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1 | ha | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; VGA.INC ;; |
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4 | ;; ;; |
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5 | ;; 640x480 mode 0x12 VGA functions for MenuetOS ;; |
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6 | ;; ;; |
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7 | ;; Paul Butcher, paul.butcher@asa.co.uk ;; |
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8 | ;; ;; |
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9 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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10 | |||
11 | |||
12 | |||
13 | paletteVGA: |
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14 | |||
15 | ;16 colour palette |
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16 | mov dx,0x3c8 |
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17 | mov al,0 |
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18 | out dx,al |
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19 | |||
20 | mov ecx,16 |
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21 | mov dx,0x3c9 |
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22 | xor eax,eax |
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23 | |||
24 | palvganew: |
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25 | |||
26 | mov al,0 |
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27 | test ah,4 |
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28 | jz palvgalbl1 |
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29 | add al,31 |
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30 | test ah,8 |
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31 | jz palvgalbl1 |
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32 | add al,32 |
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33 | palvgalbl1: |
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34 | out dx,al ; red 0,31 or 63 |
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35 | mov al,0 |
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36 | test ah,2 |
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37 | jz palvgalbl2 |
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38 | add al,31 |
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39 | test ah,8 |
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40 | jz palvgalbl2 |
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41 | add al,32 |
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42 | palvgalbl2: |
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43 | out dx,al ; blue 0,31 or 63 |
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44 | mov al,0 |
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45 | test ah,1 |
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46 | jz palvgalbl3 |
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47 | add al,31 |
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48 | test ah,8 |
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49 | jz palvgalbl3 |
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50 | add al,32 |
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51 | palvgalbl3: |
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52 | out dx,al ; green 0,31 or 63 |
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53 | add ah,1 |
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54 | loop palvganew |
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55 | |||
56 | ret |
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57 | |||
58 | |||
59 | vga_putimage: |
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60 | |||
61 | push ebp ; |
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62 | push esi ; |
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63 | push edi ; |
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64 | |||
65 | push eax ; |
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66 | push ebx ; +8 [ptrImage] |
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67 | push ecx ; +4 [BH] |
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68 | push edx ; +0 [xy] |
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69 | |||
70 | movzx eax,word [esp+2] ; eax:=x |
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71 | movzx ebx,word [esp+0] ; ebx:=y |
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72 | mov ecx,[0x3010] ; |
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73 | add eax,[ecx-twdw] ; eax+=Xwin |
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74 | add ebx,[ecx-twdw+4] ; ebx+=Ywin |
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75 | mov ecx,ebx ; ecx = y+Ywin |
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76 | mov edx,eax ; edx = x+Xwin |
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77 | |||
78 | imul ebx, 640*4 ; (y+Ywin)*BytesPerScanLine |
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79 | shl eax,2 ; (x+Xwin)*BytesPerPixel |
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80 | add eax,ebx ; |
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81 | mov edi,eax ; store copy |
