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Rev | Author | Line No. | Line |
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5153 | IgorA | 1 | ; |
2 | ; We draw a triangle with various interpolations |
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3 | ; |
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5922 | IgorA | 4 | ; Порядок преобразований цветов вершин: |
5 | ; ZBufferPoint.r -> r1 (+drdl_min or +drdl_max) -> or1 (+drdx) -> [pixel buffer] |
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6 | ; ZBufferPoint.g -> g1 (+dgdl_min or +dgdl_max) -> og1 (+dgdx) -> [pixel buffer] |
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7 | ; ZBufferPoint.b -> b1 (+dbdl_min or +dbdl_max) -> ob1 (+dbdx) -> [pixel buffer] |
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8 | ; |
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9 | ; В некоторых случаях значения цвета (во 2-м байте переменных: or1,og1,ob1) |
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10 | ; может становиться < 0 или > 255, тогда появляються пиксели не правильного |
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11 | ; цвета. Скорее всего это связано с ошибками округления дробных чисел, |
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12 | ; при вычислении коэфициентов для плавного перехода цвета. |
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13 | ; |
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14 | ; Для лечения этой проблемы в версии на C++ специально ограничиваються |
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15 | ; минимальные и максимальные значения цвета точек (например от 3 до 252). |
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16 | ; Потому цвета граней могут немного отличаться от указанных в программе. |
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17 | ; |
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18 | ; В даной версии алгоритм немного другой. В наиболее вероятных местах появления |
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19 | ; пикселей не правильного цвета (обычно начало и конец линии) иправляеться |
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20 | ; цвет испорченных пикселей. Цвет получаеться наиболее близким к указанному |
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21 | ; пользователем. |
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22 | |||
5153 | IgorA | 23 | pr1 dd ? ;ZBufferPoint* |
24 | pr2 dd ? ;ZBufferPoint* |
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25 | l1 dd ? ;ZBufferPoint* |
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26 | l2 dd ? ;ZBufferPoint* |
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5175 | IgorA | 27 | fdx1 dd ? ;float |
28 | fdx2 dd ? ;float |
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29 | fdy1 dd ? ;float |
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30 | fdy2 dd ? ;float |
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6113 | IgorA | 31 | fz dd ? ;float - переменная отвечающая за геометрию фигуры |
5175 | IgorA | 32 | d1 dd ? ;float |
33 | d2 dd ? ;float |
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5153 | IgorA | 34 | pz1 dd ? ;unsigned short* |
35 | pp1 dd ? ;PIXEL* |
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36 | part dd ? |
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37 | update_left dd ? |
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38 | update_right dd ? |
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39 | |||
5187 | IgorA | 40 | nb_lines dd ? ;число горизонтальных линий в половине треугольника |
5153 | IgorA | 41 | dx1 dd ? |
42 | dy1 dd ? |
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5187 | IgorA | 43 | ;dx2 dd ? |
5153 | IgorA | 44 | dy2 dd ? |
45 | |||
5187 | IgorA | 46 | error dd ? ;int |
47 | derror dd ? ;int |
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48 | x1 dd ? ;int |
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49 | dxdy_min dd ? ;int |
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50 | dxdy_max dd ? ;int |
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5153 | IgorA | 51 | ; warning: x2 is multiplied by 2^16 |
5187 | IgorA | 52 | x2 dd ? ;int |
53 | dx2dy2 dd ? ;int |
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5153 | IgorA | 54 | |
6108 | IgorA | 55 | z dd ? ;uint |
6113 | IgorA | 56 | n dd ? ;int - длинна горизонтальной линии в пикселях |
57 | |||
5153 | IgorA | 58 | if INTERP_Z eq 1 |
5187 | IgorA | 59 | z1 dd ? ;int |
60 | dzdx dd ? ;int |
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61 | dzdy dd ? ;int |
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62 | dzdl_min dd ? ;int |
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63 | dzdl_max dd ? ;int |
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5153 | IgorA | 64 | end if |
65 | if INTERP_RGB eq 1 |
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66 | r1 dd ? ;int |
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67 | drdx dd ? |
