| 1 | /****************************************************************************
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| 2 | **
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| 3 | ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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| 4 | ** All rights reserved.
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| 5 | ** Contact: Nokia Corporation (qt-info@nokia.com)
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| 6 | **
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| 7 | ** This file is part of the demonstration applications of the Qt Toolkit.
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| 8 | **
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| 9 | ** $QT_BEGIN_LICENSE:LGPL$
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| 10 | ** Commercial Usage
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| 11 | ** Licensees holding valid Qt Commercial licenses may use this file in
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| 12 | ** accordance with the Qt Commercial License Agreement provided with the
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| 13 | ** Software or, alternatively, in accordance with the terms contained in
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| 14 | ** a written agreement between you and Nokia.
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| 15 | **
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| 16 | ** GNU Lesser General Public License Usage
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| 17 | ** Alternatively, this file may be used under the terms of the GNU Lesser
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| 18 | ** General Public License version 2.1 as published by the Free Software
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| 19 | ** Foundation and appearing in the file LICENSE.LGPL included in the
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| 20 | ** packaging of this file. Please review the following information to
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| 21 | ** ensure the GNU Lesser General Public License version 2.1 requirements
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| 22 | ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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| 23 | **
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| 24 | ** In addition, as a special exception, Nokia gives you certain additional
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| 25 | ** rights. These rights are described in the Nokia Qt LGPL Exception
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| 26 | ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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| 27 | **
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| 28 | ** GNU General Public License Usage
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| 29 | ** Alternatively, this file may be used under the terms of the GNU
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| 30 | ** General Public License version 3.0 as published by the Free Software
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| 31 | ** Foundation and appearing in the file LICENSE.GPL included in the
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| 32 | ** packaging of this file. Please review the following information to
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| 33 | ** ensure the GNU General Public License version 3.0 requirements will be
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| 34 | ** met: http://www.gnu.org/copyleft/gpl.html.
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| 35 | **
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| 36 | ** If you have questions regarding the use of this file, please contact
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| 37 | ** Nokia at qt-info@nokia.com.
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| 38 | ** $QT_END_LICENSE$
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| 39 | **
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| 40 | ****************************************************************************/
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| 41 |
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| 42 | #include "glbuffers.h"
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| 43 | #include <QtGui/qmatrix4x4.h>
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| 44 |
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| 45 | //============================================================================//
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| 46 | // GLTexture //
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| 47 | //============================================================================//
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| 48 |
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| 49 | GLTexture::GLTexture() : m_texture(0), m_failed(false)
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| 50 | {
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| 51 | glGenTextures(1, &m_texture);
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| 52 | }
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| 53 |
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| 54 | GLTexture::~GLTexture()
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| 55 | {
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| 56 | glDeleteTextures(1, &m_texture);
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| 57 | }
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| 58 |
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| 59 | //============================================================================//
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| 60 | // GLTexture2D //
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| 61 | //============================================================================//
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| 62 |
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| 63 | GLTexture2D::GLTexture2D(int width, int height)
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| 64 | {
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| 65 | glBindTexture(GL_TEXTURE_2D, m_texture);
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| 66 | glTexImage2D(GL_TEXTURE_2D, 0, 4, width, height, 0,
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| 67 | GL_BGRA, GL_UNSIGNED_BYTE, 0);
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| 68 |
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| 69 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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| 70 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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| 71 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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| 72 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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| 73 | //glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
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| 74 | //glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
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| 75 | glBindTexture(GL_TEXTURE_2D, 0);
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| 76 | }
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| 77 |
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| 78 |
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| 79 | GLTexture2D::GLTexture2D(const QString& fileName, int width, int height)
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| 80 | {
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| 81 | // TODO: Add error handling.
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| 82 | QImage image(fileName);
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| 83 |
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| 84 | if (image.isNull()) {
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| 85 | m_failed = true;
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| 86 | return;
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| 87 | }
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| 88 |
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| 89 | image = image.convertToFormat(QImage::Format_ARGB32);
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| 90 |
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| 91 | //qDebug() << "Image size:" << image.width() << "x" << image.height();
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| 92 | if (width <= 0)
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| 93 | width = image.width();
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| 94 | if (height <= 0)
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| 95 | height = image.height();
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| 96 | if (width != image.width() || height != image.height())
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| 97 | image = image.scaled(width, height, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
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| 98 |
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| 99 | glBindTexture(GL_TEXTURE_2D, m_texture);
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| 100 |
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| 101 | // Works on x86, so probably works on all little-endian systems.
