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annotate vdp.h @ 33:2e15fa26fe58

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Add support for simple resolution scaling
author Mike Pavone <pavone@retrodev.com>
date Sat, 08 Dec 2012 22:07:25 -0800
parents 72ce60cb1711
children 0e7df84158b1
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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_SPRITES_LINE 20
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16
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17 enum {
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18 REG_MODE_1=0,
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19 REG_MODE_2,
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20 REG_SCROLL_A,
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21 REG_WINDOW,
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22 REG_SCROLL_B,
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23 REG_SAT,
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24 REG_BG_COLOR,
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25 REG_HINT=0xA,
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26 REG_MODE_3,
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27 REG_MODE_4,
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28 REG_HSCROLL,
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29 REG_AUTOINC=0xF,
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30 REG_SCROLL,
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31 REG_WINDOW_H,
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32 REG_WINDOW_V
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33 } vdp_regs;
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34
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35 typedef struct {
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36 uint16_t address;
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37 int16_t x_pos;
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38 uint8_t pal_priority;
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39 uint8_t h_flip;
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40 } sprite_draw;
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41
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42 typedef struct {
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43 uint8_t size;
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44 uint8_t index;
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45 int16_t y;
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46 } sprite_info;
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47
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48 typedef struct {
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49 //cycle count in MCLKs
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50 uint32_t cycles;
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51 uint8_t *vdpmem;
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52 //stores 2-bit palette + 4-bit palette index + priority for current sprite line
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53 uint8_t *linebuf;
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54 //stores 12-bit color + shadow/highlight bits
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55 uint16_t *framebuf;
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56 uint16_t cram[CRAM_SIZE];
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57 uint16_t vsram[VSRAM_SIZE];
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58 uint8_t latched_mode;
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59 uint16_t hscroll_a;
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60 uint16_t hscroll_b;
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61 uint8_t sprite_index;
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62 uint8_t sprite_draws;
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63 int8_t slot_counter;
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64 int8_t cur_slot;
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65 uint8_t regs[VDP_REGS];
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66 sprite_draw sprite_draw_list[MAX_DRAWS];
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67 sprite_info sprite_info_list[MAX_SPRITES_LINE];
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68 uint16_t col_1;
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69 uint16_t col_2;
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70 uint8_t v_offset;
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71 uint8_t *tmp_buf_a;
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72 uint8_t *tmp_buf_b;
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73 } vdp_context;
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74
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75 void init_vdp_context(vdp_context * context);
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76 void vdp_run_context(vdp_context * context, uint32_t target_cycles);
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77 //runs from current cycle count to VBLANK for the current mode, returns ending cycle count
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78 uint32_t vdp_run_to_vblank(vdp_context * context);
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79 void vdp_load_savestate(vdp_context * context, FILE * state_file);
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80
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81 #endif //VDP_H_