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68 | drdy dd ? |
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69 | drdl_min dd ? |
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70 | drdl_max dd ? |
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71 | g1 dd ? |
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72 | dgdx dd ? |
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73 | dgdy dd ? |
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74 | dgdl_min dd ? |
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75 | dgdl_max dd ? |
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76 | b1 dd ? |
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77 | dbdx dd ? |
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78 | dbdy dd ? |
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79 | dbdl_min dd ? |
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80 | dbdl_max dd ? |
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6113 | IgorA | 81 | or1 dd ? ;uint |
82 | og1 dd ? ;uint |
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83 | ob1 dd ? ;uint |
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5153 | IgorA | 84 | end if |
85 | if INTERP_ST eq 1 |
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5187 | IgorA | 86 | s1 dd ? ;int |
87 | dsdy dd ? ;int |
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88 | dsdl_min dd ? ;int |
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89 | dsdl_max dd ? ;int |
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90 | t1 dd ? ;int |
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91 | dtdy dd ? ;int |
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92 | dtdl_min dd ? ;int |
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93 | dtdl_max dd ? ;int |
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5153 | IgorA | 94 | end if |
95 | if INTERP_STZ eq 1 |
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5175 | IgorA | 96 | sz1 dd ? ;float |
97 | dszdx dd ? ;float |
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98 | dszdy dd ? ;float |
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99 | dszdl_min dd ? ;float |
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100 | dszdl_max dd ? ;float |
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101 | tz1 dd ? ;float |
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102 | dtzdx dd ? ;float |
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103 | dtzdy dd ? ;float |
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104 | dtzdl_min dd ? ;float |
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105 | dtzdl_max dd ? ;float |
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6108 | IgorA | 106 | s_z dd ? ;float |
107 | t_z dd ? ;float |
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5153 | IgorA | 108 | end if |
6113 | IgorA | 109 | if (INTERP_ST eq 1) | (DRAW_LINE_M eq 1) |
5175 | IgorA | 110 | s dd ? ;uint |
111 | t dd ? ;uint |
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6113 | IgorA | 112 | dsdx dd ? ;int |
113 | dtdx dd ? ;int |
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5175 | IgorA | 114 | end if |
5153 | IgorA | 115 | endl |
5187 | IgorA | 116 | pushad |
5153 | IgorA | 117 | |
5175 | IgorA | 118 | ; we sort the vertex with increasing y |
119 | mov ebx,[p0] |
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120 | mov ecx,[p1] |
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121 | mov edx,[p2] |
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5187 | IgorA | 122 | mov eax,[edx+offs_zbup_y] |
123 | cmp [ecx+offs_zbup_y],eax ;(2-1) |
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124 | jle @f |
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125 | xchg edx,ecx |
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5175 | IgorA | 126 | @@: |
127 | mov eax,[ecx+offs_zbup_y] |
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5187 | IgorA | 128 | cmp [ebx+offs_zbup_y],eax ;(1-0) |
129 | jle @f |
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130 | xchg ecx,ebx |
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131 | @@: |
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132 | mov eax,[edx+offs_zbup_y] |
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133 | cmp [ecx+offs_zbup_y],eax ;(2-1) |
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134 | jle @f |
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135 | xchg edx,ecx |
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136 | @@: |
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137 | mov [p0],ebx |
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138 | mov [p1],ecx |
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139 | mov [p2],edx |
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5153 | IgorA | 140 | |
141 | ; we compute dXdx and dXdy for all interpolated values |
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5175 | IgorA | 142 | mov eax,[ecx+offs_zbup_x] |
