[a06aa8b] | 1 | /*
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| 2 | * Copyright (C) 2017 The Contributors
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| 3 | *
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| 4 | * This program is free software: you can redistribute it and/or modify
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| 5 | * it under the terms of the GNU General Public License as published by
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| 6 | * the Free Software Foundation, either version 3 of the License, or (at
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| 7 | * your option) any later version.
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| 8 | *
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| 9 | * This program is distributed in the hope that it will be useful, but
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| 10 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 12 | * General Public License for more details.
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| 13 | *
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| 14 | * A copy of the GNU General Public License can be found in the file
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[2147e53] | 15 | * "gpl.txt" in the top directory of this repository.
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[a06aa8b] | 16 | */
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| 17 |
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| 18 | #include <all.h>
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| 19 |
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[4c71d39] | 20 | #define ver(...) _ver(vid_verbose, 0, __VA_ARGS__)
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| 21 | #define ver2(...) _ver(vid_verbose, 1, __VA_ARGS__)
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| 22 | #define ver3(...) _ver(vid_verbose, 2, __VA_ARGS__)
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[a06aa8b] | 23 |
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[4c71d39] | 24 | int32_t vid_verbose = 0;
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[a06aa8b] | 25 |
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[ac4e192] | 26 | #define SCR_W 512
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| 27 | #define SCR_H 350
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| 28 | #define VBL_H 50
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| 29 |
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| 30 | #define REG_VCR0 0
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| 31 | #define REG_VCR1 1
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| 32 | #define REG_RWBA 2
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| 33 | #define REG_DSBA 5
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| 34 | #define REG_ODTBA 7
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| 35 | #define REG_ATBA 8
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[b6f5f64] | 36 | #define REG_CGBA 10
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[ac4e192] | 37 | #define REG_ATBAC 11
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| 38 |
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| 39 | #define VCR0_UCF 0x0001
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| 40 | #define VCR0_DEN 0x0008
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| 41 |
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| 42 | #define DSBA_BS1 0x0080
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| 43 | #define DSBA_BS0 0x0100
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| 44 |
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| 45 | #define REG_OFF 0x200
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| 46 | #define PAL_OFF 0x40000
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| 47 |
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[f285858] | 48 | #define OD0_TDE 0x0004
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[ac4e192] | 49 | #define OD0_BLA 0x0010
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[f285858] | 50 | #define OD0_CB 0x0800
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[ac4e192] | 51 |
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[fffab34] | 52 | #define AT_UND 0x0100
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[b6f5f64] | 53 | #define AT_CG 0x8000
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| 54 |
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[ac4e192] | 55 | #define WIN_SZ_W 0x10000
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| 56 | #define MEM_SZ_W 0x20000
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| 57 |
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| 58 | #define N_BANKS 2
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| 59 |
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[f285858] | 60 | #define SCALE(_x) (_x * 2)
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| 61 |
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| 62 | #define WIN_W SCALE(SCR_W)
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| 63 | #define WIN_H SCALE(SCR_H)
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| 64 |
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| 65 | typedef struct {
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| 66 | int32_t x, y, w, h;
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| 67 | uint16_t *mem;
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| 68 | bool tran;
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[b6f5f64] | 69 | int32_t fon_h;
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| 70 | } obj_t;
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[f285858] | 71 |
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[ac4e192] | 72 | static int32_t reg_off = REG_OFF;
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| 73 |
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| 74 | static uint16_t mem[MEM_SZ_W];
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| 75 | static int32_t bank = 0;
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| 76 |
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[f285858] | 77 | static uint32_t pal[16];
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| 78 |
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[b6f5f64] | 79 | static obj_t objs[16];
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| 80 | static int32_t n_objs = 0;
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[f285858] | 81 |
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| 82 | static SDL_Window *win;
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[4ed9bfe] | 83 | uint32_t vid_win;
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| 84 |
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[f285858] | 85 | static SDL_Renderer *ren;
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| 86 | static SDL_Texture *tex;
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| 87 | static SDL_atomic_t frame;
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| 88 |
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[b6f5f64] | 89 | static void rend_bm(uint16_t *vid, int32_t w, int32_t h, uint32_t *pix, int32_t pitch)
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| 90 | {
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| 91 | for (int32_t y = 0; y < h; ++y) {
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| 92 | for (int32_t x = 0; x < w / 4; ++x) {
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| 93 | uint16_t v4 = *vid++;
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| 94 |
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| 95 | *pix++ = pal[(v4 & 0x000f) >> 0];
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| 96 | *pix++ = pal[(v4 & 0x00f0) >> 4];
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| 97 | *pix++ = pal[(v4 & 0x0f00) >> 8];
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| 98 | *pix++ = pal[(v4 & 0xf000) >> 12];
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| 99 | }
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| 100 |
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| 101 | pix += pitch / 4 - w;
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| 102 | }
