2 THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
3 SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO
4 END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
5 ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
6 IN USING, DISPLAYING, AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
7 SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
8 FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
9 CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS
10 AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
11 COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
16 * Graphical routines for drawing solid scanlines.
39 int Gr_scanline_darkening_level = GR_FADE_LEVELS;
41 #if !defined(NO_ASM) && defined(__WATCOMC__)
43 void gr_linear_darken( ubyte * dest, int darkening_level, int count, ubyte * fade_table );
44 #pragma aux gr_linear_darken parm [edi] [eax] [ecx] [edx] modify exact [eax ebx ecx edx edi] = \
47 "gld_loop: mov bl, [edi] " \
48 " mov al, [ebx+edx] " \
54 #elif !defined(NO_ASM) && defined(__GNUC__)
56 static inline void gr_linear_darken( ubyte * dest, int darkening_level, int count, ubyte * fade_table ) {
58 __asm__ __volatile__ (
61 "0: movb (%%edi), %%bl;"
62 " movb (%%ebx, %%edx), %%al;"
63 " movb %%al, (%%edi);"
67 : "=D" (dummy[0]), "=a" (dummy[1]), "=c" (dummy[2]), "=d" (dummy[3])
68 : "0" (dest), "1" (darkening_level), "2" (count), "3" (fade_table)
72 #elif !defined(NO_ASM) && defined(_MSC_VER)
74 __inline void gr_linear_darken( ubyte * dest, int darkening_level, int count, ubyte * fade_table )
78 mov eax,[darkening_level]
93 #else // Unknown compiler, or no assembler. So we use C.
95 void gr_linear_darken(ubyte * dest, int darkening_level, int count, ubyte * fade_table) {
100 *dest = fade_table[(*dest)+(darkening_level*256)];
107 #ifdef NO_ASM // No Assembler. So we use C.
109 void gr_linear_stosd( ubyte * dest, ubyte color, unsigned short count )
114 while ((int)(dest) & 0x3) { *dest++ = color; count--; };
116 x = (color << 24) | (color << 16) | (color << 8) | color;
117 while (count > 4) { *(int *)dest = x; dest += 4; count -= 4; };
119 while (count > 0) { *dest++ = color; count--; };
121 for (i=0; i<count; i++ )
126 void gr_linear_stosd( ubyte * dest, unsigned char color, unsigned int nbytes) {
127 memset(dest,color,nbytes);
132 void gr_uscanline( int x1, int x2, int y )
134 if (Gr_scanline_darkening_level >= GR_FADE_LEVELS ) {
139 ogl_ulinec(x1, y, x2, y, COLOR);
143 gr_linear_stosd( DATA + ROWSIZE*y + x1, (unsigned char)COLOR, x2-x1+1);
147 gr_modex_uscanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
150 gr_vesa_scanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
161 gr_linear_darken( DATA + ROWSIZE*y + x1, Gr_scanline_darkening_level, x2-x1+1, gr_fade_table);
165 gr_modex_uscanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
170 ubyte * vram = (ubyte *)0xA0000;
171 int VideoLocation,page,offset1, offset2;
173 VideoLocation = (ROWSIZE * y) + x1;
174 page = VideoLocation >> 16;
175 offset1 = VideoLocation & 0xFFFF;
176 offset2 = offset1 + (x2-x1+1);
178 gr_vesa_setpage( page );
179 if ( offset2 <= 0xFFFF ) {
180 gr_linear_darken( &vram[offset1], Gr_scanline_darkening_level, x2-x1+1, gr_fade_table);
182 gr_linear_darken( &vram[offset1], Gr_scanline_darkening_level, 0xFFFF-offset1+1, gr_fade_table);
184 gr_vesa_setpage(page);
185 gr_linear_darken( vram, Gr_scanline_darkening_level, offset2 - 0xFFFF, gr_fade_table);
189 gr_vesa_scanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
197 void gr_scanline( int x1, int x2, int y )
199 if ((y<0)||(y>MAXY)) return;
201 if (x2 < x1 ) x2 ^= x1 ^= x2;
203 if (x1 > MAXX) return;
204 if (x2 < MINX) return;
206 if (x1 < MINX) x1 = MINX;
207 if (x2 > MAXX) x2 = MAXX;
209 if (Gr_scanline_darkening_level >= GR_FADE_LEVELS ) {
214 ogl_ulinec(x1, y, x2, y, COLOR);
218 gr_linear_stosd( DATA + ROWSIZE*y + x1, (unsigned char)COLOR, x2-x1+1);
222 gr_modex_uscanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
225 gr_vesa_scanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
236 gr_linear_darken( DATA + ROWSIZE*y + x1, Gr_scanline_darkening_level, x2-x1+1, gr_fade_table);
240 gr_modex_uscanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );
245 ubyte * vram = (ubyte *)0xA0000;
246 int VideoLocation,page,offset1, offset2;
248 VideoLocation = (ROWSIZE * y) + x1;
249 page = VideoLocation >> 16;
250 offset1 = VideoLocation & 0xFFFF;
251 offset2 = offset1 + (x2-x1+1);
253 gr_vesa_setpage( page );
254 if ( offset2 <= 0xFFFF ) {
255 gr_linear_darken( &vram[offset1], Gr_scanline_darkening_level, x2-x1+1, gr_fade_table);
257 gr_linear_darken( &vram[offset1], Gr_scanline_darkening_level, 0xFFFF-offset1+1, gr_fade_table);
259 gr_vesa_setpage(page);
260 gr_linear_darken( vram, Gr_scanline_darkening_level, offset2 - 0xFFFF, gr_fade_table);
264 gr_vesa_scanline( x1+XOFFSET, x2+XOFFSET, y+YOFFSET, COLOR );