143 | sub eax,[ebx+offs_zbup_x] |
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144 | mov [fdx1],eax ;p1.x - p0.x |
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145 | mov eax,[ecx+offs_zbup_y] |
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146 | sub eax,[ebx+offs_zbup_y] |
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147 | mov [fdy1],eax ;p1.y - p0.y |
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5153 | IgorA | 148 | |
5175 | IgorA | 149 | mov eax,[edx+offs_zbup_x] |
150 | sub eax,[ebx+offs_zbup_x] |
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151 | mov [fdx2],eax ;p2.x - p0.x |
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152 | mov eax,[edx+offs_zbup_y] |
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153 | sub eax,[ebx+offs_zbup_y] |
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154 | mov [fdy2],eax ;p2.y - p0.y |
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5153 | IgorA | 155 | |
5187 | IgorA | 156 | fild dword[fdx1] |
6141 | IgorA | 157 | fimul dword[fdy2] |
5175 | IgorA | 158 | fild dword[fdx2] |
6141 | IgorA | 159 | fimul dword[fdy1] |
5187 | IgorA | 160 | fsubp ;st0 = st1-st0 |
5175 | IgorA | 161 | fst dword[fz] ;fz = fdx1 * fdy2 - fdx2 * fdy1 |
162 | fldz |
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5187 | IgorA | 163 | fcompp ;if (fz == 0) return |
5175 | IgorA | 164 | fstsw ax |
165 | sahf |
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166 | je .end_f |
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5189 | IgorA | 167 | |
5175 | IgorA | 168 | fld1 |
169 | fdiv dword[fz] ;fz = 1.0 / fz |
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170 | fst dword[fz] ;st0 = fz |
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5153 | IgorA | 171 | |
6141 | IgorA | 172 | fild dword[fdx1] |
5175 | IgorA | 173 | fmul st0,st1 |
174 | fstp dword[fdx1] ;fdx1 *= fz |
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6141 | IgorA | 175 | fild dword[fdy1] |
5175 | IgorA | 176 | fmul st0,st1 |
177 | fstp dword[fdy1] ;fdy1 *= fz |
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6141 | IgorA | 178 | fild dword[fdx2] |
5175 | IgorA | 179 | fmul st0,st1 |
180 | fstp dword[fdx2] ;fdx2 *= fz |
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6141 | IgorA | 181 | fild dword[fdy2] |
182 | fmulp |
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5175 | IgorA | 183 | fstp dword[fdy2] ;fdy2 *= fz |
5153 | IgorA | 184 | |
185 | if INTERP_Z eq 1 |
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5175 | IgorA | 186 | mov eax,[ecx+offs_zbup_z] |
187 | sub eax,[ebx+offs_zbup_z] |
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188 | mov [d1],eax |
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189 | mov eax,[edx+offs_zbup_z] |
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190 | sub eax,[ebx+offs_zbup_z] |
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191 | mov [d2],eax |
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5187 | IgorA | 192 | fild dword[d1] ;d1 = p1.z - p0.z |
193 | fild dword[d2] ;d2 = p2.z - p0.z |
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5175 | IgorA | 194 | |
6141 | IgorA | 195 | ;dzdx = (int) (fdy2*d1 - fdy1*d2) |
196 | ;dzdy = (int) (fdx1*d2 - fdx2*d1) |
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197 | calc_d1d2 fi, dzdx, dzdy |
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5153 | IgorA | 198 | end if |
199 | |||
200 | if INTERP_RGB eq 1 |
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5175 | IgorA | 201 | mov eax,[ecx+offs_zbup_r] |
202 | sub eax,[ebx+offs_zbup_r] |
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203 | mov [d1],eax |
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204 | mov eax,[edx+offs_zbup_r] |
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205 | sub eax,[ebx+offs_zbup_r] |
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206 | mov [d2],eax |
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5187 | IgorA | 207 | fild dword[d1] ;d1 = p1.r - p0.r |
208 | fild dword[d2] ;d2 = p2.r - p0.r |
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5153 | IgorA | 209 | |
6141 | IgorA | 210 | ;drdx = (int) (fdy2*d1 - fdy1*d2) |
211 | ;drdy = (int) (fdx1*d2 - fdx2*d1) |
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212 | calc_d1d2 fi, drdx, drdy |
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5153 | IgorA | 213 | |
5175 | IgorA | 214 | mov eax,[ecx+offs_zbup_g] |
215 | sub eax,[ebx+offs_zbup_g] |
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216 | mov [d1],eax |
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217 | mov eax,[edx+offs_zbup_g] |
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218 | sub eax,[ebx+offs_zbup_g] |
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219 | mov [d2],eax |
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5187 | IgorA | 220 | fild dword[d1] ;d1 = p1.g - p0.g |
221 | fild dword[d2] ;d2 = p2.g - p0.g |
