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engines/icb/prim_route_builder.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * Additional copyright for this file:
+ * Copyright (C) 1999-2000 Revolution Software Ltd.
+ * This code is based on source code created by Revolution Software,
+ * used with permission.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef ICB_PRIM_ROUTE_BUILDER_H
+#define ICB_PRIM_ROUTE_BUILDER_H
+
+#include "engines/icb/common/px_rcutypes.h"
+#include "engines/icb/common/px_route_barriers.h"
+#include "engines/icb/route_manager.h"
+
+namespace ICB {
+
+#define MAX_barriers 255 // Changed from 256 to 300, 'cos M08 was tipping it.
+
+#if MAX_barriers > 255
+
+#error "MAX_barriers must be less than 256, because of e.g. uint8 temp_route[MAX_final_route];"
+
+#endif
+
+enum _route_stat { __PRIM_ROUTE_OK, __PRIM_ROUTE_FAIL };
+
+class _prim_route_builder {
+
+ public:
+	void Reset_barrier_list();
+	void Add_barrier(RouteBarrier *new_barrier);
+
+	_route_stat Calc_route(PXreal startx, PXreal startz, PXreal endx, PXreal endz); // does extraping
+
+	void Give_route(_route_description *route); // copy the route to pass_to
+	void Give_barrier_list(_route_description *route); // copy the barriers - this is for the debug NETHACK diagnostics mode
+
+	uint32 final_points;
+	_point final_route[MAX_final_route]; // tempory place for final route - caller should copy out
+	PXreal final_len; // internal temp flag - here so we can print it
+
+	uint32 extrap_size; // denotes the length to extend barriers by
+
+	// Public so everyone can use this function
+	int32 Get_intersect(PXreal x0, PXreal y0, PXreal x1, PXreal y1, PXreal x2, PXreal y2, PXreal x3, PXreal y3);
+
+	// This is a wrapper function to make the Cohen-Sutherland line-intersection algorithm
+	// available to the router.
+	bool8 LineIntersectsRect(DXrect oRect, int32 nX1, int32 nY1, int32 nX2, int32 nY2) const;
+
+private:
+	_point barrier_list[MAX_barriers];
+
+	uint32 total_points; // points dervived from start and end of each barrier line
+
+	// Bit based arrays hence the add 7 and divide by 8 (+7 rounds up)
+	uint8 hitsBits[MAX_barriers][(MAX_barriers + 7) / 8];
+	uint8 gohitsBits[MAX_barriers][(MAX_barriers + 7) / 8];
+
+	// Jake : note this can only be uint8 if MAX_barriers < 256
+	uint8 temp_route[MAX_final_route];
+
+	// These could be bit arrays as well :
+	// but not much gain compared to hits & gohits
+	uint8 exclude[MAX_barriers];
+	uint8 temp_exclude[MAX_barriers];
+
+#if defined(PRIM_BYTE_ARRAYS) && PRIM_BYTE_ARRAYS
+	uint8 hits[MAX_barriers][MAX_barriers];
+	uint8 gohits[MAX_barriers][MAX_barriers];
+#endif
+
+	void Find_connects(uint32 point, PXreal cur_len, uint32 level);
+	uint32 ExtrapolateLine(_point *pSrc0, _point *pSrc1, _point *pDst0, _point *pDst1, int32 d);
+	PXfloat m_fabs(PXfloat val); // abs
+};
+
+} // End of namespace ICB
+
+#endif