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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 198:627220aa0e3b
prev194:7fcecbcd5f01
next199:4433d9c1638c
author nkeynes
date Sun Aug 06 03:36:51 2006 +0000 (13 years ago)
permissions -rw-r--r--
last change Add tile clip parsing
file annotate diff log raw
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/**
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 * $Id: tacore.c,v 1.4 2006-08-06 03:36:51 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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#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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    }
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    MMIO_WRITE( PVR2, TA_POLYPOS, posn );
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    return rv;
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}
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#define TA_NO_ALLOC 0xFFFFFFFF
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/**
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 * Allocate a new tile list block from the grow space and update the
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 * word at reference to be a link to the new block.
nkeynes@189
   325
 */
nkeynes@193
   326
static uint32_t ta_alloc_tilelist( uint32_t reference ) {
nkeynes@189
   327
    uint32_t posn = MMIO_READ( PVR2, TA_LISTPOS );
nkeynes@193
   328
    uint32_t limit = MMIO_READ( PVR2, TA_LISTEND ) >> 2;
nkeynes@189
   329
    uint32_t newposn;
nkeynes@193
   330
    uint32_t result;
nkeynes@189
   331
    if( ta_status.tilelist_dir == TA_GROW_DOWN ) {
nkeynes@189
   332
	newposn = posn - ta_status.tilelist_size;
nkeynes@193
   333
	if( posn == limit ) {
nkeynes@193
   334
	    PVRRAM(posn<<2) = 0xF0000000;
nkeynes@193
   335
	    PVRRAM(reference) = 0xE0000000 | (posn<<2);
nkeynes@193
   336
	    return TA_NO_ALLOC;
nkeynes@193
   337
	} else if( posn < limit ) {
nkeynes@193
   338
	    PVRRAM(reference) = 0xE0000000 | (posn<<2);
nkeynes@193
   339
	    return TA_NO_ALLOC;
nkeynes@193
   340
	} else if( newposn <= limit ) {
nkeynes@193
   341
	} else if( newposn <= (limit + ta_status.tilelist_size) ) {
nkeynes@193
   342
	    asic_event( EVENT_TA_ERROR );
nkeynes@193
   343
	    asic_event( EVENT_PVR_MATRIX_ALLOC_FAIL );
nkeynes@193
   344
	    MMIO_WRITE( PVR2, TA_LISTPOS, newposn );
nkeynes@193
   345
	} else {
nkeynes@193
   346
	    MMIO_WRITE( PVR2, TA_LISTPOS, newposn );
nkeynes@193
   347
	}
nkeynes@193
   348
	PVRRAM(reference) = 0xE0000000 | (posn<<2);
nkeynes@193
   349
	return posn << 2;
nkeynes@189
   350
    } else {
nkeynes@189
   351
	newposn = posn + ta_status.tilelist_size;
nkeynes@193
   352
	if( posn == limit ) {
nkeynes@193
   353
	    PVRRAM(posn<<2) = 0xF0000000;
nkeynes@193
   354
	    PVRRAM(reference) = 0xE0000000 | (posn<<2);
nkeynes@193
   355
	    return TA_NO_ALLOC;
nkeynes@193
   356
	} else if ( posn > limit ) {
nkeynes@193
   357
	    PVRRAM(reference) = 0xE0000000 | (posn<<2);
nkeynes@193
   358
	    return TA_NO_ALLOC;
nkeynes@193
   359
	} else if( newposn >= limit ) {
nkeynes@193
   360
	} else if( newposn >= (limit - ta_status.tilelist_size) ) {
nkeynes@193
   361
	    asic_event( EVENT_TA_ERROR );
nkeynes@193
   362
	    asic_event( EVENT_PVR_MATRIX_ALLOC_FAIL );
nkeynes@193
   363
	    MMIO_WRITE( PVR2, TA_LISTPOS, newposn );
nkeynes@193
   364
	} else {
nkeynes@193
   365
	    MMIO_WRITE( PVR2, TA_LISTPOS, newposn );
nkeynes@193
   366
	}	    
nkeynes@193
   367
	PVRRAM(reference) = 0xE0000000 | (posn<<2);
nkeynes@193
   368
	return posn << 2;
nkeynes@189
   369
    }
nkeynes@189
   370
}
nkeynes@189
   371
nkeynes@189
   372
/**
nkeynes@189
   373
 * Write a tile entry out to the matrix.
nkeynes@189
   374
 */
nkeynes@189
   375
static int ta_write_tile_entry( int x, int y, uint32_t tile_entry ) {
nkeynes@189
   376
    uint32_t tile = TILESLOT(x,y);
nkeynes@193
   377
    uint32_t tilestart = tile;
nkeynes@189
   378
    uint32_t value;
nkeynes@189
   379
    uint32_t lasttri = 0;
nkeynes@189
   380
    int i,l;
nkeynes@189
   381
nkeynes@189
   382
    if( (tile_entry & 0x80000000) && 
nkeynes@189
   383
	ta_status.last_triangle_bounds.x1 != -1 &&
nkeynes@189
   384
	ta_status.last_triangle_bounds.x1 <= x &&
nkeynes@189
   385
	ta_status.last_triangle_bounds.x2 >= x &&
nkeynes@189
   386
	ta_status.last_triangle_bounds.y1 <= y &&
nkeynes@189
   387
	ta_status.last_triangle_bounds.y2 >= y ) {
nkeynes@189
   388
	/* potential for triangle stacking */
nkeynes@189
   389
	lasttri = tile_entry & 0xE1E00000;
nkeynes@189
   390
    }
nkeynes@189
   391
    
nkeynes@189
   392
    
nkeynes@189
   393
    if( PVRRAM(tile) == 0xF0000000 ) {
nkeynes@189
   394
	PVRRAM(tile) = tile_entry;
nkeynes@189
   395
	PVRRAM(tile+4) = 0xF0000000;
nkeynes@189
   396
	return;
nkeynes@189
   397
    }
nkeynes@189
   398
nkeynes@189
   399
    while(1) {
nkeynes@189
   400
	value = PVRRAM(tile);
nkeynes@189
   401
	for( i=1; i<ta_status.current_tile_size; i++ ) {
nkeynes@189
   402
	    tile += 4;
nkeynes@189
   403
	    uint32_t nextval = PVRRAM(tile);
nkeynes@189
   404
	    if( nextval == 0xF0000000 ) {
nkeynes@189
   405
		if( lasttri != 0 && lasttri == (value&0xE1E00000) ) {
nkeynes@189
   406
		    int count = (value & 0x1E000000) + 0x02000000;
nkeynes@189
   407
		    if( count < 0x20000000 ) {
nkeynes@189
   408
			PVRRAM(tile-4) = (value & 0xE1FFFFFF) | count;
nkeynes@189
   409
			return;
nkeynes@189
   410
		    }
nkeynes@189
   411
		}
nkeynes@189
   412
		if( i < ta_status.current_tile_size-1 ) {
nkeynes@189
   413
		    PVRRAM(tile) = tile_entry;
nkeynes@189
   414
		    PVRRAM(tile+4) = 0xF0000000;
nkeynes@189
   415
		    return;
nkeynes@189
   416
		}
nkeynes@189
   417
	    }
nkeynes@189
   418
	    value = nextval;
nkeynes@189
   419
	}
nkeynes@189
   420
nkeynes@189
   421
	if( value == 0xF0000000 ) {
nkeynes@193
   422
	    tile = ta_alloc_tilelist(tile);
nkeynes@193
   423
	    if( tile != TA_NO_ALLOC ) {
nkeynes@193
   424
		PVRRAM(tile) = tile_entry;
nkeynes@193
   425
		PVRRAM(tile+4) = 0xF0000000;
nkeynes@193
   426
	    }
nkeynes@189
   427
	    return;
nkeynes@189
   428
	} else if( (value & 0xFF000000) == 0xE0000000 ) {
nkeynes@193
   429
	    value &= 0x00FFFFFF;
nkeynes@193
   430
	    if( value == tilestart )
nkeynes@193
   431
		return 0; /* Loop */
nkeynes@193
   432
	    tilestart = tile = value;
nkeynes@189
   433
	} else {
nkeynes@189
   434
	    /* This should never happen */
nkeynes@189
   435
	    return 0;
nkeynes@189
   436
	}
nkeynes@189
   437
    }
nkeynes@189
   438
}
nkeynes@189
   439
nkeynes@189
   440
/**
nkeynes@189
   441
 * Write a completed polygon out to the memory buffers 
nkeynes@189
   442
 * OPTIMIZEME: This is not terribly efficient at the moment.
