38be0d1383
This is the beginning of revision history for this module. If you want to look at revision history older than this, please refer to the Qt Git wiki for how to use Git history grafting. At the time of writing, this wiki is located here: http://qt.gitorious.org/qt/pages/GitIntroductionWithQt If you have already performed the grafting and you don't see any history beyond this commit, try running "git log" with the "--follow" argument. Branched from the monolithic repo, Qt master branch, at commit 896db169ea224deb96c59ce8af800d019de63f12
392 lines
12 KiB
C++
392 lines
12 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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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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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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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 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt 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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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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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 <QtGui>
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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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#elif defined(Q_OS_SYMBIAN)
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// FIXME: use HAL
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if (width() > 480 || height() > 480)
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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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#if defined(Q_OS_SYMBIAN) || defined(Q_OS_WINCE_WM)
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w.showMaximized();
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#else
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w.resize(640, 480);
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w.show();
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#endif
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return app.exec();
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}
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