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82 | add eax,[0xfe80] ; +AddrLFB |
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83 | ;entry point in LFB >> EAX:=(y+Ywin)*BytesPerScanLine+X*BytesPerPixel+AddrLFB |
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84 | |||
85 | shr edi,5 ; change from 4 to 1/8 BytesPerPixel |
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86 | add edi,0xa0000 ; + VGABasePtr |
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87 | ;VGA start address >> EDI:=(y+Ywin)*BytesPerScanLine+X*BytesPerPixel+AddrVGA |
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88 | |||
89 | mov ebx, [0xfe00] ; ScreenXSize |
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90 | inc ebx ; +1 |
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91 | imul ebx,ecx ; *(y+Ywin) |
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92 | mov ebp, ebx ; |
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93 | add ebp, edx ; +(x+Xwin) |
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94 | add ebp, WinMapAddress ; ebp:=(y+Ywin)*(ScreenXSize+1)+(x+Xwin)+AddrBuffer |
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95 | |||
96 | mov esi,[esp+8] ; esi:=AddrImg |
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97 | movzx ecx,word [esp+6] ; ecx:=B |
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98 | movzx ebx,word [esp+4] ; ebx:=H |
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99 | |||
100 | ; check limits while draw ? |
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101 | |||
102 | push ecx ; B |
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103 | push eax ; LFB address |
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104 | |||
105 | mov eax,[0x3010] |
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106 | mov ecx,[eax+draw_data-0x3000+0] |
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107 | cmp ecx,0 |
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108 | jnz dbcblimitlset_vga |
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109 | |||
110 | mov ecx,[eax+draw_data-0x3000+4] |
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111 | cmp ecx,0 |
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112 | jnz dbcblimitlset_vga |
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113 | |||
114 | mov ecx,[eax+draw_data-0x3000+8] |
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115 | cmp ecx,[0xfe00] ; ecx <> Screen X size |
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116 | jnz dbcblimitlset_vga |
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117 | |||
118 | mov ecx,[eax+draw_data-0x3000+12] |
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119 | cmp ecx,[0xfe04] ; ecx <> Screen Y size |
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120 | jnz dbcblimitlset_vga |
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121 | |||
122 | pop eax ; LFB address |
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123 | pop ecx ; B |
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124 | |||
125 | push dword 0 |
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126 | |||
127 | jmp pimvga |
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128 | |||
129 | dbcblimitlset_vga: |
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130 | |||
131 | pop eax ; LFB address |
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132 | pop ecx ; B |
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133 | |||
134 | push dword 1 |
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135 | |||
136 | pimvga: |
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137 | push edi |
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138 | push esi |
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139 | push eax ; LFB address |
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140 | push ecx ; B |
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141 | push ebx ; H |
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142 | push edx ; x+Xwin |
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143 | |||
144 | mov ebx,[0x3010] |
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145 | mov bl,[ebx+0xe] |
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146 | mov bh,[esp+6*4] |
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147 | |||
148 | cld |
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149 | |||
150 | npvga: |
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151 | |||
152 | cmp bl,[ds:ebp] |
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153 | jnz impvgano |
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154 | |||
155 | ; cmp bh,0 |
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156 | ; jz impvgayes |
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157 | |||
158 | ; call voodoodbcplimit |
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159 | ; jnz impvgano |
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160 | |||
161 | ; impvgayes: |
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162 | |||
163 | push eax ; LFB address |
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164 | push ebx ; app no. |
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165 | push ecx ; B |
