Rev 1245 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
1245 | hidnplayr | 1 | draw_triangle: |
2 | ;----------in - eax - x1 shl 16 + y1 |
||
3 | ;------------- -ebx - x2 shl 16 + y2 |
||
4 | ;---------------ecx - x3 shl 16 + y3 |
||
5 | ;---------------edx - color 0x00rrggbb |
||
6 | ;---------------edi - pointer to screen buffer |
||
7 | |||
8 | .col equ ebp-4 ;dd ? |
||
9 | .x1 equ ebp-6 ;dw ? |
||
10 | .y1 equ ebp-8 ;dw ?;+8 |
||
11 | .x2 equ ebp-10 ;dw ? |
||
12 | .y2 equ ebp-12 ;dw ? |
||
13 | .x3 equ ebp-14 ;dw ? |
||
14 | .y3 equ ebp-16 ;dw ?;+16 |
||
15 | .dx12 equ ebp-20 ; dd ? |
||
16 | .dx13 equ ebp-24 ; dd ?;+24 |
||
17 | .dx23 equ ebp-28 ; dd ? |
||
18 | |||
19 | mov ebp,esp |
||
20 | ; sub esp,28 |
||
21 | push edx |
||
22 | .ch3: |
||
23 | cmp ax,bx |
||
24 | jg .ch1 |
||
25 | .ch4: ; sort parameters |
||
26 | cmp bx,cx |
||
27 | jg .ch2 |
||
28 | jle .chEnd |
||
29 | .ch1: |
||
30 | xchg eax,ebx |
||
31 | jmp .ch4 |
||
32 | .ch2: |
||
33 | xchg ebx,ecx |
||
34 | jmp .ch3 |
||
35 | .chEnd: |
||
36 | ; mov dword[.y1],eax ; ..and store to user friendly variables |
||
37 | ; mov dword[.y2],ebx |
||
38 | ; mov dword[.y3],ecx |
||
39 | ; mov [.col],edx |
||
40 | push eax |
||
41 | push ebx |
||
42 | push ecx |
||
43 | sub esp,12 |
||
44 | mov edx,eax ; eax,ebx,ecx are ORd together into edx which means that |
||
45 | or edx,ebx ; if any *one* of them is negative a sign flag is raised |
||
46 | or edx,ecx |
||
47 | test edx,80008000h ; Check both X&Y at once |
||
48 | jne .end_triangle |
||
49 | |||
6619 | leency | 50 | mov dx,[size_x_var] |
51 | cmp word[.x1],dx ;SIZE_X ; { |
||
1245 | hidnplayr | 52 | jg .end_triangle |
6619 | leency | 53 | cmp word[.x2],dx ;SIZE_X ; This can be optimized with effort |
1245 | hidnplayr | 54 | jg .end_triangle |
6619 | leency | 55 | cmp word[.x3],dx ;SIZE_X |
1245 | hidnplayr | 56 | jg .end_triangle ; } |
57 | |||
58 | shr eax,16 |
||
59 | shr ebx,16 |
||
60 | shr ecx,16 |
||
61 | |||
62 | neg ax ; calculate delta 12 |
||
63 | add ax,bx |
||
64 | cwde |
||
65 | shl eax,ROUND |
||
66 | cdq |
||
67 | mov bx,[.y2] |
||
68 | mov cx,[.y1] |
||
69 | sub bx,cx |
||
70 | ;cmp ebx,0 |
||
71 | jne .noZero1 |
||
72 | mov dword[.dx12],0 |
||
73 | jmp .yesZero1 |
||
74 | .noZero1: |
||
75 | idiv ebx |
||
76 | mov [.dx12],eax |
||
77 | .yesZero1: |
||
78 | |||
79 | mov ax,[.x3] ; calculate delta 13 |
||
80 | sub ax,[.x1] |
||
81 | cwde |
||
82 | shl eax,ROUND |
||
83 | cdq |
||
84 | mov bx,[.y3] |
||
85 | mov cx,[.y1] |
||
86 | sub bx,cx |
||
87 | ;cmp ebx,0 |
||
88 | jne .noZero2 |
||
89 | mov dword[.dx13],0 |
||
90 | jmp .yesZero2 |
||
91 | .noZero2: |
||
92 | idiv ebx |
||
93 | mov [.dx13],eax |
||
94 | .yesZero2: |
||
95 | |||
96 | mov ax,[.x3] ; calculate delta 23 [dx23] |
||
97 | sub ax,[.x2] |
||
98 | cwde |
||
99 | shl eax,ROUND |
||
100 | cdq |
||
101 | mov bx,[.y3] |
||
102 | mov cx,[.y2] |
