Mercurial > repos > blastem
annotate cd_graphics.c @ 2147:4cd60eecb0b1
Fix LC8951 cycle adjustment for data transfer next byte tracking
author | Michael Pavone <pavone@retrodev.com> |
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date | Sat, 26 Mar 2022 20:10:51 -0700 |
parents | da326c32ad8f |
children | 3ef80963c2a7 |
rev | line source |
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1 #include "cd_graphics.h" |
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2 #include "backend.h" |
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3 |
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4 void cd_graphics_init(segacd_context *cd) |
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5 { |
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6 cd->graphics_int_cycle = CYCLE_NEVER; |
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7 } |
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8 |
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9 #define BIT_HFLIP 0x8000 |
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10 |
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11 static uint8_t get_src_pixel(segacd_context *cd) |
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12 { |
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13 uint16_t x = cd->graphics_x >> 11; |
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14 uint16_t y = cd->graphics_y >> 11; |
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15 cd->graphics_x += cd->graphics_dx; |
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16 cd->graphics_x &= 0xFFFFFF; |
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17 cd->graphics_y += cd->graphics_dy; |
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18 cd->graphics_y &= 0xFFFFFF; |
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19 uint16_t stamp_shift, pixel_mask; |
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20 uint16_t stamp_num_mask; |
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21 if (cd->gate_array[GA_STAMP_SIZE] & BIT_STS) { |
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22 //32x32 stamps |
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23 stamp_shift = 5; |
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24 pixel_mask = 0x1F; |
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25 stamp_num_mask = 0x3FC; |
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26 } else { |
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27 //16x16 stamps |
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28 stamp_shift = 4; |
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29 pixel_mask = 0xF; |
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30 stamp_num_mask = 0x3FF; |
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31 } |
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32 uint16_t stamp_x = x >> stamp_shift; |
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33 uint16_t stamp_y = y >> stamp_shift; |
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34 uint16_t max, base_mask; |
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35 uint32_t row_shift; |
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36 if (cd->gate_array[GA_STAMP_SIZE] & BIT_SMS) { |
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37 max = 4096 >> stamp_shift; |
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38 base_mask = 0xE000 << ((5 - stamp_shift) << 1); |
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39 //128 stamps in 32x32 mode, 256 stamps in 16x16 mode |
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40 row_shift = 12 - stamp_shift; |
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41 } else { |
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42 max = 256 >> stamp_shift; |
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43 base_mask = 0xFFE0 << ((5 - stamp_shift) << 1); |
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44 //8 stamps in 32x32 mode, 16 stamps in 16x16 mode |
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45 row_shift = 8 - stamp_shift; |
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46 } |
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47 if (stamp_x >= max || stamp_y >= max) { |
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48 if (cd->gate_array[GA_STAMP_SIZE] & BIT_RPT) { |
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49 stamp_x &= max - 1; |
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50 stamp_y &= max - 1; |
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51 } else { |
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52 return 0; |
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53 } |
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54 } |
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55 uint32_t address = (cd->gate_array[GA_STAMP_MAP_BASE] & base_mask) << 1; |
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56 address += (stamp_y << row_shift) + stamp_x; |
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57 uint16_t stamp_def = cd->word_ram[address]; |
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58 uint16_t stamp_num = stamp_def & stamp_num_mask; |
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59 if (!stamp_num) { |
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60 //manual says stamp 0 can't be used, I assume that means it's treated as transparent |
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61 return 0; |
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62 } |
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63 uint16_t pixel_x = x & pixel_mask; |
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64 uint16_t pixel_y = y & pixel_mask; |
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65 if (stamp_def & BIT_HFLIP) { |
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66 pixel_x = pixel_mask - pixel_x; |
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67 } |
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68 uint16_t tmp; |
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69 switch (stamp_def >> 13 & 3) |
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70 { |
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71 case 0: |
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72 break; |
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73 case 1: |
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74 tmp = pixel_y; |
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75 pixel_y = pixel_x; |
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76 pixel_x = pixel_mask - tmp; |
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77 break; |
