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nuclear@6
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1 #include <stdint.h>
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nuclear@6
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2 #include "vdp.h"
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nuclear@6
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3 #include "io.h"
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nuclear@6
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4 #include "misc.h"
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nuclear@6
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5
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nuclear@7
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6 unsigned char vdp_shadow_reg[24];
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nuclear@7
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7
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nuclear@7
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8 static uint32_t tilemap_addr[3];
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nuclear@6
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9
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nuclear@6
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10 int vdp_init(void)
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nuclear@6
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11 {
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nuclear@7
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12 unsigned int mode1_flags = VDP_MSET2_DISP_BIT;
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nuclear@6
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13
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nuclear@6
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14 if(mdg_ispal()) {
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nuclear@7
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15 mode1_flags |= VDP_MSET2_30CELL_BIT;
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nuclear@6
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16 }
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nuclear@6
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17
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nuclear@7
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18 VDP_SET_REG(VDP_REG_MSET1, VDP_MSET1_BASE);
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nuclear@7
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19 VDP_SET_REG(VDP_REG_MSET2, VDP_MSET2_BASE | mode1_flags);
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nuclear@6
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20
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nuclear@6
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21 return 0;
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nuclear@6
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22 }
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nuclear@6
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23
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nuclear@6
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24 void vdp_set_tilemap_slot(int plane, int slot)
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nuclear@6
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25 {
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nuclear@6
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26 switch(plane) {
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nuclear@6
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27 case VDP_PLANE_A:
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nuclear@6
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28 VDP_SET_REG(VDP_REG_PADDR_A, (slot & 7) << 3);
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nuclear@7
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29 tilemap_addr[VDP_PLANE_A] = ((uint32_t)slot << 13);
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nuclear@6
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30 break;
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nuclear@6
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31
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nuclear@6
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32 case VDP_PLANE_WIN:
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nuclear@6
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33 VDP_SET_REG(VDP_REG_PADDR_WIN, (slot & 0x1f) << 1);
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nuclear@7
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34 tilemap_addr[VDP_PLANE_WIN] = ((uint32_t)slot << 11);
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nuclear@6
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35 break;
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nuclear@6
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36
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nuclear@6
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37 case VDP_PLANE_B:
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nuclear@6
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38 VDP_SET_REG(VDP_REG_PADDR_B, slot & 7);
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nuclear@7
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39 tilemap_addr[VDP_PLANE_B] = ((uint32_t)slot << 13);
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nuclear@6
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40 break;
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nuclear@6
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41 }
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nuclear@6
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42 }
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nuclear@6
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43
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nuclear@7
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44 uint32_t vdp_tilemap_addr(int plane)
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nuclear@6
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45 {
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nuclear@7
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46 return tilemap_addr[plane];
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nuclear@6
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47 }
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nuclear@6
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48
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nuclear@6
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49 void vdp_setpal_rgb24(int idx, int r, int g, int b)
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nuclear@6
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50 {
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nuclear@6
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51 VDP_SET_CRAM_ADDR(idx);
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nuclear@6
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52 VDP_SET_CRAM_RGB24(r, g, b);
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nuclear@6
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53 }
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nuclear@6
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54
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nuclear@6
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55 void vdp_setpal(int idx0, int count, unsigned char *pal)
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nuclear@6
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56 {
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nuclear@6
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57 int i;
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nuclear@6
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58
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nuclear@6
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59 VDP_SET_CRAM_ADDR(idx0);
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nuclear@6
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60 for(i=0; i<count; i++) {
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nuclear@6
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61 VDP_SET_CRAM_RGB24(pal[0], pal[1], pal[2]);
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nuclear@6
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62 pal += 3;
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nuclear@6
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63 }
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nuclear@6
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64 }
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nuclear@6
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65
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nuclear@6
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66 #define SCROLLSIZE(x) \
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nuclear@6
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67 do { \
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nuclear@6
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68 switch(xtiles) { \
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nuclear@6
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69 case 32: \
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nuclear@6
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70 case 64: \
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nuclear@6
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71 (x) >>= 6; \
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nuclear@6
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72 break; \
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nuclear@6
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73 case 128: \
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nuclear@6
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74 (x) = 3; \
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nuclear@6
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75 break; \
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nuclear@6
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76 default: \
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nuclear@6
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77 panic("invalid argument to %s: %d\n", (x), __func__); \
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nuclear@6
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78 } \
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nuclear@6
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79 } while(0)
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nuclear@6
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80
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nuclear@6
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81 void vdp_set_scroll_size(int xtiles, int ytiles)
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nuclear@6
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82 {
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nuclear@6
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83 SCROLLSIZE(xtiles);
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nuclear@6
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84 SCROLLSIZE(ytiles);
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nuclear@6
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85
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nuclear@6
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86 VDP_SET_REG(VDP_REG_SCROLL_SIZE, (ytiles << 4) | xtiles);
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nuclear@6
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87 }
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nuclear@7
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88
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nuclear@7
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89 void vdp_memcpy(uint32_t vaddr, void *src, int sz)
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nuclear@7
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90 {
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nuclear@7
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91 uint32_t saddr = (uint32_t)src;
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nuclear@7
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92 sz >>= 1; /* we'll transfer words */
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nuclear@7
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93 VDP_SET_REG_NOSHADOW(VDP_REG_MSET2,
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nuclear@7
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94 vdp_shadow_reg[VDP_REG_MSET2] | VDP_MSET2_DMA_BIT);
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nuclear@7
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95 VDP_SET_REG(VDP_REG_AUTOINC, 2);
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nuclear@7
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96 VDP_SET_REG(VDP_REG_DMALEN_LOW, sz);
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nuclear@7
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97 VDP_SET_REG(VDP_REG_DMALEN_HIGH, sz >> 8);
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nuclear@7
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98 VDP_SET_REG(VDP_REG_DMA_SADDR_LOW, saddr >> 1);
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nuclear@7
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99 VDP_SET_REG(VDP_REG_DMA_SADDR_MID, saddr >> 9);
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nuclear@7
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100 VDP_SET_REG(VDP_REG_DMA_SADDR_HIGH, saddr >> 17);
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nuclear@7
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101
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nuclear@7
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102 VDP_PORT_CTL = (vaddr & 0x3ffe) |
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nuclear@7
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103 }
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