31bd4ecbbc
# Objective Load skeletal weights and indices from GLTF files. Animate meshes. ## Solution - Load skeletal weights and indices from GLTF files. - Added `SkinnedMesh` component and ` SkinnedMeshInverseBindPose` asset - Added `extract_skinned_meshes` to extract joint matrices. - Added queue phase systems for enqueuing the buffer writes. Some notes: - This ports part of # #2359 to the current main. - This generates new `BufferVec`s and bind groups every frame. The expectation here is that the number of `Query::get` calls during extract is probably going to be the stronger bottleneck, with up to 256 calls per skinned mesh. Until that is optimized, caching buffers and bind groups is probably a non-concern. - Unfortunately, due to the uniform size requirements, this means a 16KB buffer is allocated for every skinned mesh every frame. There's probably a few ways to get around this, but most of them require either compute shaders or storage buffers, which are both incompatible with WebGL2. Co-authored-by: james7132 <contact@jamessliu.com> Co-authored-by: François <mockersf@gmail.com> Co-authored-by: James Liu <contact@jamessliu.com>
66 lines
1.6 KiB
WebGPU Shading Language
66 lines
1.6 KiB
WebGPU Shading Language
// If using this WGSL snippet as an #import, a dedicated
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// "joint_matricies" uniform of type SkinnedMesh must be added in the
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// main shader.
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#define_import_path bevy_pbr::skinning
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/// HACK: This works around naga not supporting matrix addition in SPIR-V
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// translations. See https://github.com/gfx-rs/naga/issues/1527
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fn add_matrix(
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a: mat4x4<f32>,
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b: mat4x4<f32>,
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) -> mat4x4<f32> {
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return mat4x4<f32>(
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a.x + b.x,
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a.y + b.y,
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a.z + b.z,
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a.w + b.w,
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);
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}
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fn skin_model(
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indexes: vec4<u32>,
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weights: vec4<f32>,
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) -> mat4x4<f32> {
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var matrix = weights.x * joint_matrices.data[indexes.x];
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matrix = add_matrix(matrix, weights.y * joint_matrices.data[indexes.y]);
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matrix = add_matrix(matrix, weights.z * joint_matrices.data[indexes.z]);
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return add_matrix(matrix, weights.w * joint_matrices.data[indexes.w]);
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}
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fn inverse_transpose_3x3(in: mat3x3<f32>) -> mat3x3<f32> {
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let x = cross(in.y, in.z);
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let y = cross(in.z, in.x);
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let z = cross(in.x, in.y);
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let det = dot(in.z, z);
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return mat3x3<f32>(
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x / det,
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y / det,
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z / det
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);
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}
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fn skin_normals(
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model: mat4x4<f32>,
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normal: vec3<f32>,
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) -> vec3<f32> {
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return inverse_transpose_3x3(mat3x3<f32>(
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model[0].xyz,
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model[1].xyz,
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model[2].xyz
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)) * normal;
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}
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fn skin_tangents(
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model: mat4x4<f32>,
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tangent: vec4<f32>,
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) -> vec4<f32> {
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return vec4<f32>(
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mat3x3<f32>(
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model[0].xyz,
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model[1].xyz,
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model[2].xyz
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) * tangent.xyz,
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tangent.w
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);
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} |