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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.
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#include "sci/include/engine.h"
#include "sci/engine/kernel.h"
namespace Sci {
reg_t kRandom(EngineState *s, int funct_nr, int argc, reg_t *argv) {
return make_reg(0, SKPV(0) + (int)((SKPV(1) + 1.0 - SKPV(0)) * (rand() / (RAND_MAX + 1.0))));
}
reg_t kAbs(EngineState *s, int funct_nr, int argc, reg_t *argv) {
// This is a hack, but so is the code in Hoyle1 that needs it.
if (argv[0].segment)
return make_reg(0, 0x3e8); // Yes people, this is an object
return make_reg(0, abs(SKPV(0)));
}
reg_t kSqrt(EngineState *s, int funct_nr, int argc, reg_t *argv) {
return make_reg(0, (int16) sqrt((float) abs(SKPV(0))));
}
int get_angle(int xrel, int yrel) {
if ((xrel == 0) && (yrel == 0))
return 0;
else {
int val = (int)(180.0 / PI * atan2((double)xrel, (double) - yrel));
if (val < 0)
val += 360;
// Take care of OB1 differences between SSCI and
// FSCI. SCI games sometimes check for equality with
// "round" angles
if (val % 45 == 44)
val++;
else if (val % 45 == 1)
val--;
return val;
}
}
reg_t kGetAngle(EngineState *s, int funct_nr, int argc, reg_t *argv) {
// Based on behavior observed with a test program created with
// SCI Studio.
int x1 = SKPV(0);
int y1 = SKPV(1);
int x2 = SKPV(2);
int y2 = SKPV(3);
int xrel = x2 - x1;
int yrel = y1 - y2; // y-axis is mirrored.
int angle;
// Move (xrel, yrel) to first quadrant.
if (y1 < y2)
yrel = -yrel;
if (x2 < x1)
xrel = -xrel;
// Compute angle in grads.
if (yrel == 0 && xrel == 0)
angle = 0;
else
angle = 100 * xrel / (xrel + yrel);
// Fix up angle for actual quadrant of (xrel, yrel).
if (y1 < y2)
angle = 200 - angle;
if (x2 < x1)
angle = 400 - angle;
// Convert from grads to degrees by merging grad 0 with grad 1,
// grad 10 with grad 11, grad 20 with grad 21, etc. This leads to
// "degrees" that equal either one or two grads.
angle -= (angle + 9) / 10;
return make_reg(0, angle);
}
reg_t kGetDistance(EngineState *s, int funct_nr, int argc, reg_t *argv) {
int xrel = (int)(((float) SKPV(1) - SKPV_OR_ALT(3, 0)) / cos(SKPV_OR_ALT(5, 0) * PI / 180.0)); // This works because cos(0)==1
int yrel = SKPV(0) - SKPV_OR_ALT(2, 0);
return make_reg(0, (int16)sqrt((float) xrel*xrel + yrel*yrel));
}
reg_t kTimesSin(EngineState *s, int funct_nr, int argc, reg_t *argv) {
int angle = SKPV(0);
int factor = SKPV(1);
return make_reg(0, (int)(factor * 1.0 * sin(angle * PI / 180.0)));
}
reg_t kTimesCos(EngineState *s, int funct_nr, int argc, reg_t *argv) {
int angle = SKPV(0);
int factor = SKPV(1);
return make_reg(0, (int)(factor * 1.0 * cos(angle * PI / 180.0)));
}
reg_t kCosDiv(EngineState *s, int funct_nr, int argc, reg_t *argv) {
int angle = SKPV(0);
int value = SKPV(1);
double cosval = cos(angle * PI / 180.0);
if ((cosval < 0.0001) && (cosval > 0.0001)) {
warning("Attepted division by zero");
return make_reg(0, (int16)0x8000);
} else
return make_reg(0, (int16)(value / cosval));
}
reg_t kSinDiv(EngineState *s, int funct_nr, int argc, reg_t *argv) {
int angle = SKPV(0);
int value = SKPV(1);
double sinval = sin(angle * PI / 180.0);
if ((sinval < 0.0001) && (sinval > 0.0001)) {
warning("Attepted division by zero");
return make_reg(0, (int16)0x8000);
} else
return make_reg(0, (int16)(value / sinval));
}
reg_t kTimesTan(EngineState *s, int funct_nr, int argc, reg_t *argv) {
int param = SKPV(0);
int scale = SKPV_OR_ALT(1, 1);
param -= 90;
if ((param % 90) == 0) {
warning("Attempted tan(pi/2)");
return make_reg(0, (int16)0x8000);
} else
return make_reg(0, (int16) - (tan(param * PI / 180.0) * scale));
}
reg_t kTimesCot(EngineState *s, int funct_nr, int argc, reg_t *argv) {
int param = SKPV(0);
int scale = SKPV_OR_ALT(1, 1);
if ((param % 90) == 0) {
warning("Attempted tan(pi/2)");
return make_reg(0, (int16)0x8000);
} else
return make_reg(0, (int16)(tan(param * PI / 180.0) * scale));
}
} // End of namespace Sci
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