blend_stack.cpp

#include "blend_stack.h"
#include "misc.h"

void
PlayAnimation(blend_stack* BlendStack, Anim::animation* NewAnim, int32_t IndexInSet,
              float LocalAnimTime, float GlobalTime, float BlendInTime, bool Mirror, bool Loop)
{
  assert(NewAnim);

  blend_in_info NewBlend        = {};
  NewBlend.Animation            = NewAnim;
  NewBlend.IndexInSet           = IndexInSet;
  NewBlend.GlobalAnimStartTime  = GlobalTime - LocalAnimTime;
  NewBlend.GlobalBlendStartTime = GlobalTime;
  NewBlend.BlendDuration        = BlendInTime;
  NewBlend.Mirror               = Mirror;
  NewBlend.Loop                 = Loop;

  BlendStack->Push(NewBlend);
}

// Deferred execution inside of the animation system
void
BlendStackBlendFunc(Anim::animation_player* C, void* UserData)
{
  playback_info                     PlaybackInfo = *(playback_info*)UserData;
  const Anim::skeleton_mirror_info* MirrorInfo   = PlaybackInfo.MirrorInfo;
  const blend_stack&                BlendStack   = *PlaybackInfo.BlendStack;
  assert(C->AnimStateCount == BlendStack.Count);

	if(C->AnimStateCount > 0)
	{
    Anim::SampleAtGlobalTime(C, 0, 0, C->States[0].Mirror ? MirrorInfo : NULL);
  }
  for(int i = 1; i < C->AnimStateCount; i++)
  {
    Anim::SampleAtGlobalTime(C, i, 1, C->States[i].Mirror ? MirrorInfo : NULL);
    float t = ClampFloat(0,
                         (C->GlobalTimeSec - BlendStack[i].GlobalBlendStartTime) /
                           BlendStack[i].BlendDuration,
                         1);
    Anim::LinearBlend(C, 0, 1, t, 0);
  }
}