changeset 224:634c302869d5

did: refactor gpu data, fix some errors
author Sam <sam@basx.dev>
date Mon, 15 May 2023 14:25:04 +0700
parents 4c0a4b6902ff
children d078b19bf531
files src/semicongine/core/gpu_data.nim src/semicongine/mesh.nim src/semicongine/resources/mesh.nim
diffstat 3 files changed, 391 insertions(+), 322 deletions(-) [+]
line wrap: on
line diff
--- a/src/semicongine/core/gpu_data.nim	Mon May 15 00:36:25 2023 +0700
+++ b/src/semicongine/core/gpu_data.nim	Mon May 15 14:25:04 2023 +0700
@@ -101,48 +101,48 @@
   DataList* = object
     len*: uint32
     case thetype*: DataType
-    of Float32: float32: seq[float32]
-    of Float64: float64: seq[float64]
-    of Int8: int8: seq[int8]
-    of Int16: int16: seq[int16]
-    of Int32: int32: seq[int32]
-    of Int64: int64: seq[int64]
-    of UInt8: uint8: seq[uint8]
-    of UInt16: uint16: seq[uint16]
-    of UInt32: uint32: seq[uint32]
-    of UInt64: uint64: seq[uint64]
-    of Vec2I32: vec2i32: seq[TVec2[int32]]
-    of Vec2I64: vec2i64: seq[TVec2[int64]]
-    of Vec3I32: vec3i32: seq[TVec3[int32]]
-    of Vec3I64: vec3i64: seq[TVec3[int64]]
-    of Vec4I32: vec4i32: seq[TVec4[int32]]
-    of Vec4I64: vec4i64: seq[TVec4[int64]]
-    of Vec2U32: vec2u32: seq[TVec2[uint32]]
-    of Vec2U64: vec2u64: seq[TVec2[uint64]]
-    of Vec3U32: vec3u32: seq[TVec3[uint32]]
-    of Vec3U64: vec3u64: seq[TVec3[uint64]]
-    of Vec4U32: vec4u32: seq[TVec4[uint32]]
-    of Vec4U64: vec4u64: seq[TVec4[uint64]]
-    of Vec2F32: vec2f32: seq[TVec2[float32]]
-    of Vec2F64: vec2f64: seq[TVec2[float64]]
-    of Vec3F32: vec3f32: seq[TVec3[float32]]
-    of Vec3F64: vec3f64: seq[TVec3[float64]]
-    of Vec4F32: vec4f32: seq[TVec4[float32]]
-    of Vec4F64: vec4f64: seq[TVec4[float64]]
-    of Mat2F32: mat2f32: seq[TMat2[float32]]
-    of Mat2F64: mat2f64: seq[TMat2[float64]]
-    of Mat23F32: mat23f32: seq[TMat23[float32]]
-    of Mat23F64: mat23f64: seq[TMat23[float64]]
-    of Mat32F32: mat32f32: seq[TMat32[float32]]
-    of Mat32F64: mat32f64: seq[TMat32[float64]]
-    of Mat3F32: mat3f32: seq[TMat3[float32]]
-    of Mat3F64: mat3f64: seq[TMat3[float64]]
-    of Mat34F32: mat34f32: seq[TMat34[float32]]
-    of Mat34F64: mat34f64: seq[TMat34[float64]]
-    of Mat43F32: mat43f32: seq[TMat43[float32]]
-    of Mat43F64: mat43f64: seq[TMat43[float64]]
-    of Mat4F32: mat4f32*: seq[TMat4[float32]]
-    of Mat4F64: mat4f64: seq[TMat4[float64]]
+    of Float32: float32: ref seq[float32]
+    of Float64: float64: ref seq[float64]
+    of Int8: int8: ref seq[int8]
+    of Int16: int16: ref seq[int16]
+    of Int32: int32: ref seq[int32]
+    of Int64: int64: ref seq[int64]
+    of UInt8: uint8: ref seq[uint8]
+    of UInt16: uint16: ref seq[uint16]
+    of UInt32: uint32: ref seq[uint32]
+    of UInt64: uint64: ref seq[uint64]
+    of Vec2I32: vec2i32: ref seq[TVec2[int32]]
+    of Vec2I64: vec2i64: ref seq[TVec2[int64]]
+    of Vec3I32: vec3i32: ref seq[TVec3[int32]]
+    of Vec3I64: vec3i64: ref seq[TVec3[int64]]
+    of Vec4I32: vec4i32: ref seq[TVec4[int32]]
+    of Vec4I64: vec4i64: ref seq[TVec4[int64]]
+    of Vec2U32: vec2u32: ref seq[TVec2[uint32]]
+    of Vec2U64: vec2u64: ref seq[TVec2[uint64]]
+    of Vec3U32: vec3u32: ref seq[TVec3[uint32]]
+    of Vec3U64: vec3u64: ref seq[TVec3[uint64]]
+    of Vec4U32: vec4u32: ref seq[TVec4[uint32]]
+    of Vec4U64: vec4u64: ref seq[TVec4[uint64]]
+    of Vec2F32: vec2f32: ref seq[TVec2[float32]]
+    of Vec2F64: vec2f64: ref seq[TVec2[float64]]
+    of Vec3F32: vec3f32: ref seq[TVec3[float32]]
+    of Vec3F64: vec3f64: ref seq[TVec3[float64]]
+    of Vec4F32: vec4f32: ref seq[TVec4[float32]]
+    of Vec4F64: vec4f64: ref seq[TVec4[float64]]
+    of Mat2F32: mat2f32: ref seq[TMat2[float32]]
+    of Mat2F64: mat2f64: ref seq[TMat2[float64]]
+    of Mat23F32: mat23f32: ref seq[TMat23[float32]]
+    of Mat23F64: mat23f64: ref seq[TMat23[float64]]
+    of Mat32F32: mat32f32: ref seq[TMat32[float32]]
+    of Mat32F64: mat32f64: ref seq[TMat32[float64]]
+    of Mat3F32: mat3f32: ref seq[TMat3[float32]]
+    of Mat3F64: mat3f64: ref seq[TMat3[float64]]
+    of Mat34F32: mat34f32: ref seq[TMat34[float32]]
+    of Mat34F64: mat34f64: ref seq[TMat34[float64]]
+    of Mat43F32: mat43f32: ref seq[TMat43[float32]]
+    of Mat43F64: mat43f64: ref seq[TMat43[float64]]
+    of Mat4F32: mat4f32*: ref seq[TMat4[float32]]
+    of Mat4F64: mat4f64: ref seq[TMat4[float64]]
     of Sampler2D: discard
   MemoryPerformanceHint* = enum
     PreferFastRead, PreferFastWrite
@@ -349,7 +349,64 @@
   elif T is TMat4[float64]: value.mat4f64
   else: {.error: "Virtual datatype has no value" .}
 
