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Diffstat (limited to 'engines/cryomni3d/omni3d.cpp')
-rw-r--r-- | engines/cryomni3d/omni3d.cpp | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/engines/cryomni3d/omni3d.cpp b/engines/cryomni3d/omni3d.cpp new file mode 100644 index 0000000000..5c6d6db21c --- /dev/null +++ b/engines/cryomni3d/omni3d.cpp @@ -0,0 +1,275 @@ +/* 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. + * + */ + +#include "engines/cryomni3d/omni3d.h" + +#include "common/rect.h" + +namespace CryOmni3D { + +void Omni3DManager::init(double hfov) { + _alpha = 0.; + _beta = 0.; + _xSpeed = 0.; + _ySpeed = 0.; + + double oppositeSide = tan(hfov / 2.) / (4. / 3.); + double vf = atan2(oppositeSide, 1.); + _vfov = (M_PI_2 - vf - (13. / 180.*M_PI)) * 10. / 9.; + + double warpVfov = 155. / 180. * M_PI; + double hypV = 768. / 2. / sin(warpVfov / 2.); + double oppHTot = tan(hfov / 2.) * 16. / 320.; + _helperValue = 2048 * 65536 / (2. * M_PI); + + for (int i = 0; i < 31; i++) { + double oppH = (i - 15) * oppHTot; + double angle = atan2(oppH, 1.); + + _anglesH[i] = angle; + _hypothenusesH[i] = sqrt(oppH * oppH + 1); + + double oppVTot = hypV * _hypothenusesH[i]; + for (int j = 0; j < 21; j++) { + double oppV = (j - 20) * oppHTot; + + _oppositeV[j] = oppV; + + double coord = sqrt(oppV * oppV + _hypothenusesH[i] * _hypothenusesH[i]); + coord = oppVTot / coord; + coord = coord * 65536; + + _squaresCoords[i][j] = coord; + } + } + + _surface.create(640, 480, Graphics::PixelFormat::createFormatCLUT8()); + clearConstraints(); +} + +Omni3DManager::~Omni3DManager() { + _surface.free(); +} + +void Omni3DManager::updateCoords(int xDelta, int yDelta, bool useOldSpeed) { + double xDelta1 = xDelta * 0.00025; + double yDelta1 = yDelta * 0.0002; + + if (useOldSpeed) { + _xSpeed += xDelta1; + _ySpeed += yDelta1; + } else { + _xSpeed = xDelta1; + _ySpeed = yDelta1; + } + _alpha += _xSpeed; + _beta += _ySpeed; + + //debug("alpha = %lf beta = %lf xSpeed = %lf ySpeed = %lf", _alpha, _beta, _xSpeed, _ySpeed); + + _xSpeed *= 0.4; + _ySpeed *= 0.6; + + if (useOldSpeed) { + if (abs(_xSpeed) < 0.001) { + _xSpeed = 0.; + } + if (abs(_ySpeed) < 0.001) { + _ySpeed = 0.; + } + } + + if (_alpha < _alphaMin) { + _alpha = _alphaMin; + _xSpeed = 0.; + } else if (_alpha > _alphaMax) { + _alpha = _alphaMax; + _xSpeed = 0.; + } + if (_beta < _betaMin) { + _beta = _betaMin; + _ySpeed = 0.; + } else if (_beta > _betaMax) { + _beta = _betaMax; + _ySpeed = 0.; + } + + if (_alpha >= 2. * M_PI) { + _alpha -= 2. * M_PI; + } else if (_alpha < 0.) { + _alpha += 2. * M_PI; + } + + _dirtyCoords = true; + + updateImageCoords(); +} + +void Omni3DManager::updateImageCoords() { + if (!_dirtyCoords) { + return; + } + + if (_alpha >= 2.*M_PI) { + _alpha -= 2.*M_PI; + } else if (_alpha < 0) { + _alpha += 2.