817
    case TA_VERTEX_TEX_PACKED_MOD:
nkeynes@189
   818
	vertex->detail[0] = data[4].i; /* U0 */
nkeynes@189
   819
	vertex->detail[1] = data[5].i; /* V0 */
nkeynes@189
   820
	vertex->detail[2] = data[6].i; /* ARGB0 */
nkeynes@189
   821
	ta_status.state = STATE_EXPECT_VERTEX_BLOCK2;
nkeynes@189
   822
	break;
nkeynes@189
   823
    case TA_VERTEX_TEX_UV16_SPEC_PACKED_MOD:
nkeynes@189
   824
	vertex->detail[2] = data[7].i; /* ARGB0 */
nkeynes@189
   825
	/* Fallthrough */
nkeynes@189
   826
    case TA_VERTEX_TEX_UV16_PACKED_MOD:
nkeynes@189
   827
	vertex->detail[0] = data[4].i; /* UV0 */
nkeynes@189
   828
	vertex->detail[1] = data[6].i; /* ARGB0 */
nkeynes@189
   829
	ta_status.state = STATE_EXPECT_VERTEX_BLOCK2;
nkeynes@189
   830
	break;
nkeynes@189
   831
nkeynes@189
   832
    case TA_VERTEX_TEX_SPEC_INTENSITY_MOD:
nkeynes@189
   833
	vertex->detail[3] = parse_intensity_colour( ta_status.intensity1, data[7].f );
nkeynes@189
   834
	/* Fallthrough */
nkeynes@189
   835
    case TA_VERTEX_TEX_INTENSITY_MOD:
nkeynes@189
   836
	vertex->detail[0] = data[4].i; /* U0 */
nkeynes@189
   837
	vertex->detail[1] = data[5].i; /* V0 */
nkeynes@189
   838
	vertex->detail[2] = parse_intensity_colour( ta_status.intensity1, data[6].f );
nkeynes@189
   839
	ta_status.state = STATE_EXPECT_VERTEX_BLOCK2;
nkeynes@189
   840
	break;
nkeynes@189
   841
    case TA_VERTEX_TEX_UV16_SPEC_INTENSITY_MOD:
nkeynes@189
   842
	vertex->detail[2] = parse_intensity_colour( ta_status.intensity1, data[7].f );
nkeynes@189
   843
	/* Fallthrough */
nkeynes@189
   844
    case TA_VERTEX_TEX_UV16_INTENSITY_MOD:
nkeynes@189
   845
	vertex->detail[0] = data[4].i; /* UV0 */
nkeynes@189
   846
	vertex->detail[1] = parse_intensity_colour( ta_status.intensity1, data[6].f );
nkeynes@189
   847
	ta_status.state = STATE_EXPECT_VERTEX_BLOCK2;
nkeynes@189
   848
	break;
nkeynes@189
   849
	
nkeynes@189
   850
    case TA_VERTEX_SPRITE:
nkeynes@189
   851
    case TA_VERTEX_TEX_SPRITE:
nkeynes@189
   852
    case TA_VERTEX_MOD_VOLUME:
nkeynes@189
   853
	vertex++;
nkeynes@189
   854
	vertex->x = data[4].f;
nkeynes@189
   855
	vertex->y = data[5].f;
nkeynes@189
   856
	vertex->z = data[6].f;
nkeynes@189
   857
	vertex++;
nkeynes@189
   858
	vertex->x = data[7].f;
nkeynes@189
   859
	ta_status.vertex_count += 2;
nkeynes@189
   860
	ta_status.state = STATE_EXPECT_VERTEX_BLOCK2;
nkeynes@189
   861
	break;
nkeynes@189
   862
    }
nkeynes@189
   863
    ta_status.vertex_count++;
nkeynes@189
   864
}
nkeynes@189
   865
nkeynes@189
   866
static void ta_parse_vertex_block2( union ta_data *data ) {
nkeynes@189
   867
    struct pvr2_ta_vertex *vertex = &ta_status.poly_vertex[ta_status.vertex_count-1];
