| 1 |
cebix |
1.1 |
/* |
| 2 |
|
|
* VIC.h - 6569R5 emulation (line based) |
| 3 |
|
|
* |
| 4 |
cebix |
1.2 |
* Frodo (C) 1994-1997,2002-2003 Christian Bauer |
| 5 |
cebix |
1.1 |
* |
| 6 |
|
|
* This program is free software; you can redistribute it and/or modify |
| 7 |
|
|
* it under the terms of the GNU General Public License as published by |
| 8 |
|
|
* the Free Software Foundation; either version 2 of the License, or |
| 9 |
|
|
* (at your option) any later version. |
| 10 |
|
|
* |
| 11 |
|
|
* This program is distributed in the hope that it will be useful, |
| 12 |
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 |
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 |
|
|
* GNU General Public License for more details. |
| 15 |
|
|
* |
| 16 |
|
|
* You should have received a copy of the GNU General Public License |
| 17 |
|
|
* along with this program; if not, write to the Free Software |
| 18 |
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 |
|
|
*/ |
| 20 |
|
|
|
| 21 |
|
|
#ifndef _VIC_H |
| 22 |
|
|
#define _VIC_H |
| 23 |
|
|
|
| 24 |
|
|
|
| 25 |
|
|
// Define this if you want global variables instead of member variables |
| 26 |
|
|
#if defined(__i386) || defined(mc68000) || defined(__MC68K__) |
| 27 |
|
|
#define GLOBAL_VARS |
| 28 |
|
|
#endif |
| 29 |
|
|
|
| 30 |
|
|
// Define this if you have a processor that can do unaligned accesses quickly |
| 31 |
|
|
#if defined(__i386) || defined(mc68000) || defined(__MC68K__) |
| 32 |
|
|
#define CAN_ACCESS_UNALIGNED |
| 33 |
|
|
#endif |
| 34 |
|
|
|
| 35 |
|
|
|
| 36 |
|
|
// Total number of raster lines (PAL) |
| 37 |
|
|
const unsigned TOTAL_RASTERS = 0x138; |
| 38 |
|
|
|
| 39 |
|
|
// Screen refresh frequency (PAL) |
| 40 |
|
|
const unsigned SCREEN_FREQ = 50; |
| 41 |
|
|
|
| 42 |
|
|
|
| 43 |
|
|
class MOS6510; |
| 44 |
|
|
class C64Display; |
| 45 |
|
|
class C64; |
| 46 |
|
|
struct MOS6569State; |
| 47 |
|
|
|
| 48 |
|
|
|
| 49 |
|
|
class MOS6569 { |
| 50 |
|
|
public: |
| 51 |
|
|
MOS6569(C64 *c64, C64Display *disp, MOS6510 *CPU, uint8 *RAM, uint8 *Char, uint8 *Color); |
| 52 |
|
|
|
| 53 |
|
|
uint8 ReadRegister(uint16 adr); |
| 54 |
|
|
void WriteRegister(uint16 adr, uint8 byte); |
| 55 |
|
|
#ifdef FRODO_SC |
| 56 |
|
|
bool EmulateCycle(void); |
| 57 |
|
|
#else |
| 58 |
|
|
int EmulateLine(void); |
| 59 |
|
|
#endif |
| 60 |
|
|
void ChangedVA(uint16 new_va); // CIA VA14/15 has changed |
| 61 |
|
|
void TriggerLightpen(void); // Trigger lightpen interrupt |
| 62 |
|
|
void ReInitColors(void); |
| 63 |
|
|
void GetState(MOS6569State *vd); |
| 64 |
|
|
void SetState(MOS6569State *vd); |
| 65 |
|
|
|
| 66 |
|
|
#ifdef FRODO_SC |
| 67 |
|
|
uint8 LastVICByte; |
| 68 |
|
|
#endif |
| 69 |
|
|
|
| 70 |
|
|
private: |
| 71 |
|
|
#ifndef GLOBAL_VARS |
| 72 |
|
|
void vblank(void); |
| 73 |
|
|
void raster_irq(void); |
| 74 |
|
|
|
| 75 |
|
|
uint16 mx[8]; // VIC registers |
| 76 |
|
|
uint8 my[8]; |
| 77 |
|
|
uint8 mx8; |
| 78 |
|
|
uint8 ctrl1, ctrl2; |
| 79 |
|
|
uint8 lpx, lpy; |
