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++ // Copyright (C) 2016 Klaralvdalens Datakonsult AB (KDAB).
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
++
++ #include "scene3dsgmaterialshader_p.h"
++
++ #include <qopenglcontext.h>
++ #include <qopenglfunctions.h>
++ #include <QtGui/qsurfaceformat.h>
++
++ #include <scene3dsgmaterial_p.h>
++
++ QT_BEGIN_NAMESPACE
++
++ namespace {
++
++ inline bool isPowerOfTwo(int x)
++ {
++ // Assumption: x >= 1
++ return x == (x & -x);
++ }
++
++ }
++
++ namespace Qt3DRender {
++
++ /*!
++ \class Qt3DCore::SCene3DMaterialShader
++ \internal
++
++ \brief The Qt3DRender::Scene3DSGMaterialShader class is a custom
++ QSGMaterialShader subclass instantiated by a Qt3DRender::Scene3DSGMateria1
++
++ The Qt3DRender::Scene3DSGMaterialShader provides a shader that renders a texture
++ using premultiplied alpha.
++ */
++
++ QSGMaterialType Scene3DSGMaterialShader::type;
++
++ Scene3DSGMaterialShader::Scene3DSGMaterialShader()
++ : QSGMaterialShader()
++ {
++ // Generated with qsb, we target all GL version Qt3D can handle
++ // qsb -b --glsl "460,450,440,430,420,410,400,330,150,130,120,320 es,300 es,100 es" --hlsl 50 --msl 12 -o scene3dmaterial.vert.qsb scene3dmaterial.vert
++ // qsb --glsl "460,450,440,430,420,410,400,330,150,130,120,320 es,300 es,100 es" --hlsl 50 --msl 12 -o scene3dmaterial.frag.qsb scene3dmaterial.frag
++ setShaderFileName(VertexStage, QLatin1String(":/shaders/scene3dmaterial.vert.qsb"));
++ setShaderFileName(FragmentStage, QLatin1String(":/shaders/scene3dmaterial.frag.qsb"));
++ }
++
++ bool Scene3DSGMaterialShader::updateUniformData(QSGMaterialShader::RenderState &state,
++ QSGMaterial *newMaterial,
++ QSGMaterial *oldMaterial)
++ {
++ // layout(std140, binding = 0) uniform buf {
++ // mat4 qt_Matrix; // offset 0, sizeof(float) * 16
++ // float qt_Opacity; // offset sizeof(float) * 16, sizeof(float)
++ // bool visible; // offset sizeof(float) * 17, sizeof(float)
++ // };
++
++ QByteArray *buf = state.uniformData();
++ Q_ASSERT(buf->size() >= int(18 * sizeof(float)));
++ Scene3DSGMaterial *tx = static_cast<Scene3DSGMaterial *>(newMaterial);
++ Scene3DSGMaterial *oldTx = static_cast<Scene3DSGMaterial *>(oldMaterial);
++
++ bool updateMade = false;
++
++ if (state.isMatrixDirty()) {
++ const QMatrix4x4 &m = state.combinedMatrix();
++ memcpy(buf->data(), m.constData(), 16 * sizeof(float));
++ updateMade = true;
++ }
++
++ if (state.isOpacityDirty()) {
++ const float opacity = state.opacity();
++ memcpy(buf->data() + 16 * sizeof(float), &opacity, sizeof(float));
++ updateMade = true;
++ }
++
++ if (oldTx == nullptr || oldTx->visible() != tx->visible()) {
++ const float value = tx->visible() ? 1.0f : -1.0f;
++ memcpy(buf->data() + 17 * sizeof(float), &value, sizeof(float));
++ updateMade = true;
++ }
++
++ return updateMade;
++ }
++
++ void Scene3DSGMaterialShader::updateSampledImage(QSGMaterialShader::RenderState &state,
++ int binding,
++ QSGTexture **texture,
++ QSGMaterial *newMaterial,
++ QSGMaterial *oldMaterial)
++ {
++ Q_UNUSED(state);
++ Q_UNUSED(binding);
++ Scene3DSGMaterial *tx = static_cast<Scene3DSGMaterial *>(newMaterial);
++ Scene3DSGMaterial *oldTx = static_cast<Scene3DSGMaterial *>(oldMaterial);
++ QSGTexture *t = tx->texture();
++
++ if (t != nullptr) {
++ // TODO QT6 FIXME
++ // bool npotSupported = const_cast<QOpenGLContext *>(state.context())
++ // ->functions()->hasOpenGLFeature(QOpenGLFunctions::NPOTTextureRepeat);
++ bool npotSupported = true;
++ if (!npotSupported) {
++ const QSize size = t->textureSize();
++ const bool isNpot = !isPowerOfTwo(size.width()) || !isPowerOfTwo(size.height());
++ if (isNpot) {
++ t->setHorizontalWrapMode(QSGTexture::ClampToEdge);
++ t->setVerticalWrapMode(QSGTexture::ClampToEdge);
++ }
++ }
++
++ if (oldTx == nullptr || oldTx->texture() != t)
++ *texture = t;
++ }
++ }
++
++ } // namespace Qt3DRender
++
++ QT_END_NAMESPACE