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annotate src/vdp.h @ 19:04fc17376999

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Sort of working tile rendering and tile test ROM
author Michael Pavone <pavone@retrodev.com>
date Mon, 28 Mar 2016 23:43:31 -0700
parents 04d8efe7a1f0
children 407725d9a02f
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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 *framebuffer;
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6 uint8_t *drawbuffer;
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7 uint8_t *readbuffer;
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8 uint32_t cycles;
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9 uint32_t clock_inc;
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10 int pitch;
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12 uint16_t fifo;
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13 uint16_t dest_offset;
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14 uint16_t status;
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16 uint16_t vcounter;
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17 uint16_t hcounter;
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19 uint16_t vscroll;
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20 uint16_t hscroll;
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22 uint16_t draw_source;
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23 uint16_t draw_dest;
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25 uint16_t vram[32*512];
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26 uint8_t linebuffers[328*2];
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27 uint16_t sram[64*2];
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28 uint16_t cram[64];
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30 uint8_t fifo_dest;
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31 uint8_t draw_counter;
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32 uint8_t palpriority;
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33 } vdp;
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35 enum {
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36 FIFO_DEST_INVALID,
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37 FIFO_DEST_VRAM,
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38 FIFO_DEST_SRAM,
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39 FIFO_DEST_CRAM
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40 };
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41
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42 #define VDP_STATUS_FIFO 1
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43 #define VDP_STATUS_VRAM 2
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44 #define VDP_STATUS_SRAM 4
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45 #define VDP_STATUS_ENABLED 8
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47 void vdp_init(vdp *context, uint32_t clock_div);
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48 void vdp_run(vdp *context, uint32_t target);
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49 void vdp_write_address(vdp *context, uint16_t value);
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50 void vdp_write_data(vdp *context, uint16_t value);
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51 void vdp_write_hscroll(vdp *context, uint16_t value);
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53 #endif //VDP_H_