1 files changed, 402 insertions, 0 deletions
diff --git a/demos/boxes/glbuffers.cpp b/demos/boxes/glbuffers.cpp
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+/****************************************************************************
+**
+** 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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, 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.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "glbuffers.h"
+#include <QtGui/qmatrix4x4.h>
+
+
+void qgluPerspective(GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdouble zFar)
+{
+    const GLdouble ymax = zNear * tan(fovy * M_PI / 360.0);
+    const GLdouble ymin = -ymax;
+    const GLdouble xmin = ymin * aspect;
+    const GLdouble xmax = ymax * aspect;
+    glFrustum(xmin, xmax, ymin, ymax, zNear, zFar);
+}
+
+//============================================================================//
+//                                  GLTexture                                 //
+//============================================================================//
+
+GLTexture::GLTexture() : m_texture(0), m_failed(false)
+{
+    glGenTextures(1, &m_texture);
+}
+
+GLTexture::~GLTexture()
+{
+    glDeleteTextures(1, &m_texture);
+}
+
+//============================================================================//
+//                                 GLTexture2D                                //
+//============================================================================//
+
+GLTexture2D::GLTexture2D(int width, int height)
+{
+    glBindTexture(GL_TEXTURE_2D, m_texture);
+    glTexImage2D(GL_TEXTURE_2D, 0, 4, width, height, 0,
+        GL_BGRA, GL_UNSIGNED_BYTE, 0);
+
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    //glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+    //glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
+    glBindTexture(GL_TEXTURE_2D, 0);
+}
+
+
+GLTexture2D::GLTexture2D(const QString& fileName, int width, int height)
+{
+    // TODO: Add error handling.
+    QImage image(fileName);
+
+    if (image.isNull()) {
+        m_failed = true;
+        return;
+    }
+
+    image = image.convertToFormat(QImage::Format_ARGB32);
+
+    //qDebug() << "Image size:" << image.width() << "x" << image.height();
+    if (width <= 0)
+        width = image.width();
+    if (height <= 0)
+        height = image.height();
+    if (width != image.width() || height != image.height())
+        image = image.scaled(width, height, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
+
+    glBindTexture(GL_TEXTURE_2D, m_texture);
+
+    // Works on x86, so probably works on all little-endian systems.
+    // Does it work on big-endian systems?
+    glTexImage2D(GL_TEXTURE_2D, 0, 4, image.width(), image.height(), 0,
+        GL_BGRA, GL_UNSIGNED_BYTE, image.bits());
+
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    //glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+    //glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
+    glBindTexture(GL_TEXTURE_2D, 0);
+}
+
+void GLTexture2D::load(int width, int height, QRgb *data)
+{
+    glBindTexture(GL_TEXTURE_2D, m_texture);
+    glTexImage2D(GL_TEXTURE_2D, 0, 4, width, height, 0,
+        GL_BGRA, GL_UNSIGNED_BYTE, data);
+    glBindTexture(GL_TEXTURE_2D, 0);
+}
+
+void GLTexture2D::bind()
+{
+    glBindTexture(GL_TEXTURE_2D, m_texture);
+    glEnable(GL_TEXTURE_2D);
+}
+
+void GLTexture2D::unbind()
+{
+    glBindTexture(GL_TEXTURE_2D, 0);
+    glDisable(GL_TEXTURE_2D);
+}
+
+
+//============================================================================//
+//                                 GLTexture3D                                //
+//============================================================================//
+
+GLTexture3D::GLTexture3D(int width, int height, int depth)
+{
+    GLBUFFERS_ASSERT_OPENGL("GLTexture3D::GLTexture3D", glTexImage3D, return)
+
+    glBindTexture(GL_TEXTURE_3D, m_texture);
+    glTexImage3D(GL_TEXTURE_3D, 0, 4, width, height, depth, 0,