-func getValues*[T: GPUType|int|uint|float](value: DataList): seq[T] =
+func newDataList*(thetype: DataType): DataList =
+  result = DataList(thetype: thetype)
+  case result.thetype
+    of Float32: result.float32 = new seq[float32]
+    of Float64: result.float64 = new seq[float64]
+    of Int8: result.int8 = new seq[int8]
+    of Int16: result.int16 = new seq[int16]
+    of Int32: result.int32 = new seq[int32]
+    of Int64: result.int64 = new seq[int64]
+    of UInt8: result.uint8 = new seq[uint8]
+    of UInt16: result.uint16 = new seq[uint16]
+    of UInt32: result.uint32 = new seq[uint32]
+    of UInt64: result.uint64 = new seq[uint64]
+    of Vec2I32: result.vec2i32 = new seq[TVec2[int32]]
+    of Vec2I64: result.vec2i64 = new seq[TVec2[int64]]
+    of Vec3I32: result.vec3i32 = new seq[TVec3[int32]]
+    of Vec3I64: result.vec3i64 = new seq[TVec3[int64]]
+    of Vec4I32: result.vec4i32 = new seq[TVec4[int32]]
+    of Vec4I64: result.vec4i64 = new seq[TVec4[int64]]
+    of Vec2U32: result.vec2u32 = new seq[TVec2[uint32]]
+    of Vec2U64: result.vec2u64 = new seq[TVec2[uint64]]
+    of Vec3U32: result.vec3u32 = new seq[TVec3[uint32]]
+    of Vec3U64: result.vec3u64 = new seq[TVec3[uint64]]
+    of Vec4U32: result.vec4u32 = new seq[TVec4[uint32]]
+    of Vec4U64: result.vec4u64 = new seq[TVec4[uint64]]
+    of Vec2F32: result.vec2f32 = new seq[TVec2[float32]]
+    of Vec2F64: result.vec2f64 = new seq[TVec2[float64]]
+    of Vec3F32: result.vec3f32 = new seq[TVec3[float32]]
+    of Vec3F64: result.vec3f64 = new seq[TVec3[float64]]
+    of Vec4F32: result.vec4f32 = new seq[TVec4[float32]]
+    of Vec4F64: result.vec4f64 = new seq[TVec4[float64]]
+    of Mat2F32: result.mat2f32 = new seq[TMat2[float32]]
+    of Mat2F64: result.mat2f64 = new seq[TMat2[float64]]
+    of Mat23F32: result.mat23f32 = new seq[TMat23[float32]]
+    of Mat23F64: result.mat23f64 = new seq[TMat23[float64]]
+    of Mat32F32: result.mat32f32 = new seq[TMat32[float32]]
+    of Mat32F64: result.mat32f64 = new seq[TMat32[float64]]
+    of Mat3F32: result.mat3f32 = new seq[TMat3[float32]]
+    of Mat3F64: result.mat3f64 = new seq[TMat3[float64]]
+    of Mat34F32: result.mat34f32 = new seq[TMat34[float32]]
+    of Mat34F64: result.mat34f64 = new seq[TMat34[float64]]
+    of Mat43F32: result.mat43f32 = new seq[TMat43[float32]]
+    of Mat43F64: result.mat43f64 = new seq[TMat43[float64]]
+    of Mat4F32: result.mat4f32 = new seq[TMat4[float32]]
+    of Mat4F64: result.mat4f64 = new seq[TMat4[float64]]
+    of Sampler2D: discard
+
+func newDataList*[T: GPUType](len=0): DataList =
+  result = newDataList(getDataType[T]())
+  if len > 0:
+    result.initData(len)
+
+func newDataList*[T: GPUType](data: seq[T]): DataList =
+  result = newDataList(getDataType[T]())
+  result.setValues[T](data)
+
+
+func getValues*[T: GPUType|int|uint|float](value: DataList): ref seq[T] =
   when T is float32: value.float32
   elif T is float64: value.float64
   elif T is int8: value.int8
@@ -452,95 +509,95 @@
     return (nil, 0'u32)
   result[1] = value.thetype.size * value.len
   case value.thetype
-    of Float32: result[0] = addr value.float32[0]
-    of Float64: result[0] = addr value.float64[0]
-    of Int8: result[0] = addr value.int8[0]
-    of Int16: result[0] = addr value.int16[0]
-    of Int32: result[0] = addr value.int32[0]
-    of Int64: result[0] = addr value.int64[0]
-    of UInt8: result[0] = addr value.uint8[0]
-    of UInt16: result[0] = addr value.uint16[0]
-    of UInt32: result[0] = addr value.uint32[0]
-    of UInt64: result[0] = addr value.uint64[0]
-    of Vec2I32: result[0] = addr value.vec2i32[0]
-    of Vec2I64: result[0] = addr value.vec2i64[0]
-    of Vec3I32: result[0] = addr value.vec3i32[0]
-    of Vec3I64: result[0] = addr value.vec3i64[0]
-    of Vec4I32: result[0] = addr value.vec4i32[0]
-    of Vec4I64: result[0] = addr value.vec4i64[0]
-    of Vec2U32: result[0] = addr value.vec2u32[0]
-    of Vec2U64: result[0] = addr value.vec2u64[0]
-    of Vec3U32: result[0] = addr value.vec3u32[0]
-    of Vec3U64: result[0] = addr value.vec3u64[0]
-    of Vec4U32: result[0] = addr value.vec4u32[0]
-    of Vec4U64: result[0] = addr value.vec4u64[0]
-    of Vec2F32: result[0] = addr value.vec2f32[0]
-    of Vec2F64: result[0] = addr value.vec2f64[0]
-    of Vec3F32: result[0] = addr value.vec3f32[0]
-    of Vec3F64: result[0] = addr value.vec3f64[0]
-    of Vec4F32: result[0] = addr value.vec4f32[0]
-    of Vec4F64: result[0] = addr value.vec4f64[0]
-    of Mat2F32: result[0] = addr value.mat2f32[0]
-    of Mat2F64: result[0] = addr value.mat2f64[0]
-    of Mat23F32: result[0] = addr value.mat23f32[0]
-    of Mat23F64: result[0] = addr value.mat23f64[0]
-    of Mat32F32: result[0] = addr value.mat32f32[0]
-    of Mat32F64: result[0] = addr value.mat32f64[0]
-    of Mat3F32: result[0] = addr value.mat3f32[0]
-    of Mat3F64: result[0] = addr value.mat3f64[0]
-    of Mat34F32: result[0] = addr value.mat34f32[0]
-    of Mat34F64: result[0] = addr value.mat34f64[0]
-    of Mat43F32: result[0] = addr value.mat43f32[0]
-    of Mat43F64: result[0] = addr value.mat43f64[0]
-    of Mat4F32: result[0] = addr value.mat4f32[0]
-    of Mat4F64: result[0] = addr value.mat4f64[0]
+    of Float32: result[0] = addr value.float32[][0]
+    of Float64: result[0] = addr value.float64[][0]
+    of Int8: result[0] = addr value.int8[][0]
+    of Int16: result[0] = addr value.int16[][0]
+    of Int32: result[0] = addr value.int32[][0]
+    of Int64: result[0] = addr value.int64[][0]
+    of UInt8: result[0] = addr value.uint8[][0]
+    of UInt16: result[0] = addr value.uint16[][0]
+    of UInt32: result[0] = addr value.uint32[][0]
+    of UInt64: result[0] = addr value.uint64[][0]
+    of Vec2I32: result[0] = addr value.vec2i32[][0]
+    of Vec2I64: result[0] = addr value.vec2i64[][0]
+    of Vec3I32: result[0] = addr value.vec3i32[][0]
+    of Vec3I64: result[0] = addr value.vec3i64[][0]
+    of Vec4I32: result[0] = addr value.vec4i32[][0]
+    of Vec4I64: result[0] = addr value.vec4i64[][0]
+    of Vec2U32: result[0] = addr value.vec2u32[][0]
+    of Vec2U64: result[0] = addr value.vec2u64[][0]
+    of Vec3U32: result[0] = addr value.vec3u32[][0]
+    of Vec3U64: result[0] = addr value.vec3u64[][0]
+    of Vec4U32: result[0] = addr value.vec4u32[][0]
+    of Vec4U64: result[0] = addr value.vec4u64[][0]
+    of Vec2F32: result[0] = addr value.vec2f32[][0]
+    of Vec2F64: result[0] = addr value.vec2f64[][0]
+    of Vec3F32: result[0] = addr value.vec3f32[][0]
+    of Vec3F64: result[0] = addr value.vec3f64[][0]
+    of Vec4F32: result[0] = addr value.vec4f32[][0]
+    of Vec4F64: result[0] = addr value.vec4f64[][0]
+    of Mat2F32: result[0] = addr value.mat2f32[][0]
+    of Mat2F64: result[0] = addr value.mat2f64[][0]
+    of Mat23F32: result[0] = addr value.mat23f32[][0]
+    of Mat23F64: result[0] = addr value.mat23f64[][0]
+    of Mat32F32: result[0] = addr value.mat32f32[][0]
+    of Mat32F64: result[0] = addr value.mat32f64[][0]
+    of Mat3F32: result[0] = addr value.mat3f32[][0]
+    of Mat3F64: result[0] = addr value.mat3f64[][0]
+    of Mat34F32: result[0] = addr value.mat34f32[][0]
+    of Mat34F64: result[0] = addr value.mat34f64[][0]
+    of Mat43F32: result[0] = addr value.mat43f32[][0]
+    of Mat43F64: result[0] = addr value.mat43f64[][0]
+    of Mat4F32: result[0] = addr value.mat4f32[][0]
+    of Mat4F64: result[0] = addr value.mat4f64[][0]
     of Sampler2D: result[0] = nil
 
