Frame interp: Fix Epona's reins

include/d/actor/d_a_horse.h

@@ -196,6 +196,9 @@ public:
     void copyReinPos();
     void setReinPosHandSubstance(int);
     void setReinPosNormalSubstance();
+#if TARGET_PC
+    void lerpControlPoints(f32 alpha);
+#endif
     void bgCheck();
     bool checkSpecialWallHitSubstance(cXyz const&) const;
     void setServiceWaitTimer();

include/d/d_drawlist.h

@@ -435,6 +435,10 @@ public:
         m3DLineMatSortPacket[param_1->getMaterialID()].setMatDark(param_1);
     }
 
+#if TARGET_PC
+    void refresh3DlineMats(const cXyz& eye);
+#endif
+
     void peekZdata() { mPeekZ.peekData(); }
     void entryZSortListZxlu(J3DPacket* i_packet, cXyz& param_1) {
         entryZSortXluDrawList(mDrawBuffers[DB_LIST_Z_XLU], i_packet, param_1);

include/dusk/frame_interpolation.h

@@ -6,6 +6,8 @@
 #include <stddef.h>
 #include <stdint.h>
 
+struct cXyz;
+
 #ifdef __cplusplus
 namespace dusk {
 namespace frame_interp {
@@ -15,6 +17,7 @@ void ensure_initialized();
 void begin_record();
 void end_record();
 void interpolate(float step);
+float get_interpolation_step();
 void notify_sim_tick_complete();
 uint32_t begin_presentation_ui_pass();
 uint32_t get_presentation_ui_advance_ticks();
@@ -27,6 +30,8 @@ void record_final_mtx_raw(const Mtx* dest, const Mtx src);
 bool lookup_replacement(const void* source, Mtx out);
 bool lookup_concat_replacement(const void* lhs, const void* rhs, Mtx out);
 
+void camera_eye_from_view_mtx(MtxP view_mtx, cXyz* o_eye);
+
 }  // namespace frame_interp
 }  // namespace dusk
 #endif

include/m_Do/m_Do_ext.h

@@ -541,6 +541,9 @@ public:
     virtual int getMaterialID() = 0;
     virtual void setMaterial() = 0;
     virtual void draw() = 0;
+#if TARGET_PC
+    virtual void refreshGeometryForPresentationEye(const cXyz& eye) {}
+#endif
 
     /* 0x4 */ mDoExt_3DlineMat_c* field_0x4;
 };
@@ -582,11 +585,19 @@ class dKy_tevstr_c;
 class mDoExt_3DlineMat1_c : public mDoExt_3DlineMat_c {
 public:
     int init(u16, u16, ResTIMG*, int);
+#if TARGET_PC
+    void update(int, GXColor&, dKy_tevstr_c*, const cXyz* presentationEye = nullptr);
+    void update(int, f32, GXColor&, u16, dKy_tevstr_c*, const cXyz* presentationEye = nullptr);
+#else
     void update(int, GXColor&, dKy_tevstr_c*);
     void update(int, f32, GXColor&, u16, dKy_tevstr_c*);
+#endif
     int getMaterialID() { return 1; }
     void setMaterial();
     void draw();
+#if TARGET_PC
+    void refreshGeometryForPresentationEye(const cXyz& eye) override;
+#endif
 
     cXyz* getPos(int i_idx) { return mpLines[i_idx].field_0x0; }
     f32* getSize(int i_idx) { return mpLines[i_idx].field_0x4; }
@@ -600,6 +611,11 @@ private:
     /* 0x34 */ u16 field_0x34;
     /* 0x36 */ u8 mIsDrawn;
     /* 0x38 */ mDoExt_3Dline_c* mpLines;
+#if TARGET_PC
+    u8 mInterpLineKind;
+    f32 mInterpLineF;
+    u16 mInterpLineU16;
+#endif
 };
 
 class mDoExt_3DlineMat2_c : public mDoExt_3DlineMat1_c {
@@ -616,6 +632,9 @@ public:
     void setMatDark(mDoExt_3DlineMat_c* i_mat) { setMat(i_mat); }
 
     void setMat(mDoExt_3DlineMat_c*);
+#if TARGET_PC
+    mDoExt_3DlineMat_c* getFirstMat() const { return mp3DlineMat; }
+#endif
     virtual void draw();
     virtual ~mDoExt_3DlineMatSortPacket() {}