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annotate jag_video.h @ 1088:c0a026e974f4

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Basic handling of video/object processor register writes
author Michael Pavone <pavone@retrodev.com>
date Sat, 08 Oct 2016 23:49:20 -0700
parents 6433d4d05934
children 87597a048d38
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1 #ifndef JAG_VIDEO_H_
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2 #define JAG_VIDEO_H_
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3
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4 enum {
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5 VID_HCOUNT,
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6 VID_VCOUNT,
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7 VID_HLPEN,
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8 VID_VLPEN,
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9 VID_REG_C,
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10 VID_REG_E,
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11 VID_OBJ0,
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12 VID_OBJ1,
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13 VID_OBJ2,
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14 VID_OBJ3,
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15 VID_REG_18,
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16 VID_REG_1A,
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17 VID_REG_1C,
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18 VID_REG_1E,
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19 VID_OBJLIST1,
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20 VID_OBJLIST2,
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21 VID_REG_24,
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22 VID_OBJFLAG,
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23 VID_VMODE,
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24 VID_BORDER_RG,
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25 VID_BORDER_B,
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26 VID_HPERIOD,
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27 VID_HBLANK_BEGIN,
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28 VID_HBLANK_END,
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29 VID_HSYNC,
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30 VID_HVSYNC,
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31 VID_HDISP_BEGIN1,
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32 VID_HDISP_BEGIN2,
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33 VID_HDISP_END,
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34 VID_VPERIOD,
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35 VID_VBLANK_BEGIN,
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36 VID_VBLANK_END,
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37 VID_VSYNC,
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38 VID_VDISP_BEGIN,
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39 VID_VDISP_END,
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40 VID_VEQUAL_BEGIN,
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41 VID_VEQUAL_END,
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42 VID_VINT,
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43 VID_PIT0,
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44 VID_PIT1,
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45 VID_HEQUAL_END,
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46 VID_REG_56,
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47 VID_BGCOLOR,
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48 JAG_VIDEO_REGS
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49 };
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50 #define LINEBUFFER_WORDS 720
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51
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52 typedef struct {
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53 uint16_t regs[JAG_VIDEO_REGS];
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54
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55 uint16_t clut[256];
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56 uint16_t line_buffer_a[LINEBUFFER_WORDS];
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57 uint16_t line_buffer_b[LINEBUFFER_WORDS];
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58 uint16_t *write_line_buffer;
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59 uint16_t *read_line_buffer;
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60
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61 uint32_t cycles;
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62 uint8_t pclock_div;
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63 uint8_t pclock_counter;
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64 uint8_t mode;
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65 } jag_video;
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66
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67
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68 jag_video *jag_video_init(void);
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69 void jag_video_run(jag_video *context, uint32_t target_cycle);
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70 void jag_video_reg_write(jag_video *context, uint32_t address, uint16_t value);
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71
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72 #endif //JAG_VIDEO_H_