declare const _default: "\n\nattribute vec4 vertex_boneWeights;\nattribute vec4 vertex_boneIndices;\n\nuniform highp sampler2D texture_poseMap;\nuniform vec4 texture_poseMapSize;\n\nvoid getBoneMatrix(const in float index, out vec4 v1, out vec4 v2, out vec4 v3) {\n\n    float i = float(index);\n    float j = i * 3.0;\n    float dx = texture_poseMapSize.z;\n    float dy = texture_poseMapSize.w;\n    \n    float y = floor(j * dx);\n    float x = j - (y * texture_poseMapSize.x);\n    y = dy * (y + 0.5);\n\n    // read elements of 4x3 matrix\n    v1 = texture2D(texture_poseMap, vec2(dx * (x + 0.5), y));\n    v2 = texture2D(texture_poseMap, vec2(dx * (x + 1.5), y));\n    v3 = texture2D(texture_poseMap, vec2(dx * (x + 2.5), y));\n}\n\nmat4 getSkinMatrix(const in vec4 indices, const in vec4 weights) {\n    // get 4 bone matrices\n    vec4 a1, a2, a3;\n    getBoneMatrix(indices.x, a1, a2, a3);\n\n    vec4 b1, b2, b3;\n    getBoneMatrix(indices.y, b1, b2, b3);\n\n    vec4 c1, c2, c3;\n    getBoneMatrix(indices.z, c1, c2, c3);\n\n    vec4 d1, d2, d3;\n    getBoneMatrix(indices.w, d1, d2, d3);\n\n    // multiply them by weights and add up to get final 4x3 matrix\n    vec4 v1 = a1 * weights.x + b1 * weights.y + c1 * weights.z + d1 * weights.w;\n    vec4 v2 = a2 * weights.x + b2 * weights.y + c2 * weights.z + d2 * weights.w;\n    vec4 v3 = a3 * weights.x + b3 * weights.y + c3 * weights.z + d3 * weights.w;\n\n    // add up weights\n    float one = dot(weights, vec4(1.0));\n\n    // transpose to 4x4 matrix\n    return mat4(\n        v1.x, v2.x, v3.x, 0,\n        v1.y, v2.y, v3.y, 0,\n        v1.z, v2.z, v3.z, 0,\n        v1.w, v2.w, v3.w, one\n    );\n}\n";
export default _default;