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| 103 | }
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| 104 |
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| 105 | static void rend_tx(uint16_t *vid, int32_t w, int32_t h, int32_t fon_h,
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| 106 | uint32_t *pix, int32_t pitch)
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| 107 | {
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| 108 | int32_t cgba = mem[REG_CGBA];
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| 109 |
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| 110 | uint16_t *cg0 = mem + ((cgba & 0x00f0) << 8);
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| 111 | uint16_t *cg1 = mem + ((cgba & 0x000f) << 12);
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| 112 |
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| 113 | int32_t line = fon_h - 1;
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| 114 |
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| 115 | for (int32_t y = 0; y < h; ++y) {
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| 116 | uint16_t *walk = vid;
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| 117 |
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| 118 | for (int32_t col2 = 0; col2 < w / 16; ++col2) {
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| 119 | uint16_t ch2 = *walk++;
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| 120 |
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| 121 | for (int32_t i = 0; i < 2; ++i) {
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| 122 | int32_t ch = (uint8_t)ch2;
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| 123 | int32_t at = *walk++;
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| 124 |
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| 125 | int32_t bg = at & 0x000f;
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| 126 | int32_t fg = (at & 0x00f0) >> 4;
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| 127 |
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[fffab34] | 128 | int32_t bits;
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| 129 |
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| 130 | if ((at & AT_UND) != 0 && line == 1) {
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| 131 | bits = 0xff;
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| 132 | }
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| 133 | else {
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| 134 | uint16_t *cg = (at & AT_CG) != 0 ? cg0 : cg1;
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| 135 | bits = cg[256 * line + ch];
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| 136 | }
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| 137 |
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[b6f5f64] | 138 | int32_t mask = 0x01;
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| 139 |
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| 140 | for (int32_t k = 0; k < 8; ++k) {
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| 141 | *pix++ = (bits & mask) != 0 ? pal[fg] : pal[bg];
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| 142 | mask <<= 1;
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| 143 | }
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| 144 |
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| 145 | ch2 >>= 8;
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| 146 | }
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| 147 | }
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| 148 |
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| 149 | if (--line < 0) {
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| 150 | line = fon_h - 1;
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| 151 | vid = walk;
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| 152 | }
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| 153 |
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| 154 | pix += pitch / 4 - w;
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| 155 | }
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| 156 | }
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| 157 |
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[f285858] | 158 | void vid_sdl(void)
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| 159 | {
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| 160 | ver3("vid_sdl()");
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| 161 |
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| 162 | static int32_t last = 0;
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| 163 | int32_t now = SDL_AtomicGet(&frame);
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| 164 |
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| 165 | if (last == now) {
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| 166 | ver3("no update");
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| 167 | return;
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| 168 | }
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| 169 |
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| 170 | last = now;
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| 171 |
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| 172 | if (SDL_RenderFillRect(ren, NULL) < 0) {
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| 173 | fail("SDL_RenderFillRect() failed: %s", SDL_GetError());
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| 174 | }
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| 175 |
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| 176 | if (SDL_LockMutex(cpu_mutex) < 0) {
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| 177 | fail("SDL_LockMutex() failed: %s", SDL_GetError());
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| 178 | }
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| 179 |
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[b6f5f64] | 180 | for (int32_t i = 0; i < n_objs; ++i) {
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| 181 | obj_t *obj = objs + i;
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[f285858] | 182 |
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[b6f5f64] | 183 | pal[0] = obj->tran ? pal[0] & 0xffffff00 : pal[0] | 0x000000ff;
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[f285858] | 184 |
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| 185 | SDL_Rect src = {
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[b6f5f64] | 186 | .x = 0, .y = 0, .w = obj->w, .h = obj->h
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[f285858] | 187 | };
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| 188 |
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[b6f5f64] | 189 | void *buf;
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| 190 | int32_t pitch;
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| 191 |
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[f285858] | 192 | if (SDL_LockTexture(tex, &src, &buf, &pitch) < 0) {
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| 193 | fail("SDL_LockTexture() failed: %s", SDL_GetError());
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| 194 | }
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| 195 |
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[b6f5f64] | 196 | if (obj->fon_h < 0) {
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| 197 | rend_bm(obj->mem, obj->w, obj->h, buf, pitch);
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| 198 | }
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| 199 | else {
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| 200 | rend_tx(obj->mem, obj->w, obj->h, obj->fon_h, buf, pitch);
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[f285858] | 201 | }
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| 202 |
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| 203 | SDL_UnlockTexture(tex);
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| 204 |
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| 205 | SDL_Rect dst = {
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[b6f5f64] | 206 | .x = SCALE(obj->x), .y = SCALE(obj->y),