nkeynes@189
   443
 */
nkeynes@189
   444
static void ta_commit_polygon( ) {
nkeynes@189
   445
    int i, x, y;
nkeynes@189
   446
    int tx[ta_status.vertex_count], ty[ta_status.vertex_count];
nkeynes@189
   447
    struct tile_bounds triangle_bound[ta_status.vertex_count - 2];
nkeynes@189
   448
    struct tile_bounds polygon_bound;
nkeynes@189
   449
    uint32_t poly_context[5];
nkeynes@189
   450
nkeynes@189
   451
    if( ta_status.vertex_count < 2 ) {
nkeynes@189
   452
	return; /* No polygons - ignore */
nkeynes@189
   453
    }
nkeynes@189
   454
    memcpy( poly_context, ta_status.poly_context, ta_status.poly_context_size * 4 );
nkeynes@189
   455
nkeynes@189
   456
    /* Compute the tile coordinates for each vertex (need to be careful with
nkeynes@189
   457
     * clamping here)
nkeynes@189
   458
     */
nkeynes@189
   459
    for( i=0; i<ta_status.vertex_count; i++ ) {
nkeynes@189
   460
	if( ta_status.poly_vertex[i].x < 0.0 ) {
nkeynes@189
   461
	    tx[i] = -1;
nkeynes@189
   462
	} else if( ta_status.poly_vertex[i].x > (float)INT_MAX ) {
nkeynes@189
   463
	    tx[i] = INT_MAX/32;
nkeynes@189
   464
	} else {
nkeynes@189
   465
	    tx[i] = (int)(ta_status.poly_vertex[i].x / 32.0);
nkeynes@189
   466
	}
nkeynes@189
   467
	if( ta_status.poly_vertex[i].y < 0.0 ) {
nkeynes@189
   468
	    ty[i] = -1;
nkeynes@189
   469
	} else if( ta_status.poly_vertex[i].y > (float)INT_MAX ) {
nkeynes@189
   470
	    ty[i] = INT_MAX/32;
nkeynes@189
   471
	} else {
nkeynes@189
   472
	    ty[i] = (int)(ta_status.poly_vertex[i].y / 32.0);
nkeynes@189
   473
	}
nkeynes@189
   474
	
nkeynes@189
   475
    }
nkeynes@189
   476
nkeynes@189
   477
    /* Compute bounding box for each triangle individually, as well
nkeynes@189
   478
     * as the overall polygon.
nkeynes@189
   479
     */
nkeynes@189
   480
nkeynes@189
   481
    for( i=0; i<ta_status.vertex_count-2; i++ ) {
nkeynes@189
   482
	triangle_bound[i].x1 = MIN3(tx[i],tx[i+1],tx[i+2]);
nkeynes@189
   483
	triangle_bound[i].x2 = MAX3(tx[i],tx[i+1],tx[i+2]);
nkeynes@189
   484
	triangle_bound[i].y1 = MIN3(ty[i],ty[i+1],ty[i+2]);
nkeynes@189
   485
	triangle_bound[i].y2 = MAX3(ty[i],ty[i+1],ty[i+2]);
nkeynes@189
   486
	if( i == 0 ) {
nkeynes@189
   487
	    polygon_bound.x1 = triangle_bound[0].x1;
nkeynes@189
   488
	    polygon_bound.y1 = triangle_bound[0].y1;
nkeynes@189
   489
	    polygon_bound.x2 = triangle_bound[0].x2;
nkeynes@189
   490
	    polygon_bound.y2 = triangle_bound[0].y2;
nkeynes@189
   491
	} else {
nkeynes@189
   492
	    polygon_bound.x1 = MIN(polygon_bound.x1, triangle_bound[i].x1);
nkeynes@189
   493
	    polygon_bound.x2 = MAX(polygon_bound.x2, triangle_bound[i].x2);
nkeynes@189
   494
	    polygon_bound.y1 = MIN(polygon_bound.y1, triangle_bound[i].y1);
nkeynes@189
   495
	    polygon_bound.y2 = MAX(polygon_bound.y2, triangle_bound[i].y2);
nkeynes@189
   496
	}
nkeynes@189
   497
    }
nkeynes@189
   498
nkeynes@189
   499
    /* If the polygon is actually entirely out of the frustum, clip it entirely */
nkeynes@189
   500
    if( polygon_bound.x2 < 0 || polygon_bound.x1 > ta_status.width ||
nkeynes@189
   501
	polygon_bound.y2 < 0 || polygon_bound.y1 > ta_status.height ) {
nkeynes@189
   502
	return;
nkeynes@189
   503
    }
nkeynes@189
   504
nkeynes@189
   505
    /* Clamp the polygon bounds to the frustum */
nkeynes@189
   506
    if( polygon_bound.x1 < 0 ) polygon_bound.x1 = 0;
nkeynes@189
   507
    if( polygon_bound.x2 >= ta_status.width ) polygon_bound.x2 = ta_status.width-1;
nkeynes@189
   508
    if( polygon_bound.y1 < 0 ) polygon_bound.y1 = 0;
nkeynes@189
   509
    if( polygon_bound.y2 >= ta_status.width ) polygon_bound.y2 = ta_status.height-1;
nkeynes@189
   510
nkeynes@189
   511
    /* Set the "single tile" flag if it's entirely contained in 1 tile */
nkeynes@189
   512
    if( polygon_bound.x1 == polygon_bound.x2 &&
nkeynes@189
   513
	polygon_bound.y1 == polygon_bound.y2 ) {
nkeynes@189
   514
	poly_context[0] |= 0x00200000;
nkeynes@189
   515
    }
nkeynes@189
   516
nkeynes@189
   517
    /* Ok, we're good to go - write out the polygon first */
nkeynes@189
   518
    uint32_t tile_entry = MMIO_READ( PVR2, TA_POLYPOS ) >> 2 | ta_status.poly_pointer;
nkeynes@189
   519
    
nkeynes@189
   520
    int status = ta_write_polygon_buffer( poly_context, ta_status.poly_context_size );
nkeynes@189
   521
    if( status == 0 ) {
nkeynes@189
   522
	/* No memory available - abort */
nkeynes@189
   523
	return;
nkeynes@189
   524
    } else {
nkeynes@189
   525
	for( i=0; i<ta_status.vertex_count && status != 0; i++ ) {
nkeynes@189
   526
