83a5694dc2
Qt copyrights are now in The Qt Company, so we could update the source code headers accordingly. In the same go we should also fix the links to point to qt.io. Outdated header.LGPL removed (use header.LGPL21 instead) Old header.LGPL3 renamed to header.LGPL3-COMM to match actual licensing combination. New header.LGPL-COMM taken in the use file which were using old header.LGPL3 (src/plugins/platforms/android/extract.cpp) Added new header.LGPL3 containing Commercial + LGPLv3 + GPLv2 license combination Change-Id: I6f49b819a8a20cc4f88b794a8f6726d975e8ffbe Reviewed-by: Matti Paaso <matti.paaso@theqtcompany.com>
376 lines
12 KiB
C++
376 lines
12 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the demonstration applications of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL21$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see http://www.qt.io/terms-conditions. For further
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** information use the contact form at http://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 or version 3 as published by the Free
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** Software Foundation and appearing in the file LICENSE.LGPLv21 and
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** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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** following information to ensure the GNU Lesser General Public License
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** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** As a special exception, The Qt Company gives you certain additional
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** rights. These rights are described in The Qt Company LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QtCore>
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#include <QtWidgets>
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#include <math.h>
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif
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#define WORLD_SIZE 8
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int world_map[WORLD_SIZE][WORLD_SIZE] = {
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{ 1, 1, 1, 1, 6, 1, 1, 1 },
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{ 1, 0, 0, 1, 0, 0, 0, 7 },
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{ 1, 1, 0, 1, 0, 1, 1, 1 },
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{ 6, 0, 0, 0, 0, 0, 0, 3 },
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{ 1, 8, 8, 0, 8, 0, 8, 1 },
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{ 2, 2, 0, 0, 8, 8, 7, 1 },
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{ 3, 0, 0, 0, 0, 0, 0, 5 },
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{ 2, 2, 2, 2, 7, 4, 4, 4 },
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};
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#define TEXTURE_SIZE 64
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#define TEXTURE_BLOCK (TEXTURE_SIZE * TEXTURE_SIZE)
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class Raycasting: public QWidget
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{
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public:
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Raycasting(QWidget *parent = 0)
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: QWidget(parent)
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, angle(0.5)
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, playerPos(1.5, 1.5)
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, angleDelta(0)
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, moveDelta(0)
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, touchDevice(false) {
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// http://www.areyep.com/RIPandMCS-TextureLibrary.html
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textureImg.load(":/textures.png");
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textureImg = textureImg.convertToFormat(QImage::Format_ARGB32);
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Q_ASSERT(textureImg.width() == TEXTURE_SIZE * 2);
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Q_ASSERT(textureImg.bytesPerLine() == 4 * TEXTURE_SIZE * 2);
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textureCount = textureImg.height() / TEXTURE_SIZE;
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watch.start();
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ticker.start(25, this);
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setAttribute(Qt::WA_OpaquePaintEvent, true);
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setMouseTracking(false);
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}
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void updatePlayer() {
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int interval = qBound(20, watch.elapsed(), 250);
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watch.start();
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angle += angleDelta * interval / 1000;
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qreal step = moveDelta * interval / 1000;
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qreal dx = cos(angle) * step;
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qreal dy = sin(angle) * step;
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QPointF pos = playerPos + 3 * QPointF(dx, dy);
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int xi = static_cast<int>(pos.x());
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int yi = static_cast<int>(pos.y());
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if (world_map[yi][xi] == 0)
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playerPos = playerPos + QPointF(dx, dy);
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}
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void showFps() {
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static QTime frameTick;
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static int totalFrame = 0;
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if (!(totalFrame & 31)) {
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int elapsed = frameTick.elapsed();
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frameTick.start();
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int fps = 32 * 1000 / (1 + elapsed);
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setWindowTitle(QString("Raycasting (%1 FPS)").arg(fps));
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}
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totalFrame++;
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}
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void render() {
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// setup the screen surface
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if (buffer.size() != bufferSize)
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buffer = QImage(bufferSize, QImage::Format_ARGB32);
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int bufw = buffer.width();
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int bufh = buffer.height();
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if (bufw <= 0 || bufh <= 0)
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return;
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// we intentionally cheat here, to avoid detach
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const uchar *ptr = buffer.bits();
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QRgb *start = (QRgb*)(ptr);
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QRgb stride = buffer.bytesPerLine() / 4;
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QRgb *finish = start + stride * bufh;
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// prepare the texture pointer
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const uchar *src = textureImg.bits();
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const QRgb *texsrc = reinterpret_cast<const QRgb*>(src);
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// cast all rays here
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qreal sina = sin(angle);
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qreal cosa = cos(angle);
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qreal u = cosa - sina;