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166 | push edx ; x+Xwin |
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167 | |||
168 | mov edx,[esi] ; color |
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169 | mov [eax],dx |
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170 | shr edx,16 |
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171 | mov [eax+2],dl |
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172 | |||
173 | mov eax,[esi] ; color |
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174 | mov ecx,[esp] ; x+Xwin |
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175 | and ecx,0x07 ; modulo 8 |
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176 | call setvgapixel ; eax=color, ecx=x%8, edi=VGA address |
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177 | |||
178 | pop edx |
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179 | pop ecx |
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180 | pop ebx |
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181 | pop eax |
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182 | |||
183 | impvgano: |
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184 | |||
185 | add esi,3 ; esi+=3 ptrImage+=3 |
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186 | add eax,4 ; eax+=4 LFBaddr +=4 |
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187 | inc ebp |
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188 | inc edx ; x+Xwin+n |
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189 | |||
190 | test edx,0x07 ; test modulo 8 |
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191 | jnz impvgacont |
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192 | inc edi |
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193 | |||
194 | impvgacont: |
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195 | dec ecx ; B-- |
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196 | jnz npvga |
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197 | |||
198 | pop edx |
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199 | pop ebx |
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200 | pop ecx |
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201 | pop eax |
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202 | pop esi |
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203 | pop edi |
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204 | |||
205 | add edi,640/8 ; add one VGA line |
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206 | add eax,640*4 ; add one LFB line |
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207 | |||
208 | sub ebp, ecx ; -B |
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209 | add ebp, [0xfe00] ; |
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210 | inc ebp ; ptrBuffer:=ptrBuffer-B+Screen_Xsize+1 |
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211 | |||
212 | push ecx |
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213 | lea ecx,[ecx+ecx*2] ; |
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214 | add esi,ecx ; ptrImage:=ptrImage+B*3 |
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215 | pop ecx |
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216 | |||
217 | dec ebx ; H-- |
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218 | jnz near pimvga |
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219 | |||
220 | add esp,4 ; jump saved limit byte |
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221 | pop edx |
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222 | pop ecx |
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223 | pop ebx |
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224 | pop eax |
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225 | pop edi |
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226 | pop esi |
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227 | pop ebp |
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228 | |||
229 | ret |
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230 | |||
231 | |||
232 | VGA_putpixel: |
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233 | |||
234 | ; eax = x |
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235 | ; ebx = y |
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236 | |||
237 | mov ecx,eax |
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238 | mov eax, [esp+32-8+4] ; color |
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239 | |||
240 | imul ebx, 640*4 ; y*BytesPerLine (Vesa2.0 32) |
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241 | lea edx, [ebx+ecx*4] ; + x*BytesPerPixel (Vesa2.0 32) |
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242 | |||
243 | mov edi,edx |
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244 | add edi, [0xfe80] ; + LFB address |
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245 | mov [edi], eax ; write to LFB for Vesa2.0 |
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246 | |||
247 | shr edx,5 ; change BytesPerPixel to 1/8 |
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248 | mov edi,edx |
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249 | add edi, 0x0a0000 ; address of pixel in VGA area |
