1 files changed, 138 insertions, 0 deletions

diff --git a/sdk/rwsdk/include/d3d8/rtintsec.h b/sdk/rwsdk/include/d3d8/rtintsec.h
new file mode 100644
index 00000000..a2e4c3d6
--- /dev/null
+++ b/sdk/rwsdk/include/d3d8/rtintsec.h
@@ -0,0 +1,138 @@
+/***************************************************************************
+ *                                                                         *
+ * Module  : rtintsec.h                                                    *
+ *                                                                         *
+ * Purpose : Intersection tests on geometry primitives.                    *
+ *                                                                         *
+ **************************************************************************/
+
+#ifndef RTINTSEC_H
+#define RTINTSEC_H
+
+/**
+ * \defgroup rtintersection RtIntersection
+ * \ingroup mathtools
+ *
+ * Object Intersection Toolkit for RenderWare.
+ */
+
+/****************************************************************************
+ Includes
+ */
+
+#include <rwcore.h>
+#include "rtintsec.rpe"    /* automatically generated header file */
+
+/****************************************************************************
+ Defines
+ */
+
+#define RTINTSECEPSILON (RwReal)(1e-8)
+#define RTINTSECEDGEEPS (RwReal)(1e-5)
+
+#define RtIntersectionLineTriangleMacro(_result,                        \
+                                     _lineStart, _lineDelta,            \
+                                     _v0, _v1, _v2,                     \
+                                     _distance)                         \
+MACRO_START                                                             \
+{                                                                       \
+    RwV3d               edge1, edge2, tVec, pVec, qVec;                 \
+    RwReal              det;                                            \
+                                                                        \
+    /* Find vectors for two edges sharing vert0 */                      \
+    RwV3dSubMacro(&edge1, (_v1), (_v0));                                \
+    RwV3dSubMacro(&edge2, (_v2), (_v0));                                \
+                                                                        \
+    /* Begin calculating determinant                                    \
+     * - also used to calculate U parameter */                          \
+    RwV3dCrossProductMacro(&pVec, (_lineDelta), &edge2);                \
+                                                                        \
+    /* If determinant is                                                \
+     * + near zero, ray lies in plane of                                \
+     *   triangle                                                       \
+     * + negative, triangle is backfacing                               \
+     */                                                                 \
+    det = RwV3dDotProductMacro(&edge1, &pVec);                          \
+    (_result) = (det > RTINTSECEPSILON);                                \
+                                                                        \
+    if ((_result))                                                      \
+    {                                                                   \
+        RwReal  lo, hi, u;                                              \
+                                                                        \
+        /* Calculate bounds for parameters with tolerance */            \
+        lo = - det*RTINTSECEDGEEPS;                                     \
+        hi = det - lo;                                                  \
+                                                                        \
+        /* Calculate U parameter and test bounds */                     \
+        RwV3dSubMacro(&tVec, (_lineStart), (_v0));                      \
+        u = RwV3dDotProductMacro(&tVec, &pVec);                         \
+        (_result) =  (u >= lo && u <= hi);                              \
+                                                                        \
+        if ((_result))                                                  \
+        {                                                               \
+            RwReal  v;                                                  \
+                                                                        \
+            /* Calculate V parameter and test bounds */                 \
+            RwV3dCrossProductMacro(&qVec, &tVec, &edge1);               \
+            v = RwV3dDotProductMacro((_lineDelta), &qVec);              \
+            (_result) = (v >= lo && (u + v) <= hi);                     \
+                                                                        \
+            if ((_result))                                              \
+            {                                                           \
+                /* Calculate t,                                         \
+                 * and make sure intersection is in bounds of line */   \
+                *(_distance) = RwV3dDotProductMacro(&edge2, &qVec);     \
+                                                                        \
+                /* Within bounds of line? */                            \
+                (_result) = (*(_distance) >= lo && *(_distance) <= hi); \
+                                                                        \
+                if ((_result))                                          \
+                {                                                       \
+                    *(_distance) = ((*(_distance)) / (det));            \
+                }                                                       \
+            }                                                           \
+        }                                                               \
+    }                                                                   \
+}                                                                       \
+MACRO_STOP
+
+
+/****************************************************************************
+ Global Types
+ */
+
+
+/* RWPUBLIC */
+/****************************************************************************
+ Function prototypes
+ */
+
+#ifdef    __cplusplus
+extern "C"
+{
+#endif                          /* __cplusplus */
+
+/* Line intersections */
+extern RwBool
+RtIntersectionLineTriangle(RwV3d *lineStart, RwV3d *lineDelta,
+                        RwV3d *v0, RwV3d *v1, RwV3d *v2, 
+                        RwReal *distance);
+
+/* Sphere intersections */
+extern RwBool
+RtIntersectionSphereTriangle(RwSphere *sphere, 
+                          RwV3d  *v0, RwV3d *v1, RwV3d *v2,
+                          RwV3d  *normal,
+                          RwReal *distance);
+
+/* BBox intersections */
+extern RwBool
+RtIntersectionBBoxTriangle(RwBBox *bbox, RwV3d *v0, RwV3d *v1, RwV3d *v2);
+
+#ifdef    __cplusplus
+}
+#endif                          /* __cplusplus */
+
+/* RWPUBLICEND */
+
+#endif /* RTINTSEC_H */