*M_PI; + } + if (_beta > 0.9 * _vfov) { + _beta = 0.9 * _vfov; + } else if (_beta < -0.9 * _vfov) { + _beta = -0.9 * _vfov; + } + + double tmp = (2048 * 65536) - 2048 * 65536 / (2. * M_PI) * _alpha; + + unsigned int k = 0; + for (unsigned int i = 0; i < 31; i++) { + double v11 = _anglesH[i] + _beta; + double v26 = sin(v11); + double v25 = cos(v11) * _hypothenusesH[i]; + + unsigned int offset = 80; + unsigned int j; + for (j = 0; j < 20; j++) { + double v16 = atan2(_oppositeV[j], v25); + double v17 = v16 * _helperValue; + double v18 = (384 * 65536) - _squaresCoords[i][j] * v26; + + k += 2; + _imageCoords[k + 0] = (int)(tmp + v17); + _imageCoords[k + offset + 0] = (int)(tmp - v17); + _imageCoords[k + 1] = (int) v18; + _imageCoords[k + offset + 1] = (int) v18; + + offset -= 4; + } + + double v19 = atan2(_oppositeV[j], v25); + + k += 2; + _imageCoords[k + 0] = (int)((2048.*65536.) - (_alpha - v19) * _helperValue); + _imageCoords[k + 1] = (int)((384.*65536.) - _squaresCoords[i][j] * v26); + + k += 40; + } + + _dirtyCoords = false; + _dirty = true; +} + +const Graphics::Surface *Omni3DManager::getSurface() { + if (!_sourceSurface) { + return nullptr; + } + + if (_dirtyCoords) { + updateImageCoords(); + } + + if (_dirty) { + unsigned int off = 2; + byte *dst = (byte *)_surface.getBasePtr(0, 0); + const byte *src = (const byte *)_sourceSurface->getBasePtr(0, 0); + + for (unsigned int i = 0; i < 30; i++) { + for (unsigned int j = 0; j < 40; j++) { + int x1 = (_imageCoords[off + 2] - _imageCoords[off + 0]) >> 4; + int y1 = (_imageCoords[off + 3] - _imageCoords[off + 1]) >> 4; + int x1_ = (_imageCoords[off + 82 + 2] - _imageCoords[off + 82 + 0]) >> 4; + int y1_ = (_imageCoords[off + 82 + 3] - _imageCoords[off + 82 + 1]) >> 4; + + int dx1 = (x1_ - x1) >> 10; + int dy1 = (y1_ - y1) >> 15; + + y1 >>= 5; + + int dx2 = (_imageCoords[off + 82 + 0] - _imageCoords[off + 0]) >> 4; + int dy2 = (_imageCoords[off + 82 + 1] - _imageCoords[off + 1]) >> 9; + int x2 = (((_imageCoords[off + 0] >> 0) * 2) + dx2) >> 1; + int y2 = (((_imageCoords[off + 1] >> 5) * 2) + dy2) >> 1; + + for (unsigned int y = 0; y < 16; y++) { + unsigned int px = (x2 * 2 + x1) * 16; + unsigned int py = (y2 * 2 + y1) / 2; + unsigned int deltaX = x1 * 32; + unsigned int deltaY = y1; + + for (unsigned int x = 0; x < 16; x++) { + unsigned int srcOff = (py & 0x1ff800) | (px >> 21); + dst[x] = src[srcOff]; + px += deltaX; + py += deltaY; + } + dst += 640; + + x1 += dx1; + y1 += dy1; + x2 += dx2; + y2 += dy2; + } + dst -= 16 * 640 - 16; + off += 2; + } + dst += 15 * 640; + off += 2; + } + + _dirty = false; + } + + return &_surface; +} + +void Omni3DManager::clearConstraints() { + _alphaMin = -HUGE_VAL; + _alphaMax = HUGE_VAL; + _betaMin = -HUGE_VAL; + _betaMax = HUGE_VAL; +} + +Common::Point Omni3DManager::mapMouseCoords(const Common::Point &mouse) { + Common::Point pt; + + if (_dirtyCoords) { + updateImageCoords(); + } + + int smallX = mouse.x & 0xf, squareX = mouse.x >> 4; + int smallY = mouse.y & 0xf, squareY = mouse.y >> 4; + + unsigned int off = 82 * squareY + 2 * squareX; + + pt.x = ((_imageCoords[off + 2] + + smallY * ((_imageCoords[off + 84] - _imageCoords[off + 2]) >> 4) + + (smallX * smallY) * ((_imageCoords[off + 86] - _imageCoords[off + 84]) >> 8) + + (smallX * (16 - smallY)) * ((_imageCoords[off + 4] - _imageCoords[off + 2]) >> 8)) + & 0x07ff0000) >> 16; + pt.y = (_imageCoords[off + 3] + + smallY * ((_imageCoords[off + 85] - _imageCoords[off + 3]) >> 4) + + (smallX * smallY) * ((_imageCoords[off + 87] - _imageCoords[off + 85]) >> 8) + + (smallX * (16 - smallY)) * ((_imageCoords[off + 5] - _imageCoords[off + 3]) >> 8)) >> 16; + + return pt; +} + +} // End of namespace CryOmni3D |