	    status = ta_write_polygon_buffer( (uint32_t *)(&ta_status.poly_vertex[i]), 3 + ta_status.poly_vertex_size );
nkeynes@189
   527
	}
nkeynes@189
   528
    }
nkeynes@189
   529
nkeynes@193
   530
    if( ta_status.current_tile_size == 0 ) {
nkeynes@193
   531
	/* No memory for tile entry, so don't write anything */
nkeynes@193
   532
	return;
nkeynes@193
   533
    }
nkeynes@193
   534
nkeynes@189
   535
    /* And now the tile entries. Triangles are different from everything else */
nkeynes@189
   536
    if( ta_status.vertex_count == 3 ) {
nkeynes@189
   537
	tile_entry |= 0x80000000;
nkeynes@189
   538
	for( y=polygon_bound.y1; y<=polygon_bound.y2; y++ ) {
nkeynes@189
   539
	    for( x=polygon_bound.x1; x<=polygon_bound.x2; x++ ) {
nkeynes@189
   540
		ta_write_tile_entry( x,y,tile_entry );
nkeynes@189
   541
	    }
nkeynes@189
   542
	}
nkeynes@189
   543
	ta_status.last_triangle_bounds.x1 = polygon_bound.x1;
nkeynes@189
   544
	ta_status.last_triangle_bounds.y1 = polygon_bound.y1;
nkeynes@189
   545
	ta_status.last_triangle_bounds.x2 = polygon_bound.x2;
nkeynes@189
   546
	ta_status.last_triangle_bounds.y2 = polygon_bound.y2;
nkeynes@189
   547
    } else if( ta_status.current_vertex_type == TA_VERTEX_SPRITE ||
nkeynes@189
   548
	       ta_status.current_vertex_type == TA_VERTEX_TEX_SPRITE ) {
nkeynes@189
   549
	tile_entry |= 0xA0000000;
nkeynes@189
   550
	for( y=polygon_bound.y1; y<=polygon_bound.y2; y++ ) {
nkeynes@189
   551
	    for( x=polygon_bound.x1; x<=polygon_bound.x2; x++ ) {
nkeynes@189
   552
		ta_write_tile_entry( x,y,tile_entry );
nkeynes@189
   553
	    }
nkeynes@189
   554
	}
nkeynes@189
   555
	ta_status.last_triangle_bounds.x1 = polygon_bound.x1;
nkeynes@189
   556
	ta_status.last_triangle_bounds.y1 = polygon_bound.y1;
nkeynes@189
   557
	ta_status.last_triangle_bounds.x2 = polygon_bound.x2;
nkeynes@189
   558
	ta_status.last_triangle_bounds.y2 = polygon_bound.y2;
nkeynes@189
   559
    } else {
nkeynes@189
   560
	for( y=polygon_bound.y1; y<=polygon_bound.y2; y++ ) {
nkeynes@189
   561
	    for( x=polygon_bound.x1; x<=polygon_bound.x2; x++ ) {
nkeynes@189
   562
		uint32_t entry = tile_entry;
nkeynes@189
   563
		for( i=0; i<ta_status.vertex_count-2; i++ ) {
nkeynes@189
   564
		    if( triangle_bound[i].x1 <= x && triangle_bound[i].x2 >= x &&
nkeynes@189
   565
			triangle_bound[i].y1 <= y && triangle_bound[i].y2 >= y ) {
nkeynes@189
   566
			entry |= (0x40000000>>i);
nkeynes@189
   567
		    }
nkeynes@189
   568
		}
nkeynes@189
   569
		ta_write_tile_entry( x, y, entry );
nkeynes@189
   570
	    }
nkeynes@189
   571
	}
nkeynes@189
   572
	ta_status.last_triangle_bounds.x1 = -1;
nkeynes@189
   573
    }
nkeynes@189
   574
}
nkeynes@189
   575
nkeynes@189
   576
/**
nkeynes@189
   577
 * Variant of ta_split_polygon called when vertex_count == max_vertex, but 
nkeynes@189
   578
 * the client hasn't sent the LAST VERTEX flag. Commit the poly as normal
nkeynes@189
   579
 * first, then start a new poly with the first 2 vertexes taken from the 
nkeynes@189
   580
 * current one.
nkeynes@189
   581
 */
nkeynes@189
   582
static void ta_split_polygon() {
nkeynes@189
   583
    ta_commit_polygon();
nkeynes@189
   584
    if( TA_IS_NORMAL_POLY() ) { 
nkeynes@189
   585
	/* This only applies to ordinary polys - Sprites + modifier lists are
nkeynes@189
   586
	 * handled differently
nkeynes@189
   587
	 */
nkeynes@189
   588
	if( ta_status.vertex_count == 3 ) {
nkeynes@189
   589
	    /* Triangles use an odd/even scheme */
nkeynes@189
   590
	    if( ta_status.poly_parity == 0 ) {
nkeynes@189
   591
		memcpy( &ta_status.poly_vertex[0], &ta_status.poly_vertex[2], 
nkeynes@189
   592
			sizeof(struct pvr2_ta_vertex) );
nkeynes@189
   593
		ta_status.poly_parity = 1;
nkeynes@189
   594
	    } else {
nkeynes@189
   595
		memcpy( &ta_status.poly_vertex[1], &ta_status.poly_vertex[2],
nkeynes@189
   596
			sizeof(struct pvr2_ta_vertex) );
nkeynes@189
   597
		ta_status.poly_parity = 0;
nkeynes@189
   598
	    }
nkeynes@189
   599
	} else {
nkeynes@189
   600
	    /* Everything else just uses the last 2 vertexes in order */
nkeynes@189
   601
	    memcpy( &ta_status.poly_vertex[0], &ta_status.poly_vertex[ta_status.vertex_count-2], 
nkeynes@189
   602
		    sizeof(struct pvr2_ta_vertex)*2 );
nkeynes@189
   603
	    ta_status.poly_parity = 0;
nkeynes@189
   604
	}
nkeynes@189
   605
	ta_status.vertex_count = 2;
nkeynes@189
   606
    } else {
nkeynes@189
   607
	ta_status.vertex_count = 0;
nkeynes@189
   608
    }
nkeynes@189
   609
}
nkeynes@189
   610
nkeynes@189
   611
/**
nkeynes@189
   612
 * Parse the polygon context block and setup the internal state to receive
nkeynes@189
   613
 * vertexes.
