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Rev | Author | Line No. | Line |
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1778 | yogev_ezra | 1 | ;"Web" demo for KolibriOS, version 0.3 |
2 | ;Copyright Alexander Meshcheryakov (Self-Perfection), 2009 |
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3 | ;Contact me: alexander.s.m@gmail.com |
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4 | ;distributed under BSD license |
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5 | |||
6 | ;Used assumptions: |
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7 | ; 1) Screen resolution does not change while app is running |
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8 | ; 2) Screen width bigger than height |
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9 | ; 3) Screen width and height are even (2*k) |
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10 | |||
1796 | yogev_ezra | 11 | include '../../../macros.inc' |
1778 | yogev_ezra | 12 | |
13 | background_cl = 0x000000 |
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14 | foreground_cl = 0xFFFFFF |
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15 | |||
16 | delay = 4 |
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17 | |||
18 | ; debug = 1 |
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19 | |||
20 | MEOS_APP_START |
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21 | |||
22 | CODE |
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23 | ;Preinit. Randomize start counter |
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24 | mcall 3 |
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25 | mov [initial_counter], eax ;init with system time |
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26 | |||
27 | ;Query screen size |
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28 | mcall 14 |
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29 | add eax, 0x00010001 |
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30 | mov dword [y_max], eax ;store x_max and y_max |
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31 | shr eax, 1 |
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32 | mov dword [radius], eax ;store radius and x_center |
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33 | |||
34 | ;Calc line_number |
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35 | mov ax, [y_max] |
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36 | mov dx, 0 |
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37 | mov bx, 5 |
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38 | div bx |
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39 | mov word [half_line_number], ax |
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40 | movzx edx, ax ;edx = half_line_number |
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41 | imul edx, 2 * line_coords_element_size ;Space needed for line_coords_array |
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42 | |||
43 | ;Demand memory |
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44 | mcall 68, 11 ; Init heap |
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45 | test eax, eax ; Is heap successfully inited? |
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46 | jnz @f |
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47 | mcall -1 ; Netu pamjati?! Nu i nahuj vas |
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48 | @@: |
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49 | movzx ecx, [y_max] |
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50 | inc ecx |
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51 | movzx eax, [x_max] |
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52 | imul ecx, eax ;[Remember to left here space for 1-2 emergency lines at bottom] |
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53 | add ecx, edx ;And add space for line_coords_array |
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54 | mcall 68, 12, |
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55 | test eax, eax ; Did we get something non zero? |
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56 | jnz @f |
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57 | mcall -1 |
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58 | @@: |
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59 | mov [line_coords_array_pointer], eax |
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60 | add eax, edx |
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61 | mov [image_pointer], eax |
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62 | |||
63 | |||
64 | call clear_offscreen_bitmap |
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65 | |||
66 | |||
67 | |||
68 | ;Calc fixed line ends coords |
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69 | fninit |
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70 | fldpi |
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71 | fidiv word [half_line_number] ;Now st0 contains angle step of line start points |
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72 | |||
73 | mov eax, [line_coords_array_pointer] ;cleanup: comment |
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74 | movzx ecx, word [half_line_number] |
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75 | shl ecx, 1 |
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76 | fld st ;skip zero angle to avoid 1px fixed line at right side |
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77 | |||
78 | |||
79 | calculate_next_line_start_point: |
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80 | fld st |
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81 | |||
82 | ;Calculate line start points coords |
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83 | fsincos |
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84 | fimul [radius] |
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85 | fiadd [x_center] |
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86 | fistp word [eax+start_x_offset] |
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87 | ; fchs ;affects direction, uncomment with corresponding line below |
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88 | fimul [radius] |
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89 | fiadd [radius] |
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90 | fistp word [eax+start_y_offset] |
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91 | |||
92 | ;Calculate line start point pointer |
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93 | movzx ebx, word [eax+start_y_offset] |
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94 | movzx edx, word [x_max] |
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95 | imul ebx, edx |
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96 | movzx edx, word [eax+start_x_offset] |
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97 | add ebx, edx |
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98 | add ebx, [image_pointer] |