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| 207 | .w = SCALE(obj->w), .h = SCALE(obj->h)
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[f285858] | 208 | };
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| 209 |
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| 210 | ver2("vid rend %d %dx%d -> (%d, %d) (%d, %d) %dx%d",
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| 211 | i,
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[b6f5f64] | 212 | obj->w, obj->h,
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| 213 | obj->x, obj->y,
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| 214 | SCALE(obj->x), SCALE(obj->y),
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| 215 | SCALE(obj->w), SCALE(obj->h));
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[f285858] | 216 |
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| 217 | if (SDL_RenderCopy(ren, tex, &src, &dst) < 0) {
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| 218 | fail("SDL_RenderCopy() failed: %s", SDL_GetError());
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| 219 | }
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| 220 | }
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| 221 |
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| 222 | if (SDL_UnlockMutex(cpu_mutex) < 0) {
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| 223 | fail("SDL_UnlockMutex() failed: %s", SDL_GetError());
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| 224 | }
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| 225 |
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| 226 | SDL_RenderPresent(ren);
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| 227 | }
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[ac4e192] | 228 |
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[a06aa8b] | 229 | void vid_init(void)
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| 230 | {
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| 231 | ver("vid init");
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[f285858] | 232 |
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| 233 | win = SDL_CreateWindow("Display", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
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| 234 | WIN_W, WIN_H, 0);
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| 235 |
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| 236 | if (win == NULL) {
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| 237 | fail("SDL_CreateWindow() failed: %s", SDL_GetError());
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| 238 | }
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[4ed9bfe] | 239 |
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| 240 | vid_win = SDL_GetWindowID(win);
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| 241 |
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| 242 | if (vid_win == 0) {
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| 243 | fail("SDL_GetWindowID() failed: %s", SDL_GetError());
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| 244 | }
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[f285858] | 245 |
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| 246 | ren = SDL_CreateRenderer(win, -1, 0);
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| 247 |
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| 248 | if (ren == NULL) {
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| 249 | fail("SDL_CreateRenderer() failed: %s", SDL_GetError());
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| 250 | }
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| 251 |
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| 252 | if (SDL_SetRenderDrawColor(ren, 0x00, 0x00, 0x00, 0xff) < 0) {
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| 253 | fail("SDL_SetRenderDrawColor() failed: %s", SDL_GetError());
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| 254 | }
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| 255 |
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| 256 | tex = SDL_CreateTexture(ren, SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_STREAMING,
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| 257 | SCR_W, SCR_H);
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| 258 |
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| 259 | if (tex == NULL) {
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| 260 | fail("SDL_CreateTexture() failed: %s", SDL_GetError());
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| 261 | }
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| 262 |
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| 263 | if (SDL_SetTextureBlendMode(tex, SDL_BLENDMODE_BLEND) < 0) {
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| 264 | fail("SDL_SetTextureBlendMode() failed: %s", SDL_GetError());
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| 265 | }
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| 266 |
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| 267 | SDL_AtomicSet(&frame, 1);
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[a06aa8b] | 268 | }
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| 269 |
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| 270 | void vid_quit(void)
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| 271 | {
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| 272 | ver("vid quit");
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[f285858] | 273 |
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| 274 | SDL_DestroyTexture(tex);
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| 275 | SDL_DestroyRenderer(ren);
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| 276 | SDL_DestroyWindow(win);
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[a06aa8b] | 277 | }
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| 278 |
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[3c30832] | 279 | bool vid_exec(void)
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[a06aa8b] | 280 | {
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[4c71d39] | 281 | ver3("vid exec");
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[ac4e192] | 282 |
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| 283 | static int32_t skip = 99999;
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| 284 | static int32_t line = 99999;
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| 285 |
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| 286 | if (++skip < 10) {
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| 287 | ver3("vid skip %d", skip);
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| 288 | return false;
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| 289 | }
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| 290 |
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| 291 | skip = 0;
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| 292 | int32_t vcr0 = mem[REG_VCR0];
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| 293 |
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| 294 | if ((vcr0 & VCR0_DEN) == 0) {
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| 295 | ver3("vid dis");
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| 296 | return false;
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| 297 | }
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| 298 |
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| 299 | if (++line < SCR_H + VBL_H) {
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| 300 | ver3("vid line %d", line);
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| 301 |
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| 302 | if (line < SCR_H) {
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| 303 | ++mem[REG_ATBAC];
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| 304 | }
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| 305 |
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| 306 | return line == SCR_H;
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| 307 | }
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| 308 |
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| 309 | // We get here every 4,000 invocations -> 25 fps.