nkeynes@189
   614
 * @param data 32 bytes of parameter data.
nkeynes@189
   615
 */
nkeynes@189
   616
static void ta_parse_polygon_context( union ta_data *data ) {
nkeynes@189
   617
    int colourfmt = TA_POLYCMD_COLOURFMT(data[0].i);
nkeynes@194
   618
    if( TA_POLYCMD_USELENGTH(data[0].i) ) {
nkeynes@194
   619
	ta_status.max_vertex = TA_POLYCMD_LENGTH(data[0].i);
nkeynes@194
   620
    }
nkeynes@189
   621
    ta_status.vertex_count = 0;
nkeynes@189
   622
    ta_status.poly_context[0] = 
nkeynes@189
   623
	(data[1].i & 0xFC1FFFFF) | ((data[0].i & 0x0B) << 22);
nkeynes@189
   624
    ta_status.poly_context[1] = data[2].i;
nkeynes@189
   625
    ta_status.poly_context[3] = data[4].i;
nkeynes@189
   626
    ta_status.poly_parity = 0;
nkeynes@189
   627
    if( data[0].i & TA_POLYCMD_TEXTURED ) {
nkeynes@189
   628
	ta_status.current_vertex_type = data[0].i & 0x0D;
nkeynes@189
   629
	ta_status.poly_context[2] = data[3].i;
nkeynes@189
   630
	ta_status.poly_context[4] = data[5].i;
nkeynes@189
   631
	if( data[0].i & TA_POLYCMD_SPECULAR ) {
nkeynes@189
   632
	    ta_status.poly_context[0] |= 0x01000000;
nkeynes@189
   633
	    ta_status.poly_vertex_size = 4;
nkeynes@189
   634
	} else {
nkeynes@189
   635
	    ta_status.poly_vertex_size = 3;
nkeynes@189
   636
	}
nkeynes@189
   637
	if( data[0].i & TA_POLYCMD_UV16 ) {
nkeynes@189
   638
	    ta_status.poly_vertex_size--;
nkeynes@189
   639
	}
nkeynes@189
   640
    } else {
nkeynes@189
   641
	ta_status.current_vertex_type = 0;
nkeynes@189
   642
	ta_status.poly_vertex_size = 1;
nkeynes@189
   643
	ta_status.poly_context[2] = 0;
nkeynes@189
   644
	ta_status.poly_context[4] = 0;
nkeynes@189
   645
    }
nkeynes@189
   646
nkeynes@189
   647
    ta_status.poly_pointer = (ta_status.poly_vertex_size << 21);
nkeynes@189
   648
    ta_status.poly_context_size = 3;
nkeynes@189
   649
    if( data[0].i & TA_POLYCMD_MODIFIED ) {
nkeynes@189
   650
	ta_status.poly_pointer |= 0x01000000;
nkeynes@189
   651
	if( data[0].i & TA_POLYCMD_FULLMOD ) {
nkeynes@189
   652
	    ta_status.poly_context_size = 5;
nkeynes@189
   653
	    ta_status.poly_vertex_size <<= 1;
nkeynes@189
   654
	    ta_status.current_vertex_type |= 0x40;
nkeynes@189
   655
	    /* Modified/float not supported - behaves as per last intensity */
nkeynes@189
   656
	    if( colourfmt == TA_POLYCMD_COLOURFMT_FLOAT ) {
nkeynes@189
   657
		colourfmt = TA_POLYCMD_COLOURFMT_LASTINT;
nkeynes@189
   658
	    }
nkeynes@189
   659
	}
nkeynes@189
   660
    }
nkeynes@189
   661
    
nkeynes@189
   662
    if( colourfmt == TA_POLYCMD_COLOURFMT_INTENSITY ) {
nkeynes@189
   663
	if( TA_POLYCMD_IS_FULLMOD(data[0].i) ||
nkeynes@189
   664
	    TA_POLYCMD_IS_SPECULAR(data[0].i) ) {
nkeynes@189
   665
	    ta_status.state = STATE_EXPECT_POLY_BLOCK2;
nkeynes@189
   666
	} else {
nkeynes@189
   667
	    ta_status.intensity1 = 
nkeynes@189
   668
		parse_float_colour( data[4].f, data[5].f, data[6].f, data[7].f );
nkeynes@189
   669
	}
nkeynes@189
   670
    } else if( colourfmt == TA_POLYCMD_COLOURFMT_LASTINT ) {
nkeynes@189
   671
	colourfmt = TA_POLYCMD_COLOURFMT_INTENSITY;
nkeynes@189
   672
    }
nkeynes@189
   673
nkeynes@189
   674
    ta_status.current_vertex_type |= colourfmt;
nkeynes@189
   675
}
nkeynes@189
   676
nkeynes@189
   677
/**
nkeynes@189
   678
 * Parse the modifier volume context block and setup the internal state to 
nkeynes@189
   679
 * receive modifier vertexes.
nkeynes@189
   680
 * @param data 32 bytes of parameter data.
nkeynes@189
   681
 */
nkeynes@189
   682
static void ta_parse_modifier_context( union ta_data *data ) {
nkeynes@189
   683
    ta_status.current_vertex_type = TA_VERTEX_MOD_VOLUME;
nkeynes@189
   684
    ta_status.poly_vertex_size = 0;
nkeynes@189
   685
    ta_status.poly_context_size = 3;
nkeynes@189
   686
    ta_status.poly_context[0] = (data[1].i & 0xFC1FFFFF) |
nkeynes@189
   687
	((data[0].i & 0x0B)<<22);
nkeynes@189
   688
    if( TA_POLYCMD_IS_SPECULAR(data[0].i) ) {
nkeynes@189
   689
	ta_status.poly_context[0] |= 0x01000000;
nkeynes@189
   690
    }
nkeynes@189
   691
    ta_status.poly_context[1] = 0;
nkeynes@189
   692
    ta_status.poly_context[2] = 0;
nkeynes@189
   693
    ta_status.vertex_count = 0;
nkeynes@189
   694
    ta_status.max_vertex = 3;
nkeynes@189
   695
    ta_status.poly_pointer = 0;
nkeynes@189
   696
}
nkeynes@189
   697
nkeynes@189
   698
/**
nkeynes@189
   699
 * Parse the sprite context block and setup the internal state to receive
nkeynes@189
   700
 * vertexes.
