Revision control
++ // 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
++
++ #ifndef QT3DRENDER_RENDER_STATEVARIANT_P_H
++ #define QT3DRENDER_RENDER_STATEVARIANT_P_H
++
++ //
++ // W A R N I N G
++ // -------------
++ //
++ // This file is not part of the Qt API. It exists for the convenience
++ // of other Qt classes. This header file may change from version to
++ // version without notice, or even be removed.
++ //
++ // We mean it.
++ //
++
++ #include <Qt3DRender/private/renderstates_p.h>
++
++ QT_BEGIN_NAMESPACE
++
++ namespace Qt3DRender {
++ namespace Render {
++
++ struct Q_3DRENDERSHARED_PRIVATE_EXPORT StateVariant
++ {
++ StateMask type;
++
++ union u_Data {
++ BlendEquationArguments blendEquationArguments;
++ BlendEquation blendEquation;
++ AlphaFunc alphaFunc;
++ MSAAEnabled msaaEnabled;
++ DepthRange depthRange;
++ DepthTest depthTest;
++ NoDepthMask noDepthMask;
++ CullFace cullFace;
++ FrontFace frontFace;
++ Dithering dithering;
++ ScissorTest scissorTest;
++ StencilTest stencilTest;
++ AlphaCoverage alphaCoverage;
++ PointSize pointSize;
++ PolygonOffset polygonOffset;
++ ColorMask colorMask;
++ ClipPlane clipPlane;
++ SeamlessCubemap seamlessCubemap;
++ StencilOp stencilOp;
++ StencilMask stencilMask;
++ LineWidth lineWidth;
++
++ u_Data()
++ {
++ // Assumes the above types don't need to have their ctor called
++ memset(static_cast<void *>(this), 0, sizeof(u_Data));
++ }
++
++ u_Data(const u_Data &other)
++ {
++ memcpy(static_cast<void *>(this), static_cast<const void *>(&other), sizeof(u_Data));
++ }
++
++ u_Data& operator=(const u_Data &other)
++ {
++ memcpy(static_cast<void *>(this), static_cast<const void *>(&other), sizeof(u_Data));
++ return *this;
++ }
++
++ ~u_Data()
++ {
++ // Assumes the above types don't need to have their dtor called
++ }
++ } data;
++
++ template<class State, typename ... Args>
++ static StateVariant createState(Args... values)
++ {
++ State state;
++ state.set(values...);
++ return StateVariant::fromValue(state);
++ }
++
++ template<typename GenericState>
++ static StateVariant fromValue(const GenericState &state)
++ {
++ StateVariant v;
++ v.type = GenericState::type();
++ // all union members start at the same memory address
++ // so we can just write into whichever we want
++ memcpy(static_cast<void *>(&v.data), static_cast<const void *>(&state), sizeof(state));
++ return v;
++ }
++
++ RenderStateImpl *state();
++ const RenderStateImpl *constState() const;
++
++ bool operator ==(const StateVariant &other) const;
++ bool operator !=(const StateVariant &other) const;
++ };
++
++ } // namespace Render
++ } // namespace Qt3DRender
++
++ QT_END_NAMESPACE
++
++ #endif // QT3DRENDER_RENDER_STATEVARIANT_P_H