Blend loader: Add texture cache.

src/loaders/blend.nim

@@ -94,6 +94,7 @@ method close*(self: BlendLoader) =
         self.resource = nil
     self.blend_file = nil
     self.cached_materials.clear()
+    self.textures.clear()
 
 method openAssetFile*(self: BlendLoader, path: string) =
     if self.resource != nil:
@@ -204,17 +205,21 @@ method loadTextureImpl*(self: BlendLoader, name: string, img: FNode): Texture =
         return self.engine.newTexture(name,1,1,1,RGBA_f16,pixels=c16.to float32)
     # of 5: # UDIM sequence
     else:
-        assert false, "Image source not supported yet: " & $source
+        assert false, &"Image source not supported yet: {source}, image '{name}'"
 
 method loadTexture*(self: BlendLoader, name: string): Texture =
     # sources:
     # 1 image
     # 4 generated
     # 5 render
+    if name in self.textures:
+        return self.textures[name]
     for img in self.blend_file.named_blocks["IM"]:
         let nm = img.id.name.str.strip2
         if name == nm:
-            return self.loadTextureImpl(name, img)
+            let tex = self.loadTextureImpl(name, img)
+            self.textures[name] = tex
+            return tex
     raise newException(KeyError, "Can't find image " & name)
 
 proc makeMaterialAndTextures(self: BlendLoader;

src/loaders/blend_mesh.nim

@@ -77,6 +77,8 @@ proc pack_normal(v: Vec3): float32 =
             (z)
     let f = cast[float32](i)
     return f - (if f >= 0.0: 1.0 else: -1.0)
+
+
 proc equals[T](a: ArrRef[T], s:seq[T], offset: int): bool =
     for i, v in a:
         if a[i] != s[offset+i]: return false

src/types.nim

@@ -914,6 +914,7 @@ type BlendLoader* = ref object of Loader
     cached_materials*: Table[(FNode, string, bool),
         (string, seq[Varying], OrderedTable[string, string], OrderedTable[string, TexturePixels])] ## private
     resource*: LoadableResource
+    textures*: Table[string, Texture]
     
 template enqueue*(renderer: RenderManager, fun: untyped) =
     ## Run a proc after the renderer has been initialized.