nkeynes@189
   868
nkeynes@189
   869
    switch( ta_status.current_vertex_type ) {
nkeynes@189
   870
    case TA_VERTEX_TEX_SPEC_FLOAT:
nkeynes@189
   871
	vertex->detail[3] = parse_float_colour( data[4].f, data[5].f, data[6].f, data[7].f );
nkeynes@189
   872
	/* Fallthrough */
nkeynes@189
   873
    case TA_VERTEX_TEX_FLOAT:
nkeynes@189
   874
	vertex->detail[2] = parse_float_colour( data[0].f, data[1].f, data[2].f, data[3].f );
nkeynes@189
   875
	break;
nkeynes@189
   876
    case TA_VERTEX_TEX_UV16_SPEC_FLOAT:
nkeynes@189
   877
	vertex->detail[2] = parse_float_colour( data[4].f, data[5].f, data[6].f, data[7].f );
nkeynes@189
   878
	/* Fallthrough */
nkeynes@189
   879
    case TA_VERTEX_TEX_UV16_FLOAT:
nkeynes@189
   880
	vertex->detail[1] = parse_float_colour( data[0].f, data[1].f, data[2].f, data[3].f );
nkeynes@189
   881
	break;
nkeynes@189
   882
    case TA_VERTEX_TEX_PACKED_MOD:
nkeynes@189
   883
	vertex->detail[3] = data[0].i; /* U1 */
nkeynes@189
   884
	vertex->detail[4] = data[1].i; /* V1 */
nkeynes@189
   885
	vertex->detail[5] = data[2].i; /* ARGB1 */
nkeynes@189
   886
	break;
nkeynes@189
   887
    case TA_VERTEX_TEX_SPEC_PACKED_MOD:
nkeynes@189
   888
	vertex->detail[4] = data[0].i; /* U1 */
nkeynes@189
   889
	vertex->detail[5] = data[1].i; /* V1 */
nkeynes@189
   890
	vertex->detail[6] = data[2].i; /* ARGB1 */
nkeynes@189
   891
	vertex->detail[7] = data[3].i; /* ARGB1 */
nkeynes@189
   892
	break;
nkeynes@189
   893
    case TA_VERTEX_TEX_UV16_PACKED_MOD:
nkeynes@189
   894
	vertex->detail[2] = data[0].i; /* UV1 */
nkeynes@189
   895
	vertex->detail[3] = data[2].i; /* ARGB1 */
nkeynes@189
   896
	break;
nkeynes@189
   897
    case TA_VERTEX_TEX_UV16_SPEC_PACKED_MOD:
nkeynes@189
   898
	vertex->detail[3] = data[0].i; /* UV1 */
nkeynes@189
   899
	vertex->detail[4] = data[2].i; /* ARGB1 */
nkeynes@189
   900
	vertex->detail[5] = data[3].i; /* ARGB1 */
nkeynes@189
   901
	break;
nkeynes@189
   902
nkeynes@189
   903
    case TA_VERTEX_TEX_INTENSITY_MOD:
nkeynes@189
   904
	vertex->detail[3] = data[0].i; /* U1 */
nkeynes@189
   905
	vertex->detail[4] = data[1].i; /* V1 */
nkeynes@189
   906
	vertex->detail[5] = parse_intensity_colour( ta_status.intensity2, data[2].f ); /* ARGB1 */
nkeynes@189
   907
	break;
nkeynes@189
   908
    case TA_VERTEX_TEX_SPEC_INTENSITY_MOD:
nkeynes@189
   909
	vertex->detail[4] = data[0].i; /* U1 */
nkeynes@189
   910
	vertex->detail[5] = data[1].i; /* V1 */
nkeynes@189
   911
	vertex->detail[6] = parse_intensity_colour( ta_status.intensity2, data[2].f ); /* ARGB1 */
nkeynes@189
   912
	vertex->detail[7] = parse_intensity_colour( ta_status.intensity2, data[3].f ); /* ARGB1 */
nkeynes@189
   913
