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Rev Author Line No. Line
5153 IgorA 1 
;PUTPIXEL -> RGBPIXEL
2 
 
3 
locals
4 
	n dd ?
5 
	d_x dd ?
6 
	d_y dd ?
7 
	sx dd ? ;ширина буфера в пикселях
8 
	pp_inc_1 dd ?
9 
	pp_inc_2 dd ?
10 
	a dd ? ;register int
11 
if TGL_FEATURE_RENDER_BITS eq 24
12 
	r dd ? ;register unsigned int
13 
	g dd ?
14 
	b dd ?
15 
end if
16 
if INTERP_Z eq 1
17 
	pz dd ? ;register unsigned short *
18 
	zinc dd ?
19 
	z dd ? ;register int
20 
	zz dd ?
21 
end if
22 
endl
23 
pushad
24 
 
25 
	mov eax,[p1]
26 
	mov ebx,[p2]
27 
	mov ecx,[ebx+offs_zbup_y]
28 
	cmp [eax+offs_zbup_y], ecx ;if (p1.y > p2.y)
29 
	jg @f
30 
	jl .end_0 ;if (p1.y != p2.y)
31 
	mov ecx,[ebx+offs_zbup_x]
32 
	cmp [eax+offs_zbup_x], ecx ;if (p1.x > p2.x)
33 
	jle .end_0 ;if (p1.x <= p2.x)
34 
	@@: ;if (p1.y > p2.y || (p1.y == p2.y && p1.x > p2.x))
35 
		mov [p1],ebx
36 
		mov [p2],eax
37 
	.end_0:
38 
 
39 
	mov eax,[zb]
40 
	mov edx,[eax+offs_zbuf_xsize]
41 
	mov [sx],edx
42 
	mov ecx,[p1]
43 
	mov edi,[eax+offs_zbuf_linesize]
44 
	imul edi,[ecx+offs_zbup_y]
45 
	mov edx,[ecx+offs_zbup_x]
46 
	imul edx,PSZB
47 
	add edi,edx
48 
	add edi,[eax+offs_zbuf_pbuf] ;edi = (zb.pbuf + zb.linesize*p1.y + p1.x*PSZB)
49 
if INTERP_Z eq 1
50 
	mov edx,[ecx+offs_zbup_y]
51 
	imul edx,[sx]
52 
	add edx,[ecx+offs_zbup_x]
5159 IgorA 53 
	shl edx,1
5153 IgorA 54 
	add edx,[eax+offs_zbuf_zbuf]
55 
	mov [pz],edx ;pz = zb.zbuf + (p1.y*sx + p1.x)
56 
	mov edx,[ecx+offs_zbup_z]
57 
	mov [z],edx ;z = p1.z
58 
end if
59 
 
60 
	mov ebx,[p2]
61 
	mov eax,[ebx+offs_zbup_x]
62 
	sub eax,[ecx+offs_zbup_x]
63 
	mov [d_x],eax ;d_x = p2.x - p1.x
64 
	mov eax,[ebx+offs_zbup_y]
65 
	sub eax,[ecx+offs_zbup_y]
66 
	mov [d_y],eax ;d_y = p2.y - p1.y
67 
if TGL_FEATURE_RENDER_BITS eq 24
68 
	; for 24 bits, we store the colors in different variables
69 
	mov eax,[ebx+offs_zbup_r]
70 
	shr eax,8
71 
	mov [r],eax ;r = p2.r >> 8
72 
	mov eax,[ebx+offs_zbup_g]
73 
	shr eax,8
74 
	mov [g],eax ;g = p2.g >> 8
75 
	mov eax,[ebx+offs_zbup_b]
76 
	shr eax,8
77 
	mov [b],eax ;b = p2.b >> 8
78 
end if
79 
 
80 
macro RGBPIXEL
81 
{
82 
if TGL_FEATURE_RENDER_BITS eq 24
83 
	mov eax,[r]
84 
	mov byte[edi],al
85 
	mov eax,[g]
86 
	mov byte[edi+1],al
87 
	mov eax,[b]
88 
	mov byte[edi+2],al
89 
;;;	else
90 
;;;	mov eax,[color]
91 
;;;	mov [edi],eax
92 
end if
93 
}
94 
 
95 
macro PUTPIXEL
96 
{
97 
if INTERP_Z eq 1
98 
local .end_0
99 
	mov eax,[z]
100 
	shr eax, ZB_POINT_Z_FRAC_BITS
101 
	mov [zz],eax
5159 IgorA 102 
	mov ebx,[pz]
103 
	cmp ax,word[ebx]
5153 IgorA 104 
	jl .end_0
105 
		RGBPIXEL
106 
		mov eax,dword[zz]
5159 IgorA 107 
		mov ebx,[pz]
108 
		mov word[ebx],ax
5153 IgorA 109 
	.end_0:
5159 IgorA 110 
else
5153 IgorA 111 
	RGBPIXEL
5159 IgorA 112 
end if
5153 IgorA 113 
}
114 
 
