lower res, still slow

[gbajam22] / src / voxscape.c

diff --git a/src/voxscape.c b/src/voxscape.c
index a9008ab..60c2781 100644 (file)
--- a/src/voxscape.c
+++ b/src/voxscape.c
@@ -11,11 +11,12 @@
 #define FBWIDTH                240
 #define FBHEIGHT       160
 /* map size */
-#define XSZ                    512
-#define YSZ                    512
-#define XSHIFT         9
-#define XMASK          0x1ff
-#define YMASK          0x1ff
+#define XSZ                    256
+#define YSZ                    256
+#define XSHIFT         8
+#define XMASK          0xff
+#define YMASK          0xff
+#define HSCALE         20
 
 
 #define NO_LERP
@@ -61,6 +62,8 @@ struct voxscape *vox_create(int xsz, int ysz, uint8_t *himg, uint8_t *cimg)
 {
        struct voxscape *vox;
 
+       assert(xsz == XSZ && ysz == YSZ);
+
        if(!(vox = calloc(1, sizeof *vox))) {
                return 0;
        }
@@ -281,7 +284,7 @@ void vox_render_slice(struct voxscape *vox, int n)
                        color = last_col;
                } else {
                        hval = vox->height[offs] - vox->vheight;
-                       hval = hval * 40 / (vox->znear + n) + vox->horizon;
+                       hval = hval * HSCALE / (vox->znear + n) + vox->horizon;
                        if(hval > FBHEIGHT) hval = FBHEIGHT;
                        color = vox->color[offs];
                        last_offs = offs;
@@ -309,7 +312,7 @@ void vox_render_slice(struct voxscape *vox, int n)
                        color = last_col;
                } else {
                        hval = vox->height[offs] - vox->vheight;
-                       hval = hval * 40 / (vox->znear + n) + vox->horizon;
+                       hval = hval * HSCALE / (vox->znear + n) + vox->horizon;
                        if(hval > FBHEIGHT) hval = FBHEIGHT;
                        color = vox->color[offs];
                        last_offs = offs;