X-Git-Url: https://git.wh0rd.org/?p=ICEs.git;a=blobdiff_plain;f=394889%2Fs_triangle.i.14;fp=394889%2Fs_triangle.i.14;h=e9be740dba9fe84f87bb40ea9fa7b15be6c2a9b2;hp=0000000000000000000000000000000000000000;hb=bd3239d2bbe0de3a200b266503e3330b1e391489;hpb=dbff64cb4b7530861c2309c794efdd4e0cf47a23

diff --git a/394889/s_triangle.i.14 b/394889/s_triangle.i.14
new file mode 100644
index 0000000..e9be740
--- /dev/null
+++ b/394889/s_triangle.i.14
@@ -0,0 +1,146 @@
+typedef union {
+	float f;
+	int i;
+} fi_type;
+static __inline__ int IS_INF_OR_NAN(float x)
+{
+	fi_type tmp;
+	tmp.f = x;
+	return !(int)((unsigned int)((tmp.i & 0x7fffffff) - 0x7f800000) >> 31);
+}
+
+struct gl_texture_image {
+	unsigned int Width;
+	unsigned int Height;
+	void *Data;
+};
+struct gl_renderbuffer {
+	void (*PutRowRGB) ();
+};
+typedef struct {
+	float attrib[30][4];
+} SWvertex;
+typedef struct sw_span {
+	int x; int y;
+	unsigned int end;
+	float attrStepX[30][4];
+	int intTex[2]; int intTexStep[2];
+} SWspan;
+static void simple_textured_triangle(const SWvertex * v1)
+{
+	const SWvertex *v0;
+	const SWvertex *v2;
+	typedef struct {
+		float dx;
+		float dy;
+		int fsx;
+		int fx0;
+		int lines;
+	} EdgeT;
+	EdgeT eMaj;
+	EdgeT eTop;
+	EdgeT eBot;
+	float oneOverArea;
+	const SWvertex *vMin;
+	const SWvertex *vMid;
+	const SWvertex *vMax;
+	int vMin_fx;
+	int vMin_fy;
+	int vMid_fx;
+	int vMid_fy;
+	int vMax_fx;
+	int vMax_fy;
+	SWspan span;
+	const int fy0 = v0->attrib[0][1];
+	const int fy1 = v1->attrib[0][1];
+	const int fy2 = v2->attrib[0][1];
+		if (fy1 <= fy2) 
+{
+			vMin = v0;
+			vMax = v1;
+			vMin_fy = fy0;
+		}
+	vMin_fx = vMin->attrib[0][0];
+	vMid_fx = 
+	    (((int)
+	      ((vMid->attrib[0][0]  >=
+		0) ? ((vMid->attrib[0][0]  * (float)2048
+) +
+			 0.5F) : (((vMid->attrib[0][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));
+	const 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;
+	struct gl_renderbuffer *rb;
+	const struct gl_texture_image *texImg;
+	const float twidth;
+	const int twidth_log2;
+	const unsigned char *texture = texImg->Data;
+	const int smask = texImg->Width;
+	const int tmask = texImg->Height;
+	float eMaj_ds = (vMax->attrib[4][0] - vMin->attrib[4][0]) * twidth;
+	float eBot_ds;
+	span.attrStepX[4][0] =
+	    oneOverArea * (eMaj_ds * eBot.dy - eMaj.dy * eBot_ds);
+	span.intTexStep[0] = 
+	    (((int)
+	      ((((span.attrStepX[4][0]) * (float)2048) >=
+		0.0F) ? (((span.attrStepX[4][0]) * (float)2048) +
+			 0.5F) : (((span.attrStepX[4][0]) * (float)2048) -
+				  0.5F))));
+	int subTriangle;
+	int fxLeftEdge = 0;
+	int fxRightEdge = 0;
+	int sLeft = 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) {
+			const int right = fxRightEdge ;
+			span.x = 0;
+			if (right <= span.x)
+				span.end = 0;
+			else
+				span.end = right - span.x;
+			span.intTex[0] = 0;
+			if (span.end > 0 && span.y >= 0) {
+				unsigned int i;
+				unsigned char rgb[16384][3];
+				for (i = 0; i < span.end; i++) 
+{
+					int s = span.intTex[0];
+					int t = span.intTex[1];
+					int pos = (t << twidth_log2)  + s;
+					rgb[i][0] = texture[pos ];
+					span.intTex[0] += span.intTexStep[0];
+				}
+				rb->PutRowRGB(rgb);
+			}
+		}
+	}
+}
+
+void *foo()
+{
+	return simple_textured_triangle;
+}