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| -rw-r--r-- | engines/zvision/render_table.cpp | 95 | ||||
| -rw-r--r-- | engines/zvision/render_table.h | 69 |
2 files changed, 164 insertions, 0 deletions
diff --git a/engines/zvision/render_table.cpp b/engines/zvision/render_table.cpp new file mode 100644 index 0000000000..1baf9514a3 --- /dev/null +++ b/engines/zvision/render_table.cpp @@ -0,0 +1,95 @@ +/* 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 "common/scummsys.h" + +#include "zvision/render_table.h" + + +namespace ZVision { + +RenderTable::RenderTable(uint32 numRows, uint32 numColumns) + : _numRows(numRows), + _numColumns(numColumns) { + assert(numRows != 0 && numColumns != 0); + + _internalBuffer = new Common::Point[numRows * numColumns]; +} + +RenderTable::~RenderTable() { + delete[] _internalBuffer; +} + +void RenderTable::setRenderState(RenderState newState) { + _renderState = newState; + + switch (newState) { + case PANORAMA: + _panoramaOptions.fieldOfView = 60; + _panoramaOptions.linearScale = 1; + generatePanoramaLookupTable(); + break; + case TILT: + generateTiltLookupTable(); + break; + case FLAT: + // Intentionally left empty + break; + } +} + +void RenderTable::generatePanoramaLookupTable() { + float fieldOfView = _panoramaOptions.fieldOfView; + float scale = _panoramaOptions.linearScale; + + memset(_internalBuffer, 0, _numRows * _numColumns * sizeof(uint16)); + + float halfWidth = (float)_numColumns / 2.0f; + float halfHeight = (float)_numRows / 2.0f; + + float fovRadians = (fieldOfView * M_PI / 180.0f); + float halfHeightOverTan = halfHeight / tan(fovRadians); + float tanOverHalfHeight = tan(fovRadians) / halfHeight; + + for (uint32 x = 0; x < _numRows; x++) { + // Add an offset of 0.01 to overcome zero tan/atan issue (vertical line on half of screen) + float xPos = (float)x - halfWidth + 0.01; + float tempX = atan(xPos*tanOverHalfHeight); + + int32 newX = floor(scale * halfHeightOverTan * tempX);// + half_w); + float cosX = cos(tempX); + + for (uint32 y = 0; y < _numColumns; y++) { + int32 newY = floor(halfHeight + (y - halfHeight) * cosX); + + uint32 index = x * _numColumns + y; + _internalBuffer[index].x = newX; //pixel index + _internalBuffer[index].y = newY; //pixel index + } + } +} + +void RenderTable::generateTiltLookupTable() { + +} + +} // End of namespace ZVision diff --git a/engines/zvision/render_table.h b/engines/zvision/render_table.h new file mode 100644 index 0000000000..9d54551c3b --- /dev/null +++ b/engines/zvision/render_table.h @@ -0,0 +1,69 @@ +/* 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. + * + */ + +#ifndef ZVISION_RENDER_TABLE_H +#define ZVISION_RENDER_TABLE_H + +#include "common/types.h" +#include "common/rect.h" + +namespace ZVision { + +class RenderTable { +public: + RenderTable(uint32 numRows, uint32 numColumns); + ~RenderTable(); + +public: + enum RenderState { + PANORAMA, + TILT, + FLAT + }; + +private: + uint32 _numColumns, _numRows; + Common::Point *_internalBuffer; + RenderState _renderState; + + struct { + uint16 fieldOfView; + uint16 linearScale; + } _panoramaOptions; + + // TODO: See if tilt and panorama need to have separate options + struct { + uint16 fieldOfView; + uint16 linearScale; + } _tiltOptions; + +public: + void setRenderState(RenderState newState); + +private: + void generatePanoramaLookupTable(); + void generateTiltLookupTable(); +}; + +} // End of namesapce ZVision + +#endif |