t3dskeleton.h

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#ifndef TINY3D_T3DSKELETON_H
#define TINY3D_T3DSKELETON_H
 
#include "t3dmodel.h"
 
#ifdef __cplusplus
extern "C"
{
#endif
 
typedef struct {
  T3DMat4 matrix;
  T3DVec3 scale;
  T3DQuat rotation;
  T3DVec3 position;
  int32_t hasChanged;
} T3DBone;
 
typedef struct {
  T3DBone* bones;
  T3DMat4FP* boneMatricesFP; // fixed point matrix, used for rendering
  uint8_t bufferCount; // number of matrices buffers
  uint8_t currentBufferIdx;
  const T3DChunkSkeleton* skeletonRef; // reference to the model, defines skeleton structure
} T3DSkeleton;
 
T3DSkeleton t3d_skeleton_create_buffered(const T3DModel *model, int bufferCount);
 
static inline T3DSkeleton t3d_skeleton_create(const T3DModel *model) {
  return t3d_skeleton_create_buffered(model, 1);
}
 
static inline void t3d_skeleton_use(const T3DSkeleton *skel) {
  if(skel->bufferCount > 1) {
    void* mat = skel->boneMatricesFP + skel->currentBufferIdx * skel->skeletonRef->boneCount;
    t3d_segment_set(T3D_SEGMENT_SKELETON, mat);
  }
}
 
T3DSkeleton t3d_skeleton_clone(const T3DSkeleton *skel, bool useMatrices);
 
void t3d_skeleton_reset(T3DSkeleton *skeleton);
 
void t3d_skeleton_blend(const T3DSkeleton *skelRes, const T3DSkeleton *skelA, const T3DSkeleton *skelB, float factor);
 
void t3d_skeleton_update(T3DSkeleton *skeleton);
 
void t3d_skeleton_destroy(T3DSkeleton* skeleton);
 
int t3d_skeleton_find_bone(T3DSkeleton* skeleton, const char* name);
 
static inline T3DVec3 t3d_skeleton_get_bone_pos_model_space(const T3DSkeleton *skeleton, int boneIdx){
  assertf(boneIdx >= 0 && boneIdx < skeleton->skeletonRef->boneCount, "Bone index is out of bounds, idx: %i, boneCount: %i", boneIdx, skeleton->skeletonRef->boneCount);
  // Access the bone at the given index
  const T3DBone *bone = &skeleton->bones[boneIdx];
 
  // Extract the position from the matrix.
  return (T3DVec3) {{
    bone->matrix.m[3][0],
    bone->matrix.m[3][1],
    bone->matrix.m[3][2]
  }};
}
 
static inline void t3d_model_draw_skinned(const T3DModel* model, const T3DSkeleton* skeleton) {
  t3d_model_draw_custom(model, (T3DModelDrawConf){
    .userData = NULL,
    .tileCb = NULL,
    .filterCb = NULL,
    .matrices = skeleton->bufferCount == 1
      ? skeleton->boneMatricesFP
      : (const T3DMat4FP*)t3d_segment_placeholder(T3D_SEGMENT_SKELETON)
  });
}
 
#ifdef __cplusplus
}
#endif
 
#endif //TINY3D_T3DSKELETON_H