Fix origin returned by IQM's LerpTag

It use to return pose joint's offset from base at the lerped frame, now it returns the joint's origin at the lerped frame.

Patch by Axel Isouard and Zack Middleton.

1 files changed, 40 insertions, 15 deletions

diff --git a/src/renderergl1/tr_model_iqm.c b/src/renderergl1/tr_model_iqm.c
index 720e4a23..b7d474be 100644
--- a/src/renderergl1/tr_model_iqm.c
+++ b/src/renderergl1/tr_model_iqm.c
@@ -52,6 +52,11 @@ static void Matrix34Multiply( float *a, float *b, float *out ) {
 	out[10] = a[8] * b[2] + a[9] * b[6] + a[10] * b[10];
 	out[11] = a[8] * b[3] + a[9] * b[7] + a[10] * b[11] + a[11];
 }
+static void Matrix34Multiply_OnlySetOrigin( float *a, float *b, float *out ) {
+	out[ 3] = a[0] * b[3] + a[1] * b[7] + a[ 2] * b[11] + a[ 3];
+	out[ 7] = a[4] * b[3] + a[5] * b[7] + a[ 6] * b[11] + a[ 7];
+	out[11] = a[8] * b[3] + a[9] * b[7] + a[10] * b[11] + a[11];
+}
 static void InterpolateMatrix( float *a, float *b, float lerp, float *mat ) {
 	float unLerp = 1.0f - lerp;
 
@@ -133,8 +138,8 @@ qboolean R_LoadIQM( model_t *mod, void *buffer, int filesize, const char *mod_na
 	unsigned short		*framedata;
 	char			*str;
 	int			i, j;
-	float			jointMats[IQM_MAX_JOINTS * 2 * 12];
-	float			*mat;
+	float			jointInvMats[IQM_MAX_JOINTS * 12];
+	float			*mat, *matInv;
 	size_t			size, joint_names;
 	iqmData_t		*iqmData;
 	srfIQModel_t		*surface;
@@ -419,7 +424,8 @@ qboolean R_LoadIQM( model_t *mod, void *buffer, int filesize, const char *mod_na
 	// allocate the model and copy the data
 	size = sizeof(iqmData_t);
 	size += header->num_meshes * sizeof( srfIQModel_t );
-	size += header->num_joints * header->num_frames * 12 * sizeof( float );
+	size += header->num_joints * header->num_frames * 12 * sizeof( float ); // joint mats
+	size += header->num_joints * header->num_frames * 12 * sizeof( float ); // pose mats
 	if(header->ofs_bounds)
 		size += header->num_frames * 6 * sizeof(float);	// model bounds
 	size += header->num_vertexes * 3 * sizeof(float);	// positions
@@ -444,7 +450,8 @@ qboolean R_LoadIQM( model_t *mod, void *buffer, int filesize, const char *mod_na
 	iqmData->num_surfaces = header->num_meshes;
 	iqmData->num_joints   = header->num_joints;
 	iqmData->surfaces     = (srfIQModel_t *)(iqmData + 1);
-	iqmData->poseMats     = (float *) (iqmData->surfaces + iqmData->num_surfaces);
+	iqmData->jointMats    = (float *) (iqmData->surfaces + iqmData->num_surfaces);
+	iqmData->poseMats     = iqmData->jointMats + 12 * header->num_joints * header->num_frames;
 	if(header->ofs_bounds)
 	{
 		iqmData->bounds       = iqmData->poseMats + 12 * header->num_joints * header->num_frames;
@@ -463,8 +470,9 @@ qboolean R_LoadIQM( model_t *mod, void *buffer, int filesize, const char *mod_na
 	iqmData->names        = (char *)(iqmData->triangles + 3 * header->num_triangles);
 
