Mercurial > repos > blastem
annotate cd_graphics.c @ 2457:9da3de58410d
Fix libretro build
author | Michael Pavone <pavone@retrodev.com> |
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date | Wed, 21 Feb 2024 20:25:06 -0800 |
parents | a1afe26a8ef0 |
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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 #include "render.h" |
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4 |
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5 void cd_graphics_init(segacd_context *cd) |
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6 { |
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7 cd->graphics_int_cycle = CYCLE_NEVER; |
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8 } |
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9 |
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10 #define BIT_HFLIP 0x8000 |
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11 |
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12 static uint8_t get_src_pixel(segacd_context *cd) |
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13 { |
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14 uint16_t x = cd->graphics_x >> 11; |
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15 uint16_t y = cd->graphics_y >> 11; |
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16 cd->graphics_x += cd->graphics_dx; |
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17 cd->graphics_x &= 0xFFFFFF; |
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18 cd->graphics_y += cd->graphics_dy; |
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19 cd->graphics_y &= 0xFFFFFF; |
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20 uint16_t stamp_shift, pixel_mask; |
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21 uint16_t stamp_num_mask; |
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22 if (cd->gate_array[GA_STAMP_SIZE] & BIT_STS) { |
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23 //32x32 stamps |
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24 stamp_shift = 5; |
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25 pixel_mask = 0x1F; |
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26 stamp_num_mask = 0x7FC; |
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27 } else { |
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28 //16x16 stamps |
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29 stamp_shift = 4; |
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30 pixel_mask = 0xF; |
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31 stamp_num_mask = 0x7FF; |
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32 } |
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33 uint16_t stamp_x = x >> stamp_shift; |
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34 uint16_t stamp_y = y >> stamp_shift; |
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35 uint16_t max, base_mask; |
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36 uint32_t row_shift; |
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37 if (cd->gate_array[GA_STAMP_SIZE] & BIT_SMS) { |
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38 max = 4096 >> stamp_shift; |
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39 base_mask = 0xE000 << ((5 - stamp_shift) << 1); |
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40 //128 stamps in 32x32 mode, 256 stamps in 16x16 mode |
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41 row_shift = 12 - stamp_shift; |
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42 } else { |
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43 max = 256 >> stamp_shift; |
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44 base_mask = 0xFFE0 << ((5 - stamp_shift) << 1); |
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45 //8 stamps in 32x32 mode, 16 stamps in 16x16 mode |
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46 row_shift = 8 - stamp_shift; |
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47 } |
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48 if (stamp_x >= max || stamp_y >= max) { |
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49 if (cd->gate_array[GA_STAMP_SIZE] & BIT_RPT) { |
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50 stamp_x &= max - 1; |
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51 stamp_y &= max - 1; |
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52 } else { |
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53 return 0; |
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54 } |
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55 } |
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56 uint32_t address = (cd->gate_array[GA_STAMP_MAP_BASE] & base_mask) << 1; |
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57 address += (stamp_y << row_shift) + stamp_x; |
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58 uint16_t stamp_def = cd->word_ram[address]; |
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59 uint16_t stamp_num = stamp_def & stamp_num_mask; |
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60 if (!stamp_num) { |
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61 //manual says stamp 0 can't be used, I assume that means it's treated as transparent |
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62 return 0; |
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63 } |
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64 uint16_t pixel_x = x & pixel_mask; |
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65 uint16_t pixel_y = y & pixel_mask; |
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66 if (stamp_def & BIT_HFLIP) { |
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67 pixel_x = pixel_mask - pixel_x; |
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68 } |
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69 uint16_t tmp; |
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70 switch (stamp_def >> 13 & 3) |
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71 { |
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72 case 0: |
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73 break; |
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74 case 1: |
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75 tmp = pixel_y; |
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76 pixel_y = pixel_x; |
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77 pixel_x = pixel_mask - tmp; |
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78 break; |
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79 case 2: |
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80 pixel_y = pixel_mask - pixel_y; |
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81 pixel_x = pixel_mask - pixel_x; |
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82 break; |
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83 case 3: |
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84 tmp = pixel_y; |
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85 pixel_y = pixel_mask - pixel_x; |
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86 pixel_x = tmp; |
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87 break; |
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88 } |
