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Diffstat (limited to 'src/plugins/renderers/opengl/graphicshelpers/texturesubmissioncontext.cpp')
| -rw-r--r-- | src/plugins/renderers/opengl/graphicshelpers/texturesubmissioncontext.cpp | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/src/plugins/renderers/opengl/graphicshelpers/texturesubmissioncontext.cpp b/src/plugins/renderers/opengl/graphicshelpers/texturesubmissioncontext.cpp new file mode 100644 index 000000000..4577d3d10 --- /dev/null +++ b/src/plugins/renderers/opengl/graphicshelpers/texturesubmissioncontext.cpp @@ -0,0 +1,228 @@ +/**************************************************************************** +** +** Copyright (C) 2019 Klaralvdalens Datakonsult AB (KDAB). +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the Qt3D module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "texturesubmissioncontext_p.h" + +#include <graphicscontext_p.h> +#include <gltexture_p.h> +#include <logging_p.h> + +QT_BEGIN_NAMESPACE + +namespace Qt3DRender { +namespace Render { +namespace OpenGL { + +class TextureExtRendererLocker +{ +public: + static void lock(GLTexture *tex) + { + if (!tex->isExternalRenderingEnabled()) + return; + if (s_lockHash.keys().contains(tex)) { + ++s_lockHash[tex]; + } else { + tex->externalRenderingLock()->lock(); + s_lockHash[tex] = 1; + } + } + static void unlock(GLTexture *tex) + { + if (!tex->isExternalRenderingEnabled()) + return; + if (!s_lockHash.keys().contains(tex)) + return; + + --s_lockHash[tex]; + if (s_lockHash[tex] == 0) { + s_lockHash.remove(tex); + tex->externalRenderingLock()->unlock(); + } + } +private: + static QHash<GLTexture*, int> s_lockHash; +}; + +QHash<GLTexture*, int> TextureExtRendererLocker::s_lockHash = QHash<GLTexture*, int>(); + + +TextureSubmissionContext::TextureSubmissionContext() +{ + +} + +TextureSubmissionContext::~TextureSubmissionContext() +{ + +} + +void TextureSubmissionContext::initialize(GraphicsContext *context) +{ + m_activeTextures.resize(context->maxTextureUnitsCount()); +} + +void TextureSubmissionContext::endDrawing() +{ + decayTextureScores(); + for (int i = 0; i < m_activeTextures.size(); ++i) + if (m_activeTextures[i].texture) + TextureExtRendererLocker::unlock(m_activeTextures[i].texture); +} + +int TextureSubmissionContext::activateTexture(TextureSubmissionContext::TextureScope scope, + QOpenGLContext *m_gl, + GLTexture *tex) +{ + // Returns the texture unit to use for the texture + // This always return a valid unit, unless there are more textures than + // texture unit available for the current material + const int onUnit = assignUnitForTexture(tex); + + // check we didn't overflow the available units + if (onUnit == -1) + return -1; + + const int sharedTextureId = tex->sharedTextureId(); + // We have a valid texture id provided by a shared context + if (sharedTextureId > 0) { + m_gl->functions()->glActiveTexture(GL_TEXTURE0 + onUnit); + const QAbstractTexture::Target target = tex->properties().target; + // For now we know that target values correspond to the GL values + m_gl->functions()->glBindTexture(target, tex->sharedTextureId()); + } else { + // Texture must have been created and updated at this point + QOpenGLTexture *glTex = tex->getGLTexture(); + if (glTex == nullptr) + return -1; + glTex->bind(uint(onUnit)); + } + if (m_activeTextures[onUnit].texture != tex) { + if (m_activeTextures[onUnit].texture) + TextureExtRendererLocker::unlock(m_activeTextures[onUnit].texture); + m_activeTextures[onUnit].texture = tex; + TextureExtRendererLocker::lock(tex); + } + +#if defined(QT3D_RENDER_ASPECT_OPENGL_DEBUG) + int err = m_gl->functions()->glGetError(); + if (err) + qCWarning(Backend) << "GL error after activating texture" << QString::number(err, 16) + << tex->getGLTexture()->textureId() << "on unit" << onUnit; +#endif + + m_activeTextures[onUnit].score = 200; + m_activeTextures[onUnit].pinned = true; + m_activeTextures[onUnit].scope = scope; + + return onUnit; +} + +void TextureSubmissionContext::deactivateTexturesWithScope(TextureSubmissionContext::TextureScope ts) +{ + for (int u=0; u<m_activeTextures.size(); ++u) { + if (!m_activeTextures[u].pinned) + continue; // inactive, ignore + + if (m_activeTextures[u].scope == ts) { + m_activeTextures[u].pinned = false; + m_activeTextures[u].score = qMax(m_activeTextures[u].score, 1) - 1; + } + } // of units iteration +} + +void TextureSubmissionContext::deactivateTexture(GLTexture* tex) +{ + for (int u=0; u<m_activeTextures.size(); ++u) { + if (m_activeTextures[u].texture == tex) { + Q_ASSERT(m_activeTextures[u].pinned); + m_activeTextures[u].pinned = false; + return; + } + } // of units iteration + + qCWarning(Backend) << Q_FUNC_INFO << "texture not active:" << tex; +} + +/*! + \internal + Returns a texture unit for a texture, -1 if all texture units are assigned. + Tries to use the texture unit with the texture that hasn't been used for the longest time + if the texture happens not to be already pinned on a texture unit. + */ +int TextureSubmissionContext::assignUnitForTexture(GLTexture *tex) +{ + int lowestScoredUnit = -1; + int lowestScore = 0xfffffff; + + for (int u=0; u<m_activeTextures.size(); ++u) { + if (m_activeTextures[u].texture == tex) + return u; + } + + for (int u=0; u<m_activeTextures.size(); ++u) { + // No texture is currently active on the texture unit + // we save the texture unit with the texture that has been on there + // the longest time while not being used + if (!m_activeTextures[u].pinned) { + int score = m_activeTextures[u].score; + if (score < lowestScore) { + lowestScore = score; + lowestScoredUnit = u; + } + } + } // of units iteration + + if (lowestScoredUnit == -1) + qCWarning(Backend) << Q_FUNC_INFO << "No free texture units!"; + + return lowestScoredUnit; +} + +void TextureSubmissionContext::decayTextureScores() +{ + for (int u = 0; u < m_activeTextures.size(); u++) + m_activeTextures[u].score = qMax(m_activeTextures[u].score - 1, 0); +} + +} // namespace OpenGL +} // namespace Render +} // namespace Qt3DRender of namespace + +QT_END_NAMESPACE |