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Merge pull request #71529 from clayjohn/IM-oct

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Update ImmediateMesh to use octohedral encoded normals
This commit is contained in:
Rémi Verschelde 2023-01-17 10:56:07 +01:00
commit 63dfdf4f89
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1 changed files with 6 additions and 11 deletions
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17
scene/resources/immediate_mesh.cpp
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@ -194,25 +194,20 @@ void ImmediateMesh::surface_end() {
if (uses_normals) {
uint32_t *normal = (uint32_t *)&surface_vertex_ptr[i * vertex_stride + normal_offset];
Vector3 n = normals[i] * Vector3(0.5, 0.5, 0.5) + Vector3(0.5, 0.5, 0.5);
Vector2 n = normals[i].octahedron_encode();
uint32_t value = 0;
value |= CLAMP(int(n.x * 1023.0), 0, 1023);
value |= CLAMP(int(n.y * 1023.0), 0, 1023) << 10;
value |= CLAMP(int(n.z * 1023.0), 0, 1023) << 20;
value |= (uint16_t)CLAMP(n.x * 65535, 0, 65535);
value |= (uint16_t)CLAMP(n.y * 65535, 0, 65535) << 16;
*normal = value;
}
if (uses_tangents) {
uint32_t *tangent = (uint32_t *)&surface_vertex_ptr[i * vertex_stride + tangent_offset];
Plane t = tangents[i];
Vector2 t = tangents[i].normal.octahedron_tangent_encode(tangents[i].d);
uint32_t value = 0;
value |= CLAMP(int((t.normal.x * 0.5 + 0.5) * 1023.0), 0, 1023);
value |= CLAMP(int((t.normal.y * 0.5 + 0.5) * 1023.0), 0, 1023) << 10;
value |= CLAMP(int((t.normal.z * 0.5 + 0.5) * 1023.0), 0, 1023) << 20;
if (t.d > 0) {
value |= 3UL << 30;
}
value |= (uint16_t)CLAMP(t.x * 65535, 0, 65535);
value |= (uint16_t)CLAMP(t.y * 65535, 0, 65535) << 16;
*tangent = value;
}