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// Copyright 2008-2010 Segher Boessenkool <segher@kernel.crashing.org>
// Licensed under the terms of the GNU GPL, version 2
// http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "types.h"
#include "emu.h"
#include "platform.h"
#include "video.h"
u32 palette_rgb[256];
u32 screen[320*240];
int hide_page_1;
int hide_page_2;
int hide_sprites;
int show_fps = 1;
int trace_unknown_video = 1;
static const u8 sizes[] = { 8, 16, 32, 64 };
static const u8 colour_sizes[] = { 2, 4, 6, 8 };
static const u16 known_reg_bits[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 2800..280f
0xffff, 0xffff, 0x3fff, 0x011e, 0x3fff, 0x3fff, // 2810..2815 text page 1
0xffff, 0xffff, 0x3fff, 0x011e, 0x3fff, 0x3fff, // 2816..281b text page 2
0x00ff, // 281c vcmp value
0, 0, 0, // 281d..281f
0xffff, 0xffff, 0xffff, // 2820..2822
0, 0, 0, 0, 0, 0, 0, // 2823..2829
0x0003, // 282a blend level
0, 0, 0, 0, 0, // 282b..282f
0x00ff, // 2830 fade offset
0, 0, 0, 0, 0, // 2831..2835
0xffff, 0xffff, // 2836..2837 IRQ pos
0, 0, 0, 0, // 2838..283b
0xffff, // 283c TV hue/saturation
0, 0, 0, // 283d..283f
0, 0, // 2840..2841
0x0001, // 2842
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 2843..284f
0, 0, 0, 0, // 2850..2853
0x0007, // 2854 LCD control
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 2855..285f
0, 0, // 2860..2861
0x0007, 0x0007, // 2862..2863
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 2864..286f
0x3fff, 0x03ff, 0x03ff, // 2870..2872 DMA
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 2873..287f
};
static const u16 known_sprite_bits[] = {
0xffff, 0xffff, 0xffff, 0xffff // actually only low 9 bits of X/Y, low 15 of attr
};
static void trace_unknown(u32 addr, u16 val, int is_read)
{
if (addr >= 0x2800 && addr < 0x2800 + ARRAY_SIZE(known_reg_bits)) {
if (val & ~known_reg_bits[addr - 0x2800])
printf("*** UNKNOWN VIDEO REG BITS %s: %04x bits %04x\n",
is_read ? "READ" : "WRITE", addr,
val & ~known_reg_bits[addr - 0x2800]);
} else if (addr >= 0x2900 && addr < 0x2a00) {
if (val & ~0xffff)
printf("*** UNKNOWN VIDEO HOFFSET BITS %s: %04x bits %04x\n",
is_read ? "READ" : "WRITE", addr, val & ~0x01ff);
} else if (addr >= 0x2a00 && addr < 0x2b00) {
if (val & ~0x00ff)
printf("*** UNKNOWN VIDEO HCMP BITS %s: %04x bits %04x\n",
is_read ? "READ" : "WRITE", addr, val & ~0x00ff);
} else if (addr >= 0x2b00 && addr < 0x2c00) {
if (val & ~0xffff)
printf("*** UNKNOWN VIDEO PALETTE BITS %s: %04x bits %04x\n",
is_read ? "READ" : "WRITE", addr, val & ~0xffff);
} else if (addr >= 0x2c00 && addr < 0x3000) {
if (val != 0xffff && val & ~known_sprite_bits[addr & 3])
printf("*** UNKNOWN VIDEO SPRITE BITS %s: %04x bits %04x\n",
is_read ? "READ" : "WRITE", addr,
val & ~known_sprite_bits[addr & 3]);
} else
printf("*** UNKNOWN VIDEO %s: [%04x] = %04x\n",
is_read ? "READ" : "WRITE", addr, val);
}
static void do_dma(u32 len)
{
u32 src = mem[0x2870];
u32 dst = mem[0x2871] + 0x2c00;
u32 j;
for (j = 0; j < len; j++)
mem[dst+j] = mem[src+j];
mem[0x2872] = 0;
mem[0x2863] |= 4; // trigger video DMA IRQ
}
void video_store(u16 val, u32 addr)
{
if (trace_unknown_video)