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250 | |||
251 | and ecx,0x07 ; bit no. (modulo 8) |
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252 | |||
253 | setvgapixel: |
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254 | |||
255 | ; edi = address, eax = 24bit colour, ecx = bit no. (modulo 8) |
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256 | |||
257 | push eax |
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258 | mov ebx,eax ; color |
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259 | |||
260 | ;mov al,0x08 |
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261 | ;mov dx,0x03ce |
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262 | ;out dx,al ; select GDC bit mask register |
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263 | |||
264 | inc cl |
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265 | mov ax, 0x100 |
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266 | shr ax,cl |
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267 | mov dx,0x03cf |
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268 | out dx,al ; set bit mask for pixel |
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269 | |||
270 | mov dl,0 |
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271 | mov eax,ebx |
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272 | and eax,0x000000ff ; blue |
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273 | cmp eax,85 |
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274 | jle p13green |
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275 | or dl,0x01 |
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276 | cmp eax,170 |
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277 | jle p13green |
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278 | or dl,0x08 |
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279 | |||
280 | p13green: |
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281 | and ebx,0x0000ff00 ; green |
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282 | cmp ebx,85*256 |
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283 | jle p13red |
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284 | or dl,0x02 |
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285 | cmp ebx,170*256 |
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286 | jle p13red |
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287 | or dl,0x08 |
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288 | |||
289 | p13red: |
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290 | pop ebx |
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291 | and ebx,0x00ff0000 ; red |
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292 | cmp ebx,85*256*256 |
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293 | jle p13cont |
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294 | or dl,0x04 |
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295 | cmp ebx,170*256*256 |
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296 | jle p13cont |
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297 | or dl,0x08 |
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298 | |||
299 | p13cont: |
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300 | mov al,[edi] ; dummy read |
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301 | mov [edi],dl |
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302 | |||
303 | ret |
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304 | |||
305 | |||
306 | vga_drawbar: |
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307 | |||
308 | sub edx,ebx ; edx:=Yend-Ystart=H |
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309 | sub ecx,eax ; ecx:=Xend-Xstat=B |
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310 | |||
311 | push ebp ; +24 |
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312 | push esi ; +20 |
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313 | push edi ; +16 |
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314 | push eax ; +12 |
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315 | push ebx ; +8 |
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316 | push ecx ; +4 |
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317 | push edx ; +0 |
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318 | |||
319 | mov ecx,[0x3010] ; |
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320 | add eax,[ecx-twdw] ; eax:=Xwin+x |
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321 | add ebx,[ecx-twdw+4] ; ebx:=Ywin+y |
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322 | mov ecx, eax ; ecx:=(x+Xwin) |
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323 | mov edx, ebx ; edx:=(y+Ywin) |
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324 | |||
325 | imul ebx, 640/8 ; |
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326 | mov edi, ebx ; edi:=BytesPerScanLine*(y+Ywin) |
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327 | shr eax, 3 ; |
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328 | add edi, eax ; + (x+Xwin)*BytesPerPixel |
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329 | add edi,0xa0000 ; + VGAbaseaddress |