 func initData*(value: var DataList, len: uint32) =
   value.len = len
   case value.thetype
-    of Float32: value.float32.setLen(len)
-    of Float64: value.float64.setLen(len)
-    of Int8: value.int8.setLen(len)
-    of Int16: value.int16.setLen(len)
-    of Int32: value.int32.setLen(len)
-    of Int64: value.int64.setLen(len)
-    of UInt8: value.uint8.setLen(len)
-    of UInt16: value.uint16.setLen(len)
-    of UInt32: value.uint32.setLen(len)
-    of UInt64: value.uint64.setLen(len)
-    of Vec2I32: value.vec2i32.setLen(len)
-    of Vec2I64: value.vec2i64.setLen(len)
-    of Vec3I32: value.vec3i32.setLen(len)
-    of Vec3I64: value.vec3i64.setLen(len)
-    of Vec4I32: value.vec4i32.setLen(len)
-    of Vec4I64: value.vec4i64.setLen(len)
-    of Vec2U32: value.vec2u32.setLen(len)
-    of Vec2U64: value.vec2u64.setLen(len)
-    of Vec3U32: value.vec3u32.setLen(len)
-    of Vec3U64: value.vec3u64.setLen(len)
-    of Vec4U32: value.vec4u32.setLen(len)
-    of Vec4U64: value.vec4u64.setLen(len)
-    of Vec2F32: value.vec2f32.setLen(len)
-    of Vec2F64: value.vec2f64.setLen(len)
-    of Vec3F32: value.vec3f32.setLen(len)
-    of Vec3F64: value.vec3f64.setLen(len)
-    of Vec4F32: value.vec4f32.setLen(len)
-    of Vec4F64: value.vec4f64.setLen(len)
-    of Mat2F32: value.mat2f32.setLen(len)
-    of Mat2F64: value.mat2f64.setLen(len)
-    of Mat23F32: value.mat23f32.setLen(len)
-    of Mat23F64: value.mat23f64.setLen(len)
-    of Mat32F32: value.mat32f32.setLen(len)
-    of Mat32F64: value.mat32f64.setLen(len)
-    of Mat3F32: value.mat3f32.setLen(len)
-    of Mat3F64: value.mat3f64.setLen(len)
-    of Mat34F32: value.mat34f32.setLen(len)
-    of Mat34F64: value.mat34f64.setLen(len)
-    of Mat43F32: value.mat43f32.setLen(len)
-    of Mat43F64: value.mat43f64.setLen(len)
-    of Mat4F32: value.mat4f32.setLen(len)
-    of Mat4F64: value.mat4f64.setLen(len)
+    of Float32: value.float32[].setLen(len)
+    of Float64: value.float64[].setLen(len)
+    of Int8: value.int8[].setLen(len)
+    of Int16: value.int16[].setLen(len)
+    of Int32: value.int32[].setLen(len)
+    of Int64: value.int64[].setLen(len)
+    of UInt8: value.uint8[].setLen(len)
+    of UInt16: value.uint16[].setLen(len)
+    of UInt32: value.uint32[].setLen(len)
+    of UInt64: value.uint64[].setLen(len)
+    of Vec2I32: value.vec2i32[].setLen(len)
+    of Vec2I64: value.vec2i64[].setLen(len)
+    of Vec3I32: value.vec3i32[].setLen(len)
+    of Vec3I64: value.vec3i64[].setLen(len)
+    of Vec4I32: value.vec4i32[].setLen(len)
+    of Vec4I64: value.vec4i64[].setLen(len)
+    of Vec2U32: value.vec2u32[].setLen(len)
+    of Vec2U64: value.vec2u64[].setLen(len)
+    of Vec3U32: value.vec3u32[].setLen(len)
+    of Vec3U64: value.vec3u64[].setLen(len)
+    of Vec4U32: value.vec4u32[].setLen(len)
+    of Vec4U64: value.vec4u64[].setLen(len)
+    of Vec2F32: value.vec2f32[].setLen(len)
+    of Vec2F64: value.vec2f64[].setLen(len)
+    of Vec3F32: value.vec3f32[].setLen(len)
+    of Vec3F64: value.vec3f64[].setLen(len)
+    of Vec4F32: value.vec4f32[].setLen(len)
+    of Vec4F64: value.vec4f64[].setLen(len)
+    of Mat2F32: value.mat2f32[].setLen(len)
+    of Mat2F64: value.mat2f64[].setLen(len)
+    of Mat23F32: value.mat23f32[].setLen(len)
+    of Mat23F64: value.mat23f64[].setLen(len)
+    of Mat32F32: value.mat32f32[].setLen(len)
+    of Mat32F64: value.mat32f64[].setLen(len)
+    of Mat3F32: value.mat3f32[].setLen(len)
+    of Mat3F64: value.mat3f64[].setLen(len)
+    of Mat34F32: value.mat34f32[].setLen(len)
+    of Mat34F64: value.mat34f64[].setLen(len)
+    of Mat43F32: value.mat43f32[].setLen(len)
+    of Mat43F64: value.mat43f64[].setLen(len)
+    of Mat4F32: value.mat4f32[].setLen(len)
+    of Mat4F64: value.mat4f64[].setLen(len)
     of Sampler2D: discard
 
