284 lines
8.3 KiB
C++
284 lines
8.3 KiB
C++
/*
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* VIC.h - 6569R5 emulation (line based)
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*
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* Frodo (C) 1994-1997,2002-2005 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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#ifndef _VIC_H
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#define _VIC_H
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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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// Total number of raster lines (PAL)
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const unsigned TOTAL_RASTERS = 0x138;
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// Screen refresh frequency (PAL)
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const unsigned SCREEN_FREQ = 50;
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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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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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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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#ifdef FRODO_SC
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uint8 LastVICByte;
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#endif
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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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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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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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uint8 colors[256]; // Indices of the 16 C64 colors (16 times mirrored to avoid "& 0x0f")
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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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uint32 ec_color_long; // ec_color expanded to 32 bits
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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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#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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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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uint16 mc[8]; // Sprite data counters
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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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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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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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#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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int cycle; // Current cycle in line (1..63)
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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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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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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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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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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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uint16 raster_x; // Current raster x position
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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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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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uint16 mc_color_lookup[4];
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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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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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// 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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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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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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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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// 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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#endif
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