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5153 | IgorA | 222 | |
6141 | IgorA | 223 | ;dgdx = (int) (fdy2*d1 - fdy1*d2) |
224 | ;dgdy = (int) (fdx1*d2 - fdx2*d1) |
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225 | calc_d1d2 fi, dgdx, dgdy |
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5175 | IgorA | 226 | |
227 | mov eax,[ecx+offs_zbup_b] |
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228 | sub eax,[ebx+offs_zbup_b] |
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229 | mov [d1],eax |
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230 | mov eax,[edx+offs_zbup_b] |
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231 | sub eax,[ebx+offs_zbup_b] |
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232 | mov [d2],eax |
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5187 | IgorA | 233 | fild dword[d1] ;d1 = p1.b - p0.b |
234 | fild dword[d2] ;d2 = p2.b - p0.b |
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5175 | IgorA | 235 | |
6141 | IgorA | 236 | ;dbdx = (int) (fdy2*d1 - fdy1*d2) |
237 | ;dbdy = (int) (fdx1*d2 - fdx2*d1) |
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238 | calc_d1d2 fi, dbdx, dbdy |
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5153 | IgorA | 239 | end if |
240 | |||
241 | if INTERP_ST eq 1 |
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5175 | IgorA | 242 | mov eax,[ecx+offs_zbup_s] |
243 | sub eax,[ebx+offs_zbup_s] |
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244 | mov [d1],eax |
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245 | mov eax,[edx+offs_zbup_s] |
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246 | sub eax,[ebx+offs_zbup_s] |
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247 | mov [d2],eax |
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5187 | IgorA | 248 | fild dword[d1] ;d1 = p1.s - p0.s |
249 | fild dword[d2] ;d2 = p2.s - p0.s |
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5153 | IgorA | 250 | |
6141 | IgorA | 251 | ;dsdx = (int) (fdy2*d1 - fdy1*d2) |
252 | ;dsdy = (int) (fdx1*d2 - fdx2*d1) |
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253 | calc_d1d2 fi, dsdx, dsdy |
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5175 | IgorA | 254 | |
255 | mov eax,[ecx+offs_zbup_t] |
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256 | sub eax,[ebx+offs_zbup_t] |
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257 | mov [d1],eax |
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258 | mov eax,[edx+offs_zbup_t] |
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259 | sub eax,[ebx+offs_zbup_t] |
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260 | mov [d2],eax |
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5187 | IgorA | 261 | fild dword[d1] ;d1 = p1.t - p0.t |
262 | fild dword[d2] ;d2 = p2.t - p0.t |
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5175 | IgorA | 263 | |
6141 | IgorA | 264 | ;dtdx = (int) (fdy2*d1 - fdy1*d2) |
265 | ;dtdy = (int) (fdx1*d2 - fdx2*d1) |
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266 | calc_d1d2 fi, dtdx, dtdy |
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5153 | IgorA | 267 | end if |
268 | |||
269 | if INTERP_STZ eq 1 |
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5175 | IgorA | 270 | fild dword[ebx+offs_zbup_z] |
271 | fild dword[ebx+offs_zbup_s] |
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272 | fmul st0,st1 |
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273 | fstp dword[ebx+offs_zbup_sz] ;p0.sz = (float) p0.s * p0.z |
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274 | fild dword[ebx+offs_zbup_t] |
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5187 | IgorA | 275 | fmulp |
5175 | IgorA | 276 | fstp dword[ebx+offs_zbup_tz] ;p0.tz = (float) p0.t * p0.z |
5153 | IgorA | 277 | |
5175 | IgorA | 278 | fild dword[ecx+offs_zbup_z] |
279 | fild dword[ecx+offs_zbup_s] |
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280 | fmul st0,st1 |
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281 | fstp dword[ecx+offs_zbup_sz] ;p1.sz = (float) p1.s * p1.z |
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282 | fild dword[ecx+offs_zbup_t] |
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5187 | IgorA | 283 | fmulp |
5175 | IgorA | 284 | fstp dword[ecx+offs_zbup_tz] ;p1.tz = (float) p1.t * p1.z |
5153 | IgorA | 285 | |
5175 | IgorA | 286 | fild dword[edx+offs_zbup_z] |
287 | fild dword[edx+offs_zbup_s] |
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288 | fmul st0,st1 |
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289 | fstp dword[edx+offs_zbup_sz] ;p2.sz = (float) p2.s * p2.z |
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290 | fild dword[edx+offs_zbup_t] |
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5187 | IgorA | 291 | fmulp |
5175 | IgorA | 292 | fstp dword[edx+offs_zbup_tz] ;p2.tz = (float) p2.t * p2.z |
293 | |||
294 | fld dword[ecx+offs_zbup_sz] |