nkeynes@189
   701
 * @param data 32 bytes of parameter data.
nkeynes@189
   702
 */
nkeynes@189
   703
static void ta_parse_sprite_context( union ta_data *data ) {
nkeynes@189
   704
    ta_status.poly_context_size = 3;
nkeynes@189
   705
    ta_status.poly_context[0] = (data[1].i & 0xFC1FFFFF) |
nkeynes@189
   706
	((data[0].i & 0x0B)<<22) | 0x00400000;
nkeynes@189
   707
    if( TA_POLYCMD_IS_SPECULAR(data[0].i) ) {
nkeynes@189
   708
	ta_status.poly_context[0] |= 0x01000000;
nkeynes@189
   709
    }
nkeynes@189
   710
    ta_status.poly_context[1] = data[2].i;
nkeynes@189
   711
    ta_status.poly_context[2] = data[3].i;
nkeynes@189
   712
    if( data[0].i & TA_POLYCMD_TEXTURED ) {
nkeynes@189
   713
	ta_status.poly_vertex_size = 2;
nkeynes@189
   714
	ta_status.poly_vertex[2].detail[1] = data[4].i;
nkeynes@189
   715
	ta_status.current_vertex_type = TA_VERTEX_TEX_SPRITE;
nkeynes@189
   716
    } else {
nkeynes@189
   717
	ta_status.poly_vertex_size = 1;
nkeynes@189
   718
	ta_status.poly_vertex[2].detail[0] = data[4].i;
nkeynes@189
   719
	ta_status.current_vertex_type = TA_VERTEX_SPRITE;
nkeynes@189
   720
    }
nkeynes@189
   721
    ta_status.vertex_count = 0;
nkeynes@189
   722
    ta_status.max_vertex = 4;
nkeynes@189
   723
    ta_status.poly_pointer = (ta_status.poly_vertex_size << 21);
nkeynes@189
   724
}
nkeynes@189
   725
nkeynes@189
   726
/**
nkeynes@189
   727
 * Copy the last read vertex into all vertexes up to max_vertex. Used for
nkeynes@189
   728
 * Aborted polygons under some circumstances.
nkeynes@189
   729
 */
nkeynes@189
   730
static void ta_fill_vertexes( ) {
nkeynes@189
   731
    int i;
nkeynes@189
   732
    for( i=ta_status.vertex_count; i<ta_status.max_vertex; i++ ) {
nkeynes@189
   733
	memcpy( &ta_status.poly_vertex[i], &ta_status.poly_vertex[ta_status.vertex_count-1],
nkeynes@189
   734
		sizeof( struct pvr2_ta_vertex ) );
nkeynes@189
   735
    }
nkeynes@189
   736
}
nkeynes@189
   737
nkeynes@189
   738
static void ta_parse_vertex( union ta_data *data ) {
nkeynes@189
   739
    struct pvr2_ta_vertex *vertex = &ta_status.poly_vertex[ta_status.vertex_count];
nkeynes@189
   740
    vertex->x = data[1].f;
nkeynes@189
   741
    vertex->y = data[2].f;
nkeynes@189
   742
    vertex->z = data[3].f;
nkeynes@189
   743
nkeynes@189
   744
    switch( ta_status.current_vertex_type ) {
nkeynes@189
   745
    case TA_VERTEX_PACKED:
nkeynes@189
   746
	vertex->detail[0] = data[6].i;
nkeynes@189
   747
	break;
nkeynes@189
   748
    case TA_VERTEX_FLOAT:
nkeynes@189
   749
	vertex->detail[0] = parse_float_colour( data[4].f, data[5].f, data[6].f, data[7].f );
nkeynes@189
   750
	break;
nkeynes@189
   751
    case TA_VERTEX_INTENSITY:
nkeynes@189
   752
	vertex->detail[0] = parse_intensity_colour( ta_status.intensity1, data[6].f );
nkeynes@189
   753
	break;
nkeynes@189
   754
nkeynes@189
   755
    case TA_VERTEX_TEX_SPEC_PACKED:
nkeynes@189
   756
	vertex->detail[3] = data[7].i; /* ARGB */
nkeynes@189
   757
	/* Fallthrough */
nkeynes@189
   758
    case TA_VERTEX_TEX_PACKED:
nkeynes@189
   759
	vertex->detail[0] = data[4].i; /* U */
nkeynes@189
   760
	vertex->detail[1] = data[5].i; /* V */
nkeynes@189
   761
	vertex->detail[2] = data[6].i; /* ARGB */
nkeynes@189
   762
	break;
nkeynes@189
   763
    case TA_VERTEX_TEX_UV16_SPEC_PACKED:
nkeynes@189
   764
	vertex->detail[2] = data[7].i; /* ARGB */
nkeynes@189
   765
	/* Fallthrough */
nkeynes@189
   766
    case TA_VERTEX_TEX_UV16_PACKED:
nkeynes@189
   767
	vertex->detail[0] = data[4].i; /* UV */
nkeynes@189
   768
	vertex->detail[1] = data[6].i; /* ARGB */
nkeynes@189
   769
	break;
nkeynes@189
   770
nkeynes@189
   771
    case TA_VERTEX_TEX_FLOAT:
nkeynes@189
   772
    case TA_VERTEX_TEX_SPEC_FLOAT:
nkeynes@189
   773
	vertex->detail[0] = data[4].i; /* U */
nkeynes@189
   774
	vertex->detail[1] = data[5].i; /* UV */
nkeynes@189
   775
	ta_status.state = STATE_EXPECT_VERTEX_BLOCK2;
nkeynes@189
   776
	break;
nkeynes@189
   777
    case TA_VERTEX_TEX_UV16_FLOAT:
nkeynes@189
   778
    case TA_VERTEX_TEX_UV16_SPEC_FLOAT:
nkeynes@189
   779
	vertex->detail[0] = data[4].i; /* UV */
nkeynes@189
   780
	ta_status.state = STATE_EXPECT_VERTEX_BLOCK2;
nkeynes@189
   781
	break;
nkeynes@189
   782
nkeynes@189
   783
    case TA_VERTEX_TEX_SPEC_INTENSITY:
nkeynes@189
   784
	vertex->detail[3] = parse_intensity_colour( ta_status.intensity2, data[7].f );
nkeynes@189
   785
	/* Fallthrough */
nkeynes@189
   786
    case TA_VERTEX_TEX_INTENSITY:
nkeynes@189
   787
	vertex->detail[0] = data[4].i; /* U */
nkeynes@189
   788
	vertex->detail[1] = data[5].i; /* V */
nkeynes@189
   789
	vertex->detail[2] = parse_intensity_colour( ta_status.intensity1, data[6].f );
nkeynes@189
   790
	break;
nkeynes@189
   791
    case TA_VERTEX_TEX_UV16_SPEC_INTENSITY:
nkeynes@189
   792
	vertex->detail[2] = parse_intensity_colour( ta_status.intensity2, data[7].f );
nkeynes@189
   793
	/* Fallthrough */
nkeynes@189
   794
    case TA_VERTEX_TEX_UV16_INTENSITY:
nkeynes@189
   795
	vertex->detail[0] = data[4].i; /* UV */
nkeynes@189
   796
	vertex->detail[1] = parse_intensity_colour( ta_status.intensity1, data[6].f );
nkeynes@189
   797
	break;
nkeynes@189
   798
nkeynes@189
   799
    case TA_VERTEX_PACKED_MOD:
nkeynes@189
   800
	vertex->detail[0] = data[4].i; /* ARGB */
nkeynes@189
   801
	vertex->detail[1] = data[5].i; /* ARGB */
nkeynes@189
   802
	break;
nkeynes@189
   803
    case TA_VERTEX_INTENSITY_MOD:
nkeynes@189
   804
	vertex->detail[0] = parse_intensity_colour( ta_status.intensity1, data[4].f );
nkeynes@189
   805
	vertex->detail[1] = parse_intensity_colour( ta_status.intensity2, data[5].f );
nkeynes@189
   806
	break;
nkeynes@189
   807
nkeynes@189
   808
    case TA_VERTEX_TEX_SPEC_PACKED_MOD:
nkeynes@189
   809
	vertex->detail[3] = data[7].i; /* ARGB0 */
nkeynes@189
   810
	/* Fallthrough */
nkeynes@189
   811
    case TA_VERTEX_TEX_PACKED_MOD:
nkeynes@189
   812
	vertex->detail[0] = data[4].i; /* U0 */
nkeynes@189
   813
	vertex->detail[1] = data[5].i; /* V0 */
nkeynes@189
   814
	vertex->detail[2] = data[6].i; /* ARGB0 */
nkeynes@189
   815
	ta_status.state = STATE_EXPECT_VERTEX_BLOCK2;
nkeynes@189
   816
	break;
nkeynes@189
   817
    case TA_VERTEX_TEX_UV16_SPEC_PACKED_MOD:
nkeynes@189
   818
	vertex->detail[2] = data[7].i; /* ARGB0 */
nkeynes@189
   819
	/* Fallthrough */
nkeynes@189
   820
    case TA_VERTEX_TEX_UV16_PACKED_MOD:
nkeynes@189
   821
	vertex->detail[0] = data[4].i; /* UV0 */
nkeynes@189
   822
	vertex->detail[1] = data[6].i; /* ARGB0 */
nkeynes@189
   823
	ta_status.state = STATE_EXPECT_VERTEX_BLOCK2;
nkeynes@189
   824
	break;
nkeynes@189
   825
nkeynes@189
   826
    case TA_VERTEX_TEX_SPEC_INTENSITY_MOD:
nkeynes@189
   827
	vertex->detail[3] = parse_intensity_colour( ta_status.intensity1, data[7].f );
nkeynes@189
   828
	/* Fallthrough */
nkeynes@189
   829
    case TA_VERTEX_TEX_INTENSITY_MOD:
nkeynes@189
   830
	vertex->detail[0] = data[4].i; /* U0 */
nkeynes@189
   831
	vertex->detail[1] = data[5].i; /* V0 */
nkeynes@189
   832
	vertex->detail[2] = parse_intensity_colour( ta_status.intensity1, data[6].f );
nkeynes@189
   833
	ta_status.state = STATE_EXPECT_VERTEX_BLOCK2;
nkeynes@189
   834
	break;
nkeynes@189
   835
    case TA_VERTEX_TEX_UV16_SPEC_INTENSITY_MOD:
nkeynes@189
   836
	vertex->detail[2] = parse_intensity_colour( ta_status.intensity1, data[7].f );
nkeynes@189
   837
	/* Fallthrough */
nkeynes@189
   838
    case TA_VERTEX_TEX_UV16_INTENSITY_MOD:
nkeynes@189
   839
	vertex->detail[0] = data[4].i; /* UV0 */
nkeynes@189
   840
	vertex->detail[1] = parse_intensity_colour( ta_status.intensity1, data[6].f );
nkeynes@189
   841
	ta_status.state = STATE_EXPECT_VERTEX_BLOCK2;
nkeynes@189
   842
	break;
nkeynes@189
   843
	
nkeynes@189
   844
    case TA_VERTEX_SPRITE:
nkeynes@189
   845
    case TA_VERTEX_TEX_SPRITE:
nkeynes@189
   846
    case TA_VERTEX_MOD_VOLUME:
nkeynes@189
   847
	vertex++;
nkeynes@189
   848
	vertex->x = data[4].f;
nkeynes@189
   849
	vertex->y = data[5].f;
nkeynes@189
   850
	vertex->z = data[6].f;
nkeynes@189
   851
	vertex++;
nkeynes@189
   852
	vertex->x = data[7].f;
nkeynes@189
   853
	ta_status.vertex_count += 2;
nkeynes@189
   854
	ta_status.state = STATE_EXPECT_VERTEX_BLOCK2;
nkeynes@189
   855
	break;
nkeynes@189
   856
    }
nkeynes@189
   857
    ta_status.vertex_count++;
nkeynes@189
   858
}
nkeynes@189
   859
nkeynes@189
   860
static void ta_parse_vertex_block2( union ta_data *data ) {
nkeynes@189
   861
    struct pvr2_ta_vertex *vertex = &ta_status.poly_vertex[ta_status.vertex_count-1];
nkeynes@189
   862
nkeynes@189
   863
    switch( ta_status.current_vertex_type ) {
nkeynes@189
   864
    case TA_VERTEX_TEX_SPEC_FLOAT:
nkeynes@189
   865
	vertex->detail[3] = parse_float_colour( data[4].f, data[5].f, data[6].f, data[7].f );
nkeynes@189
   866
	/* Fallthrough */
nkeynes@189
   867
    case TA_VERTEX_TEX_FLOAT:
nkeynes@189
   868
	vertex->detail[2] = parse_float_colour( data[0].f, data[1].f, data[2].f, data[3].f );
nkeynes@189
   869
	break;
nkeynes@189
   870
    case TA_VERTEX_TEX_UV16_SPEC_FLOAT:
nkeynes@189
   871
	vertex->detail[2] = 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_UV16_FLOAT:
nkeynes@189
   874
	vertex->detail[1] = 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_PACKED_MOD:
nkeynes@189
   877
	vertex->detail[3] = data[0].i; /* U1 */
nkeynes@189
   878
	vertex->detail[4] = data[1].i; /* V1 */
nkeynes@189
   879
	vertex->detail[5] = data[2].i; /* ARGB1 */
nkeynes@189
   880
	break;
nkeynes@189
   881
    case TA_VERTEX_TEX_SPEC_PACKED_MOD:
nkeynes@189
   882