| 80 |
|
|
uint8 me, mxe, mye, mdp, mmc; |
| 81 |
|
|
uint8 vbase; |
| 82 |
|
|
uint8 irq_flag, irq_mask; |
| 83 |
|
|
uint8 clx_spr, clx_bgr; |
| 84 |
|
|
uint8 ec, b0c, b1c, b2c, b3c, mm0, mm1; |
| 85 |
|
|
uint8 sc[8]; |
| 86 |
|
|
|
| 87 |
|
|
uint8 *ram, *char_rom, *color_ram; // Pointers to RAM and ROM |
| 88 |
|
|
C64 *the_c64; // Pointer to C64 |
| 89 |
|
|
C64Display *the_display; // Pointer to C64Display |
| 90 |
|
|
MOS6510 *the_cpu; // Pointer to 6510 |
| 91 |
|
|
|
| 92 |
|
|
uint8 colors[256]; // Indices of the 16 C64 colors (16 times mirrored to avoid "& 0x0f") |
| 93 |
|
|
|
| 94 |
|
|
uint8 ec_color, b0c_color, b1c_color, |
| 95 |
|
|
b2c_color, b3c_color; // Indices for exterior/background colors |
| 96 |
|
|
uint8 mm0_color, mm1_color; // Indices for MOB multicolors |
| 97 |
|
|
uint8 spr_color[8]; // Indices for MOB colors |
| 98 |
|
|
|
| 99 |
|
|
uint32 ec_color_long; // ec_color expanded to 32 bits |
| 100 |
|
|
|
| 101 |
|
|
uint8 matrix_line[40]; // Buffer for video line, read in Bad Lines |
| 102 |
|
|
uint8 color_line[40]; // Buffer for color line, read in Bad Lines |
| 103 |
|
|
|
| 104 |
|
|
#ifdef __POWERPC__ |
| 105 |
|
|
double chunky_tmp[0x180/8]; // Temporary line buffer for speedup |
| 106 |
|
|
#endif |
| 107 |
|
|
uint8 *chunky_line_start; // Pointer to start of current line in bitmap buffer |
| 108 |
|
|
int xmod; // Number of bytes per row |
| 109 |
|
|
|
| 110 |
|
|
uint16 raster_y; // Current raster line |
| 111 |
|
|
uint16 irq_raster; // Interrupt raster line |
| 112 |
|
|
uint16 dy_start; // Comparison values for border logic |
| 113 |
|
|
uint16 dy_stop; |
| 114 |
|
|
uint16 rc; // Row counter |
| 115 |
|
|
uint16 vc; // Video counter |
| 116 |
|
|
uint16 vc_base; // Video counter base |
| 117 |
|
|
uint16 x_scroll; // X scroll value |
| 118 |
|
|
uint16 y_scroll; // Y scroll value |
| 119 |
|
|
uint16 cia_vabase; // CIA VA14/15 video base |
| 120 |
|
|
|
| 121 |
|
|
uint16 mc[8]; // Sprite data counters |
| 122 |
|
|
|
| 123 |
|
|
int display_idx; // Index of current display mode |
| 124 |
|
|
int skip_counter; // Counter for frame-skipping |
| 125 |
|
|
|
| 126 |
|
|
long pad0; // Keep buffers long-aligned |
| 127 |
|
|
uint8 spr_coll_buf[0x180]; // Buffer for sprite-sprite collisions and priorities |
| 128 |
|
|
uint8 fore_mask_buf[0x180/8]; // Foreground mask for sprite-graphics collisions and priorities |
| 129 |
|
|
#ifndef CAN_ACCESS_UNALIGNED |
| 130 |
|
|
uint8 text_chunky_buf[40*8]; // Line graphics buffer |
| 131 |
|
|
#endif |
| 132 |
|
|
|
| 133 |
|
|
bool display_state; // true: Display state, false: Idle state |
| 134 |
|
|
bool border_on; // Flag: Upper/lower border on (Frodo SC: Main border flipflop) |
| 135 |
|
|
bool frame_skipped; // Flag: Frame is being skipped |
| 136 |
|
|
uint8 bad_lines_enabled; // Flag: Bad Lines enabled for this frame |
| 137 |
|
|
bool lp_triggered; // Flag: Lightpen was triggered in this frame |
| 138 |
|
|
|
| 139 |
|
|
#ifdef FRODO_SC |
| 140 |
|
|
uint8 read_byte(uint16 adr); |
