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[spline/bezier]Improve TemplateParameterDispatcher class macro to a r…

…eal class.
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xebra committed Jul 21, 2018
1 parent 98ddefb commit a241058d7b809b34e5f1a4d52fafa6e2903d2182
Showing with 44 additions and 36 deletions.
  1. +2 −3 GPU/Common/SplineCommon.cpp
  2. +42 −33 GPU/Common/SplineCommon.h
@@ -409,13 +409,12 @@ class SubdivisionSurface {
patch.BuildIndex(indices, count);
}
// Define class TemplateParameterDispatcherTess
TEMPLATE_PARAMETER_DISPATCHER(Tess, SubdivisionSurface::Tessellate);
TEMPLATE_PARAMETER_DISPATCHER_FUNCTION(Tess, SubdivisionSurface::Tessellate);
void Tessellate(SimpleVertex *vertices, u16 *indices, int &count, u32 origVertType) {
using TessFunc = void(SubdivisionSurface::*)(SimpleVertex *, u16 *, int &);
constexpr int NumParams = 5;
static TemplateParameterDispatcherTess<TessFunc, NumParams> dispatcher; // Initialize only once
static TemplateParameterDispatcher<TessFunc, NumParams, Tess> dispatcher; // Initialize only once
const bool params[NumParams] = {
(origVertType & GE_VTYPE_NRM_MASK) != 0,
@@ -195,38 +195,47 @@ bool CanUseHardwareTessellation(GEPatchPrimType prim);
void TessellateSplinePatch(u8 *&dest, u16 *indices, int &count, SplinePatchLocal &spatch, u32 origVertType, int maxVertices);
void TessellateBezierPatch(u8 *&dest, u16 *&indices, int &count, int tess_u, int tess_v, const BezierPatch &patch, u32 origVertType, int maxVertices);
#define TEMPLATE_PARAMETER_DISPATCHER(NAME, FUNCNAME) \
template<typename Func, int NumParams> \
class TemplateParameterDispatcher##NAME { \
/* Store all combinations of template functions into an array */ \
template<int LoopCount, int Index = 0, bool ...Params> \
struct Initializer { \
Initializer(Func funcs[]) { \
Initializer<LoopCount - 1, (Index << 1) + 1, true, Params...> _true(funcs); \
Initializer<LoopCount - 1, (Index << 1) + 0, false, Params...> _false(funcs); \
} \
}; \
/* Specialized for terminates the recursive loop */ \
template<int Index, bool ...Params> \
struct Initializer<0, Index, Params...> { \
Initializer(Func funcs[]) { \
funcs[Index] = &FUNCNAME<Params...>; \
} \
}; \
\
private: \
Func funcs[1 << NumParams]; /* Function pointers array */ \
public: \
TemplateParameterDispatcher##NAME() { \
Initializer<NumParams>::Initializer(funcs); \
} \
\
Func GetFunc(const bool params[]) const { \
/* Convert bool parameters to index of the array */ \
int param = 0; \
for (int i = 0; i < NumParams; ++i) \
param |= params[i] << i; \
\
return funcs[param]; \
// Define function object for TemplateParameterDispatcher
#define TEMPLATE_PARAMETER_DISPATCHER_FUNCTION(NAME, FUNCNAME) \
struct NAME { \
template<bool ...Params> \
static auto GetFunc() { \
return &FUNCNAME<Params...>; \
} \
};
template<typename Func, int NumParams, class Dispatcher>
class TemplateParameterDispatcher {
/* Store all combinations of template functions into an array */
template<int LoopCount, int Index = 0, bool ...Params>
struct Initializer {
static void Init(Func funcs[]) {
Initializer<LoopCount - 1, (Index << 1) + 1, true, Params...>::Init(funcs); // true
Initializer<LoopCount - 1, (Index << 1) + 0, false, Params...>::Init(funcs); // false
}
};
/* Specialized for terminates the recursive loop */
template<int Index, bool ...Params>
struct Initializer<0, Index, Params...> {
static void Init(Func funcs[]) {
funcs[Index] = Dispatcher::GetFunc<Params...>();
}
};
private:
Func funcs[1 << NumParams]; /* Function pointers array */
public:
TemplateParameterDispatcher() {
Initializer<NumParams>::Init(funcs);
}
Func GetFunc(const bool params[]) const {
/* Convert bool parameters to index of the array */
int index = 0;
for (int i = 0; i < NumParams; ++i)
index |= params[i] << i;
return funcs[index];
}
};

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