X-Git-Url: https://git.wh0rd.org/?p=ICEs.git;a=blobdiff_plain;f=394889%2Fs_triangle.i;fp=394889%2Fs_triangle.i;h=a18c13fe237e675844c2e5df81bf79fbc50dec0c;hp=0000000000000000000000000000000000000000;hb=bd3239d2bbe0de3a200b266503e3330b1e391489;hpb=dbff64cb4b7530861c2309c794efdd4e0cf47a23

diff --git a/394889/s_triangle.i b/394889/s_triangle.i
new file mode 100644
index 0000000..a18c13f
--- /dev/null
+++ b/394889/s_triangle.i
@@ -0,0 +1,103 @@
+static __inline__ int IS_INF_OR_NAN(float x)
+{
+	union {
+		float f;
+		int i;
+	} tmp;
+	tmp.f = x;
+	return tmp.i;
+}
+
+static void simple_textured_triangle(float **v1)
+{
+	float **v0;
+	float **v2;
+	typedef struct {
+		float dx;
+		float dy;
+		int fsx;
+		int fx0;
+		int lines;
+	} EdgeT;
+	EdgeT eMaj;
+	EdgeT eTop;
+	EdgeT eBot;
+	float oneOverArea;
+	float **vMin;
+	float **vMid;
+	float **vMax;
+	int vMin_fx;
+	int vMin_fy;
+	int vMid_fx;
+	int vMid_fy;
+	int vMax_fx;
+	int vMax_fy;
+	if (v1[0][1] <= v2[0][1]) {
+		vMin = v0;
+		vMax = v1;
+		vMin_fy = v0[0][1];
+	}
+	vMin_fx = vMin[0][0];
+	vMid_fx =
+	    vMid[4][0] ? ((vMid[4][0] * (float)2048) +
+			  0.5F) : ((vMid[4][0] * (float)2048) - 0.5F);
+	eMaj.dx = (vMax_fx - vMin_fx) * (1.0F / (float)2048);
+	eMaj.dy = (vMax_fy - vMin_fy) * (1.0F / (float)2048);
+	eTop.dx = (vMax_fx - vMid_fx) * (1.0F / (float)2048);
+	eBot.dy = (vMid_fy - vMin_fy) * (1.0F / (float)2048);
+	float area = eMaj.dx * eBot.dy - eBot.dx * eMaj.dy;
+	if (IS_INF_OR_NAN(area))
+		return;
+	oneOverArea = 1.0F / area;
+	eBot.fx0 = vMin_fx;
+	int scan_from_left_to_right;
+	float eMaj_ds = (vMax[4][0] - vMin[4][0]);
+	float eBot_ds;
+	float stepx = oneOverArea * (eMaj_ds * eBot.dy - eMaj.dy * eBot_ds);
+	int step = (stepx >= 0.0F) ? stepx : (stepx * (float)2048) - 0.5F;
+	int subTriangle;
+	int fxRightEdge = 0;
+	for (subTriangle = 0; subTriangle <= 1; subTriangle++) {
+		EdgeT *eRight;
+		int lines;
+		if (subTriangle == 0) {
+			if (scan_from_left_to_right) {
+				eRight = &eBot;
+				lines = eRight->lines;
+			} else {
+				eRight = &eMaj;
+			}
+		} else {
+			if (scan_from_left_to_right) {
+				eRight = &eTop;
+			}
+			fxRightEdge = eRight->fsx;
+		}
+		while (lines > 0) {
+			int end;
+			int x;
+			int y;
+			x = 0;
+			if (fxRightEdge <= x)
+				end = 0;
+			else
+				end = fxRightEdge - x;
+			if (end > 0 && y >= 0) {
+				int i;
+				char *rgb;
+				for (i = 0; i < end; i++) {
+					int it;
+					char *texture;
+					rgb[i] = texture[it];
+					it += step;
+				}
+				PutRowRGB(rgb);
+			}
+		}
+	}
+}
+
+void *foo()
+{
+	return simple_textured_triangle;
+}