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Mostly broken VDP core and savestate viewer
author Mike Pavone <pavone@retrodev.com>
date Sat, 08 Dec 2012 02:00:54 -0800
parents
children 72ce60cb1711
comparison
equal deleted inserted replaced
19:4717146a7606 20:f664eeb55cb4
1 #ifndef VDP_H_
2 #define VDP_H_
3
4 #include <stdint.h>
5 #include <stdio.h>
6
7 #define VDP_REGS 24
8 #define CRAM_SIZE 64
9 #define VSRAM_SIZE 40
10 #define VRAM_SIZE (64*1024)
11 #define LINEBUF_SIZE 320
12 #define FRAMEBUF_ENTRIES 320*224
13 #define FRAMEBUF_SIZE (FRAMEBUF_ENTRIES*sizeof(uint16_t))
14 #define MAX_DRAWS 40
15 #define MAX_SPRITES_LINE 20
16
17 enum {
18 REG_MODE_1=0,
19 REG_MODE_2,
20 REG_SCROLL_A,
21 REG_WINDOW,
22 REG_SCROLL_B,
23 REG_SAT,
24 REG_BG_COLOR,
25 REG_HINT=0xA,
26 REG_MODE_3,
27 REG_MODE_4,
28 REG_HSCROLL,
29 REG_AUTOINC=0xF,
30 REG_SCROLL,
31 REG_WINDOW_H,
32 REG_WINDOW_V
33 } vdp_regs;
34
35 typedef struct {
36 uint16_t address;
37 int16_t x_pos;
38 uint8_t pal_priority;
39 uint8_t h_flip;
40 } sprite_draw;
41
42 typedef struct {
43 uint8_t size;
44 uint8_t index;
45 int16_t y;
46 } sprite_info;
47
48 typedef struct {
49 //cycle count in MCLKs
50 uint32_t cycles;
51 uint8_t *vdpmem;
52 //stores 2-bit palette + 4-bit palette index + priority for current sprite line
53 uint8_t *linebuf;
54 //stores 12-bit color + shadow/highlight bits
55 uint16_t *framebuf;
56 uint16_t cram[CRAM_SIZE];
57 uint16_t vsram[VSRAM_SIZE];
58 uint8_t latched_mode;
59 uint16_t hscroll_a;
60 uint16_t hscroll_b;
61 uint8_t sprite_index;
62 uint8_t sprite_draws;
63 uint8_t slot_counter;
64 uint8_t regs[VDP_REGS];
65 sprite_draw sprite_draw_list[MAX_DRAWS];
66 sprite_info sprite_info_list[MAX_SPRITES_LINE];
67 uint16_t col_1;
68 uint16_t col_2;
69 uint8_t v_offset;
70 uint8_t *tmp_buf_a;
71 uint8_t *tmp_buf_b;
72 } vdp_context;
73
74 void init_vdp_context(vdp_context * context);
75 void vdp_run_context(vdp_context * context, uint32_t target_cycles);
76 //runs from current cycle count to VBLANK for the current mode, returns ending cycle count
77 uint32_t vdp_run_to_vblank(vdp_context * context);
78 void vdp_load_savestate(vdp_context * context, FILE * state_file);
79
80 #endif //VDP_H_