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78 case 2: |
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79 pixel_y = pixel_mask - pixel_y; |
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80 pixel_x = pixel_mask - pixel_x; |
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81 break; |
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82 case 3: |
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83 tmp = pixel_y; |
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84 pixel_y = pixel_mask - pixel_x; |
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85 pixel_x = tmp; |
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86 break; |
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87 } |
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88 uint16_t cell_x = pixel_x >> 3; |
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89 uint32_t pixel_address = stamp_num << 6; |
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90 pixel_address += (pixel_y << 1) + (cell_x << (stamp_shift + 1)) + (pixel_x >> 2 & 1); |
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91 uint16_t word = cd->word_ram[pixel_address]; |
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92 switch (pixel_x & 3) |
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93 { |
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94 default: |
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95 case 0: |
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96 return word >> 12; |
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97 case 1: |
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98 return word >> 8 & 0xF; |
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99 case 2: |
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100 return word >> 4 & 0xF; |
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101 case 3: |
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102 return word & 0xF; |
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103 } |
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104 |
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105 } |
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106 |
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107 enum { |
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108 FETCH_X, |
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109 FETCH_Y, |
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110 FETCH_DX, |
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111 FETCH_DY, |
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112 PIXEL0, |
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113 PIXEL1, |
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114 PIXEL2, |
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115 PIXEL3, |
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116 DRAW |
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117 }; |
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118 |
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119 void draw_pixels(segacd_context *cd) |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
120 { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
121 uint16_t to_draw = 4 - (cd->graphics_dst_x & 3); |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
122 uint16_t x_end = cd->gate_array[GA_IMAGE_BUFFER_HDOTS] + (cd->gate_array[GA_IMAGE_BUFFER_OFFSET] & 3); |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
123 if (cd->graphics_dst_x + to_draw > x_end) { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
124 to_draw = cd->gate_array[GA_IMAGE_BUFFER_HDOTS] + (cd->gate_array[GA_IMAGE_BUFFER_OFFSET] & 3) - cd->graphics_dst_x; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
125 } |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
126 for(uint16_t i = 0; i < to_draw; i++) |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
127 { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
128 uint32_t dst_address = cd->gate_array[GA_IMAGE_BUFFER_START] << 1; |
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Fix a few sega cd graphics processor bugs
Michael Pavone <pavone@retrodev.com>
parents:
2069
diff
changeset
|
129 dst_address += cd->graphics_dst_y << 1; |
2069
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
130 dst_address += cd->graphics_dst_x >> 2 & 1; |
2077
c3241eff3c3a
Sega CD graphics processor output now looks correct for some operations
Michael Pavone <pavone@retrodev.com>
parents:
2071
diff
changeset
|
131 dst_address += ((cd->graphics_dst_x >> 3) * (cd->gate_array[GA_IMAGE_BUFFER_VCELLS] + 1)) << 4; |
2069
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
132 uint16_t pixel_shift = 12 - 4 * (cd->graphics_dst_x & 3); |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
133 uint16_t pixel = cd->graphics_pixels[i] << pixel_shift; |
2071
598017ef4b0d
Fix a few sega cd graphics processor bugs
Michael Pavone <pavone@retrodev.com>
parents:
2069
diff
changeset
|
134 uint16_t src_mask_check = 0xF << pixel_shift; |
2069
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
135 uint16_t src_mask_keep = ~src_mask_check; |
2071
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Fix a few sega cd graphics processor bugs
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parents:
2069
diff
changeset
|
136 pixel &= src_mask_check; |
2069
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
137 switch (cd->gate_array[1] >> 3 & 3) |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
138 { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
139 case 0: |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
140 //priority mode off |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
141 cd->word_ram[dst_address] &= src_mask_keep; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
142 cd->word_ram[dst_address] |= pixel; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
143 break; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
144 case 1: |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
145 //underwrite |
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Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
146 if (pixel && ! (cd->word_ram[dst_address] & src_mask_check)) { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
147 cd->word_ram[dst_address] &= src_mask_keep; |
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Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
changeset
|
148 cd->word_ram[dst_address] |= pixel; |
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Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
149 } |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
150 break; |
2098
da326c32ad8f