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99 | |||
100 | mov [eax+line_start_pointer_offset], ebx |
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101 | |||
102 | |||
103 | fadd st0, st1 |
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104 | add eax, line_coords_element_size ;Move to next element in line_coords_array |
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105 | |||
106 | loop calculate_next_line_start_point |
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107 | |||
108 | fstp st0 ;drop current angle |
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109 | fidiv [divider] ;change angle step |
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110 | |||
111 | |||
112 | draw_window: |
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113 | |||
114 | ;Start line coords calculation |
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115 | |||
116 | fld st ;skip zero angle to avoid 1px fixed line at right side |
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117 | |||
118 | ;Use time since start to get current counter value |
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119 | mcall 26, 9 |
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120 | add eax, [initial_counter] |
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121 | mov [current_counter], eax |
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122 | |||
123 | mov eax, [line_coords_array_pointer] ;cleanup: comment |
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124 | movzx ecx, word [half_line_number] |
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125 | shl ecx, 1 |
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126 | |||
127 | calculate_next_line_end_point: |
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128 | fld st |
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129 | |||
130 | ;Calculate line end points |
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131 | fimul [current_counter] |
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132 | fsincos |
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133 | fimul [radius] |
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134 | fiadd [x_center] |
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135 | fistp word [eax+2] |
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136 | ; fchs ;affects direction, uncomment with corresponding line above |
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137 | fimul [radius] |
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138 | fiadd [radius] |
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139 | fistp word [eax+6] |
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140 | |||
141 | fadd st0, st1 |
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142 | |||
143 | add eax, line_coords_element_size ;Move to next element in line_coords_array |
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144 | loop calculate_next_line_end_point |
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145 | |||
146 | fstp st0 ;drop current angle |
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147 | |||
148 | inc dword [initial_counter] |
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149 | |||
150 | |||
151 | ; ********************************************* |
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152 | ; *******Draw lines on offscreen bitmap******** |
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153 | ; ********************************************* |
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154 | |||
155 | ;draw end points |
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156 | movzx edi, [half_line_number] |
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157 | shl edi, 1 |
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158 | mov esi, [line_coords_array_pointer] |
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159 | |||
160 | draw_next_line: |
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161 | |||
162 | if defined debug ;Draw red points next to line ends in debug mode |
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163 | movzx ebx, word [esi+start_y_offset] |
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164 | movzx eax, word [x_max] |
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165 | imul eax, ebx |
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166 | movzx ebx, word [esi+start_x_offset] |
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167 | add eax, ebx |
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168 | add eax, dword [image_pointer] |
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169 | inc eax |
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170 | mov [eax], byte red_cl_index |
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171 | |||
172 | movzx ebx, word [esi+end_y_offset] |
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173 | movzx eax, word [x_max] |
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174 | imul eax, ebx |
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175 | movzx ebx, word [esi+end_x_offset] |
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176 | add eax, ebx |
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177 | add eax, dword [image_pointer] |
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178 | inc eax ;Move one right to make more visible |
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179 | mov [eax], byte red_cl_index |
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180 | end if |
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181 | |||
182 | |||
183 | ;Drawing lines. Need to keep esi and edi values in process |
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184 | |||
185 | mov eax, [esi+line_start_pointer_offset] |
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186 | |||
187 | check_horizontal_line: |
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188 | |||
189 | mov bx, word [esi+start_y_offset] |
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190 | cmp bx, word [esi+end_y_offset] |
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191 | jnz general_draw_line ;Jump to next test if dy!=0 |
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192 | |||
193 | pusha |
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194 | |||
195 | movzx ecx, word [esi+end_x_offset] |
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196 | sub cx, word [esi+start_x_offset] |
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197 | |||
198 | jnc @f |
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199 | neg cx |
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200 | sub eax, ecx |
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201 | @@: |
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202 | |||
203 | cld |
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204 | inc cx |
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205 | |||
206 | mov edi, eax |
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207 | mov al, foreground_cl_index |