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5187 | IgorA | 295 | fsub dword[ebx+offs_zbup_sz] ;d1 = p1.sz - p0.sz |
5175 | IgorA | 296 | fld dword[edx+offs_zbup_sz] |
5187 | IgorA | 297 | fsub dword[ebx+offs_zbup_sz] ;d2 = p2.sz - p0.sz |
5175 | IgorA | 298 | |
6141 | IgorA | 299 | ;dszdx = (fdy2*d1 - fdy1*d2) |
300 | ;dszdy = (fdx1*d2 - fdx2*d1) |
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301 | calc_d1d2 f, dszdx, dszdy |
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5175 | IgorA | 302 | |
303 | fld dword[ecx+offs_zbup_tz] |
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5187 | IgorA | 304 | fsub dword[ebx+offs_zbup_tz] ;d1 = p1.tz - p0.tz |
5175 | IgorA | 305 | fld dword[edx+offs_zbup_tz] |
5187 | IgorA | 306 | fsub dword[ebx+offs_zbup_tz] ;d2 = p2.tz - p0.tz |
5175 | IgorA | 307 | |
6141 | IgorA | 308 | ;dtzdx = (fdy2*d1 - fdy1*d2) |
309 | ;dtzdy = (fdx1*d2 - fdx2*d1) |
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310 | calc_d1d2 f, dtzdx, dtzdy |
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5153 | IgorA | 311 | end if |
312 | |||
313 | ; screen coordinates |
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5175 | IgorA | 314 | mov eax,[zb] |
315 | mov edx,[eax+offs_zbuf_linesize] |
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316 | imul edx,[ebx+offs_zbup_y] |
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317 | add edx,[eax+offs_zbuf_pbuf] |
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318 | mov [pp1],edx ;pp1 = zb.pbuf + zb.linesize * p0.y |
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319 | mov edx,[eax+offs_zbuf_xsize] |
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320 | imul edx,[ebx+offs_zbup_y] |
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321 | shl edx,1 |
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322 | add edx,[eax+offs_zbuf_zbuf] |
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323 | mov [pz1],edx ;pz1 = zb.zbuf + zb.xsize * p0.y |
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5153 | IgorA | 324 | |
325 | DRAW_INIT |
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326 | |||
5175 | IgorA | 327 | mov dword[part],0 |
328 | .cycle_0: |
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329 | mov ebx,[p0] |
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330 | mov ecx,[p1] |
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331 | mov edx,[p2] |
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5187 | IgorA | 332 | cmp dword[part],0 ;if (part == 0) |
5175 | IgorA | 333 | jne .els_0 |
334 | mov dword[update_left],1 |
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335 | mov dword[update_right],1 |
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336 | mov [l1],ebx |
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337 | mov [pr1],ebx |
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338 | fldz |
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339 | fld dword[fz] |
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340 | fcompp ;if (fz > 0) |
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341 | fstsw ax |
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342 | sahf |
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343 | jbe .els_1 |
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344 | mov [l2],edx |
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345 | mov [pr2],ecx |
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346 | jmp .end_1 |
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6141 | IgorA | 347 | align 4 |
5175 | IgorA | 348 | .els_1: |
349 | mov [l2],ecx |
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350 | mov [pr2],edx |
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351 | .end_1: |
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352 | mov eax,[ecx+offs_zbup_y] |
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353 | sub eax,[ebx+offs_zbup_y] |
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354 | mov [nb_lines],eax ;nb_lines = p1.y - p0.y |
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355 | jmp .end_0 |
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6141 | IgorA | 356 | align 4 |
5175 | IgorA | 357 | .els_0: |
358 | ; second part |
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359 | fldz |
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360 | fld dword[fz] |
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361 | fcompp ;if (fz > 0) |
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362 | fstsw ax |
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363 | sahf |
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364 | jbe .els_2 |
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5187 | IgorA | 365 | mov dword[update_left],0 |
366 | mov dword[update_right],1 |
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5175 | IgorA | 367 | mov [pr1],ecx |
368 | mov [pr2],edx |
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369 | jmp .end_2 |
