| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the demonstration applications of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:BSD$ |
| ** Commercial License Usage |
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| ** BSD License Usage |
| ** Alternatively, you may use this file under the terms of the BSD license |
| ** as follows: |
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| ** "Redistribution and use in source and binary forms, with or without |
| ** modification, are permitted provided that the following conditions are |
| ** met: |
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| ****************************************************************************/ |
| |
| #include "etcprovider.h" |
| |
| #include <QFile> |
| #include <QDebug> |
| #include <qopenglfunctions.h> |
| #include <qqmlfile.h> |
| |
| //#define ETC_DEBUG |
| |
| #ifndef GL_ETC1_RGB8_OES |
| #define GL_ETC1_RGB8_OES 0x8d64 |
| #endif |
| |
| typedef struct { |
| char aName[6]; |
| unsigned short iBlank; |
| /* NB: Beware endianness issues here. */ |
| unsigned char iPaddedWidthMSB; |
| unsigned char iPaddedWidthLSB; |
| unsigned char iPaddedHeightMSB; |
| unsigned char iPaddedHeightLSB; |
| unsigned char iWidthMSB; |
| unsigned char iWidthLSB; |
| unsigned char iHeightMSB; |
| unsigned char iHeightLSB; |
| } ETCHeader; |
| |
| unsigned short getWidth(ETCHeader *pHeader) |
| { |
| return (pHeader->iWidthMSB << 8) | pHeader->iWidthLSB; |
| } |
| |
| unsigned short getHeight(ETCHeader *pHeader) |
| { |
| return (pHeader->iHeightMSB << 8) | pHeader->iHeightLSB; |
| } |
| |
| unsigned short getPaddedWidth(ETCHeader *pHeader) |
| { |
| return (pHeader->iPaddedWidthMSB << 8) | pHeader->iPaddedWidthLSB; |
| } |
| |
| unsigned short getPaddedHeight(ETCHeader *pHeader) |
| { |
| return (pHeader->iPaddedHeightMSB << 8) | pHeader->iPaddedHeightLSB; |
| } |
| |
| EtcTexture::EtcTexture() |
| : m_texture_id(0), m_uploaded(false) |
| { |
| initializeOpenGLFunctions(); |
| } |
| |
| EtcTexture::~EtcTexture() |
| { |
| if (m_texture_id) |
| glDeleteTextures(1, &m_texture_id); |
| } |
| |
| int EtcTexture::textureId() const |
| { |
| if (m_texture_id == 0) { |
| EtcTexture *texture = const_cast<EtcTexture*>(this); |
| texture->glGenTextures(1, &texture->m_texture_id); |
| } |
| return m_texture_id; |
| } |
| |
| void EtcTexture::bind() |
| { |
| if (m_uploaded && m_texture_id) { |
| glBindTexture(GL_TEXTURE_2D, m_texture_id); |
| return; |
| } |
| |
| if (m_texture_id == 0) |
| glGenTextures(1, &m_texture_id); |
| glBindTexture(GL_TEXTURE_2D, m_texture_id); |
| |
| #ifdef ETC_DEBUG |
| qDebug() << "glCompressedTexImage2D, width: " << m_size.width() << "height" << m_size.height() << |
| "paddedWidth: " << m_paddedSize.width() << "paddedHeight: " << m_paddedSize.height(); |
| #endif |
| |
| #ifndef QT_NO_DEBUG |
| while (glGetError() != GL_NO_ERROR) { } |
| #endif |
| |
| QOpenGLContext *ctx = QOpenGLContext::currentContext(); |
| Q_ASSERT(ctx != nullptr); |
| ctx->functions()->glCompressedTexImage2D(GL_TEXTURE_2D, 0, GL_ETC1_RGB8_OES, |
| m_size.width(), m_size.height(), 0, |
| (m_paddedSize.width() * m_paddedSize.height()) >> 1, |
| m_data.data() + 16); |
| |
| #ifndef QT_NO_DEBUG |
| // Gracefully fail in case of an error... |
| GLuint error = glGetError(); |
| if (error != GL_NO_ERROR) { |
| qDebug () << "glCompressedTexImage2D for compressed texture failed, error: " << error; |
| glBindTexture(GL_TEXTURE_2D, 0); |
| glDeleteTextures(1, &m_texture_id); |
| m_texture_id = 0; |
| return; |
| } |
| #endif |
| |
| m_uploaded = true; |
| updateBindOptions(true); |
| } |
| |
| class QEtcTextureFactory : public QQuickTextureFactory |
| { |
| public: |
| QByteArray m_data; |
| QSize m_size; |
| QSize m_paddedSize; |
| |
| QSize textureSize() const override { return m_size; } |
| int textureByteCount() const override { return m_data.size(); } |
| |
| QSGTexture *createTexture(QQuickWindow *) const override { |
| EtcTexture *texture = new EtcTexture; |
| texture->m_data = m_data; |
| texture->m_size = m_size; |
| texture->m_paddedSize = m_paddedSize; |
| return texture; |
| } |
| }; |
| |
| QQuickTextureFactory *EtcProvider::requestTexture(const QString &id, QSize *size, const QSize &requestedSize) |
| { |
| Q_UNUSED(requestedSize); |
| QEtcTextureFactory *ret = nullptr; |
| |
| size->setHeight(0); |
| size->setWidth(0); |
| |
| QUrl url = QUrl(id); |
| if (url.isRelative() && !m_baseUrl.isEmpty()) |
| url = m_baseUrl.resolved(url); |
| QString path = QQmlFile::urlToLocalFileOrQrc(url); |
| |
| QFile file(path); |
| #ifdef ETC_DEBUG |
| qDebug() << "requestTexture opening file: " << path; |
| #endif |
| if (file.open(QIODevice::ReadOnly)) { |
| ret = new QEtcTextureFactory; |
| ret->m_data = file.readAll(); |
| if (!ret->m_data.isEmpty()) { |
| ETCHeader *pETCHeader = nullptr; |
| pETCHeader = (ETCHeader *)ret->m_data.data(); |
| size->setHeight(getHeight(pETCHeader)); |
| size->setWidth(getWidth(pETCHeader)); |
| ret->m_size = *size; |
| ret->m_paddedSize.setHeight(getPaddedHeight(pETCHeader)); |
| ret->m_paddedSize.setWidth(getPaddedWidth(pETCHeader)); |
| } |
| else { |
| delete ret; |
| ret = nullptr; |
| } |
| } |
| |
| #ifdef ETC_DEBUG |
| if (ret) |
| qDebug() << "requestTexture returning: " << ret->m_data.length() << ", bytes; width: " << size->width() << ", height: " << size->height(); |
| else |
| qDebug () << "File not found."; |
| #endif |
| |
| return ret; |
| } |
| |
| void EtcProvider::setBaseUrl(const QUrl &base) |
| { |
| m_baseUrl = base; |
| } |