| 141 |
|
|
void matrix_access(void); |
| 142 |
|
|
void graphics_access(void); |
| 143 |
|
|
void draw_graphics(void); |
| 144 |
|
|
void draw_sprites(void); |
| 145 |
|
|
void draw_background(void); |
| 146 |
|
|
|
| 147 |
|
|
int cycle; // Current cycle in line (1..63) |
| 148 |
|
|
|
| 149 |
|
|
uint8 *chunky_ptr; // Pointer in chunky bitmap buffer (this is where out output goes) |
| 150 |
|
|
uint8 *fore_mask_ptr; // Pointer in fore_mask_buf |
| 151 |
|
|
|
| 152 |
|
|
uint16 matrix_base; // Video matrix base |
| 153 |
|
|
uint16 char_base; // Character generator base |
| 154 |
|
|
uint16 bitmap_base; // Bitmap base |
| 155 |
|
|
|
| 156 |
|
|
bool is_bad_line; // Flag: Current line is bad line |
| 157 |
|
|
bool draw_this_line; // Flag: This line is drawn on the screen |
| 158 |
|
|
bool ud_border_on; // Flag: Upper/lower border on |
| 159 |
|
|
bool vblanking; // Flag: VBlank in next cycle |
| 160 |
|
|
|
| 161 |
|
|
bool border_on_sample[5]; // Samples of border state at different cycles (1, 17, 18, 56, 57) |
| 162 |
|
|
uint8 border_color_sample[0x180/8]; // Samples of border color at each "displayed" cycle |
| 163 |
|
|
|
| 164 |
|
|
uint8 ref_cnt; // Refresh counter |
| 165 |
|
|
uint8 spr_exp_y; // 8 sprite y expansion flipflops |
| 166 |
|
|
uint8 spr_dma_on; // 8 flags: Sprite DMA active |
| 167 |
|
|
uint8 spr_disp_on; // 8 flags: Sprite display active |
| 168 |
|
|
uint8 spr_draw; // 8 flags: Draw sprite in this line |
| 169 |
|
|
uint16 spr_ptr[8]; // Sprite data pointers |
| 170 |
|
|
uint16 mc_base[8]; // Sprite data counter bases |
| 171 |
|
|
|
| 172 |
|
|
uint16 raster_x; // Current raster x position |
| 173 |
|
|
|
| 174 |
|
|
int ml_index; // Index in matrix/color_line[] |
| 175 |
|
|
uint8 gfx_data, char_data, color_data, last_char_data; |
| 176 |
|
|
uint8 spr_data[8][4]; // Sprite data read |
| 177 |
|
|
uint8 spr_draw_data[8][4]; // Sprite data for drawing |
| 178 |
|
|
|
| 179 |
|
|
uint32 first_ba_cycle; // Cycle when BA first went low |
| 180 |
|
|
#else |
| 181 |
|
|
uint8 *get_physical(uint16 adr); |
| 182 |
|
|
void make_mc_table(void); |
| 183 |
|
|
void el_std_text(uint8 *p, uint8 *q, uint8 *r); |
| 184 |
|
|
void el_mc_text(uint8 *p, uint8 *q, uint8 *r); |
| 185 |
|
|
void el_std_bitmap(uint8 *p, uint8 *q, uint8 *r); |
| 186 |
|
|
void el_mc_bitmap(uint8 *p, uint8 *q, uint8 *r); |
| 187 |
|
|
void el_ecm_text(uint8 *p, uint8 *q, uint8 *r); |
| 188 |
|
|
void el_std_idle(uint8 *p, uint8 *r); |
| 189 |
|
|
void el_mc_idle(uint8 *p, uint8 *r); |
| 190 |
|
|
void el_sprites(uint8 *chunky_ptr); |
| 191 |
|
|
int el_update_mc(int raster); |
| 192 |
|
|
|
| 193 |
|
|
uint16 mc_color_lookup[4]; |
| 194 |
|
|
|
| 195 |
|
|
bool border_40_col; // Flag: 40 column border |
| 196 |
|
|
uint8 sprite_on; // 8 flags: Sprite display/DMA active |
| 197 |
|
|
|
| 198 |
|
|
uint8 *matrix_base; // Video matrix base |
| 199 |
|
|
uint8 *char_base; // Character generator base |
| 200 |
|
|
uint8 *bitmap_base; // Bitmap base |
| 201 |