	break;
nkeynes@189
   914
    case TA_VERTEX_TEX_UV16_INTENSITY_MOD:
nkeynes@189
   915
	vertex->detail[2] = data[0].i; /* UV1 */
nkeynes@189
   916
	vertex->detail[3] = parse_intensity_colour( ta_status.intensity2, data[2].f ); /* ARGB1 */
nkeynes@189
   917
	break;
nkeynes@189
   918
    case TA_VERTEX_TEX_UV16_SPEC_INTENSITY_MOD:
nkeynes@189
   919
	vertex->detail[3] = data[0].i; /* UV1 */
nkeynes@189
   920
	vertex->detail[4] = parse_intensity_colour( ta_status.intensity2, data[2].f ); /* ARGB1 */
nkeynes@189
   921
	vertex->detail[5] = parse_intensity_colour( ta_status.intensity2, data[3].f ); /* ARGB1 */
nkeynes@189
   922
	break;
nkeynes@189
   923
nkeynes@189
   924
    case TA_VERTEX_SPRITE:
nkeynes@189
   925
	vertex->y = data[0].f;
nkeynes@189
   926
	vertex->z = data[1].f;
nkeynes@189
   927
	vertex++;
nkeynes@189
   928
	ta_status.vertex_count++;
nkeynes@189
   929
	vertex->x = data[2].f;
nkeynes@189
   930
	vertex->y = data[3].f;
nkeynes@189
   931
	vertex->z = 0;
nkeynes@189
   932
	vertex->detail[0] = 0;
nkeynes@189
   933
	ta_status.poly_vertex[0].detail[0] = 0;
nkeynes@189
   934
	ta_status.poly_vertex[1].detail[0] = 0;
nkeynes@189
   935
	break;
nkeynes@189
   936
    case TA_VERTEX_TEX_SPRITE:
nkeynes@189
   937
	vertex->y = data[0].f;
nkeynes@189
   938
	vertex->z = data[1].f;
nkeynes@189
   939
	vertex++;
nkeynes@189
   940
	ta_status.vertex_count++;
nkeynes@189
   941
	vertex->x = data[2].f;
nkeynes@189
   942
	vertex->y = data[3].f;
nkeynes@189
   943
	vertex->z = 0;
nkeynes@189
   944
	vertex->detail[0] = 0;
nkeynes@189
   945
	vertex->detail[1] = 0;
nkeynes@189
   946
	ta_status.poly_vertex[0].detail[0] = data[5].i;
nkeynes@189
   947
	ta_status.poly_vertex[0].detail[1] = 0;
nkeynes@189
   948
	ta_status.poly_vertex[1].detail[0] = data[6].i;
nkeynes@189
   949
	ta_status.poly_vertex[1].detail[1] = 0;
nkeynes@189
   950
	ta_status.poly_vertex[2].detail[0] = data[7].i;
nkeynes@189
   951
	break;
nkeynes@189
   952
    case TA_VERTEX_MOD_VOLUME:
nkeynes@189
   953
	vertex->y = data[0].f;
nkeynes@189
   954
	vertex->z = data[1].f;
nkeynes@189
   955
	break;
nkeynes@189
   956
    }
nkeynes@194
   957
    ta_status.state = STATE_IN_POLYGON;
nkeynes@189
   958
}
nkeynes@189
   959
nkeynes@189
   960
/**
nkeynes@189
   961
 * Process 1 32-byte block of ta data
nkeynes@189
   962
 */
nkeynes@189
   963
void pvr2_ta_process_block( char *input ) {
nkeynes@189
   964
    union ta_data *data = (union ta_data *)input;
nkeynes@189
   965
nkeynes@189
   966
    switch( ta_status.state ) {
nkeynes@189
   967
    case STATE_ERROR:
nkeynes@189
   968
	/* Error raised - stop processing until reset */
nkeynes@189
   969
	return;
nkeynes@189
   970
