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annotate src/vdp.h @ 23:a085f17b79e9

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Implement hflip
author Michael Pavone <pavone@retrodev.com>
date Wed, 30 Mar 2016 20:31:04 -0700
parents 407725d9a02f
children 083347ccd508
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1 #ifndef VDP_H_
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2 #define VDP_H_
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4 typedef struct {
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5 uint16_t source;
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6 uint16_t x;
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7 uint8_t hflip;
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8 uint8_t palpriority;
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9 } sprite_draw;
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11 typedef struct {
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12 uint16_t *framebuffer;
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13 uint8_t *drawbuffer;
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14 uint8_t *readbuffer;
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15 uint32_t cycles;
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16 uint32_t clock_inc;
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17 int pitch;
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18
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19 uint16_t fifo;
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20 uint16_t dest_offset;
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21 uint16_t status;
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22
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23 uint16_t vcounter;
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24 uint16_t hcounter;
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26 uint16_t vscroll;
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27 uint16_t hscroll;
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29 uint16_t draw_source;
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30 uint16_t draw_dest;
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32
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33 uint16_t vram[32*512];
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34 uint8_t linebuffers[328*2];
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35 uint16_t sram[64*2];
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36 uint16_t cram[64];
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37
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38 sprite_draw sprite_draws[40];
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39
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40 uint8_t fifo_dest;
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41 uint8_t draw_counter;
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42 uint8_t hflip;
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43 uint8_t palpriority;
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44 uint8_t current_draw;
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45 } vdp;
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46
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47 enum {
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48 FIFO_DEST_INVALID,
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49 FIFO_DEST_VRAM,
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50 FIFO_DEST_SRAM,
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51 FIFO_DEST_CRAM
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52 };
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53
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54 #define VDP_STATUS_FIFO 1
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55 #define VDP_STATUS_VRAM 2
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56 #define VDP_STATUS_SRAM 4
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57 #define VDP_STATUS_ENABLED 8
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58 #define VDP_STATUS_SPRITE_SCAN 16
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60 void vdp_init(vdp *context, uint32_t clock_div);
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61 void vdp_run(vdp *context, uint32_t target);
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62 void vdp_write_address(vdp *context, uint16_t value);
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63 void vdp_write_data(vdp *context, uint16_t value);
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64 void vdp_write_hscroll(vdp *context, uint16_t value);
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66 #endif //VDP_H_