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Normal mapping

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bloeys
2024-05-07 05:23:36 +04:00
parent 8c6b1d5821
commit c884d2624d
10 changed files with 337 additions and 110 deletions
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68
meshes/mesh.go
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@ -16,14 +16,38 @@ type SubMesh struct {
}
type Mesh struct {
Name string
Name string
/*
Vao has the following shader attribute layout:
- Loc0: Pos
- Loc1: Normal
- Loc2: UV0
- Loc3: Tangent
- (Optional) Color
Optional stuff appear in the order in this list, depending on what other optional stuff exists.
For example:
- If color exists it will be in Loc3, otherwise it is unset
*/
Vao buffers.VertexArray
SubMeshes []SubMesh
}
var (
// DefaultMeshLoadFlags are the flags always applied when loading a new mesh regardless
// of what post process flags are used when loading a mesh.
//
// Defaults to: asig.PostProcessTriangulate | asig.PostProcessCalcTangentSpace;
// Note: changing this will break the normal lit shaders, which expect tangents to be there
DefaultMeshLoadFlags asig.PostProcess = asig.PostProcessTriangulate | asig.PostProcessCalcTangentSpace
)
func NewMesh(name, modelPath string, postProcessFlags asig.PostProcess) (Mesh, error) {
scene, release, err := asig.ImportFile(modelPath, asig.PostProcessTriangulate|postProcessFlags)
finalPostProcessFlags := DefaultMeshLoadFlags | postProcessFlags
scene, release, err := asig.ImportFile(modelPath, finalPostProcessFlags)
if err != nil {
return Mesh{}, errors.New("Failed to load model. Err: " + err.Error())
}
@ -42,8 +66,17 @@ func NewMesh(name, modelPath string, postProcessFlags asig.PostProcess) (Mesh, e
vbo := buffers.NewVertexBuffer()
ibo := buffers.NewIndexBuffer()
// 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)
// Estimate a useful prealloc capacity based on the first submesh that has vertex pos+normals+tangents+texCoords
vertexBufDataCapacity := len(scene.Meshes[0].Vertices) * 3 * 3 * 3 * 2
// Increase capacity depending on what the mesh has
if len(scene.Meshes[0].ColorSets) > 0 && len(scene.Meshes[0].ColorSets[0]) > 0 {
vertexBufDataCapacity *= 4
}
var vertexBufData []float32 = make([]float32, 0, vertexBufDataCapacity)
// Initial size assumes 3 indices per face
var indexBufData []uint32 = make([]uint32, 0, len(scene.Meshes[0].Faces)*3)
// fmt.Printf("\nMesh %s has %d meshe(s) with first mesh having %d vertices\n", name, len(scene.Meshes), len(scene.Meshes[0].Vertices))
@ -52,12 +85,25 @@ func NewMesh(name, modelPath string, postProcessFlags asig.PostProcess) (Mesh, e
sceneMesh := scene.Meshes[i]
// We always want tangents and UV0
if len(sceneMesh.Tangents) == 0 {
sceneMesh.Tangents = make([]gglm.Vec3, len(sceneMesh.Vertices))
}
if len(sceneMesh.TexCoords[0]) == 0 {
sceneMesh.TexCoords[0] = make([]gglm.Vec3, len(sceneMesh.Vertices))
}
layoutToUse := []buffers.Element{{ElementType: buffers.DataTypeVec3}, {ElementType: buffers.DataTypeVec3}, {ElementType: buffers.DataTypeVec2}}
if len(sceneMesh.ColorSets) > 0 && len(sceneMesh.ColorSets[0]) > 0 {
hasColorSet0 := len(sceneMesh.ColorSets) > 0 && len(sceneMesh.ColorSets[0]) > 0
layoutToUse := []buffers.Element{
{ElementType: buffers.DataTypeVec3}, // Position
{ElementType: buffers.DataTypeVec3}, // Normals
{ElementType: buffers.DataTypeVec3}, // Tangents
{ElementType: buffers.DataTypeVec2}, // UV0
}
if hasColorSet0 {
layoutToUse = append(layoutToUse, buffers.Element{ElementType: buffers.DataTypeVec4})
}
@ -79,8 +125,14 @@ func NewMesh(name, modelPath string, postProcessFlags asig.PostProcess) (Mesh, e
}
}
arrs := []arrToInterleave{{V3s: sceneMesh.Vertices}, {V3s: sceneMesh.Normals}, {V2s: v3sToV2s(sceneMesh.TexCoords[0])}}
if len(sceneMesh.ColorSets) > 0 && len(sceneMesh.ColorSets[0]) > 0 {
arrs := []arrToInterleave{
{V3s: sceneMesh.Vertices},
{V3s: sceneMesh.Normals},
{V3s: sceneMesh.Tangents},
{V2s: v3sToV2s(sceneMesh.TexCoords[0])},
}
if hasColorSet0 {
arrs = append(arrs, arrToInterleave{V4s: sceneMesh.ColorSets[0]})
}