 func setValue*[T: GPUType|int|uint|float](value: var DataValue, data: T) =
@@ -596,206 +653,206 @@
 
 func setValues*[T: GPUType|int|uint|float](value: var DataList, data: seq[T]) =
   value.len = uint32(data.len)
-  when T is float32: value.float32 = data
-  elif T is float64: value.float64 = data
-  elif T is int8: value.int8 = data
-  elif T is int16: value.int16 = data
-  elif T is int32: value.int32 = data
-  elif T is int64: value.int64 = data
-  elif T is uint8: value.uint8 = data
-  elif T is uint16: value.uint16 = data
-  elif T is uint32: value.uint32 = data
-  elif T is uint64: value.uint64 = data
-  elif T is int and sizeof(int) == sizeof(int32): value.int32 = data
-  elif T is int and sizeof(int) == sizeof(int64): value.int64 = data
-  elif T is uint and sizeof(uint) == sizeof(uint32): value.uint32 = data
-  elif T is uint and sizeof(uint) == sizeof(uint64): value.uint64 = data
-  elif T is float and sizeof(float) == sizeof(float32): value.float32 = data
-  elif T is float and sizeof(float) == sizeof(float64): value.float64 = data
-  elif T is TVec2[int32]: value.vec2i32 = data
-  elif T is TVec2[int64]: value.vec2i64 = data
-  elif T is TVec3[int32]: value.vec3i32 = data
-  elif T is TVec3[int64]: value.vec3i64 = data
-  elif T is TVec4[int32]: value.vec4i32 = data
-  elif T is TVec4[int64]: value.vec4i64 = data
-  elif T is TVec2[uint32]: value.vec2u32 = data
-  elif T is TVec2[uint64]: value.vec2u64 = data
-  elif T is TVec3[uint32]: value.vec3u32 = data
-  elif T is TVec3[uint64]: value.vec3u64 = data
-  elif T is TVec4[uint32]: value.vec4u32 = data
-  elif T is TVec4[uint64]: value.vec4u64 = data
-  elif T is TVec2[float32]: value.vec2f32 = data
-  elif T is TVec2[float64]: value.vec2f64 = data
-  elif T is TVec3[float32]: value.vec3f32 = data
-  elif T is TVec3[float64]: value.vec3f64 = data
-  elif T is TVec4[float32]: value.vec4f32 = data
-  elif T is TVec4[float64]: value.vec4f64 = data
-  elif T is TMat2[float32]: value.mat2f32 = data
-  elif T is TMat2[float64]: value.mat2f64 = data
-  elif T is TMat23[float32]: value.mat23f32 = data
-  elif T is TMat23[float64]: value.mat23f64 = data
-  elif T is TMat32[float32]: value.mat32f32 = data
-  elif T is TMat32[float64]: value.mat32f64 = data
-  elif T is TMat3[float32]: value.mat3f32 = data
-  elif T is TMat3[float64]: value.mat3f64 = data
-  elif T is TMat34[float32]: value.mat34f32 = data
-  elif T is TMat34[float64]: value.mat34f64 = data
-  elif T is TMat43[float32]: value.mat43f32 = data
-  elif T is TMat43[float64]: value.mat43f64 = data
-  elif T is TMat4[float32]: value.mat4f32 = data
-  elif T is TMat4[float64]: value.mat4f64 = data
+  when T is float32: value.float32[] = data
+  elif T is float64: value.float64[] = data
+  elif T is int8: value.int8[] = data
+  elif T is int16: value.int16[] = data
+  elif T is int32: value.int32[] = data
+  elif T is int64: value.int64[] = data
+  elif T is uint8: value.uint8[] = data
+  elif T is uint16: value.uint16[] = data
+  elif T is uint32: value.uint32[] = data
+  elif T is uint64: value.uint64[] = data
+  elif T is int and sizeof(int) == sizeof(int32): value.int32[] = data
+  elif T is int and sizeof(int) == sizeof(int64): value.int64[] = data
+  elif T is uint and sizeof(uint) == sizeof(uint32): value.uint32[] = data
+  elif T is uint and sizeof(uint) == sizeof(uint64): value.uint64[] = data
+  elif T is float and sizeof(float) == sizeof(float32): value.float32[] = data
+  elif T is float and sizeof(float) == sizeof(float64): value.float64[] = data
+  elif T is TVec2[int32]: value.vec2i32[] = data
+  elif T is TVec2[int64]: value.vec2i64[] = data
+  elif T is TVec3[int32]: value.vec3i32[] = data
+  elif T is TVec3[int64]: value.vec3i64[] = data
+  elif T is TVec4[int32]: value.vec4i32[] = data
+  elif T is TVec4[int64]: value.vec4i64[] = data
+  elif T is TVec2[uint32]: value.vec2u32[] = data
+  elif T is TVec2[uint64]: value.vec2u64[] = data
+  elif T is TVec3[uint32]: value.vec3u32[] = data
+  elif T is TVec3[uint64]: value.vec3u64[] = data
+  elif T is TVec4[uint32]: value.vec4u32[] = data
+  elif T is TVec4[uint64]: value.vec4u64[] = data
+  elif T is TVec2[float32]: value.vec2f32[] = data
+  elif T is TVec2[float64]: value.vec2f64[] = data
+  elif T is TVec3[float32]: value.vec3f32[] = data
+  elif T is TVec3[float64]: value.vec3f64[] = data
+  elif T is TVec4[float32]: value.vec4f32[] = data
+  elif T is TVec4[float64]: value.vec4f64[] = data
+  elif T is TMat2[float32]: value.mat2f32[] = data
+  elif T is TMat2[float64]: value.mat2f64[] = data
+  elif T is TMat23[float32]: value.mat23f32[] = data
+  elif T is TMat23[float64]: value.mat23f64[] = data
+  elif T is TMat32[float32]: value.mat32f32[] = data
+  elif T is TMat32[float64]: value.mat32f64[] = data
+  elif T is TMat3[float32]: value.mat3f32[] = data
+  elif T is TMat3[float64]: value.mat3f64[] = data
+  elif T is TMat34[float32]: value.mat34f32[] = data
+  elif T is TMat34[float64]: value.mat34f64[] = data
+  elif T is TMat43[float32]: value.mat43f32[] = data
+  elif T is TMat43[float64]: value.mat43f64[] = data
+  elif T is TMat4[float32]: value.mat4f32[] = data
+  elif T is TMat4[float64]: value.mat4f64[] = data
   else: {. error: "Virtual datatype has no values" .}
 