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qreal v = sina + cosa;
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qreal du = 2 * sina / bufw;
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qreal dv = -2 * cosa / bufw;
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for (int ray = 0; ray < bufw; ++ray, u += du, v += dv) {
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// every time this ray advances 'u' units in x direction,
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// it also advanced 'v' units in y direction
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qreal uu = (u < 0) ? -u : u;
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qreal vv = (v < 0) ? -v : v;
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qreal duu = 1 / uu;
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qreal dvv = 1 / vv;
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int stepx = (u < 0) ? -1 : 1;
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int stepy = (v < 0) ? -1 : 1;
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// the cell in the map that we need to check
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qreal px = playerPos.x();
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qreal py = playerPos.y();
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int mapx = static_cast<int>(px);
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int mapy = static_cast<int>(py);
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// the position and texture for the hit
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int texture = 0;
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qreal hitdist = 0.1;
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qreal texofs = 0;
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bool dark = false;
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// first hit at constant x and constant y lines
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qreal distx = (u > 0) ? (mapx + 1 - px) * duu : (px - mapx) * duu;
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qreal disty = (v > 0) ? (mapy + 1 - py) * dvv : (py - mapy) * dvv;
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// loop until we hit something
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while (texture <= 0) {
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if (distx > disty) {
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// shorter distance to a hit in constant y line
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hitdist = disty;
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disty += dvv;
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mapy += stepy;
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texture = world_map[mapy][mapx];
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if (texture > 0) {
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dark = true;
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if (stepy > 0) {
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qreal ofs = px + u * (mapy - py) / v;
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texofs = ofs - floor(ofs);
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} else {
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qreal ofs = px + u * (mapy + 1 - py) / v;
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texofs = ofs - floor(ofs);
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}
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}
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} else {
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// shorter distance to a hit in constant x line
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hitdist = distx;
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distx += duu;
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mapx += stepx;
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texture = world_map[mapy][mapx];
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if (texture > 0) {
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if (stepx > 0) {
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qreal ofs = py + v * (mapx - px) / u;
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texofs = ofs - floor(ofs);
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} else {
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qreal ofs = py + v * (mapx + 1 - px) / u;
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texofs = ceil(ofs) - ofs;
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}
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}
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}
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}
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// get the texture, note that the texture image
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// has two textures horizontally, "normal" vs "dark"
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int col = static_cast<int>(texofs * TEXTURE_SIZE);
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col = qBound(0, col, TEXTURE_SIZE - 1);
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texture = (texture - 1) % textureCount;
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const QRgb *tex = texsrc + TEXTURE_BLOCK * texture * 2 +
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(TEXTURE_SIZE * 2 * col);
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if (dark)
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tex += TEXTURE_SIZE;
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// start from the texture center (horizontally)
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int h = static_cast<int>(bufw / hitdist / 2);
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int dy = (TEXTURE_SIZE << 12) / h;
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int p1 = ((TEXTURE_SIZE / 2) << 12) - dy;
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int p2 = p1 + dy;
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// start from the screen center (vertically)
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// y1 will go up (decrease), y2 will go down (increase)
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int y1 = bufh / 2;
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int y2 = y1 + 1;
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QRgb *pixel1 = start + y1 * stride + ray;
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QRgb *pixel2 = pixel1 + stride;
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// map the texture to the sliver
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while (y1 >= 0 && y2 < bufh && p1 >= 0) {
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*pixel1 = tex[p1 >> 12];
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*pixel2 = tex[p2 >> 12];
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p1 -= dy;
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p2 += dy;
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--y1;
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++y2;
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pixel1 -= stride;
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pixel2 += stride;
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}
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// ceiling and floor
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for (; pixel1 > start; pixel1 -= stride)
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*pixel1 = qRgb(0, 0, 0);
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for (; pixel2 < finish; pixel2 += stride)
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*pixel2 = qRgb(96, 96, 96);
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}
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update(QRect(QPoint(0, 0), bufferSize));
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}
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protected:
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void resizeEvent(QResizeEvent*) {
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#if defined(Q_OS_WINCE_WM)
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touchDevice = true;
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#else
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touchDevice = false;
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#endif