nkeynes@189
   971
    case STATE_EXPECT_POLY_BLOCK2:
nkeynes@189
   972
	/* This is always a pair of floating-point colours */
nkeynes@189
   973
	ta_status.intensity1 = 
nkeynes@189
   974
	    parse_float_colour( data[0].f, data[1].f, data[2].f, data[3].f );
nkeynes@189
   975
	ta_status.intensity2 =
nkeynes@189
   976
	    parse_float_colour( data[4].f, data[5].f, data[6].f, data[7].f );
nkeynes@189
   977
	ta_status.state = STATE_IN_LIST;
nkeynes@189
   978
	break;
nkeynes@189
   979
nkeynes@189
   980
    case STATE_EXPECT_VERTEX_BLOCK2:
nkeynes@189
   981
	ta_parse_vertex_block2( data );
nkeynes@189
   982
	if( ta_status.vertex_count == ta_status.max_vertex ) {
nkeynes@189
   983
	    ta_split_polygon();
nkeynes@189
   984
	}
nkeynes@189
   985
	break;
nkeynes@189
   986
nkeynes@189
   987
    case STATE_EXPECT_END_VERTEX_BLOCK2:
nkeynes@189
   988
	ta_parse_vertex_block2( data );
nkeynes@189
   989
	ta_commit_polygon();
nkeynes@189
   990
	ta_status.vertex_count = 0;
nkeynes@189
   991
	ta_status.poly_parity = 0;
nkeynes@194
   992
	ta_status.state = STATE_IN_LIST;
nkeynes@194
   993
	break;
nkeynes@189
   994
    case STATE_IN_LIST:
nkeynes@194
   995
    case STATE_IN_POLYGON:
nkeynes@189
   996
    case STATE_IDLE:
nkeynes@189
   997
	switch( TA_CMD( data->i ) ) {
nkeynes@189
   998
	case TA_CMD_END_LIST:
nkeynes@189
   999
	    ta_end_list();
nkeynes@189
  1000
	    break;
nkeynes@198
  1001
	case TA_CMD_CLIP:
nkeynes@198
  1002
	    if( ta_status.state == STATE_IN_POLYGON ) {
nkeynes@198
  1003
		asic_event( EVENT_PVR_BAD_INPUT );
nkeynes@198
  1004
		asic_event( EVENT_TA_ERROR );
nkeynes@198
  1005
		/* Enter stuffed up mode */
nkeynes@198
  1006
	    }
nkeynes@198
  1007
	    ta_status.clip.x1 = data[4].i & 0x3F;
nkeynes@198
  1008
	    ta_status.clip.y1 = data[5].i & 0x0F;
nkeynes@198
  1009
	    ta_status.clip.x2 = data[6].i & 0x3F;
nkeynes@198
  1010
	    ta_status.clip.y2 = data[7].i & 0x0F;
nkeynes@189
  1011
	    break;
nkeynes@189
  1012
	case TA_CMD_POLYGON_CONTEXT:
nkeynes@189
  1013
	    if( ta_status.state == STATE_IDLE ) {
nkeynes@189
  1014
		ta_init_list( TA_POLYCMD_LISTTYPE( data->i ) );
nkeynes@189
  1015
	    }
nkeynes@189
  1016
	    
nkeynes@189
  1017
	    if( ta_status.vertex_count != 0 ) {
nkeynes@193
  1018
		/* Error, and not a very well handled one either */
nkeynes@193
  1019
		asic_event( EVENT_PVR_BAD_INPUT );
nkeynes@193
  1020
		asic_event( EVENT_TA_ERROR );
nkeynes@193
  1021
		ta_status.accept_vertexes = FALSE;
nkeynes@189
  1022
		ta_fill_vertexes();
nkeynes@189
  1023
	    } else {
nkeynes@193
  1024
		if( TA_IS_MODIFIER_LIST( ta_status.current_list_type ) ) {
nkeynes@193
  1025
		    ta_parse_modifier_context(data);