trace_unknown(addr, val, 0);
if (addr < 0x2900) { // video regs
switch (addr) {
case 0x2810: case 0x2816: // page 1,2 X scroll
val &= 0x01ff;
break;
case 0x2811: case 0x2817: // page 1,2 Y scroll
val &= 0x00ff;
break;
case 0x2812 ... 0x2815: // page 1 regs
case 0x2818 ... 0x281b: // page 2 regs
break;
case 0x281c: // vcmp value
break;
case 0x2820 ... 0x2822: // bitmap offsets
break;
case 0x282a: // blend level
break;
case 0x2830: // fade offset
if ((mem[addr] & 0x00ff) != (val & 0x00ff))
printf("*** TV FADE set to %02x\n", val & 0x00ff);
break;
case 0x2836: // IRQ pos V
case 0x2837: // IRQ pos H
val &= 0x01ff;
break;
case 0x283c: // TV control 1 (hue/saturation)
if ((mem[addr] & 0xff00) != (val & 0xff00))
printf("*** TV HUE set to %02x\n", val >> 8);
if ((mem[addr] & 0x00ff) != (val & 0x00ff))
printf("*** TV SATURATION set to %02x\n", val & 0x00ff);
break;
case 0x283d: // XXX TV control 2
break;
case 0x283e: // XXX lightpen pos V
case 0x283f: // XXX lightpen pos H
break;
case 0x2842: // XXX sprite enable
break;
case 0x2854: { // LCD control
static const char *lcd_colour_mode[4] = {
"B/W", "16 grey levels", "4096 colours", "BAD"
};
if ((mem[addr] & 0x0003) != (val & 0x0003))
printf("*** LCD COLOUR MODE set to %s\n",
lcd_colour_mode[val & 0x0003]);
if ((mem[addr] & 0x0004) != (val & 0x0004))
printf("*** LCD RESOLUTION set to %s\n",
(val & 0x0004) ? "320x240" : "160x100");
break;
}
case 0x2862: // video IRQ control
break;
case 0x2863: // video IRQ status
mem[addr] &= ~val;
return;
case 0x2870: // video DMA src
case 0x2871: // video DMA dst
break;
case 0x2872: // video DMA len
do_dma(val);
return;
default:
printf("VIDEO STORE %04x to %04x\n", val, addr);
}
} else if (addr < 0x2a00) { // scroll per raster line
} else if (addr < 0x2b00) { // horizontal stretch
} else if (addr < 0x2c00) { // palette
} else { // sprites
}
mem[addr] = val;
}
u16 video_load(u32 addr)
{
u16 val = mem[addr];
if (trace_unknown_video)
trace_unknown(addr, val, 1);
if (addr < 0x2900) {
switch (addr) {
case 0x2810 ... 0x2815: // page 1 regs
case 0x2816 ... 0x281b: // page 2 regs
break;
case 0x282a: // blend level
break;
case 0x2838: // current line
return get_video_line();
case 0x2842: // XXX
break;
case 0x2862: // video IRQ enable
break;
case 0x2863: // video IRQ status
break;
case 0x2872: // DMA len
break;
default:
printf("VIDEO LOAD %04x from %04x\n", val, addr);
}
}
return val;
}
void render_bitmap(u8 *dest, u32 pitch, u32 addr, u16 attr)
{
u32 h = sizes[(attr & 0x00c0) >> 6];
u32 w = sizes[(attr & 0x0030) >> 4];
u32 yflipmask = attr & 0x0008 ? h - 1 : 0;
u32 xflipmask = attr & 0x0004 ? w - 1 : 0;
u32 nc = colour_sizes[attr & 0x0003];
u32 m = addr;
u32 bits = 0;
u32 nbits = 0;
for (u32 y = 0; y < h; y++) {
u32 yy = y ^ yflipmask;
for (u32 x = 0; x < w; x++) {
u32 xx = x ^ xflipmask;
bits <<= nc;
if (nbits < nc) {
u16 b = mem[m++ & 0x3fffff];
b = (b << 8) | (b >> 8);
bits |= b << (nc - nbits);
nbits += 16;
}
nbits -= nc;
dest[pitch*yy + xx] = bits >> 16;
bits &= 0xffff;
}
}
}
void video_init(void)
{
mem[0x2836] = 0xffff;
mem[0x2837] = 0xffff;
}
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