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39
40#include "qsgcompressedatlastexture_p.h"
41
42#include <QtCore/QVarLengthArray>
43#include <QtCore/QElapsedTimer>
44#include <QtCore/QtMath>
45
46#include <QtGui/QOpenGLContext>
47#include <QtGui/QGuiApplication>
48#include <QtGui/QScreen>
49#include <QtGui/QSurface>
50#include <QtGui/QWindow>
51#include <QtGui/QOpenGLFunctions>
52#include <QtGui/QOpenGLTexture>
53#include <QDebug>
54
55#include <private/qqmlglobal_p.h>
56#include <private/qquickprofiler_p.h>
57#include <private/qsgtexture_p.h>
58#include <private/qsgcompressedtexture_p.h>
59
60QT_BEGIN_NAMESPACE
61
62static QElapsedTimer qsg_renderer_timer;
63
64namespace QSGCompressedAtlasTexture
65{
66
67Atlas::Atlas(const QSize &size, uint format)
68 : QSGOpenGLAtlasTexture::AtlasBase(size)
69 , m_format(format)
70{
71}
72
73Atlas::~Atlas()
74{
75}
76
77Texture *Atlas::create(const QByteArray &data, int dataLength, int dataOffset, const QSize &size, const QSize &paddedSize)
78{
79 // No need to lock, as manager already locked it.
80 QRect rect = m_allocator.allocate(size: paddedSize);
81 if (rect.width() > 0 && rect.height() > 0) {
82 Texture *t = new Texture(this, rect, data, dataLength, dataOffset, size);
83 m_pending_uploads << t;
84 return t;
85 }
86 return nullptr;
87}
88
89void Atlas::generateTexture()
90{
91 int bytesPerBlock = 8;
92 switch (m_format) {
93 case QOpenGLTexture::RGBA8_ETC2_EAC:
94 case QOpenGLTexture::RGBA_DXT3:
95 case QOpenGLTexture::RGBA_DXT5:
96 bytesPerBlock = 16;
97 default:
98 break;
99 }
100
101 QOpenGLFunctions *funcs = QOpenGLContext::currentContext()->functions();
102 funcs->glCompressedTexImage2D(GL_TEXTURE_2D, level: 0, internalformat: m_format,
103 width: m_size.width(), height: m_size.height(), border: 0,
104 imageSize: (m_size.width() / 4 * m_size.height() / 4) * bytesPerBlock,
105 data: nullptr);
106}
107
108void Atlas::uploadPendingTexture(int i)
109{
110 Texture *texture = static_cast<Texture*>(m_pending_uploads.at(i));
111
112 const QRect &r = texture->atlasSubRect();
113
114 QOpenGLFunctions *funcs = QOpenGLContext::currentContext()->functions();
115 funcs->glCompressedTexSubImage2D(GL_TEXTURE_2D, level: 0,
116 xoffset: r.x(), yoffset: r.y(), width: r.width(), height: r.height(), format: m_format,
117 imageSize: texture->sizeInBytes(),
118 data: texture->data().constData() + texture->dataOffset());
119
120 qCDebug(QSG_LOG_TIME_TEXTURE).nospace() << "compressed atlastexture uploaded in: " << qsg_renderer_timer.elapsed()
121 << "ms (" << texture->textureSize().width() << "x"
122 << texture->textureSize().height() << ")";
123
124 // TODO: consider releasing the data (as is done in the regular atlas)?
125 // The advantage of keeping this data around is that it makes it much easier
126 // to remove the texture from the atlas
127}
128
129Texture::Texture(Atlas *atlas, const QRect &textureRect, const QByteArray &data, int dataLength, int dataOffset, const QSize &size)
130 : QSGOpenGLAtlasTexture::TextureBase(atlas, textureRect)
131 , m_nonatlas_texture(nullptr)
132 , m_data(data)
133 , m_size(size)
134 , m_dataLength(dataLength)
135 , m_dataOffset(dataOffset)
136{
137 float w = atlas->size().width();
138 float h = atlas->size().height();
139 const QRect &r = atlasSubRect();
140 // offset by half-pixel to prevent bleeding when scaling
141 m_texture_coords_rect = QRectF((r.x() + .5) / w,
142 (r.y() + .5) / h,
143 (size.width() - 1.) / w,
144 (size.height() - 1.) / h);
145}
146
147Texture::~Texture()
148{
149 delete m_nonatlas_texture;
150}
151
152bool Texture::hasAlphaChannel() const
153{
154 return !QSGCompressedTexture::formatIsOpaque(glTextureFormat: static_cast<Atlas*>(m_atlas)->format());
155}
156
157QSGTexture *Texture::removedFromAtlas() const
158{
159 if (m_nonatlas_texture) {
160 m_nonatlas_texture->setMipmapFiltering(mipmapFiltering());
161 m_nonatlas_texture->setFiltering(filtering());
162 return m_nonatlas_texture;
163 }
164
165 if (!m_data.isEmpty()) {
166 QTextureFileData texData;
167 texData.setData(m_data);
168 texData.setSize(m_size);
169 texData.setGLInternalFormat(static_cast<Atlas*>(m_atlas)->format());
170 texData.setDataLength(length: m_dataLength);
171 texData.setDataOffset(offset: m_dataOffset);
172 m_nonatlas_texture = new QSGCompressedTexture(texData);
173 m_nonatlas_texture->setMipmapFiltering(mipmapFiltering());
174 m_nonatlas_texture->setFiltering(filtering());
175 }
176
177 return m_nonatlas_texture;
178}
179
180}
181
182QT_END_NAMESPACE
183

source code of qtdeclarative/src/quick/scenegraph/compressedtexture/qsgcompressedatlastexture.cpp