X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=bootcensus;a=blobdiff_plain;f=src%2Fcensus%2Fpolyfill.c;fp=src%2Fcensus%2Fpolyfill.c;h=3f94e25849e41bb9d30fcb444b2c547b0c7137df;hp=0000000000000000000000000000000000000000;hb=10843571c724084c68d33d0438167d400cc8de2e;hpb=f9194c22d8073b69b3e64fc26b9e245b6b54d009

diff --git a/src/census/polyfill.c b/src/census/polyfill.c
new file mode 100644
index 0000000..3f94e25
--- /dev/null
+++ b/src/census/polyfill.c
@@ -0,0 +1,179 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#if defined(__WATCOMC__) || defined(_MSC_VER) || defined(__DJGPP__)
+#include <malloc.h>
+#else
+#include <alloca.h>
+#endif
+#include "polyfill.h"
+#include "gfxutil.h"
+
+#define FILL_POLY_BITS	0x03
+
+/* mode bits: 00-wire 01-flat 10-gouraud 11-reserved
+ *     bit 2: texture
+ *     bit 3: blend
+ */
+void (*fillfunc[])(struct pvertex*, int) = {
+	polyfill_wire,
+	polyfill_flat,
+	polyfill_gouraud,
+	0,
+	polyfill_tex_wire,
+	polyfill_tex_flat,
+	polyfill_tex_gouraud,
+	0,
+	polyfill_blend_wire,
+	polyfill_blend_flat,
+	polyfill_blend_gouraud,
+	0,
+	polyfill_blend_tex_wire,
+	polyfill_blend_tex_flat,
+	polyfill_blend_tex_gouraud,
+	0
+};
+
+struct pimage pfill_fb, pfill_tex;
+
+void polyfill(int mode, struct pvertex *verts, int nverts)
+{
+#ifndef NDEBUG
+	if(!fillfunc[mode]) {
+		fprintf(stderr, "polyfill mode %d not implemented\n", mode);
+		abort();
+	}
+#endif
+
+	fillfunc[mode](verts, nverts);
+}
+
+void polyfill_wire(struct pvertex *verts, int nverts)
+{
+	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 - 1; i++) {
+		x0 = v->x >> 8;
+		y0 = v->y >> 8;
+		++v;
+		x1 = v->x >> 8;
+		y1 = v->y >> 8;
+		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);
+	}
+}
+
+void polyfill_tex_wire(struct pvertex *verts, int nverts)
+{
+	polyfill_wire(verts, nverts);	/* TODO */
+}
+
+void polyfill_blend_wire(struct pvertex *verts, int nverts)
+{
+	polyfill_wire(verts, nverts);	/* TODO */
+}
+
+void polyfill_blend_tex_wire(struct pvertex *verts, int nverts)
+{
+	polyfill_wire(verts, nverts);	/* TODO */
+}
+
+#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.
+ */
+#define 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
+#undef BLEND
+#include "polytmpl.h"
+#undef POLYFILL
+#undef SCANEDGE
+
+#define POLYFILL polyfill_gouraud
+#define SCANEDGE scanedge_gouraud
+#define GOURAUD
+#undef TEXMAP
+#undef BLEND
+#include "polytmpl.h"
+#undef POLYFILL
+#undef SCANEDGE
+
+#define POLYFILL polyfill_tex_flat
+#define SCANEDGE scanedge_tex_flat
+#undef GOURAUD
+#define TEXMAP
+#undef BLEND
+#include "polytmpl.h"
+#undef POLYFILL
+#undef SCANEDGE
+
+#define POLYFILL polyfill_tex_gouraud
+#define SCANEDGE scanedge_tex_gouraud
+#define GOURAUD
+#define TEXMAP
+#undef BLEND
+#include "polytmpl.h"
+#undef POLYFILL
+#undef SCANEDGE
+
+#define POLYFILL polyfill_blend_flat
+#define SCANEDGE scanedge_blend_flat
+#undef GOURAUD
+#undef TEXMAP
+#define BLEND
+#include "polytmpl.h"
+#undef POLYFILL
+#undef SCANEDGE
+
+#define POLYFILL polyfill_blend_gouraud
+#define SCANEDGE scanedge_blend_gouraud
+#define GOURAUD
+#undef TEXMAP
+#define BLEND
+#include "polytmpl.h"
+#undef POLYFILL
+#undef SCANEDGE
+
+#define POLYFILL polyfill_blend_tex_flat
+#define SCANEDGE scanedge_blend_tex_flat
+#undef GOURAUD
+#define TEXMAP
+#define BLEND
+#include "polytmpl.h"
+#undef POLYFILL
+#undef SCANEDGE
+
+#define POLYFILL polyfill_blend_tex_gouraud
+#define SCANEDGE scanedge_blend_tex_gouraud
+#define GOURAUD
+#define TEXMAP
+#define BLEND
+#include "polytmpl.h"
+#undef POLYFILL
+#undef SCANEDGE