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6141 | IgorA | 370 | align 4 |
5175 | IgorA | 371 | .els_2: |
5187 | IgorA | 372 | mov dword[update_left],1 |
373 | mov dword[update_right],0 |
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5175 | IgorA | 374 | mov [l1],ecx |
375 | mov [l2],edx |
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376 | .end_2: |
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377 | mov eax,[edx+offs_zbup_y] |
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378 | sub eax,[ecx+offs_zbup_y] |
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379 | inc eax |
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380 | mov [nb_lines],eax ;nb_lines = p2.y - p1.y + 1 |
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381 | .end_0: |
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5153 | IgorA | 382 | |
383 | ; compute the values for the left edge |
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5175 | IgorA | 384 | cmp dword[update_left],0 ;if (update_left) |
385 | je .end_upd_l |
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386 | mov ebx,[l1] |
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387 | mov ecx,[l2] |
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5187 | IgorA | 388 | mov edx,[ecx+offs_zbup_y] |
389 | sub edx,[ebx+offs_zbup_y] |
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390 | mov [dy1],edx ;dy1 = l2.y - l1.y |
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5175 | IgorA | 391 | mov eax,[ecx+offs_zbup_x] |
392 | sub eax,[ebx+offs_zbup_x] |
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393 | mov [dx1],eax ;dx1 = l2.x - l1.x |
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5187 | IgorA | 394 | cmp edx,0 ;if (dy1 > 0) |
5175 | IgorA | 395 | jle .els_3 |
5187 | IgorA | 396 | xor edx,edx |
397 | cmp eax,0 |
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398 | jl .otr_dx1 |
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5175 | IgorA | 399 | shl eax,16 |
400 | div dword[dy1] ;eax = (dx1 << 16) / dy1 |
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401 | jmp .end_3 |
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6141 | IgorA | 402 | align 4 |
5187 | IgorA | 403 | .otr_dx1: |
404 | neg eax |
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405 | inc eax |
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406 | shl eax,16 |
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407 | div dword[dy1] ;eax = (-dx1 << 16) / dy1 |
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408 | neg eax |
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409 | inc eax |
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410 | jmp .end_3 |
||
6141 | IgorA | 411 | align 4 |
5175 | IgorA | 412 | .els_3: |
413 | xor eax,eax |
||
414 | .end_3: |
||
415 | mov edx,[ebx+offs_zbup_x] |
||
5187 | IgorA | 416 | mov [x1],edx ;x1 = l1.x |
417 | mov dword[error],0 ;error = 0 |
||
5175 | IgorA | 418 | mov dword[derror],eax |
5187 | IgorA | 419 | and dword[derror],0xffff ;derror = eax & 0x0000ffff |
5208 | IgorA | 420 | sar eax,16 |
5187 | IgorA | 421 | mov [dxdy_min],eax ;dxdy_min = eax >> 16 |
5175 | IgorA | 422 | inc eax |
423 | mov [dxdy_max],eax |
||
5153 | IgorA | 424 | |
425 | if INTERP_Z eq 1 |
||
5175 | IgorA | 426 | mov eax,[l1] |
427 | mov eax,[eax+offs_zbup_z] |
||
428 | mov [z1],eax ;z1 = l1.z |
||
429 | mov eax,[dzdx] |
||
430 | imul eax,[dxdy_min] |
||
431 | add eax,[dzdy] |
||
432 | mov [dzdl_min],eax ;dzdl_min = (dzdy +dzdx*dxdy_min) |
||
433 | add eax,[dzdx] |
||
434 | mov [dzdl_max],eax ;dzdl_max = dzdl_min +dzdx |
||
5153 | IgorA | 435 | end if |
436 | if INTERP_RGB eq 1 |
||
5175 | IgorA | 437 | mov ebx,[l1] |
438 | mov eax,[ebx+offs_zbup_r] |
||
439 | mov [r1],eax ;r1 = l1.r |
||
440 | mov eax,[drdx] |
||
441 | imul eax,[dxdy_min] |
||
442 | add eax,[drdy] |
||
443 | mov [drdl_min],eax ;drdl_min = (drdy +drdx*dxdy_min) |
||
444 | add eax,[drdx] |
||
445 | mov [drdl_max],eax ;drdl_max = drdl_min +drdx |
||
5153 | IgorA | 446 | |
5175 | IgorA | 447 | mov eax,[ebx+offs_zbup_g] |
448 | mov [g1],eax ;g1 = l1.g |
||
449 | mov eax,[dgdx] |
||
450 | imul eax,[dxdy_min] |
||
451 | add eax,[dgdy] |
||
452 | mov [dgdl_min],eax ;dgdl_min = (dgdy +dgdx*dxdy_min) |
||
453 | add eax,[dgdx] |
||
454 | mov [dgdl_max],eax ;dgdl_max = dgdl_min +dgdx |
||
5153 | IgorA | 455 | |
5175 | IgorA | 456 | mov eax,[ebx+offs_zbup_b] |
457 | mov [b1],eax ;b1 = l1.b |
||
458 | mov eax,[dbdx] |
||
459 | imul eax,[dxdy_min] |
||
460 | add eax,[dbdy] |
||
461 | mov [dbdl_min],eax ;dbdl_min = (dbdy +dbdx*dxdy_min) |
||
462 | add eax,[dbdx] |
||
463 | mov [dbdl_max],eax ;dbdl_max = dbdl_min +dbdx |
||
5153 | IgorA | 464 | end if |
465 | if INTERP_ST eq 1 |
||
5175 | IgorA | 466 | mov ebx,[l1] |
467 | mov eax,[ebx+offs_zbup_s] |
||
6141 | IgorA | 468 | add eax,0x00200000 ;прокручиваем горизонтальную координату на 0.5 |
5175 | IgorA | 469 | mov [s1],eax ;s1 = l1.s |
470 | mov eax,[dsdx] |
||
471 | imul eax,[dxdy_min] |
||
472 | add eax,[dsdy] |
