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Diffstat (limited to 'examples/graphicsview/boxes/roundedbox.cpp')
| -rw-r--r-- | examples/graphicsview/boxes/roundedbox.cpp | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/examples/graphicsview/boxes/roundedbox.cpp b/examples/graphicsview/boxes/roundedbox.cpp new file mode 100644 index 0000000000..5058043707 --- /dev/null +++ b/examples/graphicsview/boxes/roundedbox.cpp @@ -0,0 +1,161 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the demonstration applications of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** This file may be used under the terms of the GNU Lesser General Public +** License version 2.1 as published by the Free Software Foundation and +** appearing in the file LICENSE.LGPL included in the packaging of this +** file. Please review the following information to ensure the GNU Lesser +** General Public License version 2.1 requirements will be met: +** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU General +** Public License version 3.0 as published by the Free Software Foundation +** and appearing in the file LICENSE.GPL included in the packaging of this +** file. Please review the following information to ensure the GNU General +** Public License version 3.0 requirements will be met: +** http://www.gnu.org/copyleft/gpl.html. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "roundedbox.h" + +//============================================================================// +// P3T2N3Vertex // +//============================================================================// + +VertexDescription P3T2N3Vertex::description[] = { + {VertexDescription::Position, GL_FLOAT, SIZE_OF_MEMBER(P3T2N3Vertex, position) / sizeof(float), 0, 0}, + {VertexDescription::TexCoord, GL_FLOAT, SIZE_OF_MEMBER(P3T2N3Vertex, texCoord) / sizeof(float), sizeof(QVector3D), 0}, + {VertexDescription::Normal, GL_FLOAT, SIZE_OF_MEMBER(P3T2N3Vertex, normal) / sizeof(float), sizeof(QVector3D) + sizeof(QVector2D), 0}, + + {VertexDescription::Null, 0, 0, 0, 0}, +}; + +//============================================================================// +// GLRoundedBox // +//============================================================================// + +float lerp(float a, float b, float t) +{ + return a * (1.0f - t) + b * t; +} + +GLRoundedBox::GLRoundedBox(float r, float scale, int n) + : GLTriangleMesh<P3T2N3Vertex, unsigned short>((n+2)*(n+3)*4, (n+1)*(n+1)*24+36+72*(n+1)) +{ + int vidx = 0, iidx = 0; + int vertexCountPerCorner = (n + 2) * (n + 3) / 2; + + P3T2N3Vertex *vp = m_vb.lock(); + unsigned short *ip = m_ib.lock(); + + if (!vp || !ip) { + qWarning("GLRoundedBox::GLRoundedBox: Failed to lock vertex buffer and/or index buffer."); + m_ib.unlock(); + m_vb.unlock(); + return; + } + + for (int corner = 0; corner < 8; ++corner) { + QVector3D centre(corner & 1 ? 1.0f : -1.0f, + corner & 2 ? 1.0f : -1.0f, + corner & 4 ? 1.0f : -1.0f); + int winding = (corner & 1) ^ ((corner >> 1) & 1) ^ (corner >> 2); + int offsX = ((corner ^ 1) - corner) * vertexCountPerCorner; + int offsY = ((corner ^ 2) - corner) * vertexCountPerCorner; + int offsZ = ((corner ^ 4) - corner) * vertexCountPerCorner; + + // Face polygons + if (winding) { + ip[iidx++] = vidx; + ip[iidx++] = vidx + offsX; + ip[iidx++] = vidx + offsY; + + ip[iidx++] = vidx + vertexCountPerCorner - n - 2; + ip[iidx++] = vidx + vertexCountPerCorner - n - 2 + offsY; + ip[iidx++] = vidx + vertexCountPerCorner - n - 2 + offsZ; + + ip[iidx++] = vidx + vertexCountPerCorner - 1; + ip[iidx++] = vidx + vertexCountPerCorner - 1 + offsZ; + ip[iidx++] = vidx + vertexCountPerCorner - 1 + offsX; + } + + for (int i = 0; i < n + 2; ++i) { + + // Edge polygons + if (winding && i < n + 1) { + ip[iidx++] = vidx + i + 1; + ip[iidx++] = vidx; + ip[iidx++] = vidx + offsY + i + 1; + ip[iidx++] = vidx + offsY; + ip[iidx++] = vidx + offsY + i + 1; + ip[iidx++] = vidx; + + ip[iidx++] = vidx + i; + ip[iidx++] = vidx + 2 * i + 2; + ip[iidx++] = vidx + i + offsX; + ip[iidx++] = vidx + 2 * i + offsX + 2; + ip[iidx++] = vidx + i + offsX; + ip[iidx++] = vidx + 2 * i + 2; + + ip[iidx++] = (corner + 1) * vertexCountPerCorner - 1 - i; + ip[iidx++] = (corner + 1) * vertexCountPerCorner - 2 - i; + ip[iidx++] = (corner + 1) * vertexCountPerCorner - 1 - i + offsZ; + ip[iidx++] = (corner + 1) * vertexCountPerCorner - 2 - i + offsZ; + ip[iidx++] = (corner + 1) * vertexCountPerCorner - 1 - i + offsZ; + ip[iidx++] = (corner + 1) * vertexCountPerCorner - 2 - i; + } + + for (int j = 0; j <= i; ++j) { + QVector3D normal = QVector3D(i - j, j, n + 1 - i).normalized(); + QVector3D offset(0.5f - r, 0.5f - r, 0.5f - r); + QVector3D pos = centre * (offset + r * normal); + + vp[vidx].position = scale * pos; + vp[vidx].normal = centre * normal; + vp[vidx].texCoord = QVector2D(pos.x() + 0.5f, pos.y() + 0.5f); + + // Corner polygons + if (i < n + 1) { + ip[iidx++] = vidx; + ip[iidx++] = vidx + i + 2 - winding; + ip[iidx++] = vidx + i + 1 + winding; + } + if (i < n) { + ip[iidx++] = vidx + i + 1 + winding; + ip[iidx++] = vidx + i + 2 - winding; + ip[iidx++] = vidx + 2 * i + 4; + } + + ++vidx; + } + } + + } + + m_ib.unlock(); + m_vb.unlock(); +} + |