96 lines
2.7 KiB
C++
96 lines
2.7 KiB
C++
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/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "common/scummsys.h"
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#include "zvision/render_table.h"
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namespace ZVision {
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RenderTable::RenderTable(uint32 numRows, uint32 numColumns)
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: _numRows(numRows),
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_numColumns(numColumns) {
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assert(numRows != 0 && numColumns != 0);
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_internalBuffer = new Common::Point[numRows * numColumns];
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}
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RenderTable::~RenderTable() {
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delete[] _internalBuffer;
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}
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void RenderTable::setRenderState(RenderState newState) {
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_renderState = newState;
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switch (newState) {
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case PANORAMA:
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_panoramaOptions.fieldOfView = 60;
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_panoramaOptions.linearScale = 1;
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generatePanoramaLookupTable();
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break;
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case TILT:
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generateTiltLookupTable();
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break;
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case FLAT:
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// Intentionally left empty
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break;
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}
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}
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void RenderTable::generatePanoramaLookupTable() {
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float fieldOfView = _panoramaOptions.fieldOfView;
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float scale = _panoramaOptions.linearScale;
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memset(_internalBuffer, 0, _numRows * _numColumns * sizeof(uint16));
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float halfWidth = (float)_numColumns / 2.0f;
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float halfHeight = (float)_numRows / 2.0f;
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float fovRadians = (fieldOfView * M_PI / 180.0f);
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float halfHeightOverTan = halfHeight / tan(fovRadians);
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float tanOverHalfHeight = tan(fovRadians) / halfHeight;
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for (uint32 x = 0; x < _numRows; x++) {
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// Add an offset of 0.01 to overcome zero tan/atan issue (vertical line on half of screen)
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float xPos = (float)x - halfWidth + 0.01;
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float tempX = atan(xPos*tanOverHalfHeight);
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int32 newX = floor(scale * halfHeightOverTan * tempX);// + half_w);
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float cosX = cos(tempX);
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for (uint32 y = 0; y < _numColumns; y++) {
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int32 newY = floor(halfHeight + (y - halfHeight) * cosX);
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uint32 index = x * _numColumns + y;
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_internalBuffer[index].x = newX; //pixel index
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_internalBuffer[index].y = newY; //pixel index
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}
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}
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}
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void RenderTable::generateTiltLookupTable() {
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}
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} // End of namespace ZVision
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