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208 | rep stos byte [edi] |
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209 | |||
210 | popa |
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211 | |||
212 | jmp line_drawing_end |
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213 | |||
214 | |||
215 | |||
216 | ;General line draw algorithm. Based on Bresenham's algorithm (below) but heavily optimized |
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217 | ; function line(x0, x1, y0, y1) |
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218 | ; boolean steep := abs(y1 - y0) > abs(x1 - x0) |
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219 | ; if steep then |
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220 | ; swap(x0, y0) |
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221 | ; swap(x1, y1) |
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222 | ; if x0 > x1 then |
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223 | ; swap(x0, x1) |
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224 | ; swap(y0, y1) |
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225 | ; int deltax := x1 - x0 |
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226 | ; int deltay := abs(y1 - y0) |
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227 | ; int error := deltax / 2 |
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228 | ; int ystep |
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229 | ; int y := y0 |
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230 | ; if y0 < y1 then ystep := 1 else ystep := -1 |
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231 | ; for x from x0 to x1 |
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232 | ; if steep then plot(y,x) else plot(x,y) |
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233 | ; error := error - deltay |
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234 | ; if error < 0 then |
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235 | ; y := y + ystep |
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236 | ; error := error + deltax |
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237 | |||
238 | |||
239 | |||
240 | general_draw_line: |
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241 | pusha |
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242 | |||
243 | ;init step_base and step_secondary |
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244 | mov edx, esi |
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245 | mov esi, 1 |
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246 | movzx edi, word [x_max] |
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247 | |||
248 | ;calc initial delta_base & delta_secondary values |
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249 | movzx ebx, word [edx+end_x_offset] |
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250 | sub bx, [edx+start_x_offset] |
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251 | jnc @f |
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252 | neg bx |
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253 | neg esi |
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254 | @@: |
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255 | movzx ecx, word [edx+end_y_offset] |
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256 | sub cx, [edx+start_y_offset] |
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257 | jnc @f |
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258 | neg cx |
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259 | neg edi |
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260 | @@: |
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261 | |||
262 | ;compare abs(y1 - y0) and abs(x1 - x0) |
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263 | cmp bx, cx |
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264 | jnc @f |
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265 | xchg ebx, ecx |
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266 | xchg esi, edi |
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267 | @@: |
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268 | |||
269 | |||
270 | shl ebx, 16 |
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271 | mov bx, cx |
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272 | rol ebx, 16 |
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273 | mov cx, bx ;init counter |
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274 | inc cx |
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275 | mov dx, bx ;init error |
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276 | shr dx, 1 |
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277 | rol ebx, 16 |
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278 | |||
279 | |||
280 | ;At current point: |
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281 | ;eax = current point pointer |
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282 | ;ebx = (delta_base shl 16) + delta_secondary |
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283 | ;ecx = counter |
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284 | ;[e]dx = error |
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285 | ;esi = step_base |
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286 | ;edi = step_secondary |
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287 | |||
288 | |||
289 | brasenham_plot_point: |
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290 | mov byte [eax], foreground_cl_index |
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291 | add eax, esi |
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292 | |||
293 | sub dx, bx |
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294 | |||
295 | jnc end_loop |
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296 | |||
297 | ; y := y + ystep |
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298 | ; error := error + deltax |
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299 | change_y: |
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300 | add eax, edi |
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301 | rol ebx, 16 |
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302 | add dx, bx |
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303 | rol ebx, 16 |
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304 | |||
305 | end_loop: |
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306 | loopw brasenham_plot_point |
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307 | |||
308 | end_bresenham: |
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309 | |||
310 | popa |
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311 | |||
312 | line_drawing_end: |
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313 | |||
314 | add esi, line_coords_element_size ;Move to next element in line_coords_array |
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315 | dec edi |
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316 | jnz draw_next_line |