Fix some bugs in the Sega CD graphics coprocessor
Michael Pavone <pavone@retrodev.com>
parents:
2092
diff
changeset
|
151 case 2: |
2069
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Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
changeset
|
152 //overwrite |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
153 if (pixel) { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
154 cd->word_ram[dst_address] &= src_mask_keep; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
155 cd->word_ram[dst_address] |= pixel; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
156 } |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
157 break; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
158 } |
2071
598017ef4b0d
Fix a few sega cd graphics processor bugs
Michael Pavone <pavone@retrodev.com>
parents:
2069
diff
changeset
|
159 cd->graphics_dst_x++; |
2069
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
160 } |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
161 if (cd->graphics_dst_x == x_end) { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
162 cd->graphics_dst_y++; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
163 --cd->gate_array[GA_IMAGE_BUFFER_LINES]; |
2071
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Fix a few sega cd graphics processor bugs
Michael Pavone <pavone@retrodev.com>
parents:
2069
diff
changeset
|
164 cd->gate_array[GA_TRACE_VECTOR_BASE] += 2; |
2069
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
changeset
|
165 cd->graphics_step = FETCH_X; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
166 } else { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
167 cd->graphics_step = PIXEL0; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
168 } |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
169 } |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
170 |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
171 #define CHECK_CYCLES cd->graphics_step++; if(cd->graphics_cycle >= cycle) break |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
172 #define CHECK_ONLY if(cd->graphics_cycle >= cycle) break |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
173 |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
174 static void do_graphics(segacd_context *cd, uint32_t cycle) |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
175 { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
176 if (!cd->gate_array[GA_IMAGE_BUFFER_LINES]) { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
177 return; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
178 } |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
179 while (cd->graphics_cycle < cycle) |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
180 { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
181 switch (cd->graphics_step) |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
182 { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
183 case FETCH_X: |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
184 cd->graphics_x = cd->word_ram[cd->gate_array[GA_TRACE_VECTOR_BASE] << 1] << 8; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
185 cd->graphics_cycle += 3*4; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
186 cd->graphics_dst_x = cd->gate_array[GA_IMAGE_BUFFER_OFFSET] & 3; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
187 CHECK_CYCLES; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
188 case FETCH_Y: |
2071
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Fix a few sega cd graphics processor bugs
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parents:
2069
diff
changeset
|
189 cd->graphics_y = cd->word_ram[(cd->gate_array[GA_TRACE_VECTOR_BASE] << 1) + 1] << 8; |
2069
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
190 cd->graphics_cycle += 2*4; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
191 CHECK_CYCLES; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
192 case FETCH_DX: |
2071
598017ef4b0d
Fix a few sega cd graphics processor bugs
Michael Pavone <pavone@retrodev.com>
parents:
2069
diff
changeset
|
193 cd->graphics_dx = cd->word_ram[(cd->gate_array[GA_TRACE_VECTOR_BASE] << 1) + 2]; |
2069
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
194 if (cd->graphics_dx & 0x8000) { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
195 cd->graphics_dx |= 0xFF0000; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
196 } |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
197 cd->graphics_cycle += 2*4; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
198 CHECK_CYCLES; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
199 case FETCH_DY: |
2071
598017ef4b0d
Fix a few sega cd graphics processor bugs
Michael Pavone <pavone@retrodev.com>
parents:
2069
diff
changeset
|
200 cd->graphics_dy = cd->word_ram[(cd->gate_array[GA_TRACE_VECTOR_BASE] << 1) + 3]; |
2069
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
201 if (cd->graphics_dy & 0x8000) { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
202 cd->graphics_dy |= 0xFF0000; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
203 } |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
204 cd->graphics_cycle += 2*4; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
205 CHECK_CYCLES; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
206 case PIXEL0: |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
207 cd->graphics_pixels[0] = get_src_pixel(cd); |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
208 cd->graphics_cycle += 2*4; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
209 if ((cd->graphics_dst_x & 3) == 3 || (cd->graphics_dst_x + 1 == cd->gate_array[GA_IMAGE_BUFFER_HDOTS] + (cd->gate_array[GA_IMAGE_BUFFER_OFFSET] & 3))) { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
210 cd->graphics_step = DRAW; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
211 CHECK_ONLY; |
2092
8665d8da0e1c
Fix infinite loop in Sega CD graphics coprocessor code
Michael Pavone <pavone@retrodev.com>
parents:
2077
diff
changeset
|
212 goto draw; |
2069
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
213 } else { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
214 CHECK_CYCLES; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
215 } |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
216 case PIXEL1: |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
217 cd->graphics_pixels[1] = get_src_pixel(cd); |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
218 cd->graphics_cycle += 2*4; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
219 if ((cd->graphics_dst_x & 3) == 2 || (cd->graphics_dst_x + 2 == cd->gate_array[GA_IMAGE_BUFFER_HDOTS] + (cd->gate_array[GA_IMAGE_BUFFER_OFFSET] & 3))) { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