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| 310 |
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| 311 | ver2("vid frame");
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| 312 | line = 0;
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| 313 |
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| 314 | int32_t dsba = mem[REG_DSBA];
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| 315 | bank = ((dsba & DSBA_BS0) != 0 ? 1 : 0) + ((dsba & DSBA_BS1) != 0 ? 2 : 0);
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| 316 |
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| 317 | int32_t rwba = mem[REG_RWBA];
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| 318 | reg_off = (rwba & 0xfff0) << 1;
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| 319 |
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| 320 | int32_t atba = mem[REG_ATBA];
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| 321 | mem[REG_ATBAC] = (uint16_t)atba;
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| 322 |
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| 323 | int32_t odtba = mem[REG_ODTBA] & 0xffc0;
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[f285858] | 324 |
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[b6f5f64] | 325 | n_objs = 0;
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[ac4e192] | 326 |
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| 327 | for (int32_t i = 0; i < 16; ++i) {
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[f285858] | 328 | int32_t flips[SCR_H];
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| 329 | int32_t n_flips = 0;
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[ac4e192] | 330 |
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| 331 | uint16_t *od = mem + odtba + 4 * i;
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| 332 |
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| 333 | if ((od[0] & OD0_BLA) != 0) {
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[f285858] | 334 | ver3("vid obj %d blanked", i);
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[ac4e192] | 335 | continue;
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| 336 | }
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| 337 |
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[4f967e8] | 338 | int32_t w64 = (od[1] & 0xfc00) >> 10;
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[ac4e192] | 339 |
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[4f967e8] | 340 | if (w64 == 0) {
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[f285858] | 341 | ver3("vid obj %d empty", i);
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[ac4e192] | 342 | continue;
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| 343 | }
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| 344 |
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| 345 | int32_t mask = 1 << i;
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| 346 |
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| 347 | for (int32_t k = 0; k < SCR_H; ++k) {
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| 348 | if ((mem[atba + k] & mask) == 0) {
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[f285858] | 349 | flips[n_flips] = k;
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| 350 | ++n_flips;
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[ac4e192] | 351 | }
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| 352 | }
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| 353 |
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[f285858] | 354 | if (n_flips == 0) {
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| 355 | ver3("vid obj %d unused", i);
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[ac4e192] | 356 | continue;
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| 357 | }
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| 358 |
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[f285858] | 359 | if (n_flips == 1) {
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| 360 | flips[n_flips] = SCR_H;
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| 361 | ++n_flips;
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| 362 | }
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| 363 |
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| 364 | bool cb = (od[0] & OD0_CB) != 0;
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| 365 | bool tde = (od[0] & OD0_TDE) != 0;
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| 366 |
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| 367 | int32_t x = (od[1] & 0x03ff) * 2;
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[4f967e8] | 368 | int32_t off, fon_h, w;
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[f285858] | 369 |
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[b6f5f64] | 370 | if (cb) {
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[4f967e8] | 371 | off = od[2];
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[b6f5f64] | 372 | int32_t vcr1 = mem[REG_VCR1];
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[4f967e8] | 373 | fon_h = (vcr1 & 0xf000) >> 12;
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| 374 | w = w64 * 4 / 3 * 2 * 8;
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[f285858] | 375 | }
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| 376 | else {
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[4f967e8] | 377 | off = ((od[0] & 0x00c0) << 10) | od[2];
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| 378 | fon_h = -1;
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| 379 | w = w64 * 16;
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[f285858] | 380 | }
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[b6f5f64] | 381 |
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[4f967e8] | 382 | obj_t *obj = objs + n_objs;