 func appendValues*[T: GPUType|int|uint|float](value: var DataList, data: seq[T]) =
   value.len += data.len
-  when T is float32: value.float32.add data
-  elif T is float64: value.float64.add data
-  elif T is int8: value.int8.add data
-  elif T is int16: value.int16.add data
-  elif T is int32: value.int32.add data
-  elif T is int64: value.int64.add data
-  elif T is uint8: value.uint8.add data
-  elif T is uint16: value.uint16.add data
-  elif T is uint32: value.uint32.add data
-  elif T is uint64: value.uint64.add data
-  elif T is int and sizeof(int) == sizeof(int32): value.int32.add data
-  elif T is int and sizeof(int) == sizeof(int64): value.int64.add data
-  elif T is uint and sizeof(uint) == sizeof(uint32): value.uint32.add data
-  elif T is uint and sizeof(uint) == sizeof(uint64): value.uint64.add data
-  elif T is float and sizeof(float) == sizeof(float32): value.float32.add data
-  elif T is float and sizeof(float) == sizeof(float64): value.float64.add data
-  elif T is TVec2[int32]: value.vec2i32.add data
-  elif T is TVec2[int64]: value.vec2i64.add data
-  elif T is TVec3[int32]: value.vec3i32.add data
-  elif T is TVec3[int64]: value.vec3i64.add data
-  elif T is TVec4[int32]: value.vec4i32.add data
-  elif T is TVec4[int64]: value.vec4i64.add data
-  elif T is TVec2[uint32]: value.vec2u32.add data
-  elif T is TVec2[uint64]: value.vec2u64.add data
-  elif T is TVec3[uint32]: value.vec3u32.add data
-  elif T is TVec3[uint64]: value.vec3u64.add data
-  elif T is TVec4[uint32]: value.vec4u32.add data
-  elif T is TVec4[uint64]: value.vec4u64.add data
-  elif T is TVec2[float32]: value.vec2f32.add data
-  elif T is TVec2[float64]: value.vec2f64.add data
-  elif T is TVec3[float32]: value.vec3f32.add data
-  elif T is TVec3[float64]: value.vec3f64.add data
-  elif T is TVec4[float32]: value.vec4f32.add data
-  elif T is TVec4[float64]: value.vec4f64.add data
-  elif T is TMat2[float32]: value.mat2f32.add data
-  elif T is TMat2[float64]: value.mat2f64.add data
-  elif T is TMat23[float32]: value.mat23f32.add data
-  elif T is TMat23[float64]: value.mat23f64.add data
-  elif T is TMat32[float32]: value.mat32f32.add data
-  elif T is TMat32[float64]: value.mat32f64.add data
-  elif T is TMat3[float32]: value.mat3f32.add data
-  elif T is TMat3[float64]: value.mat3f64.add data
-  elif T is TMat34[float32]: value.mat34f32.add data
-  elif T is TMat34[float64]: value.mat34f64.add data
-  elif T is TMat43[float32]: value.mat43f32.add data
-  elif T is TMat43[float64]: value.mat43f64.add data
-  elif T is TMat4[float32]: value.mat4f32.add data
-  elif T is TMat4[float64]: value.mat4f64.add data
+  when T is float32: value.float32[].add data
+  elif T is float64: value.float64[].add data
+  elif T is int8: value.int8[].add data
+  elif T is int16: value.int16[].add data
+  elif T is int32: value.int32[].add data
+  elif T is int64: value.int64[].add data
+  elif T is uint8: value.uint8[].add data
+  elif T is uint16: value.uint16[].add data
+  elif T is uint32: value.uint32[].add data
+  elif T is uint64: value.uint64[].add data
+  elif T is int and sizeof(int) == sizeof(int32): value.int32[].add data
+  elif T is int and sizeof(int) == sizeof(int64): value.int64[].add data
+  elif T is uint and sizeof(uint) == sizeof(uint32): value.uint32[].add data
+  elif T is uint and sizeof(uint) == sizeof(uint64): value.uint64[].add data
+  elif T is float and sizeof(float) == sizeof(float32): value.float32[].add data
+  elif T is float and sizeof(float) == sizeof(float64): value.float64[].add data
+  elif T is TVec2[int32]: value.vec2i32[].add data
+  elif T is TVec2[int64]: value.vec2i64[].add data
+  elif T is TVec3[int32]: value.vec3i32[].add data
+  elif T is TVec3[int64]: value.vec3i64[].add data
+  elif T is TVec4[int32]: value.vec4i32[].add data
+  elif T is TVec4[int64]: value.vec4i64[].add data
+  elif T is TVec2[uint32]: value.vec2u32[].add data
+  elif T is TVec2[uint64]: value.vec2u64[].add data
+  elif T is TVec3[uint32]: value.vec3u32[].add data
+  elif T is TVec3[uint64]: value.vec3u64[].add data
+  elif T is TVec4[uint32]: value.vec4u32[].add data
+  elif T is TVec4[uint64]: value.vec4u64[].add data
+  elif T is TVec2[float32]: value.vec2f32[].add data
+  elif T is TVec2[float64]: value.vec2f64[].add data
+  elif T is TVec3[float32]: value.vec3f32[].add data
+  elif T is TVec3[float64]: value.vec3f64[].add data
+  elif T is TVec4[float32]: value.vec4f32[].add data
+  elif T is TVec4[float64]: value.vec4f64[].add data
+  elif T is TMat2[float32]: value.mat2f32[].add data
+  elif T is TMat2[float64]: value.mat2f64[].add data
+  elif T is TMat23[float32]: value.mat23f32[].add data
+  elif T is TMat23[float64]: value.mat23f64[].add data
+  elif T is TMat32[float32]: value.mat32f32[].add data
+  elif T is TMat32[float64]: value.mat32f64[].add data
+  elif T is TMat3[float32]: value.mat3f32[].add data
+  elif T is TMat3[float64]: value.mat3f64[].add data
+  elif T is TMat34[float32]: value.mat34f32[].add data
+  elif T is TMat34[float64]: value.mat34f64[].add data
+  elif T is TMat43[float32]: value.mat43f32[].add data
+  elif T is TMat43[float64]: value.mat43f64[].add data
+  elif T is TMat4[float32]: value.mat4f32[].add data
+  elif T is TMat4[float64]: value.mat4f64[].add data
   else: {. error: "Virtual datatype has no values" .}
 
