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#ifndef OPENMW_COMPONENTS_REMOVEDALPHAFUNC_H
#define OPENMW_COMPONENTS_REMOVEDALPHAFUNC_H
#include <array>
#include <osg/AlphaFunc>
namespace Shader
{
// State attribute used when shader visitor replaces the deprecated alpha function with a shader
// Prevents redundant glAlphaFunc calls and lets the shadowsbin know the stateset had alpha testing
class RemovedAlphaFunc : public osg::AlphaFunc
{
public:
// Get a singleton-like instance with the right func (but a default threshold)
static osg::ref_ptr<RemovedAlphaFunc> getInstance(GLenum func);
RemovedAlphaFunc()
: osg::AlphaFunc()
{}
RemovedAlphaFunc(ComparisonFunction func, float ref)
: osg::AlphaFunc(func, ref)
{}
RemovedAlphaFunc(const RemovedAlphaFunc& raf, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY)
: osg::AlphaFunc(raf, copyop)
{}
META_StateAttribute(Shader, RemovedAlphaFunc, ALPHAFUNC);
void apply(osg::State& state) const override {}
protected:
virtual ~RemovedAlphaFunc() = default;
static std::array<osg::ref_ptr<RemovedAlphaFunc>, GL_ALWAYS - GL_NEVER + 1> sInstances;
};
}
#endif //OPENMW_COMPONENTS_REMOVEDALPHAFUNC_H
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