 	// calculate joint matrices and their inverses
-	// they are needed only until the pose matrices are calculated
-	mat = jointMats;
+	// joint inverses are needed only until the pose matrices are calculated
+	mat = iqmData->jointMats;
+	matInv = jointInvMats;
 	joint = (iqmJoint_t *)((byte *)header + header->ofs_joints);
 	for( i = 0; i < header->num_joints; i++, joint++ ) {
 		float baseFrame[12], invBaseFrame[12];
@@ -474,17 +482,17 @@ qboolean R_LoadIQM( model_t *mod, void *buffer, int filesize, const char *mod_na
 
 		if ( joint->parent >= 0 )
 		{
-			Matrix34Multiply( jointMats + 2 * 12 * joint->parent, baseFrame, mat );
-			mat += 12;
-			Matrix34Multiply( invBaseFrame, jointMats + 2 * 12 * joint->parent + 12, mat );
+			Matrix34Multiply( iqmData->jointMats + 12 * joint->parent, baseFrame, mat );
 			mat += 12;
+			Matrix34Multiply( invBaseFrame, jointInvMats + 12 * joint->parent, matInv );
+			matInv += 12;
 		}
 		else
 		{
 			Com_Memcpy( mat, baseFrame,    sizeof(baseFrame)    );
 			mat += 12;
-			Com_Memcpy( mat, invBaseFrame, sizeof(invBaseFrame) );
-			mat += 12;
+			Com_Memcpy( matInv, invBaseFrame, sizeof(invBaseFrame) );
+			matInv += 12;
 		}
 	}
 
@@ -536,13 +544,13 @@ qboolean R_LoadIQM( model_t *mod, void *buffer, int filesize, const char *mod_na
 			JointToMatrix( rotate, scale, translate, mat1 );
 			
 			if( pose->parent >= 0 ) {
-				Matrix34Multiply( jointMats + 12 * 2 * pose->parent,
+				Matrix34Multiply( iqmData->jointMats + 12 * pose->parent,
 						  mat1, mat2 );
 			} else {
 				Com_Memcpy( mat2, mat1, sizeof(mat1) );
 			}
 			
-			Matrix34Multiply( mat2, jointMats + 12 * (2 * j + 1), mat );
+			Matrix34Multiply( mat2, jointInvMats + 12 * j, mat );
 			mat += 12;
 		}
 	}
@@ -862,7 +870,7 @@ void R_AddIQMSurfaces( trRefEntity_t *ent ) {
 }
 
 
-static void ComputeJointMats( iqmData_t *data, int frame, int oldframe,
+static void ComputePoseMats( iqmData_t *data, int frame, int oldframe,
 			      float backlerp, float *mat ) {
 	float	*mat1, *mat2;
 	int	*joint = data->jointParents;
@@ -898,6 +906,23 @@ static void ComputeJointMats( iqmData_t *data, int frame, int oldframe,
 	}
 }
 
+static void ComputeJointMats( iqmData_t *data, int frame, int oldframe,
+			      float backlerp, float *mat ) {
+	float	*mat1;
+	int	i;
+
+	ComputePoseMats( data, frame, oldframe, backlerp, mat );
+
+	for( i = 0; i < data->num_joints; i++ ) {
+		float outmat[12];
+		mat1 = mat + 12 * i;
+
+		Com_Memcpy(outmat, mat1, sizeof(outmat));
+
+		Matrix34Multiply_OnlySetOrigin( outmat, data->jointMats + 12 * i, mat1 );
+	}
+}
+
 
 /*
 =================
@@ -928,7 +953,7 @@ void RB_IQMSurfaceAnim( surfaceType_t *surface ) {
 	RB_CHECKOVERFLOW( surf->num_vertexes, surf->num_triangles * 3 );
 
 	// compute interpolated joint matrices
-	ComputeJointMats( data, frame, oldframe, backlerp, jointMats );
+	ComputePoseMats( data, frame, oldframe, backlerp, jointMats );
 
 	// transform vertexes and fill other data
 	for( i = 0; i < surf->num_vertexes;