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#pragma once
#include "GfxDeviceTypes.h"
#include "Runtime/Math/Matrix4x4.h"
#include "BuiltinShaderParams.h"
struct TransformState
{
enum {
kWorldDirty = (1<<0),
kViewDirty = (1<<1),
kProjDirty = (1<<2),
kWorldViewDirty = (kWorldDirty | kViewDirty),
kViewProjDirty = (kViewDirty | kProjDirty),
kWorldViewProjDirty = (kWorldDirty | kViewDirty | kProjDirty),
};
Matrix4x4f worldMatrix;
Matrix4x4f projectionMatrixOriginal; // Originally set from Unity code
Matrix4x4f texMatrices[kMaxSupportedTextureCoords];
// cache
mutable Matrix4x4f worldViewMatrix;
mutable volatile UInt32 dirtyFlags;
public:
void Invalidate(BuiltinShaderParamValues& builtins);
void UpdateWorldViewMatrix (const BuiltinShaderParamValues& builtins) const;
void SetViewMatrix (const float matrix[16], BuiltinShaderParamValues& builtins);
};
inline void TransformState::Invalidate(BuiltinShaderParamValues& builtins)
{
worldViewMatrix.SetIdentity();
worldMatrix.SetIdentity();
builtins.GetWritableMatrixParam(kShaderMatView).SetIdentity();
builtins.GetWritableMatrixParam(kShaderMatProj).SetIdentity();
builtins.GetWritableMatrixParam(kShaderMatViewProj).SetIdentity();
projectionMatrixOriginal.SetIdentity();
dirtyFlags = kWorldViewProjDirty;
}
inline void TransformState::UpdateWorldViewMatrix (const BuiltinShaderParamValues& builtins) const
{
if (dirtyFlags & kWorldViewDirty)
{
MultiplyMatrices4x4 (&builtins.GetMatrixParam(kShaderMatView), &worldMatrix, &worldViewMatrix);
dirtyFlags &= ~kWorldViewDirty;
}
}
inline void TransformState::SetViewMatrix (const float matrix[16], BuiltinShaderParamValues& builtins)
{
dirtyFlags |= TransformState::kWorldViewDirty;
Matrix4x4f& viewMat = builtins.GetWritableMatrixParam(kShaderMatView);
const Matrix4x4f& projMat = builtins.GetMatrixParam(kShaderMatProj);
Matrix4x4f& viewProjMat = builtins.GetWritableMatrixParam(kShaderMatViewProj);
CopyMatrix (matrix, viewMat.GetPtr());
MultiplyMatrices4x4 (&projMat, &viewMat, &viewProjMat);
worldMatrix = Matrix4x4f::identity;
}
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