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if (touchDevice) {
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if (width() < height()) {
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trackPad = QRect(0, height() / 2, width(), height() / 2);
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centerPad = QPoint(width() / 2, height() * 3 / 4);
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bufferSize = QSize(width(), height() / 2);
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} else {
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trackPad = QRect(width() / 2, 0, width() / 2, height());
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centerPad = QPoint(width() * 3 / 4, height() / 2);
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bufferSize = QSize(width() / 2, height());
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}
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} else {
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trackPad = QRect();
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bufferSize = size();
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}
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update();
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}
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void timerEvent(QTimerEvent*) {
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updatePlayer();
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render();
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showFps();
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}
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void paintEvent(QPaintEvent *event) {
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QPainter p(this);
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p.setCompositionMode(QPainter::CompositionMode_Source);
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p.drawImage(event->rect(), buffer, event->rect());
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if (touchDevice && event->rect().intersects(trackPad)) {
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p.fillRect(trackPad, Qt::white);
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p.setPen(QPen(QColor(224, 224, 224), 6));
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int rad = qMin(trackPad.width(), trackPad.height()) * 0.3;
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p.drawEllipse(centerPad, rad, rad);
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p.setPen(Qt::NoPen);
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p.setBrush(Qt::gray);
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QPolygon poly;
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poly << QPoint(-30, 0);
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poly << QPoint(0, -40);
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poly << QPoint(30, 0);
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p.translate(centerPad);
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for (int i = 0; i < 4; ++i) {
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p.rotate(90);
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p.translate(0, 20 - rad);
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p.drawPolygon(poly);
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p.translate(0, rad - 20);
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}
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}
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p.end();
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}
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void keyPressEvent(QKeyEvent *event) {
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event->accept();
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if (event->key() == Qt::Key_Left)
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angleDelta = 1.3 * M_PI;
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if (event->key() == Qt::Key_Right)
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angleDelta = -1.3 * M_PI;
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if (event->key() == Qt::Key_Up)
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moveDelta = 2.5;
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if (event->key() == Qt::Key_Down)
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moveDelta = -2.5;
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}
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void keyReleaseEvent(QKeyEvent *event) {
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event->accept();
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if (event->key() == Qt::Key_Left)
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angleDelta = (angleDelta > 0) ? 0 : angleDelta;
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if (event->key() == Qt::Key_Right)
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angleDelta = (angleDelta < 0) ? 0 : angleDelta;
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if (event->key() == Qt::Key_Up)
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moveDelta = (moveDelta > 0) ? 0 : moveDelta;
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if (event->key() == Qt::Key_Down)
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moveDelta = (moveDelta < 0) ? 0 : moveDelta;
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}
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void mousePressEvent(QMouseEvent *event) {
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qreal dx = centerPad.x() - event->pos().x();
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qreal dy = centerPad.y() - event->pos().y();
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angleDelta = dx * 2 * M_PI / width();
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moveDelta = dy * 10 / height();
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}
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void mouseMoveEvent(QMouseEvent *event) {
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qreal dx = centerPad.x() - event->pos().x();
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qreal dy = centerPad.y() - event->pos().y();
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angleDelta = dx * 2 * M_PI / width();
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moveDelta = dy * 10 / height();
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}
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void mouseReleaseEvent(QMouseEvent*) {
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angleDelta = 0;
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moveDelta = 0;
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}
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private:
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QTime watch;
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QBasicTimer ticker;
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QImage buffer;
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qreal angle;
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QPointF playerPos;
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qreal angleDelta;
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qreal moveDelta;
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QImage textureImg;
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int textureCount;
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bool touchDevice;
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QRect trackPad;
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QPoint centerPad;
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QSize bufferSize;
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};
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int main(int argc, char **argv)
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{
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QApplication app(argc, argv);
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Raycasting w;
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w.setWindowTitle("Raycasting");
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w.resize(640, 480);
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w.show();
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return app.exec();
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}
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