|
|
#endif |
| 202 |
|
|
#endif |
| 203 |
|
|
}; |
| 204 |
|
|
|
| 205 |
|
|
|
| 206 |
|
|
// VIC state |
| 207 |
|
|
struct MOS6569State { |
| 208 |
|
|
uint8 m0x; // Sprite coordinates |
| 209 |
|
|
uint8 m0y; |
| 210 |
|
|
uint8 m1x; |
| 211 |
|
|
uint8 m1y; |
| 212 |
|
|
uint8 m2x; |
| 213 |
|
|
uint8 m2y; |
| 214 |
|
|
uint8 m3x; |
| 215 |
|
|
uint8 m3y; |
| 216 |
|
|
uint8 m4x; |
| 217 |
|
|
uint8 m4y; |
| 218 |
|
|
uint8 m5x; |
| 219 |
|
|
uint8 m5y; |
| 220 |
|
|
uint8 m6x; |
| 221 |
|
|
uint8 m6y; |
| 222 |
|
|
uint8 m7x; |
| 223 |
|
|
uint8 m7y; |
| 224 |
|
|
uint8 mx8; |
| 225 |
|
|
|
| 226 |
|
|
uint8 ctrl1; // Control registers |
| 227 |
|
|
uint8 raster; |
| 228 |
|
|
uint8 lpx; |
| 229 |
|
|
uint8 lpy; |
| 230 |
|
|
uint8 me; |
| 231 |
|
|
uint8 ctrl2; |
| 232 |
|
|
uint8 mye; |
| 233 |
|
|
uint8 vbase; |
| 234 |
|
|
uint8 irq_flag; |
| 235 |
|
|
uint8 irq_mask; |
| 236 |
|
|
uint8 mdp; |
| 237 |
|
|
uint8 mmc; |
| 238 |
|
|
uint8 mxe; |
| 239 |
|
|
uint8 mm; |
| 240 |
|
|
uint8 md; |
| 241 |
|
|
|
| 242 |
|
|
uint8 ec; // Color registers |
| 243 |
|
|
uint8 b0c; |
| 244 |
|
|
uint8 b1c; |
| 245 |
|
|
uint8 b2c; |
| 246 |
|
|
uint8 b3c; |
| 247 |
|
|
uint8 mm0; |
| 248 |
|
|
uint8 mm1; |
| 249 |
|
|
uint8 m0c; |
| 250 |
|
|
uint8 m1c; |
| 251 |
|
|
uint8 m2c; |
| 252 |
|
|
uint8 m3c; |
| 253 |
|
|
uint8 m4c; |
| 254 |
|
|
uint8 m5c; |
| 255 |
|
|
uint8 m6c; |
| 256 |
|
|
uint8 m7c; |
| 257 |
|
|
// Additional registers |
| 258 |
|
|
uint8 pad0; |
| 259 |
|
|
uint16 irq_raster; // IRQ raster line |
| 260 |
|
|
uint16 vc; // Video counter |
| 261 |
|
|
uint16 vc_base; // Video counter base |
| 262 |
|
|
uint8 rc; // Row counter |
| 263 |
|
|
uint8 spr_dma; // 8 Flags: Sprite DMA active |
| 264 |
|
|
uint8 spr_disp; // 8 Flags: Sprite display active |
| 265 |
|
|
uint8 mc[8]; // Sprite data counters |
| 266 |
|
|
uint8 mc_base[8]; // Sprite data counter bases |
| 267 |
|
|
bool display_state; // true: Display state, false: Idle state |
| 268 |
|
|
bool bad_line; // Flag: Bad Line state |
| 269 |
|
|
bool bad_line_enable; // Flag: Bad Lines enabled for this frame |
| 270 |
|
|
bool lp_triggered; // Flag: Lightpen was triggered in this frame |
| 271 |
|
|
bool border_on; // Flag: Upper/lower border on (Frodo SC: Main border flipflop) |
| 272 |
|
|
|
| 273 |
|
|
uint16 bank_base; // VIC bank base address |
| 274 |
|
|
uint16 matrix_base; // Video matrix base |
| 275 |
|
|
uint16 char_base; // Character generator base |
| 276 |
|
|
uint16 bitmap_base; // Bitmap base |
| 277 |
|
|
uint16 sprite_base[8]; // Sprite bases |
| 278 |
|
|
|
| 279 |
|
|
// Frodo SC: |
| 280 |
|
|
int cycle; // Current cycle in line (1..63) |
| 281 |
|
|
uint16 raster_x; // Current raster x position |
| 282 |
|
|
int ml_index; // Index in matrix/color_line[] |
| 283 |
|
|
uint8 ref_cnt; // Refresh counter |
| 284 |
|
|
uint8 last_vic_byte; // Last byte read by VIC |
| 285 |
|
|
bool ud_border_on; // Flag: Upper/lower border on |
| 286 |
|
|
}; |
| 287 |
|
|
|
| 288 |
|
|
#endif |