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89 uint16_t cell_x = pixel_x >> 3; |
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90 uint32_t pixel_address = stamp_num << 6; |
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91 pixel_address += (pixel_y << 1) + (cell_x << (stamp_shift + 1)) + (pixel_x >> 2 & 1); |
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92 uint16_t word = cd->word_ram[pixel_address]; |
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93 switch (pixel_x & 3) |
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94 { |
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95 default: |
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96 case 0: |
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97 return word >> 12; |
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98 case 1: |
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99 return word >> 8 & 0xF; |
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100 case 2: |
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101 return word >> 4 & 0xF; |
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102 case 3: |
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103 return word & 0xF; |
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104 } |
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105 |
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106 } |
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107 |
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108 enum { |
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109 FETCH_X, |
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110 FETCH_Y, |
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111 FETCH_DX, |
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112 FETCH_DY, |
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113 PIXEL0, |
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114 PIXEL1, |
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115 PIXEL2, |
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116 PIXEL3, |
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117 DRAW |
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118 }; |
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119 |
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Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
changeset
|
120 void draw_pixels(segacd_context *cd) |
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Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
121 { |
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Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
122 uint16_t to_draw = 4 - (cd->graphics_dst_x & 3); |
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|
123 uint16_t x_end = cd->gate_array[GA_IMAGE_BUFFER_HDOTS] + (cd->gate_array[GA_IMAGE_BUFFER_OFFSET] & 7); |
2069
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Initial attempt at implementing the Sega CD graphics hardware
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parents:
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|
124 if (cd->graphics_dst_x + to_draw > x_end) { |
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Fix mask for CD graphics destination horizontal offset
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|
125 to_draw = cd->gate_array[GA_IMAGE_BUFFER_HDOTS] + (cd->gate_array[GA_IMAGE_BUFFER_OFFSET] & 7) - cd->graphics_dst_x; |
2069
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Initial attempt at implementing the Sega CD graphics hardware
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parents:
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|
126 } |
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Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
127 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
|
128 { |
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Initial attempt at implementing the Sega CD graphics hardware
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parents:
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|
129 uint32_t dst_address = cd->gate_array[GA_IMAGE_BUFFER_START] << 1; |
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Fix a few sega cd graphics processor bugs
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|
130 dst_address += cd->graphics_dst_y << 1; |
2069
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parents:
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|
131 dst_address += cd->graphics_dst_x >> 2 & 1; |
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Sega CD graphics processor output now looks correct for some operations
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132 dst_address += ((cd->graphics_dst_x >> 3) * (cd->gate_array[GA_IMAGE_BUFFER_VCELLS] + 1)) << 4; |
2069
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Initial attempt at implementing the Sega CD graphics hardware
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|
133 uint16_t pixel_shift = 12 - 4 * (cd->graphics_dst_x & 3); |
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Initial attempt at implementing the Sega CD graphics hardware
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diff
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|
134 uint16_t pixel = cd->graphics_pixels[i] << pixel_shift; |
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Fix a few sega cd graphics processor bugs
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diff
changeset
|
135 uint16_t src_mask_check = 0xF << pixel_shift; |
2069
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Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
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|
136 uint16_t src_mask_keep = ~src_mask_check; |
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Fix a few sega cd graphics processor bugs
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|
137 pixel &= src_mask_check; |
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Initial attempt at implementing the Sega CD graphics hardware
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|
138 switch (cd->gate_array[1] >> 3 & 3) |
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Initial attempt at implementing the Sega CD graphics hardware
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|
139 { |
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Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
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|
140 case 0: |
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Initial attempt at implementing the Sega CD graphics hardware
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parents:
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|
141 //priority mode off |
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Initial attempt at implementing the Sega CD graphics hardware
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|
142 cd->word_ram[dst_address] &= src_mask_keep; |
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parents:
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143 cd->word_ram[dst_address] |= pixel; |
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Initial attempt at implementing the Sega CD graphics hardware
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|
144 break; |
