Initial commit

engines/icb/non_ad_module.cpp

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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/>.
+ *
+ */
+
+#include "engines/icb/p4_generic_pc.h"
+
+namespace ICB {
+
+inline void pcApplyMatrixLV(MATRIX *m, VECTOR *invec, VECTOR *outvec) {
+	outvec->vx = ((int32)m->m[0][0] * invec->vx + (int32)m->m[0][1] * invec->vy + (int32)m->m[0][2] * invec->vz) >> 12;
+	outvec->vy = ((int32)m->m[1][0] * invec->vx + (int32)m->m[1][1] * invec->vy + (int32)m->m[1][2] * invec->vz) >> 12;
+	outvec->vz = ((int32)m->m[2][0] * invec->vx + (int32)m->m[2][1] * invec->vy + (int32)m->m[2][2] * invec->vz) >> 12;
+}
+
+void WorldToFilm(const PXvector_PC &worldpos, const PCcamera &camera, bool8 &is_onfilm, PXvector_PC &filmpos) {
+	VECTOR scrn;
+	VECTOR vWorldPos;
+	vWorldPos.vx = (int32)worldpos.x;
+	vWorldPos.vy = (int32)worldpos.y;
+	vWorldPos.vz = (int32)worldpos.z;
+
+	pcApplyMatrixLV(const_cast<MATRIX *>(&camera.view), &vWorldPos, &scrn);
+	scrn.vx += camera.view.t[0];
+	scrn.vy += camera.view.t[1];
+	scrn.vz += camera.view.t[2];
+
+	if (scrn.vz) {
+		scrn.vx = camera.focLen * scrn.vx / scrn.vz;
+		scrn.vy = camera.focLen * scrn.vy / scrn.vz;
+	}
+	filmpos.x = (float)scrn.vx;
+	filmpos.y = (float)-scrn.vy;        // px convention is upside down y
+	filmpos.z = (float)-scrn.vz / 4.0f; // px convention is -ve z : PSX also has zscale * 4 to make it more accurate
+
+	if ((scrn.vx < -SCREEN_WIDTH / 2) || (scrn.vx > SCREEN_WIDTH / 2) || (scrn.vy < -SCREEN_DEPTH / 2) || (scrn.vy > SCREEN_DEPTH / 2))
+		is_onfilm = FALSE8;
+	else
+		is_onfilm = TRUE8;
+}
+
+PXreal AngleOfVector(PXreal x, PXreal y) {
+	if (fabs(x) > 0.0001f) { /*smallest value safe for atan2*/
+		return (float)atan2(y, x) / (float)M_PI / 2;
+	} else {
+		// atan2's y/x would be infinite, so treat as special case
+		if (y > 0.0f)
+			return (0.5f /*half turn*/ / 2);
+		else
+			return (-0.5f /*half turn*/ / 2);
+	}
+}
+
+} // End of namespace ICB