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317 | |||
318 | |||
319 | ; ********************************************* |
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320 | ; ******* WINDOW DEFINITIONS AND DRAW ******** |
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321 | ; ********************************************* |
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322 | ; mcall 18, 14 ;Wait for scanning (it seems doesn't do any good now) |
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323 | |||
324 | ; start redraw (without calling 12 proc our window overwrites window that above it) |
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325 | mcall 12, 1 |
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326 | xor eax,eax |
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327 | movzx ebx, [x_max] |
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328 | movzx ecx, [y_max] |
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329 | mov edx, 0x01000000 ;Window style ;Draw nothing |
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330 | ; mov edx, 0x00000000 ;Window style |
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331 | ; mov esi, 0x00000000 ;Header color (prevent odd color line on top of window in random cases) |
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332 | mcall ;Define window |
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333 | |||
334 | |||
335 | mov ebp, 0 |
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336 | mov ecx, dword [y_max] |
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337 | mcall 65, [image_pointer], , <0,0>, 8, palette |
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338 | |||
339 | |||
340 | mcall 12, 2 ; end redraw |
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341 | |||
342 | |||
343 | call clear_offscreen_bitmap |
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344 | |||
345 | wait_event: |
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346 | mcall 23, delay |
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347 | ; mcall 10 |
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348 | test eax, 0xFFFF - 1 ;Test for 0 (delay passed) or 1 (redraw) event |
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349 | jz draw_window ; Delay passed or redraw event |
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350 | dec eax |
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351 | dec eax |
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352 | jnz exit ; If not key then Alt+F4 |
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353 | ; key pressed, read it and ignore |
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354 | mcall 2 |
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355 | cmp eax, 0x1B00 ;Test for Escape key press |
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356 | jnz wait_event |
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357 | |||
358 | ; button pressed; we have only one button, close |
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359 | ; also seems to handle Alt+F4 |
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360 | exit: |
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361 | mcall -1 |
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362 | |||
363 | |||
364 | clear_offscreen_bitmap: |
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365 | mov edi, [image_pointer] |
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366 | movzx ecx, [y_max] |
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367 | movzx eax, [x_max] |
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368 | imul ecx, eax |
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369 | shr ecx, 2 ;dword is 4 bytes |
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370 | mov eax, 0 |
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371 | rep stos dword [edi] |
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372 | ret |
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373 | |||
374 | |||
375 | DATA |
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376 | divider dw 5000 |
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377 | |||
378 | palette: |
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379 | background_cl_index = 0 |
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380 | dd background_cl |
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381 | foreground_cl_index = 1 |
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382 | dd foreground_cl |
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383 | |||
384 | if defined debug |
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385 | red_cl_index = 2 |
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386 | dd 0x00FF0000 ;Cleanup this! |
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387 | end if |
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388 | |||
389 | UDATA |
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390 | image_pointer dd ? |
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391 | |||
392 | initial_counter dd ? |
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393 | current_counter dd ? ;counter + current time |
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394 | |||
395 | half_line_number dw ? |
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396 | |||
397 | y_max dw ? ; screen size |
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398 | x_max dw ? |
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399 | |||
400 | radius dw ? |
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401 | x_center dw ? |
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402 | |||
403 | line_coords_array_pointer dd ? |
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404 | |||
405 | ; line_coords_array: |
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406 | ; repeat 1000 ;line_number |
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407 | ; dw ? ;start_x |
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408 | ; dw ? ;end_x |
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409 | ; dw ? ;start_y |
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410 | ; dw ? ;end_y |
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411 | ; dd ? ;line_start_pointer |
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412 | ; end repeat |
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413 | |||
414 | start_x_offset = 0 |
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415 | end_x_offset = 2 |
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416 | start_y_offset = 4 |
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417 | end_y_offset = 6 |
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418 | line_start_pointer_offset = 8 |
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419 | line_coords_element_size = 12 |
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420 | |||
421 | MEOS_APP_END0,0>>> |