	vertex->detail[4] = data[0].i; /* U1 */
nkeynes@189
   883
	vertex->detail[5] = data[1].i; /* V1 */
nkeynes@189
   884
	vertex->detail[6] = data[2].i; /* ARGB1 */
nkeynes@189
   885
	vertex->detail[7] = data[3].i; /* ARGB1 */
nkeynes@189
   886
	break;
nkeynes@189
   887
    case TA_VERTEX_TEX_UV16_PACKED_MOD:
nkeynes@189
   888
	vertex->detail[2] = data[0].i; /* UV1 */
nkeynes@189
   889
	vertex->detail[3] = data[2].i; /* ARGB1 */
nkeynes@189
   890
	break;
nkeynes@189
   891
    case TA_VERTEX_TEX_UV16_SPEC_PACKED_MOD:
nkeynes@189
   892
	vertex->detail[3] = data[0].i; /* UV1 */
nkeynes@189
   893
	vertex->detail[4] = data[2].i; /* ARGB1 */
nkeynes@189
   894
	vertex->detail[5] = data[3].i; /* ARGB1 */
nkeynes@189
   895
	break;
nkeynes@189
   896
nkeynes@189
   897
    case TA_VERTEX_TEX_INTENSITY_MOD:
nkeynes@189
   898
	vertex->detail[3] = data[0].i; /* U1 */
nkeynes@189
   899
	vertex->detail[4] = data[1].i; /* V1 */
nkeynes@189
   900
	vertex->detail[5] = parse_intensity_colour( ta_status.intensity2, data[2].f ); /* ARGB1 */
nkeynes@189
   901
	break;
nkeynes@189
   902
    case TA_VERTEX_TEX_SPEC_INTENSITY_MOD:
nkeynes@189
   903
	vertex->detail[4] = data[0].i; /* U1 */
nkeynes@189
   904
	vertex->detail[5] = data[1].i; /* V1 */
nkeynes@189
   905
	vertex->detail[6] = parse_intensity_colour( ta_status.intensity2, data[2].f ); /* ARGB1 */
nkeynes@189
   906
	vertex->detail[7] = parse_intensity_colour( ta_status.intensity2, data[3].f ); /* ARGB1 */
nkeynes@189
   907
	break;
nkeynes@189
   908
    case TA_VERTEX_TEX_UV16_INTENSITY_MOD:
nkeynes@189
   909
	vertex->detail[2] = data[0].i; /* UV1 */
nkeynes@189
   910
	vertex->detail[3] = parse_intensity_colour( ta_status.intensity2, data[2].f ); /* ARGB1 */
nkeynes@189
   911
	break;
nkeynes@189
   912
    case TA_VERTEX_TEX_UV16_SPEC_INTENSITY_MOD:
nkeynes@189
   913
	vertex->detail[3] = data[0].i; /* UV1 */
nkeynes@189
   914
	vertex->detail[4] = parse_intensity_colour( ta_status.intensity2, data[2].f ); /* ARGB1 */
nkeynes@189
   915
	vertex->detail[5] = parse_intensity_colour( ta_status.intensity2, data[3].f ); /* ARGB1 */
nkeynes@189
   916
	break;
nkeynes@189
   917
nkeynes@189
   918
    case TA_VERTEX_SPRITE:
nkeynes@189
   919
	vertex->y = data[0].f;
nkeynes@189
   920
	vertex->z = data[1].f;
nkeynes@189
   921
	vertex++;
nkeynes@189
   922
	ta_status.vertex_count++;
nkeynes@189
   923
	vertex->x = data[2].f;
nkeynes@189
   924
	vertex->y = data[3].f;
nkeynes@189
   925
	vertex->z = 0;
nkeynes@189
   926
	vertex->detail[0] = 0;
nkeynes@189
   927
	ta_status.poly_vertex[0].detail[0] = 0;
nkeynes@189
   928
	ta_status.poly_vertex[1].detail[0] = 0;
nkeynes@189
   929
	break;
nkeynes@189
   930
    case TA_VERTEX_TEX_SPRITE:
nkeynes@189
   931
	vertex->y = data[0].f;
nkeynes@189
   932
	vertex->z = data[1].f;
nkeynes@189
   933
	vertex++;
nkeynes@189
   934
	ta_status.vertex_count++;
nkeynes@189
   935
	vertex->x = data[2].f;
nkeynes@189
   936
	vertex->y = data[3].f;
nkeynes@189
   937
	vertex->z = 0;
nkeynes@189
   938
	vertex->detail[0] = 0;
nkeynes@189
   939
	vertex->detail[1] = 0;
nkeynes@189
   940
	ta_status.poly_vertex[0].detail[0] = data[5].i;
nkeynes@189
   941
	ta_status.poly_vertex[0].detail[1] = 0;
nkeynes@189
   942
	ta_status.poly_vertex[1].detail[0] = data[6].i;
nkeynes@189
   943
	ta_status.poly_vertex[1].detail[1] = 0;
nkeynes@189
   944
	ta_status.poly_vertex[2].detail[0] = data[7].i;
nkeynes@189
   945
	break;
nkeynes@189
   946
    case TA_VERTEX_MOD_VOLUME:
nkeynes@189
   947
	vertex->y = data[0].f;
nkeynes@189
   948
	vertex->z = data[1].f;
nkeynes@189
   949
	break;
nkeynes@189
   950
    }
nkeynes@194
   951
    ta_status.state = STATE_IN_POLYGON;
nkeynes@189
   952
}
nkeynes@189
   953
nkeynes@189
   954
/**
nkeynes@189
   955
 * Process 1 32-byte block of ta data
nkeynes@189
   956
 */
nkeynes@189
   957
void pvr2_ta_process_block( char *input ) {
nkeynes@189
   958
    union ta_data *data = (union ta_data *)input;
nkeynes@189
   959
nkeynes@189
   960
    switch( ta_status.state ) {
nkeynes@189
   961
    case STATE_ERROR:
nkeynes@189
   962
	/* Error raised - stop processing until reset */
nkeynes@189
   963
	return;
nkeynes@189
   964
nkeynes@189
   965
    case STATE_EXPECT_POLY_BLOCK2:
nkeynes@189
   966
	/* This is always a pair of floating-point colours */
nkeynes@189
   967
	ta_status.intensity1 = 
nkeynes@189
   968
	    parse_float_colour( data[0].f, data[1].f, data[2].f, data[3].f );
nkeynes@189
   969
	ta_status.intensity2 =
nkeynes@189
   970
	    parse_float_colour( data[4].f, data[5].f, data[6].f, data[7].f );
nkeynes@189
   971
	ta_status.state = STATE_IN_LIST;
nkeynes@189
   972
	break;
nkeynes@189
   973
nkeynes@189
   974
    case STATE_EXPECT_VERTEX_BLOCK2:
nkeynes@189
   975
	ta_parse_vertex_block2( data );
