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
33 //added/remove by dph on 1/9/99
38 #define SQUARE(x) ((x)*(x))
40 #define MAX_COMPUTED_COLORS 32
42 int Num_computed_colors=0;
45 ubyte r,g,b,color_num;
48 color_record Computed_colors[MAX_COMPUTED_COLORS];
50 ubyte gr_palette[256*3];
51 ubyte gr_current_pal[256*3];
52 ubyte gr_fade_table[256*34];
54 cvar_t gr_palette_gamma = { "gamma", "0", CVAR_NONE };
55 int gr_palette_gamma_param = 0;
56 ubyte gr_palette_faded_out = 1;
58 int grd_fades_disabled=0; // Used to skip fading for development
60 void gr_palette_set_gamma( int gamma )
62 if ( gamma < 0 ) gamma = 0;
63 //added/changed on 10/27/98 by Victor Rachels to increase brightness slider
64 if ( gamma > 16 ) gamma = 16; //was 8
65 //end this section change - Victor Rachels
67 if (gr_palette_gamma_param != gamma ) {
68 gr_palette_gamma_param = gamma;
69 cvar_setint(&gr_palette_gamma, gamma);
70 if (!gr_palette_faded_out)
71 gr_palette_load( gr_palette );
75 int gr_palette_get_gamma()
77 return gr_palette_gamma_param;
81 void gr_copy_palette(ubyte *gr_palette, ubyte *pal, int size)
83 memcpy(gr_palette, pal, size);
85 Num_computed_colors = 0;
89 void gr_use_palette_table( char * filename )
97 fp = cfopen( filename, "rb" );
99 // the following is a hack to enable the loading of d2 levels
100 // even if only the d2 mac shareware datafiles are present.
101 // However, if the pig file is present but the palette file isn't,
102 // the textures in the level will look wierd...
104 fp = cfopen( DEFAULT_LEVEL_PALETTE, "rb" );
106 Error("Can open neither palette file <%s> "
107 "nor default palette file <"
108 DEFAULT_LEVEL_PALETTE
112 fsize = cfilelength( fp );
113 Assert( fsize == 9472 );
114 cfread( gr_palette, 256*3, 1, fp );
115 cfread( gr_fade_table, 256*34, 1, fp );
118 // This is the TRANSPARENCY COLOR
119 for (i=0; i<GR_FADE_LEVELS; i++ ) {
120 gr_fade_table[i*256+255] = 255;
123 Num_computed_colors = 0; // Flush palette cache.
124 // swap colors 0 and 255 of the palette along with fade table entries
127 for (i = 0; i < 3; i++) {
129 gr_palette[i] = gr_palette[765+i];
130 gr_palette[765+i] = c;
133 for (i = 0; i < GR_FADE_LEVELS * 256; i++) {
134 if (gr_fade_table[i] == 0)
135 gr_fade_table[i] = 255;
137 for (i=0; i<GR_FADE_LEVELS; i++)
138 gr_fade_table[i*256] = TRANSPARENCY_COLOR;
142 // Add a computed color (by gr_find_closest_color) to list of computed colors in Computed_colors.
143 // If list wasn't full already, increment Num_computed_colors.
144 // If was full, replace a random one.
145 void add_computed_color(int r, int g, int b, int color_num)
149 if (Num_computed_colors < MAX_COMPUTED_COLORS) {
150 add_index = Num_computed_colors;
151 Num_computed_colors++;
153 add_index = (d_rand() * MAX_COMPUTED_COLORS) >> 15;
155 Computed_colors[add_index].r = r;
156 Computed_colors[add_index].g = g;
157 Computed_colors[add_index].b = b;
158 Computed_colors[add_index].color_num = color_num;
161 void init_computed_colors(void)
165 for (i=0; i<MAX_COMPUTED_COLORS; i++)
166 Computed_colors[i].r = 255; // Make impossible to match.
169 int gr_find_closest_color( int r, int g, int b )
172 int best_value, best_index, value;
174 if (Num_computed_colors == 0)
175 init_computed_colors();
177 // If we've already computed this color, return it!
178 for (i=0; i<Num_computed_colors; i++)
179 if (r == Computed_colors[i].r)
180 if (g == Computed_colors[i].g)
181 if (b == Computed_colors[i].b) {
184 trec = Computed_colors[i-1];
185 Computed_colors[i-1] = Computed_colors[i];
186 Computed_colors[i] = trec;
187 return Computed_colors[i-1].color_num;
189 return Computed_colors[i].color_num;
196 best_value = SQUARE(r-gr_palette[0])+SQUARE(g-gr_palette[1])+SQUARE(b-gr_palette[2]);
199 add_computed_color(r, g, b, best_index);
203 // only go to 255, 'cause we dont want to check the transparent color.
204 for (i=1; i<254; i++ ) {
206 value = SQUARE(r-gr_palette[j])+SQUARE(g-gr_palette[j+1])+SQUARE(b-gr_palette[j+2]);
207 if ( value < best_value ) {
209 add_computed_color(r, g, b, i);
216 add_computed_color(r, g, b, best_index);
220 int gr_find_closest_color_15bpp( int rgb )
222 return gr_find_closest_color( ((rgb>>10)&31)*2, ((rgb>>5)&31)*2, (rgb&31)*2 );
226 int gr_find_closest_color_current( int r, int g, int b )
229 int best_value, best_index, value;
235 best_value = SQUARE(r-gr_current_pal[0])+SQUARE(g-gr_current_pal[1])+SQUARE(b-gr_current_pal[2]);
241 // only go to 255, 'cause we dont want to check the transparent color.
242 for (i=1; i<254; i++ ) {
244 value = SQUARE(r-gr_current_pal[j])+SQUARE(g-gr_current_pal[j+1])+SQUARE(b-gr_current_pal[j+2]);
245 if ( value < best_value ) {
255 void gr_make_cthru_table(ubyte * table, ubyte r, ubyte g, ubyte b )
260 for (i=0; i<256; i++ ) {
261 r1 = gr_palette[i*3+0] + r;
262 if ( r1 > 63 ) r1 = 63;
263 g1 = gr_palette[i*3+1] + g;
264 if ( g1 > 63 ) g1 = 63;
265 b1 = gr_palette[i*3+2] + b;
266 if ( b1 > 63 ) b1 = 63;
267 table[i] = gr_find_closest_color( r1, g1, b1 );
271 void gr_make_blend_table(ubyte *blend_table, ubyte r, ubyte g, ubyte b)
277 for (j = 0; j < GR_FADE_LEVELS; j++)
279 alpha = 1.0 - (float)j / ((float)GR_FADE_LEVELS - 1);
280 for (i = 0; i < 255; i++)
282 r1 = (ubyte)((1.0 - alpha) * (float)gr_palette[i * 3 + 0] + (alpha * (float)r));
283 g1 = (ubyte)((1.0 - alpha) * (float)gr_palette[i * 3 + 1] + (alpha * (float)g));
284 b1 = (ubyte)((1.0 - alpha) * (float)gr_palette[i * 3 + 2] + (alpha * (float)b));
285 blend_table[i + j * 256] = gr_find_closest_color(r1, g1, b1);
287 blend_table[i + j * 256] = 255; // leave white alone