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Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
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|
145 case 1: |
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parents:
diff
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|
146 //underwrite |
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Initial attempt at implementing the Sega CD graphics hardware
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|
147 if (pixel && ! (cd->word_ram[dst_address] & src_mask_check)) { |
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diff
changeset
|
148 cd->word_ram[dst_address] &= src_mask_keep; |
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|
149 cd->word_ram[dst_address] |= pixel; |
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|
150 } |
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Initial attempt at implementing the Sega CD graphics hardware
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|
151 break; |
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Fix some bugs in the Sega CD graphics coprocessor
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|
152 case 2: |
2069
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|
153 //overwrite |
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Initial attempt at implementing the Sega CD graphics hardware
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changeset
|
154 if (pixel) { |
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Initial attempt at implementing the Sega CD graphics hardware
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changeset
|
155 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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changeset
|
156 cd->word_ram[dst_address] |= pixel; |
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Initial attempt at implementing the Sega CD graphics hardware
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|
157 } |
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Initial attempt at implementing the Sega CD graphics hardware
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|
158 break; |
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Initial attempt at implementing the Sega CD graphics hardware
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|
159 } |
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Fix a few sega cd graphics processor bugs
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|
160 cd->graphics_dst_x++; |
2069
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Initial attempt at implementing the Sega CD graphics hardware
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changeset
|
161 } |
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Initial attempt at implementing the Sega CD graphics hardware
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changeset
|
162 if (cd->graphics_dst_x == x_end) { |
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Initial attempt at implementing the Sega CD graphics hardware
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|
163 cd->graphics_dst_y++; |
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Initial attempt at implementing the Sega CD graphics hardware
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|
164 --cd->gate_array[GA_IMAGE_BUFFER_LINES]; |
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165 cd->gate_array[GA_TRACE_VECTOR_BASE] += 2; |
2069
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166 cd->graphics_step = FETCH_X; |
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diff
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|
167 } else { |
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Initial attempt at implementing the Sega CD graphics hardware
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|
168 cd->graphics_step = PIXEL0; |
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Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
changeset
|
169 } |
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Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
changeset
|
170 } |
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Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
changeset
|
171 |
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Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
changeset
|
172 #define CHECK_CYCLES cd->graphics_step++; if(cd->graphics_cycle >= cycle) break |
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Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
changeset
|
173 #define CHECK_ONLY if(cd->graphics_cycle >= cycle) break |
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Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
changeset
|
174 |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
changeset
|
175 static void do_graphics(segacd_context *cd, uint32_t cycle) |
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Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
changeset
|
176 { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
changeset
|
177 if (!cd->gate_array[GA_IMAGE_BUFFER_LINES]) { |
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Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
changeset
|
178 return; |
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Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
changeset
|
179 } |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
changeset
|
180 while (cd->graphics_cycle < cycle) |
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Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
changeset
|
181 { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
182 switch (cd->graphics_step) |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
183 { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
184 case FETCH_X: |
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Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
185 cd->graphics_x = cd->word_ram[cd->gate_array[GA_TRACE_VECTOR_BASE] << 1] << 8; |
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Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
186 cd->graphics_cycle += 3*4; |
2416
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Fix mask for CD graphics destination horizontal offset
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parents:
2271
diff
changeset
|
187 cd->graphics_dst_x = cd->gate_array[GA_IMAGE_BUFFER_OFFSET] & 7; |
2069
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Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
changeset
|
188 CHECK_CYCLES; |
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Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
changeset
|
189 case FETCH_Y: |
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Fix a few sega cd graphics processor bugs
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2069
diff
changeset
|
190 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
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parents:
diff
changeset
|
191 cd->graphics_cycle += 2*4; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
192 CHECK_CYCLES; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
changeset
|
193 case FETCH_DX: |
2071
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Fix a few sega cd graphics processor bugs
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2069
diff