nkeynes@189
   976
	if( ta_status.vertex_count == ta_status.max_vertex ) {
nkeynes@189
   977
	    ta_split_polygon();
nkeynes@189
   978
	}
nkeynes@189
   979
	break;
nkeynes@189
   980
nkeynes@189
   981
    case STATE_EXPECT_END_VERTEX_BLOCK2:
nkeynes@189
   982
	ta_parse_vertex_block2( data );
nkeynes@189
   983
	ta_commit_polygon();
nkeynes@189
   984
	ta_status.vertex_count = 0;
nkeynes@189
   985
	ta_status.poly_parity = 0;
nkeynes@194
   986
	ta_status.state = STATE_IN_LIST;
nkeynes@194
   987
	break;
nkeynes@189
   988
    case STATE_IN_LIST:
nkeynes@194
   989
    case STATE_IN_POLYGON:
nkeynes@189
   990
    case STATE_IDLE:
nkeynes@189
   991
	switch( TA_CMD( data->i ) ) {
nkeynes@189
   992
	case TA_CMD_END_LIST:
nkeynes@189
   993
	    ta_end_list();
nkeynes@189
   994
	    break;
nkeynes@198
   995
	case TA_CMD_CLIP:
nkeynes@198
   996
	    if( ta_status.state == STATE_IN_POLYGON ) {
nkeynes@198
   997
		asic_event( EVENT_PVR_BAD_INPUT );
nkeynes@198
   998
		asic_event( EVENT_TA_ERROR );
nkeynes@198
   999
		/* Enter stuffed up mode */
nkeynes@198
  1000
	    }
nkeynes@198
  1001
	    ta_status.clip.x1 = data[4].i & 0x3F;
nkeynes@198
  1002
	    ta_status.clip.y1 = data[5].i & 0x0F;
nkeynes@198
  1003
	    ta_status.clip.x2 = data[6].i & 0x3F;
nkeynes@198
  1004
	    ta_status.clip.y2 = data[7].i & 0x0F;
nkeynes@189
  1005
	    break;
nkeynes@189
  1006
	case TA_CMD_POLYGON_CONTEXT:
nkeynes@189
  1007
	    if( ta_status.state == STATE_IDLE ) {
nkeynes@189
  1008
		ta_init_list( TA_POLYCMD_LISTTYPE( data->i ) );
nkeynes@189
  1009
	    }
nkeynes@189
  1010
	    
nkeynes@189
  1011
	    if( ta_status.vertex_count != 0 ) {
nkeynes@193
  1012
		/* Error, and not a very well handled one either */
nkeynes@193
  1013
		asic_event( EVENT_PVR_BAD_INPUT );
nkeynes@193
  1014
		asic_event( EVENT_TA_ERROR );
nkeynes@193
  1015
		ta_status.accept_vertexes = FALSE;
nkeynes@189
  1016
		ta_fill_vertexes();
nkeynes@189
  1017
	    } else {
nkeynes@193
  1018
		if( TA_IS_MODIFIER_LIST( ta_status.current_list_type ) ) {
nkeynes@193
  1019
		    ta_parse_modifier_context(data);
nkeynes@193
  1020
		} else {
nkeynes@193
  1021
		    ta_parse_polygon_context(data);
nkeynes@193
  1022
		}
nkeynes@189
  1023
	    }
nkeynes@189
  1024
	    break;
nkeynes@189
  1025
	case TA_CMD_SPRITE_CONTEXT:
nkeynes@189
  1026
	    if( ta_status.state == STATE_IDLE ) {
nkeynes@189
  1027
		ta_init_list( TA_POLYCMD_LISTTYPE( data->i ) );
nkeynes@189
  1028
	    }
nkeynes@189
  1029
nkeynes@189
  1030
	    if( ta_status.vertex_count != 0 ) {
nkeynes@189
  1031
		ta_fill_vertexes();
nkeynes@189
  1032
		ta_commit_polygon();
nkeynes@189
  1033
	    }
nkeynes@189
  1034
nkeynes@189
  1035
	    ta_parse_sprite_context(data);
nkeynes@189
  1036
	    break;
nkeynes@189
  1037
	case TA_CMD_VERTEX:
nkeynes@194
  1038
	    ta_status.state = STATE_IN_POLYGON;
nkeynes@189
  1039
	    ta_parse_vertex(data);
nkeynes@189
  1040
	    
nkeynes@189
  1041
	    if( ta_status.state == STATE_EXPECT_VERTEX_BLOCK2 ) {
nkeynes@189
  1042
		if( TA_IS_END_VERTEX(data[0].i) ) {
nkeynes@189
  1043
		    ta_status.state = STATE_EXPECT_END_VERTEX_BLOCK2;
nkeynes@189
  1044
		}
nkeynes@189
  1045
	    } else if( TA_IS_END_VERTEX(data->i) ) {
nkeynes@189
  1046
		ta_commit_polygon();
nkeynes@189
  1047
		ta_status.vertex_count = 0;
nkeynes@189
  1048
		ta_status.poly_parity = 0;
nkeynes@194
  1049
		ta_status.state = STATE_IN_LIST;
nkeynes@189
  1050
	    } else if( ta_status.vertex_count == ta_status.max_vertex ) {
nkeynes@189
  1051
		ta_split_polygon();
nkeynes@189
  1052
	    }
nkeynes@189
  1053
	    break;
nkeynes@189
  1054
	}
nkeynes@189
  1055
	break;
nkeynes@189
  1056
    }
nkeynes@189
  1057
nkeynes@189
  1058
}
nkeynes@189
  1059
nkeynes@189
  1060
nkeynes@189
  1061
nkeynes@189
  1062
/**
nkeynes@189
  1063
 * Write a block of data to the tile accelerator, adding the data to the 
nkeynes@189
  1064
 * current scene. We don't make any particular attempt to interpret the data
nkeynes@189
  1065
 * at this stage, deferring that until render time.
nkeynes@189
  1066
 *
nkeynes@189
  1067
 * Currently copies the data verbatim to the vertex buffer, processing only
nkeynes@189
  1068
 * far enough to generate the correct end-of-list events. Tile buffer is
nkeynes@189
  1069
 * entirely ignored.
nkeynes@189
  1070
 */
nkeynes@189
  1071
void pvr2_ta_write( char *buf, uint32_t length )
nkeynes@189
  1072
{
nkeynes@189
  1073
    if( ta_status.debug_output ) {
nkeynes@189
  1074
	fwrite_dump32( (uint32_t *)buf, length, stderr );
nkeynes@189
  1075
    }
nkeynes@189
  1076
nkeynes@189
  1077
    for( ; length >=32; length -= 32 ) {
nkeynes@189
  1078
	pvr2_ta_process_block( buf );
nkeynes@189
  1079
	buf += 32;
nkeynes@189
  1080
    }
nkeynes@189
  1081
}
.