 func appendValues*(value: var DataList, data: DataList) =
   assert value.thetype == data.thetype
   value.len += data.len
   case value.thetype:
-  of Float32: value.float32.add data.float32
-  of Float64: value.float64.add data.float64
-  of Int8: value.int8.add data.int8
-  of Int16: value.int16.add data.int16
-  of Int32: value.int32.add data.int32
-  of Int64: value.int64.add data.int64
-  of UInt8: value.uint8.add data.uint8
-  of UInt16: value.uint16.add data.uint16
-  of UInt32: value.uint32.add data.uint32
-  of UInt64: value.uint64.add data.uint64
-  of Vec2I32: value.vec2i32.add data.vec2i32
-  of Vec2I64: value.vec2i64.add data.vec2i64
-  of Vec3I32: value.vec3i32.add data.vec3i32
-  of Vec3I64: value.vec3i64.add data.vec3i64
-  of Vec4I32: value.vec4i32.add data.vec4i32
-  of Vec4I64: value.vec4i64.add data.vec4i64
-  of Vec2U32: value.vec2u32.add data.vec2u32
-  of Vec2U64: value.vec2u64.add data.vec2u64
-  of Vec3U32: value.vec3u32.add data.vec3u32
-  of Vec3U64: value.vec3u64.add data.vec3u64
-  of Vec4U32: value.vec4u32.add data.vec4u32
-  of Vec4U64: value.vec4u64.add data.vec4u64
-  of Vec2F32: value.vec2f32.add data.vec2f32
-  of Vec2F64: value.vec2f64.add data.vec2f64
-  of Vec3F32: value.vec3f32.add data.vec3f32
-  of Vec3F64: value.vec3f64.add data.vec3f64
-  of Vec4F32: value.vec4f32.add data.vec4f32
-  of Vec4F64: value.vec4f64.add data.vec4f64
-  of Mat2F32: value.mat2f32.add data.mat2f32
-  of Mat2F64: value.mat2f64.add data.mat2f64
-  of Mat23F32: value.mat23f32.add data.mat23f32
-  of Mat23F64: value.mat23f64.add data.mat23f64
-  of Mat32F32: value.mat32f32.add data.mat32f32
-  of Mat32F64: value.mat32f64.add data.mat32f64
-  of Mat3F32: value.mat3f32.add data.mat3f32
-  of Mat3F64: value.mat3f64.add data.mat3f64
-  of Mat34F32: value.mat34f32.add data.mat34f32
-  of Mat34F64: value.mat34f64.add data.mat34f64
-  of Mat43F32: value.mat43f32.add data.mat43f32
-  of Mat43F64: value.mat43f64.add data.mat43f64
-  of Mat4F32: value.mat4f32.add data.mat4f32
-  of Mat4F64: value.mat4f64.add data.mat4f64
+  of Float32: value.float32[].add data.float32[]
+  of Float64: value.float64[].add data.float64[]
+  of Int8: value.int8[].add data.int8[]
+  of Int16: value.int16[].add data.int16[]
+  of Int32: value.int32[].add data.int32[]
+  of Int64: value.int64[].add data.int64[]
+  of UInt8: value.uint8[].add data.uint8[]
+  of UInt16: value.uint16[].add data.uint16[]
+  of UInt32: value.uint32[].add data.uint32[]
+  of UInt64: value.uint64[].add data.uint64[]
+  of Vec2I32: value.vec2i32[].add data.vec2i32[]
+  of Vec2I64: value.vec2i64[].add data.vec2i64[]
+  of Vec3I32: value.vec3i32[].add data.vec3i32[]
+  of Vec3I64: value.vec3i64[].add data.vec3i64[]
+  of Vec4I32: value.vec4i32[].add data.vec4i32[]
+  of Vec4I64: value.vec4i64[].add data.vec4i64[]
+  of Vec2U32: value.vec2u32[].add data.vec2u32[]
+  of Vec2U64: value.vec2u64[].add data.vec2u64[]
+  of Vec3U32: value.vec3u32[].add data.vec3u32[]
+  of Vec3U64: value.vec3u64[].add data.vec3u64[]
+  of Vec4U32: value.vec4u32[].add data.vec4u32[]
+  of Vec4U64: value.vec4u64[].add data.vec4u64[]
+  of Vec2F32: value.vec2f32[].add data.vec2f32[]
+  of Vec2F64: value.vec2f64[].add data.vec2f64[]
+  of Vec3F32: value.vec3f32[].add data.vec3f32[]
+  of Vec3F64: value.vec3f64[].add data.vec3f64[]
+  of Vec4F32: value.vec4f32[].add data.vec4f32[]
+  of Vec4F64: value.vec4f64[].add data.vec4f64[]
+  of Mat2F32: value.mat2f32[].add data.mat2f32[]
+  of Mat2F64: value.mat2f64[].add data.mat2f64[]
+  of Mat23F32: value.mat23f32[].add data.mat23f32[]
+  of Mat23F64: value.mat23f64[].add data.mat23f64[]
+  of Mat32F32: value.mat32f32[].add data.mat32f32[]
+  of Mat32F64: value.mat32f64[].add data.mat32f64[]
+  of Mat3F32: value.mat3f32[].add data.mat3f32[]
+  of Mat3F64: value.mat3f64[].add data.mat3f64[]
+  of Mat34F32: value.mat34f32[].add data.mat34f32[]
+  of Mat34F64: value.mat34f64[].add data.mat34f64[]
+  of Mat43F32: value.mat43f32[].add data.mat43f32[]
+  of Mat43F64: value.mat43f64[].add data.mat43f64[]
+  of Mat4F32: value.mat4f32[].add data.mat4f32[]
+  of Mat4F64: value.mat4f64[].add data.mat4f64[]
   else: raise newException(Exception, &"Unsupported data type for GPU data:" )
 
