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annotate vdp.h @ 72:7935cd64d5c8

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Implement word wide access to IO area
author Mike Pavone <pavone@retrodev.com>
date Fri, 21 Dec 2012 16:04:30 -0800
parents aef6302770c2
children 108e587165c0
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1 #ifndef VDP_H_
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2 #define VDP_H_
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3
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4 #include <stdint.h>
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5 #include <stdio.h>
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6
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7 #define VDP_REGS 24
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8 #define CRAM_SIZE 64
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9 #define VSRAM_SIZE 40
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10 #define VRAM_SIZE (64*1024)
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11 #define LINEBUF_SIZE 320
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12 #define FRAMEBUF_ENTRIES 320*224
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13 #define FRAMEBUF_SIZE (FRAMEBUF_ENTRIES*sizeof(uint16_t))
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14 #define MAX_DRAWS 40
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15 #define MAX_DRAWS_H32 32
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16 #define MAX_SPRITES_LINE 20
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17 #define MAX_SPRITES_LINE_H32 16
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18 #define MAX_SPRITES_FRAME 80
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19 #define MAX_SPRITES_FRAME_H32 64
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21 #define FBUF_BIT_PRIORITY 0x1000
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22 #define FBUF_SRC_MASK 0xE000
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23 #define FBUF_SRC_A 0x0000
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24 #define FBUF_SRC_W 0x2000
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25 #define FBUF_SRC_B 0x4000
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26 #define FBUF_SRC_S 0x6000
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27 #define FBUF_SRC_BG 0x8000
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29 #define MCLKS_LINE 3420
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30
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31 enum {
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32 REG_MODE_1=0,
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33 REG_MODE_2,
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34 REG_SCROLL_A,
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35 REG_WINDOW,
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36 REG_SCROLL_B,
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37 REG_SAT,
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38 REG_BG_COLOR,
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39 REG_HINT=0xA,
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40 REG_MODE_3,
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41 REG_MODE_4,
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42 REG_HSCROLL,
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43 REG_AUTOINC=0xF,
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44 REG_SCROLL,
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45 REG_WINDOW_H,
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46 REG_WINDOW_V
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47 } vdp_regs;
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48
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49 typedef struct {
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50 uint16_t address;
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51 int16_t x_pos;
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52 uint8_t pal_priority;
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53 uint8_t h_flip;
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54 } sprite_draw;
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56 typedef struct {
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57 uint8_t size;
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58 uint8_t index;
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59 int16_t y;
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60 } sprite_info;
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61
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62 typedef struct {
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63 uint32_t cycle;
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64 uint16_t value;
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65 uint8_t partial;
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66 } fifo_entry;
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67
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68 typedef struct {
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69 fifo_entry *fifo_cur;
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70 fifo_entry *fifo_end;
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71 uint16_t address;
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72 uint8_t cd;
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73 uint8_t flags;
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74 //cycle count in MCLKs
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75 uint32_t cycles;
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76 uint8_t *vdpmem;
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77 //stores 2-bit palette + 4-bit palette index + priority for current sprite line
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78 uint8_t *linebuf;
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79 //stores 12-bit color + shadow/highlight bits
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80 uint16_t *framebuf;
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81 uint16_t cram[CRAM_SIZE];
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82 uint16_t vsram[VSRAM_SIZE];
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83 uint8_t latched_mode;
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84 uint16_t hscroll_a;
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85 uint16_t hscroll_b;
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86 uint8_t sprite_index;
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87 uint8_t sprite_draws;
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88 int8_t slot_counter;
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89 int8_t cur_slot;
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90 uint8_t regs[VDP_REGS];
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91 sprite_draw sprite_draw_list[MAX_DRAWS];
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92 sprite_info sprite_info_list[MAX_SPRITES_LINE];
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93 uint16_t col_1;
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94 uint16_t col_2;
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95 uint8_t v_offset;
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96 uint8_t *tmp_buf_a;
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97 uint8_t *tmp_buf_b;
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98 } vdp_context;
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99
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100 void init_vdp_context(vdp_context * context);
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101 void vdp_run_context(vdp_context * context, uint32_t target_cycles);
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102 //runs from current cycle count to VBLANK for the current mode, returns ending cycle count
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103 uint32_t vdp_run_to_vblank(vdp_context * context);
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104 void vdp_load_savestate(vdp_context * context, FILE * state_file);
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105 void vdp_save_state(vdp_context * context, FILE * outfile);
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106 void vdp_control_port_write(vdp_context * context, uint16_t value);
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107 void vdp_data_port_write(vdp_context * context, uint16_t value);
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108 uint16_t vdp_control_port_read(vdp_context * context);
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109 uint16_t vdp_data_port_read(vdp_context * context);
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110 void vdp_adjust_cycles(vdp_context * context, uint32_t deduction);
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111
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112 #endif //VDP_H_