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330 | |||
331 | mov eax, [0xfe00] ; ScreenXSize |
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332 | inc eax ; +1 |
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333 | imul eax,edx ; *(y+Ywin) |
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334 | mov ebp, eax ; |
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335 | add ebp, ecx ; +(x+Win) |
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336 | add ebp, WinMapAddress ; +AddrBuffer |
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337 | |||
338 | mov eax, [0xfe08] ; BytesPerScanLine - LFB |
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339 | mul edx ; *(y+Ywin) |
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340 | mov esi,eax |
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341 | add esi,ecx |
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342 | add esi,ecx |
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343 | add esi,ecx |
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344 | add esi,ecx ; + 4*(x+Xwin) |
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345 | add esi,[0xfe80] ; +AddrLFB |
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346 | |||
347 | ; edi:=(y+Ywin)*BytesPerScanLine+X*BytesPerPixel + AddrVGA |
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348 | ; esi:=(y+Ywin)*BytesPerScanLine+X*BytesPerPixel + AddrLFB |
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349 | ; ebp:=(y+Ywin)*(ScreenXSize+1)+(x+Xwin)+AddrBuffer |
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350 | |||
351 | ; x size |
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352 | |||
353 | mov eax,[esp+4] ; B [esp+4] |
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354 | mov ebx,[esp+0] ; H |
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355 | |||
356 | mov edx,[esp+16] ; color |
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357 | test edx,0x80000000 |
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358 | jz nodbglvga |
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359 | |||
360 | ; no color glide for VGA - set to half glide |
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361 | shr ebx,1 ; H/2 |
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362 | sub edx,ebx |
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363 | mov [esp+16],edx |
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364 | mov ebx,[esp+0] ; reset to H |
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365 | |||
366 | nodbglvga: |
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367 | ; check limits ? |
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368 | |||
369 | push eax |
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370 | push ecx |
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371 | |||
372 | mov eax,[0x3010] |
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373 | |||
374 | mov ecx,[eax+draw_data-0x3000+0] |
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375 | cmp ecx,0 |
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376 | jnz dbcblimitlset_vga2 |
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377 | |||
378 | mov ecx,[eax+draw_data-0x3000+4] |
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379 | cmp ecx,0 |
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380 | jnz dbcblimitlset_vga2 |
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381 | |||
382 | mov ecx,[eax+draw_data-0x3000+8] |
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383 | cmp ecx,[0xfe00] |
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384 | jnz dbcblimitlset_vga2 |
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385 | |||
386 | mov ecx,[eax+draw_data-0x3000+12] |
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387 | cmp ecx,[0xfe04] |
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388 | jnz dbcblimitlset_vga2 |
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389 | |||
390 | pop ecx |
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391 | pop eax |
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392 | |||
393 | push dword 0 |
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394 | |||
395 | jmp dbnewpivga |
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396 | |||
397 | dbcblimitlset_vga2: |
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398 | |||
399 | pop ecx ; x+Xwin |
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400 | pop eax ; B |
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401 | |||
402 | push dword 1 |
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403 | |||
404 | dbnewpivga: |
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405 | |||
406 | push eax; B |
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407 | push ebx ; H |
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408 | push edi |
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409 | push esi |
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410 | push ecx ; x+Xwin |
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411 | |||
412 | mov ebx,[0x3010] |
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413 | movzx ebx,byte[ebx+0xe] |