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| 102 | // Does it work on big-endian systems?
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| 103 | glTexImage2D(GL_TEXTURE_2D, 0, 4, image.width(), image.height(), 0,
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| 104 | GL_BGRA, GL_UNSIGNED_BYTE, image.bits());
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| 105 |
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| 106 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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| 107 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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| 108 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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| 109 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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| 110 | //glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
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| 111 | //glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
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| 112 | glBindTexture(GL_TEXTURE_2D, 0);
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| 113 | }
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| 114 |
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| 115 | void GLTexture2D::load(int width, int height, QRgb *data)
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| 116 | {
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| 117 | glBindTexture(GL_TEXTURE_2D, m_texture);
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| 118 | glTexImage2D(GL_TEXTURE_2D, 0, 4, width, height, 0,
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| 119 | GL_BGRA, GL_UNSIGNED_BYTE, data);
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| 120 | glBindTexture(GL_TEXTURE_2D, 0);
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| 121 | }
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| 122 |
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| 123 | void GLTexture2D::bind()
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| 124 | {
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| 125 | glBindTexture(GL_TEXTURE_2D, m_texture);
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| 126 | glEnable(GL_TEXTURE_2D);
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| 127 | }
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| 128 |
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| 129 | void GLTexture2D::unbind()
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| 130 | {
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| 131 | glBindTexture(GL_TEXTURE_2D, 0);
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| 132 | glDisable(GL_TEXTURE_2D);
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| 133 | }
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| 134 |
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| 135 |
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| 136 | //============================================================================//
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| 137 | // GLTexture3D //
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| 138 | //============================================================================//
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| 139 |
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| 140 | GLTexture3D::GLTexture3D(int width, int height, int depth)
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| 141 | {
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| 142 | GLBUFFERS_ASSERT_OPENGL("GLTexture3D::GLTexture3D", glTexImage3D, return)
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| 143 |
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| 144 | glBindTexture(GL_TEXTURE_3D, m_texture);
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| 145 | glTexImage3D(GL_TEXTURE_3D, 0, 4, width, height, depth, 0,
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| 146 | GL_BGRA, GL_UNSIGNED_BYTE, 0);
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| 147 |
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| 148 | glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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| 149 | glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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| 150 | glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_REPEAT);
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| 151 | glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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| 152 | glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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| 153 | //glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
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| 154 | //glTexParameteri(GL_TEXTURE_3D, GL_GENERATE_MIPMAP, GL_TRUE);
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| 155 | glBindTexture(GL_TEXTURE_3D, 0);
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| 156 | }
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| 157 |
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| 158 | void GLTexture3D::load(int width, int height, int depth, QRgb *data)
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| 159 | {
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| 160 | GLBUFFERS_ASSERT_OPENGL("GLTexture3D::load", glTexImage3D, return)
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| 161 |
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| 162 | glBindTexture(GL_TEXTURE_3D, m_texture);
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| 163 | glTexImage3D(GL_TEXTURE_3D, 0, 4, width, height, depth, 0,
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| 164 | GL_BGRA, GL_UNSIGNED_BYTE, data);
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| 165 | glBindTexture(GL_TEXTURE_3D, 0);
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| 166 | }
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| 167 |
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| 168 | void GLTexture3D::bind()
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| 169 | {
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| 170 | glBindTexture(GL_TEXTURE_3D, m_texture);
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| 171 | glEnable(GL_TEXTURE_3D);
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| 172 | }
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| 173 |
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| 174 | void GLTexture3D::unbind()
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| 175 | {
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| 176 | glBindTexture(GL_TEXTURE_3D, 0);
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| 177 | glDisable(GL_TEXTURE_3D);
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| 178 | }
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| 179 |
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| 180 | //============================================================================//
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| 181 | // GLTextureCube //
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| 182 | //============================================================================//
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| 183 |
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| 184 | GLTextureCube::GLTextureCube(int size)
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| 185 | {
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| 186 | glBindTexture(GL_TEXTURE_CUBE_MAP, m_texture);
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| 187 |
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| 188 | for (int i = 0; i < 6; ++i)
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| 189 | glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, 4, size, size, 0,
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| 190 | GL_BGRA, GL_UNSIGNED_BYTE, 0);
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| 191 |
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| 192 | glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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| 193 | glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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| 194 | glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
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| 195 | glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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| 196 | glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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| 197 | //glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
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| 198 | //glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_GENERATE_MIPMAP, GL_TRUE);
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| 199 | glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
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| 200 | }
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| 201 |
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| 202 | GLTextureCube::GLTextureCube(const QStringList& fileNames, int size)
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| 203 | {
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| 204 | // TODO: Add error handling.
