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/* |
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* VIC.h - 6569R5 emulation (line based) |
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* |
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* Frodo (C) 1994-1997,2002-2003 Christian Bauer |
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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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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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|
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#ifndef _VIC_H |
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#define _VIC_H |
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|
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|
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// Define this if you want global variables instead of member variables |
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#if defined(__i386) || defined(mc68000) || defined(__MC68K__) |
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#define GLOBAL_VARS |
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#endif |
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|
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// Define this if you have a processor that can do unaligned accesses quickly |
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#if defined(__i386) || defined(mc68000) || defined(__MC68K__) |
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#define CAN_ACCESS_UNALIGNED |
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#endif |
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|
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|
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// Total number of raster lines (PAL) |
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const unsigned TOTAL_RASTERS = 0x138; |
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|
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// Screen refresh frequency (PAL) |
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const unsigned SCREEN_FREQ = 50; |
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|
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|
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class MOS6510; |
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class C64Display; |
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class C64; |
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struct MOS6569State; |
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|
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|
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class MOS6569 { |
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public: |
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MOS6569(C64 *c64, C64Display *disp, MOS6510 *CPU, uint8 *RAM, uint8 *Char, uint8 *Color); |
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|
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uint8 ReadRegister(uint16 adr); |
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void WriteRegister(uint16 adr, uint8 byte); |
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#ifdef FRODO_SC |
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bool EmulateCycle(void); |
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#else |
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int EmulateLine(void); |
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#endif |
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void ChangedVA(uint16 new_va); // CIA VA14/15 has changed |
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void TriggerLightpen(void); // Trigger lightpen interrupt |
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void ReInitColors(void); |
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void GetState(MOS6569State *vd); |
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void SetState(MOS6569State *vd); |
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|
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#ifdef FRODO_SC |
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uint8 LastVICByte; |
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#endif |
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|
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private: |
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#ifndef GLOBAL_VARS |
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void vblank(void); |
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void raster_irq(void); |
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|
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uint16 mx[8]; // VIC registers |
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uint8 my[8]; |
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uint8 mx8; |
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uint8 ctrl1, ctrl2; |
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uint8 lpx, lpy; |
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uint8 me, mxe, mye, mdp, mmc; |
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uint8 vbase; |
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uint8 irq_flag, irq_mask; |
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uint8 clx_spr, clx_bgr; |
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uint8 ec, b0c, b1c, b2c, b3c, mm0, mm1; |
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uint8 sc[8]; |
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|
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uint8 *ram, *char_rom, *color_ram; // Pointers to RAM and ROM |
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C64 *the_c64; // Pointer to C64 |
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C64Display *the_display; // Pointer to C64Display |
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MOS6510 *the_cpu; // Pointer to 6510 |
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|
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uint8 colors[256]; // Indices of the 16 C64 colors (16 times mirrored to avoid "& 0x0f") |
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|
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uint8 ec_color, b0c_color, b1c_color, |
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b2c_color, b3c_color; // Indices for exterior/background colors |
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uint8 mm0_color, mm1_color; // Indices for MOB multicolors |
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uint8 spr_color[8]; // Indices for MOB colors |
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|
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uint32 ec_color_long; // ec_color expanded to 32 bits |
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|
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uint8 matrix_line[40]; // Buffer for video line, read in Bad Lines |
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uint8 color_line[40]; // Buffer for color line, read in Bad Lines |
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|
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#ifdef __POWERPC__ |
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double chunky_tmp[0x180/8]; // Temporary line buffer for speedup |
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#endif |
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uint8 *chunky_line_start; // Pointer to start of current line in bitmap buffer |
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int xmod; // Number of bytes per row |
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|
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uint16 raster_y; // Current raster line |
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uint16 irq_raster; // Interrupt raster line |
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uint16 dy_start; // Comparison values for border logic |
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uint16 dy_stop; |
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uint16 rc; // Row counter |
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uint16 vc; // Video counter |
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uint16 vc_base; // Video counter base |
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uint16 x_scroll; // X scroll value |
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uint16 y_scroll; // Y scroll value |
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uint16 cia_vabase; // CIA VA14/15 video base |
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|
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uint16 mc[8]; // Sprite data counters |
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|
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int display_idx; // Index of current display mode |
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int skip_counter; // Counter for frame-skipping |
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|
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long pad0; // Keep buffers long-aligned |
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uint8 spr_coll_buf[0x180]; // Buffer for sprite-sprite collisions and priorities |
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uint8 fore_mask_buf[0x180/8]; // Foreground mask for sprite-graphics collisions and priorities |
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#ifndef CAN_ACCESS_UNALIGNED |
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uint8 text_chunky_buf[40*8]; // Line graphics buffer |
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#endif |
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|
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bool display_state; // true: Display state, false: Idle state |
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bool border_on; // Flag: Upper/lower border on (Frodo SC: Main border flipflop) |
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bool frame_skipped; // Flag: Frame is being skipped |
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uint8 bad_lines_enabled; // Flag: Bad Lines enabled for this frame |
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bool lp_triggered; // Flag: Lightpen was triggered in this frame |
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|
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#ifdef FRODO_SC |
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uint8 read_byte(uint16 adr); |
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void matrix_access(void); |
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void graphics_access(void); |
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void draw_graphics(void); |
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void draw_sprites(void); |
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void draw_background(void); |
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|
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int cycle; // Current cycle in line (1..63) |
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|
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uint8 *chunky_ptr; // Pointer in chunky bitmap buffer (this is where out output goes) |