changeset
|
194 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
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parents:
diff
changeset
|
195 if (cd->graphics_dx & 0x8000) { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
196 cd->graphics_dx |= 0xFF0000; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
197 } |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
198 cd->graphics_cycle += 2*4; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
199 CHECK_CYCLES; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
changeset
|
200 case FETCH_DY: |
2071
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Fix a few sega cd graphics processor bugs
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parents:
2069
diff
changeset
|
201 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
|
202 if (cd->graphics_dy & 0x8000) { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
203 cd->graphics_dy |= 0xFF0000; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
204 } |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
205 cd->graphics_cycle += 2*4; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
206 CHECK_CYCLES; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
207 case PIXEL0: |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
changeset
|
208 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
|
209 cd->graphics_cycle += 2*4; |
2416
a1afe26a8ef0
Fix mask for CD graphics destination horizontal offset
Michael Pavone <pavone@retrodev.com>
parents:
2271
diff
changeset
|
210 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] & 7))) { |
2069
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
211 cd->graphics_step = DRAW; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
212 CHECK_ONLY; |
2092
8665d8da0e1c
Fix infinite loop in Sega CD graphics coprocessor code
Michael Pavone <pavone@retrodev.com>
parents:
2077
diff
changeset
|
213 goto draw; |
2069
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
214 } else { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
215 CHECK_CYCLES; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
216 } |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
217 case PIXEL1: |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
218 cd->graphics_pixels[1] = get_src_pixel(cd); |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
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parents:
diff
changeset
|
219 cd->graphics_cycle += 2*4; |
2416
a1afe26a8ef0
Fix mask for CD graphics destination horizontal offset
Michael Pavone <pavone@retrodev.com>
parents:
2271
diff
changeset
|
220 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] & 7))) { |
2069
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
221 cd->graphics_step = DRAW; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
222 CHECK_ONLY; |
2092
8665d8da0e1c
Fix infinite loop in Sega CD graphics coprocessor code
Michael Pavone <pavone@retrodev.com>
parents:
2077
diff
changeset
|
223 goto draw; |
2069
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
224 } else { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
225 CHECK_CYCLES; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
226 } |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
227 case PIXEL2: |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
228 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
|
229 cd->graphics_cycle += 2*4; |
2416
a1afe26a8ef0
Fix mask for CD graphics destination horizontal offset
Michael Pavone <pavone@retrodev.com>
parents:
2271
diff
changeset
|
230 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] & 7))) { |
2069
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
231 cd->graphics_step = DRAW; |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
232 CHECK_ONLY; |
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233 goto draw; |
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234 } else { |
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235 CHECK_CYCLES; |
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236 } |
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237 case PIXEL3: |
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238 cd->graphics_pixels[3] = get_src_pixel(cd); |
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239 cd->graphics_cycle += 2*4; |
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240 CHECK_CYCLES; |
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241 draw: |
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242 case DRAW: |
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243 draw_pixels(cd); |
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244 cd->graphics_cycle += 1*4; |
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245 if (!cd->gate_array[GA_IMAGE_BUFFER_LINES]) { |
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246 return; |
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247 } |
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248 CHECK_ONLY; |
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249 } |
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250 } |
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251 } |
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252 |
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253 void scd_toggle_graphics_debug(segacd_context *cd) |
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254 { |
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255 if (cd->graphics_debug_window) { |
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256 render_destroy_window(cd->graphics_debug_window); |
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257 cd->graphics_debug_window = 0; |
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258 } else { |
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259 cd->graphics_debug_window = render_create_window("CD ASIC", 1024, 1024, NULL); |
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260 } |
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261 } |
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262 |
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263 static void render_graphics_debug(segacd_context *cd) |
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264 { |
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265 int pitch; |
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266 uint32_t *fb = render_get_framebuffer(cd->graphics_debug_window, &pitch); |
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267 uint32_t pixels = (cd->gate_array[GA_STAMP_SIZE] & BIT_SMS) ? 4096 : 256; |
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268 uint32_t stamp_size = (cd->gate_array[GA_STAMP_SIZE] & BIT_STS) ? 32 : 16; |
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269 uint32_t num_stamps = pixels / stamp_size; |
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270 //TODO: fix mask based on SMS and STS |
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271 uint32_t address = (cd->gate_array[GA_STAMP_MAP_BASE] & 0xFFE0) << 1; |
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272 genesis_context *gen = cd->genesis; |
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273 for (uint32_t stamp_y = 0; stamp_y < num_stamps; stamp_y++) |
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274 { |
