From 15e58df3386b5438f6ae114a51ad4a258085e70b Mon Sep 17 00:00:00 2001 From: Gunnar Sletta Date: Wed, 27 Feb 2013 08:44:47 +0100 Subject: Added examples on how to use FBOs with scene graph. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit I also cleaned up the naming of the other scene graph examples a bit, so that they sort together in the samples list and have a more obvious naming scheme. Task-number: QTBUG-29548 Change-Id: I455eacb02c06058a6d49e12e4f1813ec80b655f6 Reviewed-by: Samuel Rødal --- examples/quick/scenegraph/shared/logorenderer.cpp | 258 ++++++++++++++++++++++ examples/quick/scenegraph/shared/logorenderer.h | 77 +++++++ 2 files changed, 335 insertions(+) create mode 100644 examples/quick/scenegraph/shared/logorenderer.cpp create mode 100644 examples/quick/scenegraph/shared/logorenderer.h (limited to 'examples/quick/scenegraph/shared') diff --git a/examples/quick/scenegraph/shared/logorenderer.cpp b/examples/quick/scenegraph/shared/logorenderer.cpp new file mode 100644 index 0000000000..4c5927b543 --- /dev/null +++ b/examples/quick/scenegraph/shared/logorenderer.cpp @@ -0,0 +1,258 @@ +/**************************************************************************** +** +** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** You may use this file under the terms of the BSD license as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names +** of its contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "logorenderer.h" +#include +#include +#include + +LogoRenderer::LogoRenderer() +{ +} + +LogoRenderer::~LogoRenderer() +{ +} + + +void LogoRenderer::paintQtLogo() +{ + program1.enableAttributeArray(normalAttr1); + program1.enableAttributeArray(vertexAttr1); + program1.setAttributeArray(vertexAttr1, vertices.constData()); + program1.setAttributeArray(normalAttr1, normals.constData()); + glDrawArrays(GL_TRIANGLES, 0, vertices.size()); + program1.disableAttributeArray(normalAttr1); + program1.disableAttributeArray(vertexAttr1); +} + + +void LogoRenderer::initialize() +{ + glClearColor(0.1f, 0.1f, 0.2f, 1.0f); + + QOpenGLShader *vshader1 = new QOpenGLShader(QOpenGLShader::Vertex, &program1); + const char *vsrc1 = + "attribute highp vec4 vertex;\n" + "attribute mediump vec3 normal;\n" + "uniform mediump mat4 matrix;\n" + "varying mediump vec4 color;\n" + "void main(void)\n" + "{\n" + " vec3 toLight = normalize(vec3(0.0, 0.3, 1.0));\n" + " float angle = max(dot(normal, toLight), 0.0);\n" + " vec3 col = vec3(0.40, 1.0, 0.0);\n" + " color = vec4(col * 0.2 + col * 0.8 * angle, 1.0);\n" + " color = clamp(color, 0.0, 1.0);\n" + " gl_Position = matrix * vertex;\n" + "}\n"; + vshader1->compileSourceCode(vsrc1); + + QOpenGLShader *fshader1 = new QOpenGLShader(QOpenGLShader::Fragment, &program1); + const char *fsrc1 = + "varying mediump vec4 color;\n" + "void main(void)\n" + "{\n" + " gl_FragColor = color;\n" + "}\n"; + fshader1->compileSourceCode(fsrc1); + + program1.addShader(vshader1); + program1.addShader(fshader1); + program1.link(); + + vertexAttr1 = program1.attributeLocation("vertex"); + normalAttr1 = program1.attributeLocation("normal"); + matrixUniform1 = program1.uniformLocation("matrix"); + + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR ); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR ); + + m_fAngle = 0; + m_fScale = 1; + createGeometry(); +} + +void LogoRenderer::render() +{ + glDepthMask(true); + + glClearColor(0.5f, 0.5f, 0.7f, 1.0f); + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR ); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR ); + + glFrontFace(GL_CW); + glCullFace(GL_FRONT); + glEnable(GL_CULL_FACE); + glEnable(GL_DEPTH_TEST); + + QMatrix4x4 modelview; + modelview.rotate(m_fAngle, 0.0f, 1.0f, 0.0f); + modelview.rotate(m_fAngle, 1.0f, 0.0f, 0.0f); + modelview.rotate(m_fAngle, 0.0f, 0.0f, 1.0f); + modelview.scale(m_fScale); + modelview.translate(0.0f, -0.2f, 0.0f); + + program1.bind(); + program1.setUniformValue(matrixUniform1, modelview); + paintQtLogo(); + program1.release(); + + glDisable(GL_DEPTH_TEST); + glDisable(GL_CULL_FACE); + + m_fAngle += 1.0f; +} + +void LogoRenderer::createGeometry() +{ + vertices.clear(); + normals.clear(); + + qreal x1 = +0.06f; + qreal y1 = -0.14f; + qreal x2 = +0.14f; + qreal y2 = -0.06f; + qreal x3 = +0.08f; + qreal y3 = +0.00f; + qreal x4 = +0.30f; + qreal y4 = +0.22f; + + quad(x1, y1, x2, y2, y2, x2, y1, x1); + quad(x3, y3, x4, y4, y4, x4, y3, x3); + + extrude(x1, y1, x2, y2); + extrude(x2, y2, y2, x2); + extrude(y2, x2, y1, x1); + extrude(y1, x1, x1, y1); + extrude(x3, y3, x4, y4); + extrude(x4, y4, y4, x4); + extrude(y4, x4, y3, x3); + + const qreal Pi = 3.14159f; + const int NumSectors = 100; + + for (int i = 0; i < NumSectors; ++i) { + qreal angle1 = (i * 2 * Pi) / NumSectors; + qreal x5 = 0.30 * sin(angle1); + qreal y5 = 0.30 * cos(angle1); + qreal x6 = 0.20 * sin(angle1); + qreal y6 = 0.20 * cos(angle1); + + qreal angle2 = ((i + 1) * 2 * Pi) / NumSectors; + qreal x7 = 0.20 * sin(angle2); + qreal y7 = 0.20 * cos(angle2); + qreal x8 = 0.30 * sin(angle2); + qreal y8 = 0.30 * cos(angle2); + + quad(x5, y5, x6, y6, x7, y7, x8, y8); + + extrude(x6, y6, x7, y7); + extrude(x8, y8, x5, y5); + } + + for (int i = 0;i < vertices.size();i++) + vertices[i] *= 2.0f; +} + +void LogoRenderer::quad(qreal x1, qreal y1, qreal x2, qreal y2, qreal x3, qreal y3, qreal x4, qreal y4) +{ + vertices << QVector3D(x1, y1, -0.05f); + vertices << QVector3D(x2, y2, -0.05f); + vertices << QVector3D(x4, y4, -0.05f); + + vertices << QVector3D(x3, y3, -0.05f); + vertices << QVector3D(x4, y4, -0.05f); + vertices << QVector3D(x2, y2, -0.05f); + + QVector3D n = QVector3D::normal + (QVector3D(x2 - x1, y2 - y1, 0.0f), QVector3D(x4 - x1, y4 - y1, 0.0f)); + + normals << n; + normals << n; + normals << n; + + normals << n; + normals << n; + normals << n; + + vertices << QVector3D(x4, y4, 0.05f); + vertices << QVector3D(x2, y2, 0.05f); + vertices << QVector3D(x1, y1, 0.05f); + + vertices << QVector3D(x2, y2, 0.05f); + vertices << QVector3D(x4, y4, 0.05f); + vertices << QVector3D(x3, y3, 0.05f); + + n = QVector3D::normal + (QVector3D(x2 - x4, y2 - y4, 0.0f), QVector3D(x1 - x4, y1 - y4, 0.0f)); + + normals << n; + normals << n; + normals << n; + + normals << n; + normals << n; + normals << n; +} + +void LogoRenderer::extrude(qreal x1, qreal y1, qreal x2, qreal y2) +{ + vertices << QVector3D(x1, y1, +0.05f); + vertices << QVector3D(x2, y2, +0.05f); + vertices << QVector3D(x1, y1, -0.05f); + + vertices << QVector3D(x2, y2, -0.05f); + vertices << QVector3D(x1, y1, -0.05f); + vertices << QVector3D(x2, y2, +0.05f); + + QVector3D n = QVector3D::normal + (QVector3D(x2 - x1, y2 - y1, 0.0f), QVector3D(0.0f, 0.0f, -0.1f)); + + normals << n; + normals << n; + normals << n; + + normals << n; + normals << n; + normals << n; +} diff --git a/examples/quick/scenegraph/shared/logorenderer.h b/examples/quick/scenegraph/shared/logorenderer.h new file mode 100644 index 0000000000..48fbf87203 --- /dev/null +++ b/examples/quick/scenegraph/shared/logorenderer.h @@ -0,0 +1,77 @@ +/**************************************************************************** +** +** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** You may use this file under the terms of the BSD license as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names +** of its contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef LOGORENDERER_H +#define LOGORENDERER_H + +#include +#include +#include + +#include +#include + +class LogoRenderer { + +public: + LogoRenderer(); + ~LogoRenderer(); + + void render(); + void initialize(); + +private: + + qreal m_fAngle; + qreal m_fScale; + + void paintQtLogo(); + void createGeometry(); + void quad(qreal x1, qreal y1, qreal x2, qreal y2, qreal x3, qreal y3, qreal x4, qreal y4); + void extrude(qreal x1, qreal y1, qreal x2, qreal y2); + + QVector vertices; + QVector normals; + QOpenGLShaderProgram program1; + int vertexAttr1; + int normalAttr1; + int matrixUniform1; +}; +#endif -- cgit v1.2.3