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414 | |||
415 | cld |
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416 | |||
417 | dbnpvga: |
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418 | |||
419 | mov dl,[ds:ebp] |
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420 | |||
421 | cmp dl,bl |
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422 | jnz dbimpvgano |
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423 | |||
424 | ; mov edx,[esp+5*4] ; check limit? |
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425 | ; cmp edx,0 |
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426 | ; jz dbimpvgayes |
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427 | |||
428 | ; call voodoodbcplimit |
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429 | ; jnz dbimpvgano |
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430 | |||
431 | ; dbimpvgayes: |
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432 | |||
433 | push eax ; B |
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434 | push ebx |
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435 | push ecx ; x+Xwin |
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436 | |||
437 | mov eax,[esp+12+20+16+4] ; color |
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438 | mov ebx,eax |
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439 | |||
440 | mov [esi],bx ; write LFB pixel |
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441 | shr ebx,16 |
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442 | mov [esi+2],bl |
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443 | |||
444 | and ecx,0x07 ; modulo 8 |
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445 | call setvgapixel ; eax=color, ecx=x%8, edi=VGA address |
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446 | |||
447 | pop ecx |
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448 | pop ebx |
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449 | pop eax |
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450 | |||
451 | dbimpvgano: |
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452 | |||
453 | add esi,4 ; ptrLFB+=4 |
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454 | inc ebp ; address buffer |
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455 | inc ecx ; x posn++ |
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456 | test ecx,0x07 ; test modulo 8 |
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457 | jnz dbvgacont |
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458 | inc edi ; VGA screen ptr++ |
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459 | |||
460 | dbvgacont: |
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461 | dec eax ; B-- NB ecx in Vesa20 fn? |
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462 | jnz dbnpvga |
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463 | |||
464 | dbnpvgad: |
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465 | |||
466 | pop ecx |
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467 | pop esi |
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468 | pop edi |
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469 | pop ebx |
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470 | pop eax |
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471 | |||
472 | add esi,[0xfe08] ; ptrLFB+=BytesPerScanLine |
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473 | add edi,640/8 ; ptrScreen+=BytesPerScanLine |
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474 | |||
475 | add ebp,[0xfe00] ; |
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476 | sub ebp, eax ; was ecx in vesa20 fn? |
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477 | inc ebp ; ptrBuffer:=ptrBuffer-B+BytesPerLine+1 |
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478 | |||
479 | dec ebx ; H-- |
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480 | jz nodbnewpivga ; H<>0 |
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481 | |||
482 | jmp dbnewpivga |
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483 | |||
484 | nodbnewpivga: |
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485 | |||
486 | add esp,7*4 ; NB includes limit check flag |
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487 | ;pop ebx |
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488 | ;pop eax |
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489 | ;pop edi |
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490 | ;pop esi |
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491 | pop ebp |
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492 | |||
493 | ;pop edx |
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494 | ;pop ecx |
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495 | |||
496 | ret |
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497 | |||
498 | |||
499 | vga_drawbackground_tiled: |
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500 | |||
501 | push ebp |
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502 | push eax |
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503 | push ebx |
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504 | push ecx |
