texture mapping and shading LUTs

[metatoy] / src / colormgr.c

diff --git a/src/colormgr.c b/src/colormgr.c
index 8ab61c9..88e6d0d 100644 (file)
--- a/src/colormgr.c
+++ b/src/colormgr.c
@@ -1,11 +1,17 @@
+#include <stdio.h>
 #include "colormgr.h"
 #include "vga.h"
+#include "util.h"
 
-/* TODO bring in a proper color manager with shade LUTs later */
+unsigned char *colormap;
+int *shade_lut;
 
 void init_colormgr(void)
 {
        unsigned int i, r, g, b;
+       unsigned char *cptr;
+
+       cptr = colormap = malloc_nf(256 * 3);
 
        for(i=0; i<256; i++) {
                r = i & 0xe0;
@@ -16,16 +22,48 @@ void init_colormgr(void)
                g |= g >> 3;
                b |= (b >> 2) | (b >> 4);
 
-               vga_setpalent(i, r, g, b);
+               cptr[0] = r | (r >> 3);
+               cptr[1] = g | (g >> 3);
+               cptr[2] = b | (b >> 2) | (b >> 4);
+               vga_setpalent(i, cptr[0], cptr[1], cptr[2]);
+               cptr += 3;
+       }
+
+       shade_lut = calloc_nf(256 * SHADE_LEVELS, sizeof *shade_lut);
+}
+
+void load_colormap(int offs, int sz, unsigned char *col, unsigned char *slut)
+{
+       int i, j;
+       unsigned char *cptr;
+       int *sptr;
+
+       if(sz + offs > 256) sz = 256 - offs;
+
+       cptr = colormap + offs * 3;
+       sptr = shade_lut + (offs << SHADE_SHIFT);
+       for(i=0; i<sz; i++) {
+               cptr[0] = col[0];
+               cptr[1] = col[1];
+               cptr[2] = col[2];
+               vga_setpalent(offs + i, col[0], col[1], col[2]);
+               cptr += 3;
+               col += 3;
+
+               for(j=0; j<SHADE_LEVELS; j++) {
+                       sptr[j] = (int)slut[j];
+               }
+               sptr += SHADE_LEVELS;
+               slut += SHADE_LEVELS;
        }
 }
 
 int find_color(int r, int g, int b)
 {
-       return (r & 0xe0) | ((g >> 3) & 0x1c) | ((b >> 6) & 3);
+       return 0;       /* TODO */
 }
 
 int shade_color(int col, int shade)
 {
-       return col;     /* TODO */
+       return LOOKUP_SHADE(col, shade);
 }