115 
macro DRAWLINE d_x,d_y,inc_1,inc_2
116 
{
5159 IgorA 117 
local .mz_0
118 
local .mz_1
119 
local .mz_2
120 
 
5153 IgorA 121 
	mov eax,d_x
122 
	mov [n],eax
123 
if INTERP_Z eq 1
124 
	mov ebx,[p1]
125 
	mov eax,[p2]
126 
	mov eax,[eax+offs_zbup_z]
5159 IgorA 127 
	cmp eax,[ebx+offs_zbup_z]
128 
	jg .mz_0
129 
	je .mz_1
130 
		;if(p2.z
131 
		sub eax,[ebx+offs_zbup_z]
132 
		neg eax
133 
		inc eax
134 
		xor edx,edx
135 
		div dword[n]
136 
		neg eax
137 
		inc eax
138 
		jmp .mz_2
139 
	.mz_0:
5153 IgorA 140 
	sub eax,[ebx+offs_zbup_z]
141 
	xor edx,edx
142 
	div dword[n]
5159 IgorA 143 
	jmp .mz_2
144 
	.mz_1:
145 
		xor eax,eax
146 
	.mz_2:
5153 IgorA 147 
	mov [zinc],eax ;zinc=(p2.z-p1.z)/n
148 
end if
149 
	shl dword d_y,1
150 
	mov eax, d_y
151 
	sub eax, d_x
152 
	mov [a],eax ;a=2*d_y-d_x
153 
	shl dword d_x,1
154 
	mov eax, d_y
155 
	sub d_x,eax
156 
	mov eax,inc_1
157 
	imul eax,PSZB
158 
	mov [pp_inc_1],eax ;pp_inc_1 = inc_1*PSZB
159 
	mov eax,inc_2
160 
	imul eax,PSZB
161 
	mov [pp_inc_2],eax ;pp_inc_2 = inc_2*PSZB
162 
 
163 
local .do_cycle
164 
local .els_0
165 
local .end_0
166 
 
167 
align 4
168 
.do_cycle:
169 
 
170 
	PUTPIXEL
171 
if INTERP_Z eq 1
172 
	mov eax,[zinc]
173 
	add [z],eax
174 
end if
175 
 
176 
	cmp dword[a],0
177 
	jle .els_0
178 
	add edi,[pp_inc_1]
179 
if INTERP_Z eq 1
180 
	mov eax,inc_1
5159 IgorA 181 
	shl eax,1
5153 IgorA 182 
	add [pz],eax
183 
end if
184 
	mov eax,d_x
185 
	sub [a],eax
186 
	jmp .end_0
187 
 
188 
.els_0:
189 
	add edi,[pp_inc_2]
190 
if INTERP_Z eq 1
191 
	mov eax,inc_2
5159 IgorA 192 
	shl eax,1
5153 IgorA 193 
	add [pz],eax
194 
end if
195 
	mov eax,d_y
196 
	add [a],eax
197 
 
198 
.end_0:
199 
	dec dword[n]
200 
	cmp dword[n],0
201 
	jge .do_cycle
202 
}
203 
 
204 
; fin macro
205 
 
206 
	mov eax,[d_x]
207 
	cmp eax,0
208 
	jne .els_0
209 
	cmp dword[d_y],0
210 
	jne .els_0
211 
		;if (d_x==0 && d_y==0)
212 
		PUTPIXEL
213 
		jmp .end_2
214 
	.els_0:
215 
	cmp eax,0
216 
	jle .els_3
217 
		;if (d_x > 0)
218 
		mov esi,[sx]
219 
		inc esi
220 
		cmp eax,[d_y]
221 
		jl .els_2
222 
			;if (d_x >= d_y)
223 
			DRAWLINE [d_x], [d_y], esi, 1
224 
			jmp .end_2
225 
		.els_2:
226 
			DRAWLINE [d_y], [d_x], esi, [sx]
227 
			jmp .end_2
228 
	.els_3:
229 
		xor eax,eax
230 
		sub eax,[d_x]
231 
		mov [d_x],eax
232 
		mov esi,[sx]
233 
		dec esi
234 
		cmp eax,[d_y]
235 
		jl .els_4
236 
			;if (d_x >= d_y)
237 
			DRAWLINE [d_x], [d_y], esi, -1
238 
			jmp .end_2
239 
		.els_4:
240 
			DRAWLINE [d_y], [d_x], esi, [sx]
241 
	.end_2:
242 
 
243 
popad
244 
	ret
245 
endp
246 
 
247 
restore INTERP_Z
248 
 
249 
; internal defines
250 
purge DRAWLINE
251 
purge PUTPIXEL
252 
purge RGBPIXEL