+        GL_BGRA, GL_UNSIGNED_BYTE, 0);
+
+    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_REPEAT);
+    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    //glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+    //glTexParameteri(GL_TEXTURE_3D, GL_GENERATE_MIPMAP, GL_TRUE);
+    glBindTexture(GL_TEXTURE_3D, 0);
+}
+
+void GLTexture3D::load(int width, int height, int depth, QRgb *data)
+{
+    GLBUFFERS_ASSERT_OPENGL("GLTexture3D::load", glTexImage3D, return)
+
+    glBindTexture(GL_TEXTURE_3D, m_texture);
+    glTexImage3D(GL_TEXTURE_3D, 0, 4, width, height, depth, 0,
+        GL_BGRA, GL_UNSIGNED_BYTE, data);
+    glBindTexture(GL_TEXTURE_3D, 0);
+}
+
+void GLTexture3D::bind()
+{
+    glBindTexture(GL_TEXTURE_3D, m_texture);
+    glEnable(GL_TEXTURE_3D);
+}
+
+void GLTexture3D::unbind()
+{
+    glBindTexture(GL_TEXTURE_3D, 0);
+    glDisable(GL_TEXTURE_3D);
+}
+
+//============================================================================//
+//                                GLTextureCube                               //
+//============================================================================//
+
+GLTextureCube::GLTextureCube(int size)
+{
+    glBindTexture(GL_TEXTURE_CUBE_MAP, m_texture);
+
+    for (int i = 0; i < 6; ++i)
+        glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, 4, size, size, 0,
+            GL_BGRA, GL_UNSIGNED_BYTE, 0);
+
+    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    //glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+    //glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_GENERATE_MIPMAP, GL_TRUE);
+    glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
+}
+
+GLTextureCube::GLTextureCube(const QStringList& fileNames, int size)
+{
+    // TODO: Add error handling.
+
+    glBindTexture(GL_TEXTURE_CUBE_MAP, m_texture);
+
+    int index = 0;
+    foreach (QString file, fileNames) {
+        QImage image(file);
+        if (image.isNull()) {
+            m_failed = true;
+            break;
+        }
+
+        image = image.convertToFormat(QImage::Format_ARGB32);
+
+        //qDebug() << "Image size:" << image.width() << "x" << image.height();
+        if (size <= 0)
+            size = image.width();
+        if (size != image.width() || size != image.height())
+            image = image.scaled(size, size, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
+
+        // Works on x86, so probably works on all little-endian systems.
+        // Does it work on big-endian systems?
+        glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + index, 0, 4, image.width(), image.height(), 0,
+            GL_BGRA, GL_UNSIGNED_BYTE, image.bits());
+
+        if (++index == 6)
+            break;
+    }
+
+    // Clear remaining faces.
+    while (index < 6) {
+        glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + index, 0, 4, size, size, 0,
+            GL_BGRA, GL_UNSIGNED_BYTE, 0);
+        ++index;
+    }
+
+    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    //glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+    //glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_GENERATE_MIPMAP, GL_TRUE);
+    glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
+}
+
+void GLTextureCube::load(int size, int face, QRgb *data)
+{
+    glBindTexture(GL_TEXTURE_CUBE_MAP, m_texture);
+        glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, 0, 4, size, size, 0,
+            GL_BGRA, GL_UNSIGNED_BYTE, data);
+    glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
+}
+
+void GLTextureCube::bind()
+{
+    glBindTexture(GL_TEXTURE_CUBE_MAP, m_texture);
+    glEnable(GL_TEXTURE_CUBE_MAP);
+}
+
+void GLTextureCube::unbind()
+{
+    glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
+    glDisable(GL_TEXTURE_CUBE_MAP);
+}
+
+//============================================================================//
+//                            GLFrameBufferObject                             //
