Mercurial > repos > simple16
annotate src/vdp.h @ 21:91ded3b12d96
Only run rendering hardware when display is enabled
author | Michael Pavone <pavone@retrodev.com> |
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date | Tue, 29 Mar 2016 19:59:26 -0700 |
parents | 04fc17376999 |
children | 407725d9a02f |
rev | line source |
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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 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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11 |
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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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15 |
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16 uint16_t vcounter; |
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17 uint16_t hcounter; |
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18 |
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19 uint16_t vscroll; |
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20 uint16_t hscroll; |
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21 |
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22 uint16_t draw_source; |
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23 uint16_t draw_dest; |
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24 |
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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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29 |
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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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34 |
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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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46 |
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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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52 |
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53 #endif //VDP_H_ |