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.
15 * Graphical routines for setting the palette
35 //added/remove by dph on 1/9/99
41 extern int gr_installed;
43 #define SQUARE(x) ((x)*(x))
45 #define MAX_COMPUTED_COLORS 32
47 int Num_computed_colors=0;
50 ubyte r,g,b,color_num;
53 color_record Computed_colors[MAX_COMPUTED_COLORS];
55 ubyte gr_palette[256*3];
56 ubyte gr_current_pal[256*3];
57 ubyte gr_fade_table[256*34];
59 ubyte gr_palette_gamma = 0;
60 int gr_palette_gamma_param = 0;
61 ubyte gr_palette_faded_out = 1;
63 int grd_fades_disabled=0; // Used to skip fading for development
65 void gr_palette_set_gamma( int gamma )
67 if ( gamma < 0 ) gamma = 0;
68 //added/changed on 10/27/98 by Victor Rachels to increase brightness slider
69 if ( gamma > 16 ) gamma = 16; //was 8
70 //end this section change - Victor Rachels
72 if (gr_palette_gamma_param != gamma ) {
73 gr_palette_gamma_param = gamma;
74 gr_palette_gamma = gamma;
75 if (!gr_palette_faded_out)
76 gr_palette_load( gr_palette );
80 int gr_palette_get_gamma()
82 return gr_palette_gamma_param;
86 void gr_copy_palette(ubyte *gr_palette, ubyte *pal, int size)
88 memcpy(gr_palette, pal, size);
90 Num_computed_colors = 0;
94 void gr_use_palette_table( char * filename )
102 fp = cfopen( filename, "rb" );
104 // the following is a hack to enable the loading of d2 levels
105 // even if only the d2 mac shareware datafiles are present.
106 // However, if the pig file is present but the palette file isn't,
107 // the textures in the level will look wierd...
109 fp = cfopen( DEFAULT_LEVEL_PALETTE, "rb" );
111 Error("Can open neither palette file <%s> "
112 "nor default palette file <"
113 DEFAULT_LEVEL_PALETTE
117 fsize = cfilelength( fp );
118 Assert( fsize == 9472 );
119 cfread( gr_palette, 256*3, 1, fp );
120 cfread( gr_fade_table, 256*34, 1, fp );
123 // This is the TRANSPARENCY COLOR
124 for (i=0; i<GR_FADE_LEVELS; i++ ) {
125 gr_fade_table[i*256+255] = 255;
128 Num_computed_colors = 0; // Flush palette cache.
129 // swap colors 0 and 255 of the palette along with fade table entries
132 for (i = 0; i < 3; i++) {
134 gr_palette[i] = gr_palette[765+i];
135 gr_palette[765+i] = c;
138 for (i = 0; i < GR_FADE_LEVELS * 256; i++) {
139 if (gr_fade_table[i] == 0)
140 gr_fade_table[i] = 255;
142 for (i=0; i<GR_FADE_LEVELS; i++)
143 gr_fade_table[i*256] = TRANSPARENCY_COLOR;
147 // Add a computed color (by gr_find_closest_color) to list of computed colors in Computed_colors.
148 // If list wasn't full already, increment Num_computed_colors.
149 // If was full, replace a random one.
150 void add_computed_color(int r, int g, int b, int color_num)
154 if (Num_computed_colors < MAX_COMPUTED_COLORS) {
155 add_index = Num_computed_colors;
156 Num_computed_colors++;
158 add_index = (d_rand() * MAX_COMPUTED_COLORS) >> 15;
160 Computed_colors[add_index].r = r;
161 Computed_colors[add_index].g = g;
162 Computed_colors[add_index].b = b;
163 Computed_colors[add_index].color_num = color_num;
166 void init_computed_colors(void)
170 for (i=0; i<MAX_COMPUTED_COLORS; i++)
171 Computed_colors[i].r = 255; // Make impossible to match.
174 int gr_find_closest_color( int r, int g, int b )
177 int best_value, best_index, value;
179 if (Num_computed_colors == 0)
180 init_computed_colors();
182 // If we've already computed this color, return it!
183 for (i=0; i<Num_computed_colors; i++)
184 if (r == Computed_colors[i].r)
185 if (g == Computed_colors[i].g)
186 if (b == Computed_colors[i].b) {
189 trec = Computed_colors[i-1];
190 Computed_colors[i-1] = Computed_colors[i];
191 Computed_colors[i] = trec;
192 return Computed_colors[i-1].color_num;
194 return Computed_colors[i].color_num;
201 best_value = SQUARE(r-gr_palette[0])+SQUARE(g-gr_palette[1])+SQUARE(b-gr_palette[2]);
204 add_computed_color(r, g, b, best_index);
208 // only go to 255, 'cause we dont want to check the transparent color.
209 for (i=1; i<254; i++ ) {
211 value = SQUARE(r-gr_palette[j])+SQUARE(g-gr_palette[j+1])+SQUARE(b-gr_palette[j+2]);
212 if ( value < best_value ) {
214 add_computed_color(r, g, b, i);
221 add_computed_color(r, g, b, best_index);
225 int gr_find_closest_color_15bpp( int rgb )
227 return gr_find_closest_color( ((rgb>>10)&31)*2, ((rgb>>5)&31)*2, (rgb&31)*2 );
231 int gr_find_closest_color_current( int r, int g, int b )
234 int best_value, best_index, value;
240 best_value = SQUARE(r-gr_current_pal[0])+SQUARE(g-gr_current_pal[1])+SQUARE(b-gr_current_pal[2]);
246 // only go to 255, 'cause we dont want to check the transparent color.
247 for (i=1; i<254; i++ ) {
249 value = SQUARE(r-gr_current_pal[j])+SQUARE(g-gr_current_pal[j+1])+SQUARE(b-gr_current_pal[j+2]);
250 if ( value < best_value ) {
260 void gr_make_cthru_table(ubyte * table, ubyte r, ubyte g, ubyte b )
265 for (i=0; i<256; i++ ) {
266 r1 = gr_palette[i*3+0] + r;
267 if ( r1 > 63 ) r1 = 63;
268 g1 = gr_palette[i*3+1] + g;
269 if ( g1 > 63 ) g1 = 63;
270 b1 = gr_palette[i*3+2] + b;
271 if ( b1 > 63 ) b1 = 63;
272 table[i] = gr_find_closest_color( r1, g1, b1 );
276 void gr_make_blend_table(ubyte *blend_table, ubyte r, ubyte g, ubyte b)
282 for (j = 0; j < GR_FADE_LEVELS; j++)
284 alpha = 1.0 - (float)j / ((float)GR_FADE_LEVELS - 1);
285 for (i = 0; i < 255; i++)
287 r1 = (ubyte)((1.0 - alpha) * (float)gr_palette[i * 3 + 0] + (alpha * (float)r));
288 g1 = (ubyte)((1.0 - alpha) * (float)gr_palette[i * 3 + 1] + (alpha * (float)g));
289 b1 = (ubyte)((1.0 - alpha) * (float)gr_palette[i * 3 + 2] + (alpha * (float)b));
290 blend_table[i + j * 256] = gr_find_closest_color(r1, g1, b1);
292 blend_table[i + j * 256] = 255; // leave white alone