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uint8 *fore_mask_ptr; // Pointer in fore_mask_buf |
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|
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uint16 matrix_base; // Video matrix base |
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uint16 char_base; // Character generator base |
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uint16 bitmap_base; // Bitmap base |
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|
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bool is_bad_line; // Flag: Current line is bad line |
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bool draw_this_line; // Flag: This line is drawn on the screen |
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bool ud_border_on; // Flag: Upper/lower border on |
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bool vblanking; // Flag: VBlank in next cycle |
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|
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bool border_on_sample[5]; // Samples of border state at different cycles (1, 17, 18, 56, 57) |
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uint8 border_color_sample[0x180/8]; // Samples of border color at each "displayed" cycle |
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|
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uint8 ref_cnt; // Refresh counter |
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uint8 spr_exp_y; // 8 sprite y expansion flipflops |
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uint8 spr_dma_on; // 8 flags: Sprite DMA active |
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uint8 spr_disp_on; // 8 flags: Sprite display active |
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uint8 spr_draw; // 8 flags: Draw sprite in this line |
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uint16 spr_ptr[8]; // Sprite data pointers |
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uint16 mc_base[8]; // Sprite data counter bases |
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|
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uint16 raster_x; // Current raster x position |
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|
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int ml_index; // Index in matrix/color_line[] |
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uint8 gfx_data, char_data, color_data, last_char_data; |
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uint8 spr_data[8][4]; // Sprite data read |
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uint8 spr_draw_data[8][4]; // Sprite data for drawing |
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|
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uint32 first_ba_cycle; // Cycle when BA first went low |
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#else |
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uint8 *get_physical(uint16 adr); |
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void make_mc_table(void); |
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void el_std_text(uint8 *p, uint8 *q, uint8 *r); |
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void el_mc_text(uint8 *p, uint8 *q, uint8 *r); |
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void el_std_bitmap(uint8 *p, uint8 *q, uint8 *r); |
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void el_mc_bitmap(uint8 *p, uint8 *q, uint8 *r); |
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void el_ecm_text(uint8 *p, uint8 *q, uint8 *r); |
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void el_std_idle(uint8 *p, uint8 *r); |
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void el_mc_idle(uint8 *p, uint8 *r); |
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void el_sprites(uint8 *chunky_ptr); |
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int el_update_mc(int raster); |
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|
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uint16 mc_color_lookup[4]; |
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|
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bool border_40_col; // Flag: 40 column border |
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uint8 sprite_on; // 8 flags: Sprite display/DMA active |
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|
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uint8 *matrix_base; // Video matrix base |
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uint8 *char_base; // Character generator base |
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uint8 *bitmap_base; // Bitmap base |
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#endif |
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#endif |
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}; |
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|
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|
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// VIC state |
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struct MOS6569State { |
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uint8 m0x; // Sprite coordinates |
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uint8 m0y; |
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uint8 m1x; |
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uint8 m1y; |
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uint8 m2x; |
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uint8 m2y; |
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uint8 m3x; |
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uint8 m3y; |
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uint8 m4x; |
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uint8 m4y; |
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uint8 m5x; |
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uint8 m5y; |
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uint8 m6x; |
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uint8 m6y; |
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uint8 m7x; |
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uint8 m7y; |
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uint8 mx8; |
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|
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uint8 ctrl1; // Control registers |
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uint8 raster; |
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uint8 lpx; |
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uint8 lpy; |
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uint8 me; |
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uint8 ctrl2; |
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uint8 mye; |
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uint8 vbase; |
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uint8 irq_flag; |
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uint8 irq_mask; |
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uint8 mdp; |
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uint8 mmc; |
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uint8 mxe; |
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uint8 mm; |
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uint8 md; |
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|
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uint8 ec; // Color registers |
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uint8 b0c; |
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uint8 b1c; |
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uint8 b2c; |
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uint8 b3c; |
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uint8 mm0; |
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uint8 mm1; |
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uint8 m0c; |
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uint8 m1c; |
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uint8 m2c; |
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uint8 m3c; |
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uint8 m4c; |
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uint8 m5c; |
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uint8 m6c; |
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uint8 m7c; |
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// Additional registers |
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uint8 pad0; |
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uint16 irq_raster; // IRQ raster line |
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uint16 vc; // Video counter |
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uint16 vc_base; // Video counter base |
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uint8 rc; // Row counter |
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uint8 spr_dma; // 8 Flags: Sprite DMA active |
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uint8 spr_disp; // 8 Flags: Sprite display active |
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uint8 mc[8]; // Sprite data counters |
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uint8 mc_base[8]; // Sprite data counter bases |
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bool display_state; // true: Display state, false: Idle state |
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bool bad_line; // Flag: Bad Line state |
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bool bad_line_enable; // Flag: Bad Lines enabled for this frame |
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bool lp_triggered; // Flag: Lightpen was triggered in this frame |
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bool border_on; // Flag: Upper/lower border on (Frodo SC: Main border flipflop) |
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|
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uint16 bank_base; // VIC bank base address |
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uint16 matrix_base; // Video matrix base |
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uint16 char_base; // Character generator base |
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uint16 bitmap_base; // Bitmap base |
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uint16 sprite_base[8]; // Sprite bases |
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|
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// Frodo SC: |
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int cycle; // Current cycle in line (1..63) |
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uint16 raster_x; // Current raster x position |
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int ml_index; // Index in matrix/color_line[] |
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uint8 ref_cnt; // Refresh counter |
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uint8 last_vic_byte; // Last byte read by VIC |
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bool ud_border_on; // Flag: Upper/lower border on |
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}; |
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|
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#endif |