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505 | push edx |
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506 | |||
507 | mov edx,dword [0x400000-8] ; B |
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508 | add edx,dword [WinMapAddress-8] ; +B |
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509 | add edx,dword [WinMapAddress-8] ; +B |
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510 | push edx |
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511 | |||
512 | mov eax,[draw_data+32+0] ; x start:=(x+Xwin) |
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513 | mov ebx,[draw_data+32+4] ; y start:=(y+Ywin) |
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514 | mov ecx,eax |
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515 | mov edx,ebx |
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516 | |||
517 | imul edx, 640*4 ; (y+Ywin)*BytesPerScanLine |
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518 | shl ecx,2 ; (x+Xwin)*BytesPerPixel |
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519 | add ecx,edx ; |
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520 | mov ebp,ecx ; store copy |
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521 | add ecx,[0xfe80] ; +AddrLFB |
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522 | ;entry point in LFB >> ECX:=(y+Ywin)*BytesPerScanLine+X*BytesPerPixel+Addr |
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523 | |||
524 | shr ebp,5 ; change from 4 to 1/8 BytesPerPixel |
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525 | add ebp,0xa0000 ; + VGABasePtr |
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526 | ;VGA start address >> EBP:=(y+Ywin)*BytesPerScanLine+X*BytesPerPixel+AddrV |
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527 | |||
528 | |||
529 | call calculate_edi |
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530 | |||
531 | dp3vga: ; MAIN LOOP |
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532 | |||
533 | cmp [edi+WinMapAddress],byte 1 ; ptrBuffer^<>byte(1) |
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534 | je ybgpvga |
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535 | |||
536 | jmp nbgpvga |
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537 | |||
538 | ybgpvga: |
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539 | |||
540 | push eax ; x |
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541 | push ebx ; y |
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542 | push ecx ; LFB address |
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543 | |||
544 | mov ecx,dword [WinMapAddress-8] ; B |
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545 | xor edx,edx ; edx:=0 |
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546 | div ecx ; Xstart/B |
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547 | |||
548 | ; eax=Int(qn) edx:=Rem |
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549 | |||
550 | lea esi,[edx+edx*2] ; esi:=edx*3 |
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551 | |||
552 | mov ecx,dword [WinMapAddress-4] ; ecx:=H |
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553 | mov eax,[esp+4] ; eax:=Ystart |
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554 | xor edx,edx ; |
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555 | div ecx ; Ystart/H |
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556 | |||
557 | mov eax,edx ; eax:=Rem |
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558 | xor edx,edx ; |
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559 | mov ebx,[esp+12] ; ebx:=B*3 |
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560 | mul ebx ; |
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561 | add esi,eax ; |
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562 | |||
563 | mov eax,[esi+0x300000] ; color |
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564 | and eax,0xffffff |
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565 | |||
566 | mov ecx, [esp] ; LFB address |
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567 | mov ebx,eax ; copy color |
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568 | mov [ecx],bx |
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569 | shr ebx,16 |
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570 | mov [ecx+2],bl |
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571 | |||
572 | xchg edi, ebp |
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573 | mov ecx,[esp+8] ; x position |
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574 | and ecx,0x07 ; x modulo 8 |
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575 | call setvgapixel ; eax=color, ecx=x%8, edi=VGA address |
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576 | xchg ebp, edi |
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577 | |||
578 | pop ecx |
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579 | pop ebx |
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580 | pop eax |
||
581 | |||
582 | nbgpvga: |
||
583 | |||
584 | inc eax ; x++ |
||
585 | cmp eax,[draw_data+32+8] ; X > xend? |
||
586 | jg nodp3vga |
||
587 | |||
588 | test eax,0x07 ; x test modulo 8 |
||
