#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#if defined(__WATCOMC__) || defined(_MSC_VER)
+#include <malloc.h>
+#else
+#include <alloca.h>
+#endif
#include "polyfill.h"
#include "gfxutil.h"
#include "demo.h"
void (*fillfunc[])(struct pvertex*, int) = {
polyfill_wire,
- 0, 0, 0, 0
+ polyfill_flat,
+ polyfill_gouraud,
+ polyfill_tex,
+ polyfill_tex_gouraud
};
+struct pimage pfill_fb, pfill_tex;
+
void polyfill(int mode, struct pvertex *verts, int nverts)
{
#ifndef NDEBUG
void polyfill_wire(struct pvertex *verts, int nverts)
{
- int i;
+ int i, x0, y0, x1, y1;
struct pvertex *v = verts;
unsigned short color = ((v->r << 8) & 0xf800) |
((v->g << 3) & 0x7e0) | ((v->b >> 3) & 0x1f);
- for(i=0; i<nverts; i++) {
- int x0, y0, x1, y1;
+ for(i=0; i<nverts - 1; i++) {
x0 = v->x >> 8;
y0 = v->y >> 8;
++v;
x1 = v->x >> 8;
y1 = v->y >> 8;
- clip_line(&x0, &y0, &x1, &y1, 0, 0, fb_width, fb_height);
- draw_line(x0, y0, x1, y1, color);
+ 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, 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
+#undef TEXMAP
+#include "polytmpl.h"
+#undef POLYFILL
+#undef SCANEDGE
+
+#define POLYFILL polyfill_gouraud
+#define SCANEDGE scanedge_gouraud
+#define GOURAUD
+#undef TEXMAP
+#include "polytmpl.h"
+#undef POLYFILL
+#undef SCANEDGE
+
+#define POLYFILL polyfill_tex
+#define SCANEDGE scanedge_tex
+#undef GOURAUD
+#define TEXMAP
+#include "polytmpl.h"
+#undef POLYFILL
+#undef SCANEDGE
+
+#define POLYFILL polyfill_tex_gouraud
+#define SCANEDGE scanedge_tex_gouraud
+#define GOURAUD
+#define TEXMAP
+#include "polytmpl.h"
+#undef POLYFILL
+#undef SCANEDGE