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#ifndef GFX_FLAG_COMBINER_H
#define GFX_FLAG_COMBINER_H
#include "../../source/core/slang-list.h"
namespace gfx
{
/* A default set of flags that can be used for checking devices */
typedef uint32_t DeviceCheckFlags;
struct DeviceCheckFlag
{
enum Enum : DeviceCheckFlags
{
UseFullFeatureLevel = 0x1, //< If set will use full feature level (on dx this is
// D3D_FEATURE_LEVEL_11_1 else will try D3D_FEATURE_LEVEL_11_0)
UseHardwareDevice = 0x2, //< If set will try a hardware device
UseDebug = 0x4, //< If set will enable use of debug
};
};
/* Controls how and the order flags are changed, on the FlagCombiner */
enum class ChangeType
{
On, ///< Always on
Off, ///< Always off
OnOff, ///< Initially on then off
OffOn, ///< Initially off then on
};
/* Calculates all the combinations of flags as controlled by the change types.
The order of adding flags can be considered to be like a nested loop
for (first added) {
for (second added)
{
///..
}
}
So the last added flags will have the highest frequency.
*/
class FlagCombiner
{
public:
/// Add a flag and how it changes over the combinations
/// NOTE! That the order flags are added controls the order they change when combinations are
/// calculated - earlier added flags will change with the highest frequency
void add(uint32_t flags, ChangeType changeType);
/// Calculate all of the combinations and place in an array
void calcCombinations(Slang::List<uint32_t>& outCombinations) const;
/// Reset back to initial state
void reset();
/// Get the total amount of combinations
int getNumCombinations() const { return 1 << m_numChangingBits; }
/// Get the combination at i
uint32_t getCombination(int i) const;
protected:
uint32_t m_changingBits[32];
int m_numChangingBits = 0;
uint32_t m_usedFlags = 0;
uint32_t m_invertBits = 0;
};
} // namespace gfx
#endif // GFX_FLAG_COMBINER_H
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