rt: subsampling seems to work

diff --git a/src/scr/raytrace.c b/src/scr/raytrace.c
index 32ade1f..7b0314d 100644 (file)
--- a/src/scr/raytrace.c
+++ b/src/scr/raytrace.c
@@ -119,7 +119,7 @@ static void rend_tile(uint16_t *fbptr, int x0, int y0, int tsz, unsigned int val
 
        if(tsz <= 1) {
                if(!valid) {
-                       *fbptr = rend_pixel(x0, y0);
+                       *fbptr = 0xffff;//rend_pixel(x0, y0);
                }
                return;
        }
@@ -150,20 +150,36 @@ static void rend_tile(uint16_t *fbptr, int x0, int y0, int tsz, unsigned int val
        fb32 = (uint32_t*)fbptr;
 
        switch(tsz) {
+       case 2:
+#ifdef SUBDBG
+               pp0 = 0x18ff;
+#endif
+               fb32[0] = fb32[160] = pp0;
+               break;
        case 4:
+#ifdef SUBDBG
+               pp0 = pp1 = pp2 = pp3 = 0x03800380;
+#endif
+               fb32[0] = fb32[160] = pp0;
                fb32[1] = fb32[161] = pp1;
                fb32[320] = fb32[480] = pp2;
                fb32[321] = fb32[481] = pp3;
-       case 2:
-               fb32[0] = fb32[160] = pp0;
                break;
        case 8:
+#ifdef SUBDBG
+               pp1 = pp0 = pp2 = pp3 = 0xe00fe00f;
+#endif
                fb32[0] = fb32[1] = pp0; fb32[2] = fb32[3] = pp1;
                fb32[160] = fb32[161] = pp0; fb32[162] = fb32[163] = pp1;
-               fb32[320] = fb32[321] = pp2; fb32[322] = fb32[323] = pp3;
-               fb32[480] = fb32[481] = pp2; fb32[482] = fb32[483] = pp3;
+               fb32[320] = fb32[321] = pp0; fb32[322] = fb32[323] = pp1;
+               fb32[480] = fb32[481] = pp0; fb32[482] = fb32[483] = pp1;
+               fb32[640] = fb32[641] = pp2; fb32[642] = fb32[643] = pp3;
+               fb32[800] = fb32[801] = pp2; fb32[802] = fb32[803] = pp3;
+               fb32[960] = fb32[961] = pp2; fb32[962] = fb32[963] = pp3;
+               fb32[1120] = fb32[1121] = pp2; fb32[1122] = fb32[1123] = pp3;
                break;
        }
+       return;
 
 subdiv:
        *cptr[0] = cpix[0];
@@ -177,7 +193,7 @@ subdiv:
        fbptr += (tsz << 8) + (tsz << 6);
        y0 += tsz;
        rend_tile(fbptr, x0, y0, tsz, 4);
-       rend_tile(fbptr, x0 + tsz, y0, tsz, 8);
+       rend_tile(fbptr + tsz, x0 + tsz, y0, tsz, 8);
 }
 
 static void draw(void)