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annotate vdp.h @ 37:cd59519b26d9

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Initial H32 mode support
author Mike Pavone <pavone@retrodev.com>
date Sat, 08 Dec 2012 23:49:51 -0800
parents 0e7df84158b1
children 898e3d035f42
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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
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19 enum {
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20 REG_MODE_1=0,
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21 REG_MODE_2,
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22 REG_SCROLL_A,
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23 REG_WINDOW,
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24 REG_SCROLL_B,
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25 REG_SAT,
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26 REG_BG_COLOR,
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27 REG_HINT=0xA,
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28 REG_MODE_3,
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29 REG_MODE_4,
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30 REG_HSCROLL,
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31 REG_AUTOINC=0xF,
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32 REG_SCROLL,
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33 REG_WINDOW_H,
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34 REG_WINDOW_V
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35 } vdp_regs;
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36
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37 typedef struct {
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38 uint16_t address;
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39 int16_t x_pos;
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40 uint8_t pal_priority;
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41 uint8_t h_flip;
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42 } sprite_draw;
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44 typedef struct {
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45 uint8_t size;
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46 uint8_t index;
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47 int16_t y;
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48 } sprite_info;
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50 typedef struct {
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51 //cycle count in MCLKs
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52 uint32_t cycles;
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53 uint8_t *vdpmem;
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54 //stores 2-bit palette + 4-bit palette index + priority for current sprite line
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55 uint8_t *linebuf;
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56 //stores 12-bit color + shadow/highlight bits
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57 uint16_t *framebuf;
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58 uint16_t cram[CRAM_SIZE];
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59 uint16_t vsram[VSRAM_SIZE];
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60 uint8_t latched_mode;
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61 uint16_t hscroll_a;
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62 uint16_t hscroll_b;
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63 uint8_t sprite_index;
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64 uint8_t sprite_draws;
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65 int8_t slot_counter;
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66 int8_t cur_slot;
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67 uint8_t regs[VDP_REGS];
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68 sprite_draw sprite_draw_list[MAX_DRAWS];
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69 sprite_info sprite_info_list[MAX_SPRITES_LINE];
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70 uint16_t col_1;
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71 uint16_t col_2;
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72 uint8_t v_offset;
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73 uint8_t flags;
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74 uint8_t *tmp_buf_a;
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75 uint8_t *tmp_buf_b;
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76 } vdp_context;
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78 void init_vdp_context(vdp_context * context);
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79 void vdp_run_context(vdp_context * context, uint32_t target_cycles);
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80 //runs from current cycle count to VBLANK for the current mode, returns ending cycle count
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81 uint32_t vdp_run_to_vblank(vdp_context * context);
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82 void vdp_load_savestate(vdp_context * context, FILE * state_file);
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83
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84 #endif //VDP_H_