||
473 | mov [dsdl_min],eax ;dsdl_min = (dsdy +dsdx*dxdy_min) |
||
474 | add eax,[dsdx] |
||
475 | mov [dsdl_max],eax ;dsdl_max = dsdl_min +dsdx |
||
5153 | IgorA | 476 | |
5175 | IgorA | 477 | mov eax,[ebx+offs_zbup_t] |
478 | mov [t1],eax ;t1 = l1.t |
||
479 | mov eax,[dtdx] |
||
480 | imul eax,[dxdy_min] |
||
481 | add eax,[dtdy] |
||
482 | mov [dtdl_min],eax ;dtdl_min = (dtdy +dtdx*dxdy_min) |
||
483 | add eax,[dtdx] |
||
484 | mov [dtdl_max],eax ;dtdl_max = dtdl_min +dtdx |
||
5153 | IgorA | 485 | end if |
486 | if INTERP_STZ eq 1 |
||
5175 | IgorA | 487 | mov ebx,[l1] |
488 | mov eax,[ebx+offs_zbup_sz] |
||
489 | mov [sz1],eax ;sz1 = l1.sz - преобразований нет, потому без сопроцессора |
||
490 | fild dword[dxdy_min] |
||
491 | fmul dword[dszdx] |
||
492 | fadd dword[dszdy] |
||
493 | fst dword[dszdl_min] ;dszdl_min = (dszdy +dszdx*dxdy_min) |
||
494 | fadd dword[dszdx] |
||
495 | fstp dword[dszdl_max] ;dszdl_max = dszdl_min +dszdx |
||
5153 | IgorA | 496 | |
5175 | IgorA | 497 | mov eax,[ebx+offs_zbup_tz] |
498 | mov [tz1],eax ;tz1 = l1.tz - преобразований нет, потому без сопроцессора |
||
499 | fild dword[dxdy_min] |
||
500 | fmul dword[dtzdx] |
||
501 | fadd dword[dtzdy] |
||
502 | fst dword[dtzdl_min] ;dtzdl_min = (dtzdy +dtzdx*dxdy_min) |
||
503 | fadd dword[dtzdx] |
||
504 | fstp dword[dtzdl_max] ;dtzdl_max = dtzdl_min +dtzdx |
||
5153 | IgorA | 505 | end if |
5175 | IgorA | 506 | .end_upd_l: |
5153 | IgorA | 507 | |
5175 | IgorA | 508 | ; compute values for the right edge |
5153 | IgorA | 509 | |
5175 | IgorA | 510 | cmp dword[update_right],0 ;if(update_right) |
511 | je .end_upd_r |
||
512 | mov ebx,[pr1] |
||
513 | mov ecx,[pr2] |
||
5187 | IgorA | 514 | mov edx,[ebx+offs_zbup_x] |
5175 | IgorA | 515 | mov eax,[ecx+offs_zbup_x] |
5187 | IgorA | 516 | sub eax,edx |
517 | ;mov [dx2],eax ;dx2 = pr2.x - pr1.x |
||
518 | shl edx,16 |
||
519 | mov [x2],edx ; x2 = pr1.x << 16 |
||
520 | mov edx,[ecx+offs_zbup_y] |
||
521 | sub edx,[ebx+offs_zbup_y] |
||
522 | mov [dy2],edx ;dy2 = pr2.y - pr1.y |
||
523 | cmp edx,0 ;if (dy2 > 0) |
||
5175 | IgorA | 524 | jle .els_4 |
5187 | IgorA | 525 | xor edx,edx |
526 | cmp eax,0 |
||
527 | jl .otr_dx2 |
||
5175 | IgorA | 528 | shl eax,16 |
529 | div dword[dy2] ;eax = (dx2 << 16) / dy2 |
||
530 | jmp .end_4 |
||
6141 | IgorA | 531 | align 4 |
5187 | IgorA | 532 | .otr_dx2: |
533 | neg eax |
||
534 | inc eax ;dx2 *= -1 |
||
535 | shl eax,16 |
||
536 | div dword[dy2] ;eax = (-dx2 << 16) / dy2 |
||
537 | neg eax |
||
538 | inc eax |
||
539 | jmp .end_4 |
||
6141 | IgorA | 540 | align 4 |
5175 | IgorA | 541 | .els_4: |
542 | xor eax,eax |
||
543 | .end_4: |
||
544 | mov [dx2dy2],eax |
||
545 | .end_upd_r: |
||
5153 | IgorA | 546 | |
5175 | IgorA | 547 | ; we draw all the scan line of the part |
5187 | IgorA | 548 | if DEBUG ;[nb_lines] |
549 | push ecx edi |
||
550 | mov eax,[nb_lines] |
||
551 | mov ecx,80 |
||
552 | lea edi,[buf_param] |
||
553 | stdcall convert_int_to_str,ecx |
||
5153 | IgorA | 554 | |
5187 | IgorA | 555 | stdcall str_n_cat,edi,txt_nl,2 |
556 | stdcall dbg_print,f_fill_tr_nl,buf_param |
||
557 | pop edi ecx |
||
558 | end if |
||
559 | |||
5175 | IgorA | 560 | .beg_w_lin: |
561 | cmp dword[nb_lines],0 ;while (nb_lines>0) |
||
562 | jle .end_w_lin |
||
563 | dec dword[nb_lines] |
||
564 | if DRAW_LINE_M eq 1 |
||
6113 | IgorA | 565 | DRAW_LINE |
5175 | IgorA | 566 | else |
567 | ; generic draw line |
||
568 | mov eax,[x2] |
||
5208 | IgorA | 569 | sar eax,16 |
5175 | IgorA | 570 | mov edi,[x1] |
571 | sub eax,edi |
||
572 | mov [n],eax ;n = (x2 >> 16) - x1 |
||
573 | imul edi,PSZB |
||
574 | add edi,[pp1] ;pp = pp1 + x1 * PSZB |
||
5187 | IgorA | 575 | |
5153 | IgorA | 576 | if INTERP_Z eq 1 |
6126 | IgorA | 577 | mov esi,[x1] |
578 | shl esi,1 |
||
579 | add esi,[pz1] |
||
5175 | IgorA | 580 | mov eax,[z1] |
581 | mov [z],eax |
||
5153 | IgorA | 582 | end if |
583 | if INTERP_RGB eq 1 |
||
5175 | IgorA | 584 | mov eax,[r1] |
5922 | IgorA | 585 | bt eax,31 ; коректирование испорченных пикселей (в начале линии) |
586 | jnc @f |
||
587 | xor eax,eax |
||
588 | @@: |
||
589 | bt eax,16 |
||
590 | jnc @f |
||
591 | mov eax,0xff00 |
||
592 | @@: |
||
5175 | IgorA | 593 | mov [or1],eax |
594 | mov eax,[g1] |
||
5922 | IgorA | 595 | bt eax,31 |
596 | jnc @f |
||
597 | xor eax,eax |
||
598 | @@: |
||
599 | bt eax,16 |
||
600 | jnc @f |
||
601 | mov eax,0xff00 |
||
602 | @@: |
||
5175 | IgorA | 603 | mov [og1],eax |
604 | mov eax,[b1] |
||
5922 | IgorA | 605 | bt eax,31 |
606 | jnc @f |
||
607 | xor eax,eax |
||
608 | @@: |
||
609 | bt eax,16 |
||
610 | jnc @f |
||
611 | mov eax,0xff00 |
||
612 | @@: |
||
5175 | IgorA | 613 | mov [ob1],eax |
5153 | IgorA | 614 | end if |
615 | if INTERP_ST eq 1 |
||
5175 | IgorA | 616 | mov eax,[s1] |
617 | mov [s],eax |
||
618 | mov eax,[t1] |
||
619 | mov [t],eax |
||
5153 | IgorA | 620 | end if |
621 | if INTERP_STZ eq 1 |
||
5175 | IgorA | 622 | mov eax,[sz1] |
623 | mov [s_z],eax |
||
624 | mov eax,[tz1] |
||
