skinning_pars_vertex.glsl

#ifdef USE_SKINNING

	#ifdef BONE_TEXTURE

		uniform sampler2D boneTexture;
		uniform int boneTextureWidth;
		uniform int boneTextureHeight;

		mat4 getBoneMatrix( const in float i ) {

			float j = i * 4.0;
			float x = mod( j, float( boneTextureWidth ) );
			float y = floor( j / float( boneTextureWidth ) );

			float dx = 1.0 / float( boneTextureWidth );
			float dy = 1.0 / float( boneTextureHeight );

			y = dy * ( y + 0.5 );

			vec4 v1 = texture2D( boneTexture, vec2( dx * ( x + 0.5 ), y ) );
			vec4 v2 = texture2D( boneTexture, vec2( dx * ( x + 1.5 ), y ) );
			vec4 v3 = texture2D( boneTexture, vec2( dx * ( x + 2.5 ), y ) );
			vec4 v4 = texture2D( boneTexture, vec2( dx * ( x + 3.5 ), y ) );

			mat4 bone = mat4( v1, v2, v3, v4 );

			return bone;

		}

	#else

		uniform mat4 boneGlobalMatrices[ MAX_BONES ];

		mat4 getBoneMatrix( const in float i ) {

			mat4 bone = boneGlobalMatrices[ int(i) ];
			return bone;

		}

	#endif

#endif