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| 383 |
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[b6f5f64] | 384 | obj->x = x;
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| 385 | obj->y = flips[0];
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| 386 | obj->w = w;
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| 387 | obj->h = flips[1] - flips[0];
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| 388 | obj->mem = mem + off;
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| 389 | obj->tran = tde;
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[4f967e8] | 390 | obj->fon_h = fon_h;
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[b6f5f64] | 391 |
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| 392 | ver2("vid obj %d %c %c %d:%d %d+%d 0x%05x",
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| 393 | i, cb ? 'c' : 'b', tde ? 't' : '-', flips[0], flips[1], x, w, off);
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| 394 |
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| 395 | ++n_objs;
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[ac4e192] | 396 | }
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| 397 |
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[f285858] | 398 | SDL_AtomicAdd(&frame, 1);
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[3c30832] | 399 | return false;
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[a06aa8b] | 400 | }
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| 401 |
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| 402 | uint32_t vid_read(uint32_t off, int32_t sz)
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| 403 | {
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[ac4e192] | 404 | ver2("vid rd %d 0x%05x:%d", bank, off, sz * 8);
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| 405 |
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| 406 | int32_t off16 = (int32_t)(off / 2);
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| 407 |
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| 408 | if (sz != 2 || bank >= N_BANKS || off % 2 != 0 || off16 >= WIN_SZ_W) {
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| 409 | fail("invalid vid rd %d %u:%d", bank, off, sz * 8);
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| 410 | }
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| 411 |
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| 412 | if (off16 >= reg_off && off16 < reg_off + 16) {
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[a9861f3] | 413 | return mem[off16 - reg_off];
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[f285858] | 414 | }
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| 415 |
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[a9861f3] | 416 | return mem[bank * WIN_SZ_W + off16];
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[a06aa8b] | 417 | }
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| 418 |
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| 419 | void vid_write(uint32_t off, int32_t sz, uint32_t val)
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| 420 | {
|
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[ac4e192] | 421 | ver2("vid wr %d 0x%05x:%d 0x%0*x", bank, off, sz * 8, sz * 2, val);
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| 422 |
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| 423 | int32_t off16 = (int32_t)(off / 2);
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| 424 |
|
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| 425 | if (sz != 2 || bank >= N_BANKS || off % 2 != 0 || (off16 >= WIN_SZ_W && off16 != PAL_OFF)) {
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| 426 | fail("invalid vid wr %d %u:%d", bank, off, sz * 8);
|
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| 427 | }
|
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| 428 |
|
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[f285858] | 429 | if (off16 == PAL_OFF) {
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| 430 | int32_t i_pal = ((int32_t)val & 0x03c0) >> 6;
|
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| 431 |
|
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| 432 | uint32_t r = ((val & 0x0004) >> 1) | ((val & 0x0020) >> 5);
|
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| 433 | uint32_t g = ((val & 0x0002) >> 0) | ((val & 0x0010) >> 4);
|
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| 434 | uint32_t b = ((val & 0x0001) << 1) | ((val & 0x0008) >> 3);
|
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| 435 |
|
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| 436 | r = (r ^ 3) * 85;
|
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| 437 | g = (g ^ 3) * 85;
|
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| 438 | b = (b ^ 3) * 85;
|
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| 439 |
|
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| 440 | pal[i_pal] = (r << 24) | (g << 16) | (b << 8) | 0xff;
|
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[a9861f3] | 441 | return;
|
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[f285858] | 442 | }
|
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[a9861f3] | 443 |
|
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| 444 | if (off16 >= reg_off && off16 < reg_off + 16) {
|
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[ac4e192] | 445 | mem[off16 - reg_off] = (uint16_t)val;
|
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[a9861f3] | 446 | return;
|
---|
[ac4e192] | 447 | }
|
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| 448 |
|
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[a9861f3] | 449 | mem[bank * WIN_SZ_W + off16] = (uint16_t)val;
|
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[a06aa8b] | 450 | }
|
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