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Basic submeshe support

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bloeys
2022-10-07 05:50:48 +04:00
parent 1b858bd4ac
commit 3071b52c85
4 changed files with 78 additions and 31 deletions
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85
meshes/mesh.go
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@ -10,9 +10,16 @@ import (
"github.com/bloeys/nmage/buffers"
)
type SubMesh struct {
BaseVertex int32
BaseIndex uint32
IndexCount int32
}
type Mesh struct {
Name string
Buf buffers.Buffer
Name string
Buf buffers.Buffer
SubMeshes []SubMesh
}
func NewMesh(name, modelPath string, postProcessFlags asig.PostProcess) (*Mesh, error) {
@ -27,32 +34,68 @@ func NewMesh(name, modelPath string, postProcessFlags asig.PostProcess) (*Mesh,
return nil, errors.New("No meshes found in file: " + modelPath)
}
mesh := &Mesh{Name: name}
sceneMesh := scene.Meshes[0]
mesh.Buf = buffers.NewBuffer()
if len(sceneMesh.TexCoords[0]) == 0 {
sceneMesh.TexCoords[0] = make([]gglm.Vec3, len(sceneMesh.Vertices))
mesh := &Mesh{
Name: name,
Buf: buffers.NewBuffer(),
SubMeshes: make([]SubMesh, 0, 1),
}
layoutToUse := []buffers.Element{{ElementType: buffers.DataTypeVec3}, {ElementType: buffers.DataTypeVec3}, {ElementType: buffers.DataTypeVec2}}
// Initial sizes assuming one submesh that has vertex pos+normals+texCoords, and 3 indices per face
var vertexBufData []float32 = make([]float32, 0, len(scene.Meshes[0].Vertices)*3*3*2)
var indexBufData []uint32 = make([]uint32, 0, len(scene.Meshes[0].Faces)*3)
if len(sceneMesh.ColorSets) > 0 && len(sceneMesh.ColorSets[0]) > 0 {
layoutToUse = append(layoutToUse, buffers.Element{ElementType: buffers.DataTypeVec4})
}
mesh.Buf.SetLayout(layoutToUse...)
for i := 0; i < len(scene.Meshes); i++ {
var values []float32
arrs := []arrToInterleave{{V3s: sceneMesh.Vertices}, {V3s: sceneMesh.Normals}, {V2s: v3sToV2s(sceneMesh.TexCoords[0])}}
sceneMesh := scene.Meshes[i]
if len(sceneMesh.ColorSets) > 0 && len(sceneMesh.ColorSets[0]) > 0 {
arrs = append(arrs, arrToInterleave{V4s: sceneMesh.ColorSets[0]})
if len(sceneMesh.TexCoords[0]) == 0 {
sceneMesh.TexCoords[0] = make([]gglm.Vec3, len(sceneMesh.Vertices))
println("Zeroing tex coords for submesh", i)
}
layoutToUse := []buffers.Element{{ElementType: buffers.DataTypeVec3}, {ElementType: buffers.DataTypeVec3}, {ElementType: buffers.DataTypeVec2}}
if len(sceneMesh.ColorSets) > 0 && len(sceneMesh.ColorSets[0]) > 0 {
layoutToUse = append(layoutToUse, buffers.Element{ElementType: buffers.DataTypeVec4})
}
if i == 0 {
mesh.Buf.SetLayout(layoutToUse...)
} else {
// @NOTE: Require that all submeshes have the same vertex buffer layout
firstSubmeshLayout := mesh.Buf.GetLayout()
assert.T(len(firstSubmeshLayout) == len(layoutToUse), fmt.Sprintf("Vertex layout of submesh %d does not equal vertex layout of the first submesh. Original layout: %v; This layout: %v", i, firstSubmeshLayout, layoutToUse))
for i := 0; i < len(firstSubmeshLayout); i++ {
if firstSubmeshLayout[i].ElementType != layoutToUse[i].ElementType {
panic(fmt.Sprintf("Vertex layout of submesh %d does not equal vertex layout of the first submesh. Original layout: %v; This layout: %v", i, firstSubmeshLayout, layoutToUse))
}
}
}
arrs := []arrToInterleave{{V3s: sceneMesh.Vertices}, {V3s: sceneMesh.Normals}, {V2s: v3sToV2s(sceneMesh.TexCoords[0])}}
if len(sceneMesh.ColorSets) > 0 && len(sceneMesh.ColorSets[0]) > 0 {
arrs = append(arrs, arrToInterleave{V4s: sceneMesh.ColorSets[0]})
}
indices := flattenFaces(sceneMesh.Faces)
mesh.SubMeshes = append(mesh.SubMeshes, SubMesh{
// Index of the vertex to start from (e.g. if index buffer says use vertex 5, and BaseVertex=3, the vertex used will be vertex 8)
BaseVertex: int32(len(vertexBufData)*4) / mesh.Buf.Stride,
// Which index (in the index buffer) to start from
BaseIndex: uint32(len(indexBufData)),
// How many indices in this submesh
IndexCount: int32(len(indices)),
})
vertexBufData = append(vertexBufData, interleave(arrs...)...)
indexBufData = append(indexBufData, indices...)
}
values = interleave(arrs...)
mesh.Buf.SetData(values)
mesh.Buf.SetIndexBufData(flattenFaces(sceneMesh.Faces))
// fmt.Printf("!!! Vertex count: %d; Submeshes: %+v\n", len(vertexBufData)*4/int(mesh.Buf.Stride), mesh.SubMeshes)
mesh.Buf.SetData(vertexBufData)
mesh.Buf.SetIndexBufData(indexBufData)
return mesh, nil
}