||
103 | sub bx,cx |
||
104 | ;cmp ebx,0 |
||
105 | jne .noZero3 |
||
106 | mov dword[.dx23],0 |
||
107 | jmp .yesZero3 |
||
108 | .noZero3: |
||
109 | idiv ebx |
||
110 | mov [.dx23],eax |
||
111 | .yesZero3: |
||
112 | |||
113 | movsx eax,word[.x1] ; eax - xk1 ;;; |
||
114 | shl eax,ROUND |
||
115 | mov ebx,eax ; ebx - xk2 ;;; |
||
116 | movsx esi,word[.y1] ; esi - y |
||
117 | .next_line1: |
||
118 | mov ecx,eax ; ecx - x11 |
||
119 | sar ecx,ROUND |
||
120 | mov edx,ebx ; edx - x12 |
||
121 | sar edx,ROUND |
||
122 | cmp ecx,edx |
||
123 | jle .nochg |
||
124 | xchg ecx,edx |
||
125 | .nochg: |
||
126 | pusha |
||
127 | mov ebx,ecx |
||
128 | sub edx,ecx |
||
129 | mov ecx,edx |
||
130 | mov edx,esi |
||
131 | mov eax,[.col] |
||
132 | call .horizontal_line |
||
133 | popa |
||
134 | add eax,[.dx13] |
||
135 | add ebx,[.dx12] |
||
136 | inc esi |
||
137 | cmp si,[.y2] |
||
138 | jl .next_line1 |
||
139 | |||
140 | movzx esi,word[.y2] |
||
141 | movzx ebx,word[.x2] |
||
142 | shl ebx,ROUND |
||
143 | .next_line2: |
||
144 | mov ecx,eax |
||
145 | sar ecx,ROUND |
||
146 | mov edx,ebx |
||
147 | sar edx,ROUND |
||
148 | cmp ecx,edx |
||
149 | jle .nochg1 |
||
150 | xchg ecx,edx |
||
151 | .nochg1: |
||
152 | pusha |
||
153 | mov ebx,ecx |
||
154 | sub edx,ecx |
||
155 | mov ecx,edx |
||
156 | mov edx,esi |
||
157 | mov eax,[.col] |
||
158 | call .horizontal_line |
||
159 | popa |
||
160 | add eax,[.dx13] |
||
161 | add ebx,[.dx23] |
||
162 | inc esi |
||
163 | cmp si,[.y3] |
||
164 | jl .next_line2 |
||
165 | .end_triangle: |
||
166 | |||
167 | mov esp,ebp |
||
168 | ret |
||
169 | |||
170 | .horizontal_line: |
||
171 | ;---------in |
||
172 | ;---------eax - color of line, 0x00RRGGBB |
||
173 | ;---------ebx - x1 - x position of line begin |
||
174 | ;---------ecx - lenght of line |
||
175 | ;---------edx - y position of line |
||
176 | ;---------edi - pointer to buffer |
||
177 | jcxz .end_hor_l |
||
178 | ; or edx,edx |
||
179 | ; jl .end_hor_l |
||
6619 | leency | 180 | movzx esi,word[size_y_var] |
181 | cmp edx,esi ;SIZE_Y |
||
1245 | hidnplayr | 182 | jg .end_hor_l |
183 | push eax |
||
6619 | leency | 184 | movzx eax,word[size_x_var] |
185 | lea eax,[eax*3] |
||
186 | ; mov eax,SIZE_X*3 |
||
1245 | hidnplayr | 187 | mul edx |
188 | add edi,eax ; calculate line begin adress |
||
189 | ;add edi,ebx |
||
190 | ;shl ebx,1 |
||
191 | lea edi,[edi+ebx*2] |
||
192 | add edi,ebx |
||
193 | pop eax |
||
194 | cld |
||
195 | ;mov dword[edi-3],0000FF00h |
||
196 | dec ecx |
||
197 | jecxz .last_pix |
||
198 | .ddraw: ; Drawing horizontally: |
||
199 | ;push eax |
||
200 | stosd ; 4 bytes at a time |
||
201 | dec edi ; point to the 4th |
||
202 | loop .ddraw |
||
203 | .last_pix: |
||
204 | stosw |
||
205 | shr eax,16 |
||
206 | stosb |
||
207 | ; mov byte[edi],0 ; The last 4th will be reset |
||
208 | .end_hor_l: |
||
209 | ret |