zUI close to equivalent (#285)

* Decomp zUI_Render

* zUI data and zUI_Render better

* Decomp remaining zUI data

* Fix zUI_PreUpdate/zUI_ScenePortalUpdate

* More closely matching zUI code

* Match zUI_PreUpdate with ternary trick

src/SB/Core/x/xModel.h

@@ -63,6 +63,11 @@ struct xModelInstance
     } anim_coll;
 };
 
+// NOTE (Square): Theses are based on the access pattern found in zUI_Render.
+// I doubt they wrote this out by hand every time, but I'm just guessing on the macro here.
+#define XMODELINSTANCE_GET_SRCBLEND(inst) (((inst)->PipeFlags >> 0x8) & 0xf)
+#define XMODELINSTANCE_GET_DSTBLEND(inst) (((inst)->PipeFlags >> 0xc) & 0xf)
+
 struct xModelTag
 {
     xVec3 v;
@@ -143,4 +148,4 @@ void xModel_SceneExit(RpWorld* world);
 xSphere* xModelGetLocalSBound(xModelInstance* model);
 void xModelGetBoneMat(xMat4x3& mat, const xModelInstance& model, ulong32 index);
 
-#endif
+#endif

src/SB/Core/x/xScrFx.h

@@ -11,6 +11,7 @@ void xScrFxRender(RwCamera*);
 void xScrFxDrawScreenSizeRectangle();
 void xScrFxFade(iColor_tag* base, iColor_tag* dest, float32 seconds, void (*callback)(),
                 int32 hold);
+int32 xScrFxIsLetterbox();
 void xScrFxLetterboxReset();
 int32 xScrFXGlareAdd(xVec3* pos, float32 life, float32 intensity, float32 size, float32 r,
                      float32 g, float32 b, float32 a, RwRaster* raster);