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275 uint32_t start_y = stamp_y * stamp_size; |
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276 for (uint32_t stamp_x = 0; stamp_x < num_stamps; stamp_x++) |
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277 { |
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278 uint16_t entry = cd->word_ram[address++]; |
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279 uint32_t tile_address = (entry & 0x7FF) << 6; |
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280 //TODO: flip and rotation |
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281 uint32_t start_x = stamp_x * stamp_size; |
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282 if (start_x < 1024 && start_y < 1024) { |
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283 for (uint32_t tile_x = start_x; tile_x < start_x + stamp_size; tile_x+=8) |
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284 { |
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285 for (uint32_t y = start_y; y < start_y + stamp_size; y++) |
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286 { |
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287 uint32_t *line = fb + y * pitch / sizeof(uint32_t); |
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288 for (uint32_t x = tile_x; x < tile_x + 8; x += 4) |
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289 { |
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290 |
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291 uint16_t word = cd->word_ram[tile_address++]; |
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292 uint16_t pixels[4] = { |
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293 word >> 12, |
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294 word >> 8 & 0xF, |
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295 word >> 4 & 0xF, |
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296 word & 0xF |
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297 }; |
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298 for (uint32_t i = 0; i < 4; i++) |
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299 { |
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300 line[x + i] = gen->vdp->colors[pixels[i]]; |
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301 } |
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302 } |
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303 } |
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304 } |
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305 } |
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306 } |
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307 } |
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308 render_framebuffer_updated(cd->graphics_debug_window, 1024); |
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309 } |
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310 |
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311 void cd_graphics_run(segacd_context *cd, uint32_t cycle) |
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312 { |
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313 while (cd->graphics_cycle < cycle) |
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314 { |
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315 if (cd->gate_array[GA_STAMP_SIZE] & BIT_GRON) { |
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316 do_graphics(cd, cycle); |
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317 //end calculation and actual emulated execution time probably don't 100% line up yet |
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318 //deal with that here for now |
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319 for(; cd->graphics_cycle < cycle; cd->graphics_cycle += 4) |
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320 { |
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321 } |
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322 if (cd->graphics_cycle >= cd->graphics_int_cycle) { |
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323 printf("graphics end %u\n", cd->graphics_cycle); |
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324 cd->gate_array[GA_STAMP_SIZE] &= ~BIT_GRON; |
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325 |
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326 if (cd->graphics_debug_window) { |
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327 render_graphics_debug(cd); |
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328 } |
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329 break; |
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330 } |
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331 } else { |
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332 cd->graphics_cycle = cycle; |
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333 } |
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334 } |
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335 } |
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336 void cd_graphics_start(segacd_context *cd) |
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337 { |
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338 if (!(cd->gate_array[GA_STAMP_SIZE] & BIT_GRON)) { |
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339 |
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340 cd->gate_array[GA_STAMP_SIZE] |= BIT_GRON; |
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341 //Manual scan is bad, but formula appears to be |
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342 // vsize * (13 + 2 * hoffset + 9 * (hdots + hoffset - 1)) |
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343 //with an additional 13? cycle setup cost per line |
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344 uint32_t lines = cd->gate_array[GA_IMAGE_BUFFER_LINES]; |
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345 uint32_t hdots = cd->gate_array[GA_IMAGE_BUFFER_HDOTS]; |
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346 uint32_t hoffset = cd->gate_array[GA_IMAGE_BUFFER_OFFSET] & 7; |
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347 uint16_t pm = cd->gate_array[1] >> 3 & 3; |
2069
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
348 cd->graphics_int_cycle = cd->graphics_cycle + 4 * lines * (13 + 2 * hoffset + 9 * (hdots + hoffset - 1)); |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
349 cd->graphics_dst_y = cd->gate_array[GA_IMAGE_BUFFER_OFFSET] >> 3; |
2098
da326c32ad8f
Fix some bugs in the Sega CD graphics coprocessor
Michael Pavone <pavone@retrodev.com>
parents:
2092
diff
changeset
|
350 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]); |
2077
c3241eff3c3a
Sega CD graphics processor output now looks correct for some operations
Michael Pavone <pavone@retrodev.com>
parents:
2071
diff
changeset
|
351 cd->graphics_step = FETCH_X; |
2069
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
352 } else { |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
353 printf("graphics start ignored @ %u\n", cd->graphics_cycle); |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
354 } |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
355 |
8e51c0c3f2e3
Initial attempt at implementing the Sega CD graphics hardware
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
356 } |