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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15 | * "gpl.txt" in the top directory of this repository.
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16 | */
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17 |
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18 | #include <all.h>
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19 |
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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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23 |
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24 | int32_t vid_verbose = 0;
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25 |
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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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36 | #define REG_ATBAC 11
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37 |
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38 | #define VCR0_UCF 0x0001
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39 | #define VCR0_DEN 0x0008
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40 |
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41 | #define DSBA_BS1 0x0080
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42 | #define DSBA_BS0 0x0100
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43 |
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44 | #define REG_OFF 0x200
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45 | #define PAL_OFF 0x40000
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46 |
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47 | #define OD0_BLA 0x0010
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48 |
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49 | #define WIN_SZ_W 0x10000
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50 | #define MEM_SZ_W 0x20000
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51 |
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52 | #define N_BANKS 2
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53 |
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54 | static int32_t reg_off = REG_OFF;
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55 |
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56 | static uint16_t mem[MEM_SZ_W];
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57 | static int32_t bank = 0;
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58 |
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59 | static int32_t pal[16];
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60 | static int32_t i_pal = 0;
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61 |
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62 | void vid_init(void)
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63 | {
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64 | ver("vid init");
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65 | }
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66 |
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67 | void vid_quit(void)
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68 | {
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69 | ver("vid quit");
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70 | }
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71 |
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72 | bool vid_exec(void)
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73 | {
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74 | ver3("vid exec");
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75 |
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76 | static int32_t skip = 99999;
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77 | static int32_t line = 99999;
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78 |
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79 | if (++skip < 10) {
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80 | ver3("vid skip %d", skip);
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81 | return false;
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82 | }
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83 |
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84 | skip = 0;
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85 | int32_t vcr0 = mem[REG_VCR0];
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86 |
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87 | if ((vcr0 & VCR0_DEN) == 0) {
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88 | ver3("vid dis");
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89 | return false;
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90 | }
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91 |
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92 | if (++line < SCR_H + VBL_H) {
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93 | ver3("vid line %d", line);
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94 |
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95 | if (line < SCR_H) {
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96 | ++mem[REG_ATBAC];
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97 | }
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98 |
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99 | return line == SCR_H;
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100 | }
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101 |
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102 | // We get here every 4,000 invocations -> 25 fps.
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103 |
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104 | ver2("vid frame");
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105 | line = 0;
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106 |
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107 | int32_t dsba = mem[REG_DSBA];
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108 | bank = ((dsba & DSBA_BS0) != 0 ? 1 : 0) + ((dsba & DSBA_BS1) != 0 ? 2 : 0);
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109 |
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110 | int32_t rwba = mem[REG_RWBA];
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111 | reg_off = (rwba & 0xfff0) << 1;
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112 |
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113 | int32_t atba = mem[REG_ATBA];
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114 | mem[REG_ATBAC] = (uint16_t)atba;
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115 |
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116 | int32_t odtba = mem[REG_ODTBA] & 0xffc0;
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117 | int32_t y_beg[16], y_end[16];
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118 |
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119 | for (int32_t i = 0; i < 16; ++i) {
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120 | y_beg[i] = -1;
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121 | y_end[i] = -1;
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122 |
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123 | uint16_t *od = mem + odtba + 4 * i;
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124 |
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125 | if ((od[0] & OD0_BLA) != 0) {
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126 | ver3("obj %d blanked", i);
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127 | continue;
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128 | }
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129 |
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130 | int32_t w = (od[1] & 0xfc00) >> 6;
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131 |
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132 | if (w == 0) {
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133 | ver3("obj %d empty", i);
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134 | continue;
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135 | }
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136 |
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137 | int32_t mask = 1 << i;
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138 |
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139 | for (int32_t k = 0; k < SCR_H; ++k) {
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140 | if ((mem[atba + k] & mask) == 0) {
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141 | if (y_beg[i] < 0) {
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142 | y_beg[i] = k;
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143 | }
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144 | else if (y_end[i] < 0) {
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145 | y_end[i] = k;
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146 | }
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147 | }
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148 | }
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149 |
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150 | if (y_beg[i] < 0) {
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151 | ver3("obj %d unused", i);
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152 | continue;
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153 | }
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154 |
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155 | int32_t x = od[1] & 0x03ff;
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156 | ver2("obj %d %d:%d %d+%d", i, y_beg[i], y_end[i], x, w);
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157 | }
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158 |
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159 | int32_t vcr1 = mem[REG_VCR1];
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160 | int32_t fon_h = (vcr1 & 0xf000) >> 12;
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161 |
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162 | return false;
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163 | }
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164 |
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165 | uint32_t vid_read(uint32_t off, int32_t sz)
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166 | {
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167 | ver2("vid rd %d 0x%05x:%d", bank, off, sz * 8);
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168 |
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169 | int32_t off16 = (int32_t)(off / 2);
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170 |
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171 | if (sz != 2 || bank >= N_BANKS || off % 2 != 0 || off16 >= WIN_SZ_W) {
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172 | fail("invalid vid rd %d %u:%d", bank, off, sz * 8);
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173 | }
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174 |
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175 | if (off16 >= reg_off && off16 < reg_off + 16) {
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176 | return mem[off16 - reg_off];
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177 | }
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178 |
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179 | return mem[bank * WIN_SZ_W + off16];
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180 | }
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181 |
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182 | void vid_write(uint32_t off, int32_t sz, uint32_t val)
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183 | {
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184 | ver2("vid wr %d 0x%05x:%d 0x%0*x", bank, off, sz * 8, sz * 2, val);
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185 |
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186 | int32_t off16 = (int32_t)(off / 2);
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187 |
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188 | if (sz != 2 || bank >= N_BANKS || off % 2 != 0 || (off16 >= WIN_SZ_W && off16 != PAL_OFF)) {
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189 | fail("invalid vid wr %d %u:%d", bank, off, sz * 8);
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190 | }
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191 |
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192 | if (off16 == PAL_OFF) {
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193 | pal[i_pal] = (int32_t)val;
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194 | i_pal = (i_pal + 1) % 16;
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195 | return;
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196 | }
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197 |
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198 | if (off16 >= reg_off && off16 < reg_off + 16) {
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199 | mem[off16 - reg_off] = (uint16_t)val;
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200 | return;
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201 | }
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202 |
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203 | mem[bank * WIN_SZ_W + off16] = (uint16_t)val;
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204 | }
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