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| 205 |
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| 206 | glBindTexture(GL_TEXTURE_CUBE_MAP, m_texture);
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| 207 |
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| 208 | int index = 0;
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| 209 | foreach (QString file, fileNames) {
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| 210 | QImage image(file);
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| 211 | if (image.isNull()) {
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| 212 | m_failed = true;
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| 213 | break;
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| 214 | }
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| 215 |
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| 216 | image = image.convertToFormat(QImage::Format_ARGB32);
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| 217 |
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| 218 | //qDebug() << "Image size:" << image.width() << "x" << image.height();
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| 219 | if (size <= 0)
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| 220 | size = image.width();
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| 221 | if (size != image.width() || size != image.height())
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| 222 | image = image.scaled(size, size, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
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| 223 |
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| 224 | // Works on x86, so probably works on all little-endian systems.
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| 225 | // Does it work on big-endian systems?
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| 226 | glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + index, 0, 4, image.width(), image.height(), 0,
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| 227 | GL_BGRA, GL_UNSIGNED_BYTE, image.bits());
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| 228 |
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| 229 | if (++index == 6)
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| 230 | break;
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| 231 | }
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| 232 |
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| 233 | // Clear remaining faces.
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| 234 | while (index < 6) {
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| 235 | glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + index, 0, 4, size, size, 0,
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| 236 | GL_BGRA, GL_UNSIGNED_BYTE, 0);
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| 237 | ++index;
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| 238 | }
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| 239 |
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| 240 | glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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| 241 | glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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| 242 | glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
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| 243 | glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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| 244 | glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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| 245 | //glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
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| 246 | //glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_GENERATE_MIPMAP, GL_TRUE);
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| 247 | glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
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| 248 | }
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| 249 |
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| 250 | void GLTextureCube::load(int size, int face, QRgb *data)
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| 251 | {
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| 252 | glBindTexture(GL_TEXTURE_CUBE_MAP, m_texture);
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| 253 | glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, 0, 4, size, size, 0,
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| 254 | GL_BGRA, GL_UNSIGNED_BYTE, data);
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| 255 | glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
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| 256 | }
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| 257 |
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| 258 | void GLTextureCube::bind()
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| 259 | {
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| 260 | glBindTexture(GL_TEXTURE_CUBE_MAP, m_texture);
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| 261 | glEnable(GL_TEXTURE_CUBE_MAP);
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| 262 | }
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| 263 |
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| 264 | void GLTextureCube::unbind()
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| 265 | {
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| 266 | glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
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| 267 | glDisable(GL_TEXTURE_CUBE_MAP);
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| 268 | }
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| 269 |
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| 270 | //============================================================================//
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| 271 | // GLFrameBufferObject //
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| 272 | //============================================================================//
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| 273 |
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| 274 | GLFrameBufferObject::GLFrameBufferObject(int width, int height)
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| 275 | : m_fbo(0)
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| 276 | , m_depthBuffer(0)
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| 277 | , m_width(width)
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| 278 | , m_height(height)
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| 279 | , m_failed(false)
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| 280 | {
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| 281 | GLBUFFERS_ASSERT_OPENGL("GLFrameBufferObject::GLFrameBufferObject",
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| 282 | glGenFramebuffersEXT && glGenRenderbuffersEXT && glBindRenderbufferEXT && glRenderbufferStorageEXT, return)
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| 283 |
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| 284 | // TODO: share depth buffers of same size
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| 285 | glGenFramebuffersEXT(1, &m_fbo);
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| 286 | //glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, m_fbo);
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| 287 | glGenRenderbuffersEXT(1, &m_depthBuffer);
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| 288 | glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, m_depthBuffer);
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| 289 | glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT, m_width, m_height);
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| 290 | //glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, m_depthBuffer);
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| 291 | //glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
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| 292 | }
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| 293 |
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| 294 | GLFrameBufferObject::~GLFrameBufferObject()
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| 295 | {
