Revision control
Copy as Markdown
// 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