#include <stdlib.h>
#include <string.h>
#include <assert.h>
-#if defined(__WATCOMC__) || defined(_MSC_VER)
+#if defined(__WATCOMC__) || defined(_MSC_VER) || defined(__DJGPP__)
#include <malloc.h>
#else
#include <alloca.h>
#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