polyfill_tex_gouraud
};
-struct pimage pimg_fb, pimg_texture;
+struct pimage pfill_fb, pfill_tex;
void polyfill(int mode, struct pvertex *verts, int nverts)
{
++v;
x1 = v->x >> 8;
y1 = v->y >> 8;
- if(clip_line(&x0, &y0, &x1, &y1, 0, 0, pimg_fb.width, pimg_fb.height)) {
+ if(clip_line(&x0, &y0, &x1, &y1, 0, 0, pfill_fb.width, pfill_fb.height)) {
draw_line(x0, y0, x1, y1, color);
}
}
x0 = verts[0].x >> 8;
y0 = verts[0].y >> 8;
- if(clip_line(&x1, &y1, &x0, &y0, 0, 0, pimg_fb.width, pimg_fb.height)) {
+ if(clip_line(&x1, &y1, &x0, &y0, 0, 0, pfill_fb.width, pfill_fb.height)) {
draw_line(x1, y1, x0, y0, color);
}
}
#define NEXTIDX(x) (((x) - 1 + nverts) % nverts)
#define PREVIDX(x) (((x) + 1) % nverts)
+/* XXX
+ * When HIGH_QUALITY is defined, the rasterizer calculates slopes for attribute
+ * interpolation on each scanline separately; otherwise the slope for each
+ * attribute would be calculated once for the whole polygon, which is faster,
+ * but produces some slight quantization artifacts, due to the limited precision
+ * of fixed-point calculations.
+ */
+#undef HIGH_QUALITY
+
+/* extra bits of precision to use when interpolating colors.
+ * try tweaking this if you notice strange quantization artifacts.
+ */
+#define COLOR_SHIFT 12
+
+
#define POLYFILL polyfill_flat
#define SCANEDGE scanedge_flat
#undef GOURAUD