+//============================================================================//
+
+GLFrameBufferObject::GLFrameBufferObject(int width, int height)
+    : m_fbo(0)
+    , m_depthBuffer(0)
+    , m_width(width)
+    , m_height(height)
+    , m_failed(false)
+{
+    GLBUFFERS_ASSERT_OPENGL("GLFrameBufferObject::GLFrameBufferObject",
+        glGenFramebuffersEXT && glGenRenderbuffersEXT && glBindRenderbufferEXT && glRenderbufferStorageEXT, return)
+
+    // TODO: share depth buffers of same size
+    glGenFramebuffersEXT(1, &m_fbo);
+    //glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, m_fbo);
+    glGenRenderbuffersEXT(1, &m_depthBuffer);
+    glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, m_depthBuffer);
+    glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT, m_width, m_height);
+    //glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, m_depthBuffer);
+    //glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+}
+
+GLFrameBufferObject::~GLFrameBufferObject()
+{
+    GLBUFFERS_ASSERT_OPENGL("GLFrameBufferObject::~GLFrameBufferObject",
+        glDeleteFramebuffersEXT && glDeleteRenderbuffersEXT, return)
+
+    glDeleteFramebuffersEXT(1, &m_fbo);
+    glDeleteRenderbuffersEXT(1, &m_depthBuffer);
+}
+
+void GLFrameBufferObject::setAsRenderTarget(bool state)
+{
+    GLBUFFERS_ASSERT_OPENGL("GLFrameBufferObject::setAsRenderTarget", glBindFramebufferEXT, return)
+
+    if (state) {
+        glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, m_fbo);
+        glPushAttrib(GL_VIEWPORT_BIT);
+        glViewport(0, 0, m_width, m_height);
+    } else {
+        glPopAttrib();
+        glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+    }
+}
+
+bool GLFrameBufferObject::isComplete()
+{
+    GLBUFFERS_ASSERT_OPENGL("GLFrameBufferObject::isComplete", glCheckFramebufferStatusEXT, return false)
+
+    return GL_FRAMEBUFFER_COMPLETE_EXT == glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
+}
+
+//============================================================================//
+//                             GLRenderTargetCube                             //
+//============================================================================//
+
+GLRenderTargetCube::GLRenderTargetCube(int size)
+    : GLTextureCube(size)
+    , m_fbo(size, size)
+{
+}
+
+void GLRenderTargetCube::begin(int face)
+{
+    GLBUFFERS_ASSERT_OPENGL("GLRenderTargetCube::begin",
+        glFramebufferTexture2DEXT && glFramebufferRenderbufferEXT, return)
+
+    m_fbo.setAsRenderTarget(true);
+    glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
+        GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, m_texture, 0);
+    glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, m_fbo.m_depthBuffer);
+}
+
+void GLRenderTargetCube::end()
+{
+    m_fbo.setAsRenderTarget(false);
+}
+
+void GLRenderTargetCube::getViewMatrix(QMatrix4x4& mat, int face)
+{
+    if (face < 0 || face >= 6) {
+        qWarning("GLRenderTargetCube::getViewMatrix: 'face' must be in the range [0, 6). (face == %d)", face);
+        return;
+    }
+
+    static int perm[6][3] = {
+        {2, 1, 0},
+        {2, 1, 0},
+        {0, 2, 1},
+        {0, 2, 1},
+        {0, 1, 2},
+        {0, 1, 2},
+    };
+
+    static float signs[6][3] = {
+        {-1.0f, -1.0f, -1.0f},
+        {+1.0f, -1.0f, +1.0f},
+        {+1.0f, +1.0f, -1.0f},
+        {+1.0f, -1.0f, +1.0f},
+        {+1.0f, -1.0f, -1.0f},
+        {-1.0f, -1.0f, +1.0f},
+    };
+
+    mat.fill(0.0f);
+    for (int i = 0; i < 3; ++i)
+        mat(i, perm[face][i]) = signs[face][i];
+    mat(3, 3) = 1.0f;
+}
+
+void GLRenderTargetCube::getProjectionMatrix(QMatrix4x4& mat, float nearZ, float farZ)
+{
+    static const QMatrix4x4 reference(
+            1.0f, 0.0f, 0.0f, 0.0f,
+            0.0f, 1.0f, 0.0f, 0.0f,
+            0.0f, 0.0f, 0.0f, 0.0f,
+            0.0f, 0.0f, -1.0f, 0.0f);
+
+    mat = reference;
+    mat(2, 2) = (nearZ+farZ)/(nearZ-farZ);
+    mat(2, 3) = 2.0f*nearZ*farZ/(nearZ-farZ);
+}