 func setValue*[T: GPUType|int|uint|float](value: var DataList, i: uint32, data: T) =
   assert i < value.len
-  when T is float32: value.float32[i] = data
-  elif T is float64: value.float64[i] = data
-  elif T is int8: value.int8[i] = data
-  elif T is int16: value.int16[i] = data
-  elif T is int32: value.int32[i] = data
-  elif T is int64: value.int64[i] = data
-  elif T is uint8: value.uint8[i] = data
-  elif T is uint16: value.uint16[i] = data
-  elif T is uint32: value.uint32[i] = data
-  elif T is uint64: value.uint64[i] = data
-  elif T is int and sizeof(int) == sizeof(int32): value.int32[i] = data
-  elif T is int and sizeof(int) == sizeof(int64): value.int64[i] = data
-  elif T is uint and sizeof(uint) == sizeof(uint32): value.uint32[i] = data
-  elif T is uint and sizeof(uint) == sizeof(uint64): value.uint64[i] = data
-  elif T is float and sizeof(float) == sizeof(float32): value.float32[i] = data
-  elif T is float and sizeof(float) == sizeof(float64): value.float64[i] = data
-  elif T is TVec2[int32]: value.vec2i32[i] = data
-  elif T is TVec2[int64]: value.vec2i64[i] = data
-  elif T is TVec3[int32]: value.vec3i32[i] = data
-  elif T is TVec3[int64]: value.vec3i64[i] = data
-  elif T is TVec4[int32]: value.vec4i32[i] = data
-  elif T is TVec4[int64]: value.vec4i64[i] = data
-  elif T is TVec2[uint32]: value.vec2u32[i] = data
-  elif T is TVec2[uint64]: value.vec2u64[i] = data
-  elif T is TVec3[uint32]: value.vec3u32[i] = data
-  elif T is TVec3[uint64]: value.vec3u64[i] = data
-  elif T is TVec4[uint32]: value.vec4u32[i] = data
-  elif T is TVec4[uint64]: value.vec4u64[i] = data
-  elif T is TVec2[float32]: value.vec2f32[i] = data
-  elif T is TVec2[float64]: value.vec2f64[i] = data
-  elif T is TVec3[float32]: value.vec3f32[i] = data
-  elif T is TVec3[float64]: value.vec3f64[i] = data
-  elif T is TVec4[float32]: value.vec4f32[i] = data
-  elif T is TVec4[float64]: value.vec4f64[i] = data
-  elif T is TMat2[float32]: value.mat2f32[i] = data
-  elif T is TMat2[float64]: value.mat2f64[i] = data
-  elif T is TMat23[float32]: value.mat23f32[i] = data
-  elif T is TMat23[float64]: value.mat23f64[i] = data
-  elif T is TMat32[float32]: value.mat32f32[i] = data
-  elif T is TMat32[float64]: value.mat32f64[i] = data
-  elif T is TMat3[float32]: value.mat3f32[i] = data
-  elif T is TMat3[float64]: value.mat3f64[i] = data
-  elif T is TMat34[float32]: value.mat34f32[i] = data
-  elif T is TMat34[float64]: value.mat34f64[i] = data
-  elif T is TMat43[float32]: value.mat43f32[i] = data
-  elif T is TMat43[float64]: value.mat43f64[i] = data
-  elif T is TMat4[float32]: value.mat4f32[i] = data
-  elif T is TMat4[float64]: value.mat4f64[i] = data
+  when T is float32: value.float32[][i] = data
+  elif T is float64: value.float64[][i] = data
+  elif T is int8: value.int8[][i] = data
+  elif T is int16: value.int16[][i] = data
+  elif T is int32: value.int32[][i] = data
+  elif T is int64: value.int64[][i] = data
+  elif T is uint8: value.uint8[][i] = data
+  elif T is uint16: value.uint16[][i] = data
+  elif T is uint32: value.uint32[][i] = data
+  elif T is uint64: value.uint64[][i] = data
+  elif T is int and sizeof(int) == sizeof(int32): value.int32[][i] = data
+  elif T is int and sizeof(int) == sizeof(int64): value.int64[][i] = data
+  elif T is uint and sizeof(uint) == sizeof(uint32): value.uint32[][i] = data
+  elif T is uint and sizeof(uint) == sizeof(uint64): value.uint64[][i] = data
+  elif T is float and sizeof(float) == sizeof(float32): value.float32[][i] = data
+  elif T is float and sizeof(float) == sizeof(float64): value.float64[][i] = data
+  elif T is TVec2[int32]: value.vec2i32[][i] = data
+  elif T is TVec2[int64]: value.vec2i64[][i] = data
+  elif T is TVec3[int32]: value.vec3i32[][i] = data
+  elif T is TVec3[int64]: value.vec3i64[][i] = data
+  elif T is TVec4[int32]: value.vec4i32[][i] = data
+  elif T is TVec4[int64]: value.vec4i64[][i] = data
+  elif T is TVec2[uint32]: value.vec2u32[][i] = data
+  elif T is TVec2[uint64]: value.vec2u64[][i] = data
+  elif T is TVec3[uint32]: value.vec3u32[][i] = data
+  elif T is TVec3[uint64]: value.vec3u64[][i] = data
+  elif T is TVec4[uint32]: value.vec4u32[][i] = data
+  elif T is TVec4[uint64]: value.vec4u64[][i] = data
+  elif T is TVec2[float32]: value.vec2f32[][i] = data
+  elif T is TVec2[float64]: value.vec2f64[][i] = data
+  elif T is TVec3[float32]: value.vec3f32[][i] = data
+  elif T is TVec3[float64]: value.vec3f64[][i] = data
+  elif T is TVec4[float32]: value.vec4f32[][i] = data
+  elif T is TVec4[float64]: value.vec4f64[][i] = data
+  elif T is TMat2[float32]: value.mat2f32[][i] = data
+  elif T is TMat2[float64]: value.mat2f64[][i] = data
+  elif T is TMat23[float32]: value.mat23f32[][i] = data
+  elif T is TMat23[float64]: value.mat23f64[][i] = data
+  elif T is TMat32[float32]: value.mat32f32[][i] = data
+  elif T is TMat32[float64]: value.mat32f64[][i] = data
+  elif T is TMat3[float32]: value.mat3f32[][i] = data
+  elif T is TMat3[float64]: value.mat3f64[][i] = data
+  elif T is TMat34[float32]: value.mat34f32[][i] = data
+  elif T is TMat34[float64]: value.mat34f64[][i] = data
+  elif T is TMat43[float32]: value.mat43f32[][i] = data
+  elif T is TMat43[float64]: value.mat43f64[][i] = data
+  elif T is TMat4[float32]: value.mat4f32[][i] = data
+  elif T is TMat4[float64]: value.mat4f64[][i] = data
   else: {. error: "Virtual datatype has no values" .}
 