589 | jnz hook1vga |
||
590 | inc ebp ; VGA address++ |
||
591 | |||
592 | hook1vga: |
||
593 | add ecx,4 ; LFB address += 4 |
||
594 | inc edi ; ptrBuffer++ |
||
595 | add esi,3 ; ptrImage+=3 |
||
596 | jmp dp3vga |
||
597 | |||
598 | nodp3vga: |
||
599 | |||
600 | mov eax,[draw_data+32+0] ; x+Xwin |
||
601 | inc ebx ; y position |
||
602 | mov ecx,eax |
||
603 | mov edx,ebx |
||
604 | |||
605 | imul edx, 640*4 ; (y+Ywin)*BytesPerScanLine |
||
606 | shl ecx,2 ; (x+Xwin)*BytesPerPixel |
||
607 | add ecx,edx ; |
||
608 | mov ebp,ecx ; store copy |
||
609 | add ecx,[0xfe80] ; +AddrLFB |
||
610 | ;entry point in LFB >> ECX:=(y+Ywin)*BytesPerScanLine+X*BytesPerPixel+Addr |
||
611 | |||
612 | |||
613 | shr ebp,5 ; change from 4 to 1/8 BytesPerPixel |
||
614 | add ebp,0xa0000 ; + VGABasePtr |
||
615 | ;VGA start address >> EBP:=(y+Ywin)*BytesPerScanLine+X*BytesPerPixel+AddrV |
||
616 | |||
617 | |||
618 | call calculate_edi |
||
619 | |||
620 | cmp ebx,[draw_data+32+12] ; Y > yend |
||
621 | jg dp4vga |
||
622 | |||
623 | jmp dp3vga |
||
624 | |||
625 | dp4vga: |
||
626 | |||
627 | add esp,4 |
||
628 | |||
629 | pop edx |
||
630 | pop ecx |
||
631 | pop ebx |
||
632 | pop eax |
||
633 | pop ebp |
||
634 | |||
635 | ret |
||
636 | |||
637 | ; ---------- |
||
638 | |||
639 | |||
640 | |||
641 | vga_drawbackground_stretch: |
||
642 | |||
643 | |||
644 | push ebp |
||
645 | push eax |
||
646 | push ebx |
||
647 | push ecx |
||
648 | push edx |
||
649 | |||
650 | mov edx,dword [WinMapAddress-8] ; B |
||
651 | add edx,dword [WinMapAddress-8] ; +B |
||
652 | add edx,dword [WinMapAddress-8] ; +B |
||
653 | push edx |
||
654 | |||
655 | mov eax,[draw_data+32+0] ; x start:=(x+Xwin) |
||
656 | mov ebx,[draw_data+32+4] ; y start:=(y+Ywin) |
||
657 | mov ecx,eax |
||
658 | mov edx,ebx |
||
659 | |||
660 | imul edx, 640*4 ; (y+Ywin)*BytesPerScanLine |
||
661 | shl ecx,2 ; (x+Xwin)*BytesPerPixel |
||
662 | add ecx,edx ; |
||
663 | mov ebp,ecx ; store copy |
||
664 | add ecx,[0xfe80] ; +AddrLFB |
||
665 | ;entry point in LFB >> ECX:=(y+Ywin)*BytesPerScanLine+X*BytesPerPixel+Addr |
||
666 | |||
667 | shr ebp,5 ; change from 4 to 1/8 BytesPerPixel |
||
668 | add ebp,0xa0000 ; + VGABasePtr |
||
669 | ;VGA start address >> EBP:=(y+Ywin)*BytesPerScanLine+X*BytesPerPixel+AddrV |
||
670 | |||
671 | |||
672 | call calculate_edi |
||
673 | |||
674 | sdp3vga: ; MAIN LOOP |
||
675 | |||
676 | cmp [edi+WinMapAddress],byte 1 ; ptrBuffer^<>byte(1) |
||
677 | je sybgpvga |
||
678 | |||
679 | jmp snbgpvga |
||
680 | |||
681 | sybgpvga: |
||
682 | |||
683 | push eax ; x |
||
684 | push ebx ; y |
||
685 | push ecx ; LFB address |
||
686 | |||
687 | mov eax,dword [WinMapAddress-8] ; B |
||
688 | xor edx,edx |
||
689 | mov ebx,[esp+8] ; Xstart |
||
690 | mul ebx ; B*Xstart |
||
691 | xor edx,edx |
||
692 | mov ebx,[0xfe00] ; x screen width |
||
693 | div ebx ; B*Xstart/xwidth |
||
694 | lea esi,[eax+eax*2] ; *3 |
||
695 | mov eax,dword [WinMapAddress-4] ; H |
||
696 | xor edx,edx |
||
697 | mov ebx,[esp+4] ; Ystart |
||
698 | mul ebx ; H*Ystart |
||
699 | xor edx,edx |
||
700 | mov ebx,[0xfe04] ; y screen height |
||
701 | div ebx ; H*Ystart/yheight |
||
702 | |||
703 | xor edx,edx |
||
704 | mov ebx,[esp+12] ; B*3 |
||
705 | mul ebx ; |
||
706 | add esi,eax |
||
707 | mov eax,[esi+0x300000] ; color |
||
708 | and eax,0xffffff |
||
709 | |||
710 | mov ecx, [esp] ; LFB address |
||
711 | mov ebx,eax ; copy color |
||
712 | mov [ecx],bx |
||
713 | shr ebx,16 |
||
714 | mov [ecx+2],bl |
||
715 | |||
716 | xchg edi, ebp |
||
717 | mov ecx,[esp+8] ; x position |
||
718 | and ecx,0x07 ; x modulo 8 |
||
719 | call setvgapixel ; eax=color, ecx=x%8, edi=VGA address |
||
720 | xchg ebp, edi ; ebp+=3 |
||
721 | |||
722 | pop ecx |
||
723 | pop ebx |
||
724 | pop eax |
||
725 | |||
726 | snbgpvga: |
||
727 | |||
728 | inc eax ; x++ |
||
729 | cmp eax,[draw_data+32+8] ; X > xend? |
||
730 | jg snodp3vga |
||
731 | |||
732 | test eax,0x07 ; x test modulo 8 |
||
733 | jnz shook1vga |
||
734 | inc ebp ; VGA address++ |
||
735 | |||
736 | shook1vga: |
||
737 | add ecx,4 ; LFB address += 4 |
||
738 | inc edi ; ptrBuffer++ |
||
739 | add esi,3 ; ptrImage+=3 |
||
740 | jmp sdp3vga |
||
741 | |||
742 | snodp3vga: |
||
743 | |||
744 | mov eax,[draw_data+32+0] ; x+Xwin |
||
745 | inc ebx ; y position |
||
746 | mov ecx,eax |
||
747 | mov edx,ebx |
||
748 | |||
749 | imul edx, 640*4 ; (y+Ywin)*BytesPerScanLine |
||
750 | shl ecx,2 ; (x+Xwin)*BytesPerPixel |
||
751 | add ecx,edx ; |
||
752 | mov ebp,ecx ; store copy |
||
753 | add ecx,[0xfe80] ; +AddrLFB |
||
754 | ;entry point in LFB >> ECX:=(y+Ywin)*BytesPerScanLine+X*BytesPerPixel+Addr |
||
755 | |||
756 | |||
757 | shr ebp,5 ; change from 4 to 1/8 BytesPerPixel |
||
758 | add ebp,0xa0000 ; + VGABasePtr |
||
759 | ;VGA start address >> EBP:=(y+Ywin)*BytesPerScanLine+X*BytesPerPixel+A |
||
760 | |||
761 | |||
762 | call calculate_edi |
||
763 | |||
764 | cmp ebx,[draw_data+32+12] ; Y > yend |
||
765 | jg sdp4vga |
||
766 | |||
767 | jmp sdp3vga |
||
768 | |||
769 | sdp4vga: |
||
770 | |||
771 | add esp,4 |
||
772 | |||
773 | pop edx |
||
774 | pop ecx |
||
775 | pop ebx |
||
776 | pop eax |
||
777 | pop ebp |
||
778 | |||
779 | ret>>>>> |
||
780 |