625 | mov [t_z],eax |
||
5153 | IgorA | 626 | end if |
5187 | IgorA | 627 | |
628 | align 4 |
||
5175 | IgorA | 629 | .cycle_1: ;while (n>=3) |
5922 | IgorA | 630 | if INTERP_RGB eq 1 |
631 | cmp dword[n],5 |
||
632 | jl .cycle_2 |
||
633 | else |
||
5187 | IgorA | 634 | cmp dword[n],3 |
635 | jl .cycle_2 |
||
5922 | IgorA | 636 | end if |
5175 | IgorA | 637 | PUT_PIXEL 0 |
638 | PUT_PIXEL 1 |
||
639 | PUT_PIXEL 2 |
||
640 | PUT_PIXEL 3 |
||
5153 | IgorA | 641 | if INTERP_Z eq 1 |
6126 | IgorA | 642 | add esi,8 ;=4*sizeof(uint) |
5153 | IgorA | 643 | end if |
5175 | IgorA | 644 | add edi,4*PSZB |
645 | sub dword[n],4 |
||
5187 | IgorA | 646 | jmp .cycle_1 |
6141 | IgorA | 647 | align 4 |
5175 | IgorA | 648 | .cycle_2: ;while (n>=0) |
5939 | IgorA | 649 | cmp dword[n],0 |
650 | jl .cycle_2_end |
||
5922 | IgorA | 651 | if INTERP_RGB eq 1 |
652 | ; коректирование испорченных пикселей (в конце линии) |
||
653 | bt dword[or1],31 |
||
654 | jnc @f |
||
655 | mov dword[or1],0 |
||
656 | jmp .end_r |
||
6141 | IgorA | 657 | align 4 |
5922 | IgorA | 658 | @@: |
659 | bt dword[or1],16 |
||
660 | jnc .end_r |
||
661 | mov dword[or1],0xff00 |
||
662 | .end_r: |
||
663 | bt dword[og1],31 |
||
664 | jnc @f |
||
665 | mov dword[og1],0 |
||
666 | jmp .end_g |
||
6141 | IgorA | 667 | align 4 |
5922 | IgorA | 668 | @@: |
669 | bt dword[og1],16 |
||
670 | jnc .end_g |
||
671 | mov dword[og1],0xff00 |
||
672 | .end_g: |
||
673 | bt dword[ob1],31 |
||
674 | jnc @f |
||
675 | mov dword[ob1],0 |
||
676 | jmp .end_b |
||
6141 | IgorA | 677 | align 4 |
5922 | IgorA | 678 | @@: |
679 | bt dword[ob1],16 |
||
680 | jnc .end_b |
||
681 | mov dword[ob1],0xff00 |
||
682 | .end_b: |
||
683 | end if |
||
5175 | IgorA | 684 | PUT_PIXEL 0 |
5153 | IgorA | 685 | if INTERP_Z eq 1 |
6126 | IgorA | 686 | add esi,2 ;=sizeof(uint) |
5153 | IgorA | 687 | end if |
5175 | IgorA | 688 | add edi,PSZB |
689 | dec dword[n] |
||
5187 | IgorA | 690 | jmp .cycle_2 |
6141 | IgorA | 691 | align 4 |
5187 | IgorA | 692 | .cycle_2_end: |
693 | end if ;проверка от макроса DRAW_LINE |
||
5175 | IgorA | 694 | |
695 | ; left edge |
||
696 | mov eax,[derror] |
||
697 | add [error],eax |
||
5187 | IgorA | 698 | cmp dword[error],0 ;if (error > 0) |
5175 | IgorA | 699 | jle .els_er |
700 | sub dword[error],0x10000 |
||
701 | mov eax,[dxdy_max] |
||
702 | add [x1],eax |
||
5153 | IgorA | 703 | if INTERP_Z eq 1 |
5175 | IgorA | 704 | mov eax,[dzdl_max] |
705 | add [z1],eax |
||
5153 | IgorA | 706 | end if |
707 | if INTERP_RGB eq 1 |
||
5175 | IgorA | 708 | mov eax,[drdl_max] |
709 | add [r1],eax |
||
710 | mov eax,[dgdl_max] |
||
711 | add [g1],eax |
||
712 | mov eax,[dbdl_max] |
||
713 | add [b1],eax |
||
5153 | IgorA | 714 | end if |
715 | if INTERP_ST eq 1 |
||
5175 | IgorA | 716 | mov eax,[dsdl_max] |
717 | add [s1],eax |
||
718 | mov eax,[dtdl_max] |
||
719 | add [t1],eax |
||
5153 | IgorA | 720 | end if |
721 | if INTERP_STZ eq 1 |
||
5175 | IgorA | 722 | fld dword[dszdl_max] |
723 | fadd dword[sz1] |
||
724 | fstp dword[sz1] |
||
725 | fld dword[dtzdl_max] |
||
726 | fadd dword[tz1] |
||
727 | fstp dword[tz1] |
||
5153 | IgorA | 728 | end if |
5175 | IgorA | 729 | jmp .end_er |
6141 | IgorA | 730 | align 4 |
5175 | IgorA | 731 | .els_er: |
732 | mov eax,[dxdy_min] |
||
733 | add [x1],eax |
||
5153 | IgorA | 734 | if INTERP_Z eq 1 |
5175 | IgorA | 735 | mov eax,[dzdl_min] |
736 | add [z1],eax |
||
5153 | IgorA | 737 | end if |
738 | if INTERP_RGB eq 1 |
||
5175 | IgorA | 739 | mov eax,[drdl_min] |
740 | add [r1],eax |
||
741 | mov eax,[dgdl_min] |
||
742 | add [g1],eax |
||
743 | mov eax,[dbdl_min] |
||
744 | add [b1],eax |
||
5153 | IgorA | 745 | end if |
746 | if INTERP_ST eq 1 |
||
5175 | IgorA | 747 | mov eax,[dsdl_min] |
748 | add [s1],eax |
||
749 | mov eax,[dtdl_min] |
||
750 | add [t1],eax |
||
5153 | IgorA | 751 | end if |
752 | if INTERP_STZ eq 1 |
||
5175 | IgorA | 753 | fld dword[dszdl_min] |
754 | fadd dword[sz1] |
||
755 | fstp dword[sz1] |
||
756 | fld dword[dtzdl_min] |
||
757 | fadd dword[tz1] |
||
758 | fstp dword[tz1] |
||
5153 | IgorA | 759 | end if |
5175 | IgorA | 760 | .end_er: |
761 | ; right edge |
||
762 | mov eax,[dx2dy2] |
||
763 | add [x2],eax |
||
764 | |||
765 | ; screen coordinates |
||
766 | mov ebx,[zb] |
||
767 | mov eax,[ebx+offs_zbuf_linesize] |
||
768 | add [pp1],eax |
||
769 | mov eax,[ebx+offs_zbuf_xsize] |
||
770 | shl eax,1 |
||
771 | add [pz1],eax |
||
772 | jmp .beg_w_lin |
||
6141 | IgorA | 773 | align 4 |
5175 | IgorA | 774 | .end_w_lin: |
775 | inc dword[part] |
||
776 | cmp dword[part],2 |
||
777 | jl .cycle_0 |
||
778 | .end_f: |
||
5187 | IgorA | 779 | popad |
5175 | IgorA | 780 | ret |
781 | endp |
||
782 | |||
5153 | IgorA | 783 | restore INTERP_Z |
784 | restore INTERP_RGB |
||
785 | restore INTERP_ST |
||
786 | restore INTERP_STZ |
||
5175 | IgorA | 787 | restore DRAW_LINE_M |
5153 | IgorA | 788 | |
789 | purge DRAW_INIT |
||
5175 | IgorA | 790 | purge DRAW_LINE |
5153 | IgorA | 791 | purge PUT_PIXEL><>><>><>><>><>> |