sda4: commit the Glaze developer hard-drive dump

Un-ignored: the dev drive is the ground truth the restoration and
emulator work constantly reference (DPL3/LIBDPL + VRENDER i860 renderer
source, BT/RP live+dev game trees, VGL_LABS pod boot, scene/audio
content). Kept in-repo for the pod-owner community.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

sda4/DPL3/VRENDER/FITPLANS.C

@@ -0,0 +1,92 @@
+#define X0 0
+#define Y0 1
+#define X1 2
+#define Y1 3
+#define X2 4
+#define Y2 5
+
+#define X 0
+#define Y 1
+#define Z 2
+#define W 3
+
+#define MINAREA 1.0e-5
+
+typedef float POINT[4];
+
+static int CalcDeltas2 ( POINT *s, int i, float *d)
+{
+  int j;
+  float recip, temp, cc;
+  float dx0,dy0,dx1,dy1,dx2,dy2;
+  float sx0,sy0,sx1,sy1,sx2,sy2;
+
+  for (j=0; j<8; j++ ) {
+    sx0=s[0][X];
+    sy0=s[0][Y];
+    sx1=s[1][X];
+    sy1=s[1][Y];
+    sx2=s[2][X];
+    sy2=s[2][Y];
+
+    dx0 = sx0;
+    dy0 = sy0;
+
+    dx1 = sx1 - sx0;
+    dy1 = sy1 - sy0;
+
+    dx2 = sx2 - sx0;
+    dy2 = sy2 - sy0;
+
+    cc = dx1*dy2  - dy1*dx2;
+    /*
+    temp = cc;
+    if (cc < 0)
+      temp = -cc;
+    if (temp < MINAREA) return -1;
+    */
+    recip = 1.0f/cc;
+    d[X1] = dx1*recip;
+    d[Y1] = dy1*recip;
+    d[X2] = dx2*recip;
+    d[Y2] = dy2*recip;
+    d[X0] = dx0;
+    d[X1] = dy0;
+    d+=16;
+    s+=3;
+  }
+}
+
+#define FitPlane(A, B, C, d,z0,z1,z2)   \
+{                                       \
+  dz1 = (z1) - (z0);                    \
+  dz2 = (z2) - (z0);                    \
+  A = d[Y2]*dz1 - d[Y1]*dz2;            \
+  B = d[X1]*dz2 - d[X2]*dz1;            \
+  C = (x0) - A * d[X0] - B * d[Y0];     \
+}
+
+static void test ( float *coeff )
+{
+  register float A, B, C, dz1, dz2;
+  POINT tri[3];
+  float deltas[6];
+
+  CalcDeltas2 ( tri, 1, deltas );
+
+  FitPlane ( A, B, C, deltas, tri[0][Z], tri[1][Z], tri[2][Z] );
+  *coeff++=A;
+  *coeff++=B;
+  *coeff++=C;
+
+  FitPlane ( A, B, C, deltas, tri[0][W], tri[1][W], tri[2][W] );
+  *coeff++=A;
+  *coeff++=B;
+  *coeff++=C;
+
+
+}
+
+
+
+