nkeynes@193
  1026
		} else {
nkeynes@193
  1027
		    ta_parse_polygon_context(data);
nkeynes@193
  1028
		}
nkeynes@189
  1029
	    }
nkeynes@189
  1030
	    break;
nkeynes@189
  1031
	case TA_CMD_SPRITE_CONTEXT:
nkeynes@189
  1032
	    if( ta_status.state == STATE_IDLE ) {
nkeynes@189
  1033
		ta_init_list( TA_POLYCMD_LISTTYPE( data->i ) );
nkeynes@189
  1034
	    }
nkeynes@189
  1035
nkeynes@189
  1036
	    if( ta_status.vertex_count != 0 ) {
nkeynes@189
  1037
		ta_fill_vertexes();
nkeynes@189
  1038
		ta_commit_polygon();
nkeynes@189
  1039
	    }
nkeynes@189
  1040
nkeynes@189
  1041
	    ta_parse_sprite_context(data);
nkeynes@189
  1042
	    break;
nkeynes@189
  1043
	case TA_CMD_VERTEX:
nkeynes@194
  1044
	    ta_status.state = STATE_IN_POLYGON;
nkeynes@189
  1045
	    ta_parse_vertex(data);
nkeynes@189
  1046
	    
nkeynes@189
  1047
	    if( ta_status.state == STATE_EXPECT_VERTEX_BLOCK2 ) {
nkeynes@189
  1048
		if( TA_IS_END_VERTEX(data[0].i) ) {
nkeynes@189
  1049
		    ta_status.state = STATE_EXPECT_END_VERTEX_BLOCK2;
nkeynes@189
  1050
		}
nkeynes@189
  1051
	    } else if( TA_IS_END_VERTEX(data->i) ) {
nkeynes@189
  1052
		ta_commit_polygon();
nkeynes@189
  1053
		ta_status.vertex_count = 0;
nkeynes@189
  1054
		ta_status.poly_parity = 0;
nkeynes@194
  1055
		ta_status.state = STATE_IN_LIST;
nkeynes@189
  1056
	    } else if( ta_status.vertex_count == ta_status.max_vertex ) {
nkeynes@189
  1057
		ta_split_polygon();
nkeynes@189
  1058
	    }
nkeynes@189
  1059
	    break;
nkeynes@189
  1060
	}
nkeynes@189
  1061
	break;
nkeynes@189
  1062
    }
nkeynes@189
  1063
nkeynes@189
  1064
}
nkeynes@189
  1065
nkeynes@189
  1066
nkeynes@189
  1067
nkeynes@189
  1068
/**
nkeynes@189
  1069
 * Write a block of data to the tile accelerator, adding the data to the 
nkeynes@189
  1070
 * current scene. We don't make any particular attempt to interpret the data
nkeynes@189
  1071
 * at this stage, deferring that until render time.
nkeynes@189
  1072
 *
nkeynes@189
  1073
 * Currently copies the data verbatim to the vertex buffer, processing only
nkeynes@189
  1074
 * far enough to generate the correct end-of-list events. Tile buffer is
nkeynes@189
  1075
 * entirely ignored.
nkeynes@189
  1076
 */
nkeynes@189
  1077
void pvr2_ta_write( char *buf, uint32_t length )
nkeynes@189
  1078
{
nkeynes@189
  1079
    if( ta_status.debug_output ) {
nkeynes@189
  1080
	fwrite_dump32( (uint32_t *)buf, length, stderr );
nkeynes@189
  1081
    }
nkeynes@189
  1082
nkeynes@189
  1083
    for( ; length >=32; length -= 32 ) {
nkeynes@189
  1084
	pvr2_ta_process_block( buf );
nkeynes@189
  1085
	buf += 32;
nkeynes@189
  1086
    }
nkeynes@189
  1087
}
.