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Textures + basic asset loading system+ uvs

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bloeys
2022-02-05 23:00:19 +04:00
parent 2bfba880a9
commit 56e10049e9
7 changed files with 213 additions and 35 deletions
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80
meshes/mesh.go
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@ -7,12 +7,15 @@ import (
"github.com/bloeys/assimp-go/asig"
"github.com/bloeys/gglm/gglm"
"github.com/bloeys/nmage/asserts"
"github.com/bloeys/nmage/assets"
"github.com/bloeys/nmage/buffers"
"github.com/bloeys/nmage/logging"
)
type Mesh struct {
Name string
Buf buffers.Buffer
Name string
TextureIDs []uint32
Buf buffers.Buffer
}
func NewMesh(name, modelPath string, postProcessFlags asig.PostProcess) (*Mesh, error) {
@ -31,41 +34,71 @@ func NewMesh(name, modelPath string, postProcessFlags asig.PostProcess) (*Mesh,
sceneMesh := scene.Meshes[0]
mesh.Buf = buffers.NewBuffer()
layoutToUse := []buffers.Element{{ElementType: buffers.DataTypeVec3}, {ElementType: buffers.DataTypeVec3}}
if len(sceneMesh.ColorSets) > 0 {
asserts.T(len(sceneMesh.TexCoords[0]) > 0, "Mesh has no UV0")
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})
}
mesh.Buf.SetLayout(layoutToUse...)
var values []float32
if len(sceneMesh.ColorSets) > 0 && len(sceneMesh.ColorSets[0]) > 0 {
values = interleave(
arrToInterleave{V3s: sceneMesh.Vertices},
arrToInterleave{V3s: sceneMesh.Normals},
arrToInterleave{V4s: sceneMesh.ColorSets[0]},
)
} else {
values = interleave(
arrToInterleave{V3s: sceneMesh.Vertices},
arrToInterleave{V3s: sceneMesh.Normals},
)
//Load diffuse textures
mat := scene.Materials[sceneMesh.MaterialIndex]
if asig.GetMaterialTextureCount(mat, asig.TextureTypeDiffuse) > 0 {
texInfo, err := asig.GetMaterialTexture(mat, asig.TextureTypeDiffuse, 0)
if err != nil {
logging.ErrLog.Fatalf("Failed to get material texture of index 0. Err: %e\n", err)
}
tex, err := assets.LoadPNG(texInfo.Path)
if err != nil {
logging.ErrLog.Fatalf("Loading PNG with path '%s' failed. Err: %e\n", texInfo.Path, err)
}
mesh.TextureIDs = append(mesh.TextureIDs, tex.TexID)
}
var values []float32
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]})
}
values = interleave(arrs...)
mesh.Buf.SetData(values)
mesh.Buf.SetIndexBufData(flattenFaces(sceneMesh.Faces))
return mesh, nil
}
func v3sToV2s(v3s []gglm.Vec3) []gglm.Vec2 {
v2s := make([]gglm.Vec2, len(v3s))
for i := 0; i < len(v3s); i++ {
v2s[i] = gglm.Vec2{
Data: [2]float32{v3s[i].X(), v3s[i].Y()},
}
}
return v2s
}
type arrToInterleave struct {
V2s []gglm.Vec2
V3s []gglm.Vec3
V4s []gglm.Vec4
}
func (a *arrToInterleave) get(i int) []float32 {
asserts.T(len(a.V2s) == 0 || len(a.V3s) == 0, "One array should be set in arrToInterleave, but both arrays are set")
asserts.T(len(a.V2s) == 0 || len(a.V4s) == 0, "One array should be set in arrToInterleave, but both arrays are set")
asserts.T(len(a.V3s) == 0 || len(a.V4s) == 0, "One array should be set in arrToInterleave, but both arrays are set")
if len(a.V3s) > 0 {
if len(a.V2s) > 0 {
return a.V2s[i].Data[:]
} else if len(a.V3s) > 0 {
return a.V3s[i].Data[:]
} else {
return a.V4s[i].Data[:]
@ -75,21 +108,26 @@ func (a *arrToInterleave) get(i int) []float32 {
func interleave(arrs ...arrToInterleave) []float32 {
asserts.T(len(arrs) > 0, "No input sent to interleave")
asserts.T(len(arrs[0].V3s) > 0 || len(arrs[0].V4s) > 0, "Interleave arrays are empty")
asserts.T(len(arrs[0].V2s) > 0 || len(arrs[0].V3s) > 0 || len(arrs[0].V4s) > 0, "Interleave arrays are empty")
elementCount := 0
if len(arrs[0].V3s) > 0 {
if len(arrs[0].V2s) > 0 {
elementCount = len(arrs[0].V2s)
} else if len(arrs[0].V3s) > 0 {
elementCount = len(arrs[0].V3s)
} else {
elementCount = len(arrs[0].V4s)
}
//Calculate final size of the float buffer
totalSize := 0
for i := 0; i < len(arrs); i++ {
asserts.T(len(arrs[i].V3s) == elementCount || len(arrs[i].V4s) == elementCount, "Mesh vertex data given to interleave is not the same length")
asserts.T(len(arrs[i].V2s) == elementCount || len(arrs[i].V3s) == elementCount || len(arrs[i].V4s) == elementCount, "Mesh vertex data given to interleave is not the same length")
if len(arrs[i].V3s) > 0 {
if len(arrs[i].V2s) > 0 {
totalSize += len(arrs[i].V2s) * 2
} else if len(arrs[i].V3s) > 0 {
totalSize += len(arrs[i].V3s) * 3
} else {
totalSize += len(arrs[i].V4s) * 4