220 cd->graphics_step = DRAW; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
221 CHECK_ONLY; |
2092
8665d8da0e1c
Fix infinite loop in Sega CD graphics coprocessor code
Michael Pavone <pavone@retrodev.com>
parents:
2077
diff
changeset
|
222 goto draw; |
2069
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
223 } else { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
224 CHECK_CYCLES; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
225 } |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
226 case PIXEL2: |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
227 cd->graphics_pixels[2] = get_src_pixel(cd); |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
228 cd->graphics_cycle += 2*4; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
229 if ((cd->graphics_dst_x & 3) == 1 || (cd->graphics_dst_x + 3 == cd->gate_array[GA_IMAGE_BUFFER_HDOTS] + (cd->gate_array[GA_IMAGE_BUFFER_OFFSET] & 3))) { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
230 cd->graphics_step = DRAW; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
231 CHECK_ONLY; |
2092
8665d8da0e1c
Fix infinite loop in Sega CD graphics coprocessor code
Michael Pavone <pavone@retrodev.com>
parents:
2077
diff
changeset
|
232 goto draw; |
2069
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
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233 } else { |
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234 CHECK_CYCLES; |
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235 } |
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236 case PIXEL3: |
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237 cd->graphics_pixels[3] = get_src_pixel(cd); |
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238 cd->graphics_cycle += 2*4; |
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239 CHECK_CYCLES; |
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240 draw: |
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241 case DRAW: |
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242 draw_pixels(cd); |
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243 cd->graphics_cycle += 1*4; |
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244 if (!cd->gate_array[GA_IMAGE_BUFFER_LINES]) { |
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245 return; |
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246 } |
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247 CHECK_ONLY; |
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248 } |
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249 } |
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250 } |
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251 |
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252 void cd_graphics_run(segacd_context *cd, uint32_t cycle) |
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253 { |
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254 while (cd->graphics_cycle < cycle) |
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255 { |
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256 if (cd->gate_array[GA_STAMP_SIZE] & BIT_GRON) { |
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257 do_graphics(cd, cycle); |
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258 //end calculation and actual emulated execution time probably don't 100% line up yet |
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259 //deal with that here for now |
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260 for(; cd->graphics_cycle < cycle; cd->graphics_cycle += 4) |
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261 { |
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262 } |
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263 if (cd->graphics_cycle >= cd->graphics_int_cycle) { |
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264 printf("graphics end %u\n", cd->graphics_cycle); |
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265 cd->gate_array[GA_STAMP_SIZE] &= ~BIT_GRON; |
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266 break; |
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267 } |
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268 } else { |
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269 cd->graphics_cycle = cycle; |
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270 } |
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271 } |
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272 } |
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273 void cd_graphics_start(segacd_context *cd) |
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274 { |
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275 if (!(cd->gate_array[GA_STAMP_SIZE] & BIT_GRON)) { |
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276 |
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277 cd->gate_array[GA_STAMP_SIZE] |= BIT_GRON; |
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278 //Manual scan is bad, but formula appears to be |
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279 // vsize * (13 + 2 * hoffset + 9 * (hdots + hoffset - 1)) |
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280 //with an additional 13? cycle setup cost per line |
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281 uint32_t lines = cd->gate_array[GA_IMAGE_BUFFER_LINES]; |
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282 uint32_t hdots = cd->gate_array[GA_IMAGE_BUFFER_HDOTS]; |
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283 uint32_t hoffset = cd->gate_array[GA_IMAGE_BUFFER_OFFSET] & 3; |
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284 uint16_t pm = cd->gate_array[1] >> 3 & 3; |
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285 cd->graphics_int_cycle = cd->graphics_cycle + 4 * lines * (13 + 2 * hoffset + 9 * (hdots + hoffset - 1)); |
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286 cd->graphics_dst_y = cd->gate_array[GA_IMAGE_BUFFER_OFFSET] >> 3; |
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287 printf("graphics start @ %u, %u lines, %u hdots, pm = %u, hoff = %u, voff = %u, addr = %X\n", cd->graphics_cycle, lines, hdots, pm, hoffset, cd->graphics_dst_y, cd->gate_array[GA_IMAGE_BUFFER_START]); |
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288 cd->graphics_step = FETCH_X; |
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289 } else { |
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290 printf("graphics start ignored @ %u\n", cd->graphics_cycle); |
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291 } |
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292 |
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293 } |