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| 296 | GLBUFFERS_ASSERT_OPENGL("GLFrameBufferObject::~GLFrameBufferObject",
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| 297 | glDeleteFramebuffersEXT && glDeleteRenderbuffersEXT, return)
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| 298 |
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| 299 | glDeleteFramebuffersEXT(1, &m_fbo);
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| 300 | glDeleteRenderbuffersEXT(1, &m_depthBuffer);
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| 301 | }
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| 302 |
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| 303 | void GLFrameBufferObject::setAsRenderTarget(bool state)
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| 304 | {
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| 305 | GLBUFFERS_ASSERT_OPENGL("GLFrameBufferObject::setAsRenderTarget", glBindFramebufferEXT, return)
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| 306 |
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| 307 | if (state) {
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| 308 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, m_fbo);
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| 309 | glPushAttrib(GL_VIEWPORT_BIT);
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| 310 | glViewport(0, 0, m_width, m_height);
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| 311 | } else {
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| 312 | glPopAttrib();
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| 313 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
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| 314 | }
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| 315 | }
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| 316 |
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| 317 | bool GLFrameBufferObject::isComplete()
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| 318 | {
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| 319 | GLBUFFERS_ASSERT_OPENGL("GLFrameBufferObject::isComplete", glCheckFramebufferStatusEXT, return false)
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| 320 |
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| 321 | return GL_FRAMEBUFFER_COMPLETE_EXT == glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
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| 322 | }
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| 323 |
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| 324 | //============================================================================//
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| 325 | // GLRenderTargetCube //
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| 326 | //============================================================================//
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| 327 |
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| 328 | GLRenderTargetCube::GLRenderTargetCube(int size)
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| 329 | : GLTextureCube(size)
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| 330 | , m_fbo(size, size)
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| 331 | {
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| 332 | }
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| 333 |
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| 334 | void GLRenderTargetCube::begin(int face)
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| 335 | {
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| 336 | GLBUFFERS_ASSERT_OPENGL("GLRenderTargetCube::begin",
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| 337 | glFramebufferTexture2DEXT && glFramebufferRenderbufferEXT, return)
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| 338 |
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| 339 | m_fbo.setAsRenderTarget(true);
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| 340 | glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
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| 341 | GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, m_texture, 0);
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| 342 | glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, m_fbo.m_depthBuffer);
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| 343 | }
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| 344 |
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| 345 | void GLRenderTargetCube::end()
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| 346 | {
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| 347 | m_fbo.setAsRenderTarget(false);
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| 348 | }
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| 349 |
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| 350 | void GLRenderTargetCube::getViewMatrix(QMatrix4x4& mat, int face)
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| 351 | {
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| 352 | if (face < 0 || face >= 6) {
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| 353 | qWarning("GLRenderTargetCube::getViewMatrix: 'face' must be in the range [0, 6). (face == %d)", face);
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| 354 | return;
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| 355 | }
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| 356 |
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| 357 | static int perm[6][3] = {
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| 358 | {2, 1, 0},
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| 359 | {2, 1, 0},
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| 360 | {0, 2, 1},
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| 361 | {0, 2, 1},
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| 362 | {0, 1, 2},
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| 363 | {0, 1, 2},
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| 364 | };
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| 365 |
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| 366 | static float signs[6][3] = {
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| 367 | {-1.0f, -1.0f, -1.0f},
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| 368 | {+1.0f, -1.0f, +1.0f},
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| 369 | {+1.0f, +1.0f, -1.0f},
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| 370 | {+1.0f, -1.0f, +1.0f},
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| 371 | {+1.0f, -1.0f, -1.0f},
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| 372 | {-1.0f, -1.0f, +1.0f},
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| 373 | };
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| 374 |
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| 375 | mat.fill(0.0f);
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| 376 | for (int i = 0; i < 3; ++i)
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| 377 | mat(i, perm[face][i]) = signs[face][i];
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| 378 | mat(3, 3) = 1.0f;
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| 379 | }
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| 380 |
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| 381 | void GLRenderTargetCube::getProjectionMatrix(QMatrix4x4& mat, float nearZ, float farZ)
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| 382 | {
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| 383 | static const QMatrix4x4 reference(
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| 384 | 1.0f, 0.0f, 0.0f, 0.0f,
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| 385 | 0.0f, 1.0f, 0.0f, 0.0f,
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| 386 | 0.0f, 0.0f, 0.0f, 0.0f,
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| 387 | 0.0f, 0.0f, -1.0f, 0.0f);
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| 388 |
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| 389 | mat = reference;
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| 390 | mat(2, 2) = (nearZ+farZ)/(nearZ-farZ);
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| 391 | mat(2, 3) = 2.0f*nearZ*farZ/(nearZ-farZ);
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| 392 | }
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