X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=src%2Fxgl.c;h=515919e29f7649b4e43afb960a537adbb723b2ab;hb=f376a88158f9f99d738a51e306d137de62124569;hp=376d792bf7a62f8adb4ca211d09b3dd5a15cf727;hpb=5b98299a1aa716cc17cb5f70498c8e23cac945cb;p=gba_blender

diff --git a/src/xgl.c b/src/xgl.c
index 376d792..515919e 100644
--- a/src/xgl.c
+++ b/src/xgl.c
@@ -157,23 +157,31 @@ static void xform(struct xvertex *out, const struct xvertex *in, const int32_t *
 	out->z = XMUL(m[2], in->x) + XMUL(m[6], in->y) + XMUL(m[10], in->z) + m[14];
 }
 
+/* d = 1.0 / tan(fov/2) */
+#define PROJ_D	2.0f
+
 void xgl_draw(int prim, const struct xvertex *varr, int vcount)
 {
-	int i;
+	int i, cidx;
 	struct xvertex xv[4];
 	struct pvertex pv[4];
 
 	while(vcount >= prim) {
+		cidx = varr->cidx;
 		for(i=0; i<prim; i++) {
 			xform(xv + i, varr, mat[mtop]);
 			varr++;
 
+			xv[i].x = xv[i].x / (xv[i].z >> 8);	/* assume aspect: ~2 */
+			xv[i].y = (xv[i].y << 1) / (xv[i].z >> 8);
+			/* projection result is 24.8 */
+
 			/* viewport */
-			pv[i].x = ((((xv[i].x + 0x10000) >> 1) * vp[2]) >> 8) + (vp[0] << 8);
-			pv[i].y = ((((xv[i].y + 0x10000) >> 1) * vp[3]) >> 8) + (vp[1] << 8);
+			pv[i].x = (((xv[i].x + 0x100) >> 1) * vp[2]) + (vp[0] << 8);
+			pv[i].y = (((0x100 - xv[i].y) >> 1) * vp[3]) + (vp[1] << 8);
 		}
 		vcount -= prim;
 
-		polyfill_flat(pv, prim, 0xff);
+		polyfill_flat(pv, prim, cidx);
 	}
 }