 const TYPEMAP = {
--- a/src/semicongine/mesh.nim	Mon May 15 00:36:25 2023 +0700
+++ b/src/semicongine/mesh.nim	Mon May 15 14:25:04 2023 +0700
@@ -139,13 +139,13 @@
 func getRawData*(mesh: Mesh, attribute: string): (pointer, uint32) =
   mesh.data[attribute].getRawData()
 
-proc getMeshData*[T: GPUType|int|uint|float](mesh: Mesh, attribute: string): seq[T] =
+proc getMeshData*[T: GPUType|int|uint|float](mesh: Mesh, attribute: string): ref seq[T] =
   assert attribute in mesh.data
   getValues[T](mesh.data[attribute])
 
 proc initData*(mesh: var Mesh, attribute: ShaderAttribute) =
   assert not (attribute.name in mesh.data)
-  mesh.data[attribute.name] = DataList(thetype: attribute.thetype)
+  mesh.data[attribute.name] = newDataList(thetype=attribute.thetype)
   if attribute.perInstance:
     mesh.data[attribute.name].initData(mesh.instanceCount)
   else:
@@ -153,8 +153,7 @@
 
 proc setMeshData*[T: GPUType|int|uint|float](mesh: var Mesh, attribute: string, data: seq[T]) =
   assert not (attribute in mesh.data)
-  mesh.data[attribute] = DataList(thetype: getDataType[T]())
-  setValues(mesh.data[attribute], data)
+  mesh.data[attribute] = newDataList[T](data)
 
 proc setMeshData*(mesh: var Mesh, attribute: string, data: DataList) =
   assert not (attribute in mesh.data)
@@ -213,6 +212,16 @@
 proc clearDataChanged*(mesh: var Mesh) =
   mesh.changedAttributes = @[]
 
+proc transform*[T: GPUType](mesh: var Mesh, attribute: string, transform: Mat4) =
+  assert attribute in mesh.data
+  echo "=========", getMeshData[Vec3f](mesh, attribute)[][0 .. 3]
+  for v in getValues[T](mesh.data[attribute])[].mitems:
+    when T is Vec3f:
+      v = (transform * newVec4f(v.x, v.y, v.z)).xyz
+    else:
+      v = transform * v
+  echo "=========", getMeshData[Vec3f](mesh, attribute)[][0 .. 3]
+
 func rect*(width=1'f32, height=1'f32, color="ffffffff"): Mesh =
   result = new Mesh
   result.instanceCount = 1
--- a/src/semicongine/resources/mesh.nim	Mon May 15 00:36:25 2023 +0700
+++ b/src/semicongine/resources/mesh.nim	Mon May 15 14:25:04 2023 +0700
@@ -37,7 +37,6 @@
 func getGPUType(accessor: JsonNode): DataType =
   # TODO: no full support for all datatypes that glTF may provide
   # semicongine/core/gpu_data should maybe generated with macros to allow for all combinations
-  debugecho accessor.pretty()
   let componentType = ACCESSOR_TYPE_MAP[accessor["componentType"].getInt()]
   let theType = accessor["type"].getStr()
   case theType
@@ -73,7 +72,7 @@
 
 
 proc getAccessorData(root: JsonNode, accessor: JsonNode, mainBuffer: var seq[uint8]): DataList =
-  result.thetype = accessor.getGPUType()
+  result = newDataList(thetype=accessor.getGPUType())
   result.initData(uint32(accessor["count"].getInt()))
 
   let bufferView = root["bufferViews"][accessor["bufferView"].getInt()]
@@ -104,6 +103,8 @@
   for attribute, accessor in primitiveNode["attributes"].pairs:
     let data = root.getAccessorData(root["accessors"][accessor.getInt()], mainBuffer)
     mesh.appendMeshData(attribute, data)
+    if attribute == "POSITION":
+      transform[Vec3f](mesh, "POSITION", scale3d(1'f32, -1'f32, 1'f32))
 
   if primitiveNode.hasKey("indices"):
     assert mesh.indexType != None
@@ -111,13 +112,13 @@
     var tri: seq[uint32]
     case data.thetype
       of UInt16:
-        for entry in getValues[uint16](data):
+        for entry in getValues[uint16](data)[]:
           tri.add uint32(entry)
           if tri.len == 3:
             mesh.appendIndicesData(tri[0], tri[1], tri[2])
             tri.setLen(0)
       of UInt32:
-        for entry in getValues[uint32](data):
+        for entry in getValues[uint32](data)[]:
           tri.add uint32(entry)
           if tri.len == 3:
             mesh.appendIndicesData(tri[0], tri[1], tri[2])
@@ -149,7 +150,7 @@
 
   # prepare mesh attributes
   for attribute, accessor in meshNode["primitives"][0]["attributes"].pairs:
-    result.setMeshData(attribute, DataList(thetype: root["accessors"][accessor.getInt()].getGPUType()))
+    result.setMeshData(attribute, newDataList(thetype=root["accessors"][accessor.getInt()].getGPUType()))
 
   # add all mesh data
   for primitive in meshNode["primitives"]:
@@ -235,3 +236,5 @@
 
   for scene in data.structuredContent["scenes"]:
     result.add data.structuredContent.loadScene(scene, data.binaryBufferData)
+
+  debugecho data.structuredContent.pretty()