diff --git a/Engine/src/Engine/Graphics/VertexLayout.h b/Engine/src/Engine/Graphics/VertexLayout.h
index 5b13f24..ce874d5 100644
--- a/Engine/src/Engine/Graphics/VertexLayout.h
+++ b/Engine/src/Engine/Graphics/VertexLayout.h
@@ -11,10 +11,11 @@ namespace Light {
 
 	enum class VertexElementType
 	{
-		Int1   , Int2   , Int3   , Int4,
-		UInt1  , UInt2  , UInt3  , UInt4,
-		Float1 , Float2 , Float3 , Float4,
-		Double1, Double2, Double3, Double4
+		Byte1  , Byte2           , Byte4  ,
+		UByte1 , UByte2          , UByte4 ,
+		Int1   , Int2   , Int3   , Int4   ,
+		UInt1  , UInt2  , UInt3  , UInt4  ,
+		Float1 , Float2 , Float3 , Float4 ,
 	};
 
 	class VertexLayout
diff --git a/Engine/src/Platform/GraphicsAPI/DirectX/dxVertexLayout.cpp b/Engine/src/Platform/GraphicsAPI/DirectX/dxVertexLayout.cpp
index 63dc4ed..2c5db2a 100644
--- a/Engine/src/Platform/GraphicsAPI/DirectX/dxVertexLayout.cpp
+++ b/Engine/src/Platform/GraphicsAPI/DirectX/dxVertexLayout.cpp
@@ -53,32 +53,37 @@ namespace Light {
 	{
 		switch (type)
 		{
-		// #todo: add char
-		// int
+		/* byte */
+		case Light::VertexElementType::Byte1: return DXGI_FORMAT_R8_SINT;
+		case Light::VertexElementType::Byte2: return DXGI_FORMAT_R8G8_SINT;
+		case Light::VertexElementType::Byte4: return DXGI_FORMAT_R8_SINT;
+
+		/* ubyte */
+		case Light::VertexElementType::UByte1: return DXGI_FORMAT_R8_UINT;
+		case Light::VertexElementType::UByte2: return DXGI_FORMAT_R8G8_UINT;
+		case Light::VertexElementType::UByte4: return DXGI_FORMAT_R8G8B8A8_UINT;
+
+		/* int */
 		case Light::VertexElementType::Int1: return DXGI_FORMAT_R32_SINT;
 		case Light::VertexElementType::Int2: return DXGI_FORMAT_R32G32_SINT;
 		case Light::VertexElementType::Int3: return DXGI_FORMAT_R32G32B32_SINT;
 		case Light::VertexElementType::Int4: return DXGI_FORMAT_R32G32B32A32_SINT;
 
-		// uint
+		/* uint */
 		case Light::VertexElementType::UInt1: return DXGI_FORMAT_R32_UINT;
 		case Light::VertexElementType::UInt2: return DXGI_FORMAT_R32G32_UINT;
 		case Light::VertexElementType::UInt3: return DXGI_FORMAT_R32G32B32_UINT;
 		case Light::VertexElementType::UInt4: return DXGI_FORMAT_R32G32B32A32_UINT;
 
-		// float
+		/* float */
 		case Light::VertexElementType::Float1: return DXGI_FORMAT_R32_FLOAT;
 		case Light::VertexElementType::Float2: return DXGI_FORMAT_R32G32_FLOAT;
 		case Light::VertexElementType::Float3: return DXGI_FORMAT_R32G32B32_FLOAT;
 		case Light::VertexElementType::Float4: return DXGI_FORMAT_R32G32B32A32_FLOAT;
 
-		// #todo:
-		case Light::VertexElementType::Double1:
-		case Light::VertexElementType::Double2:
-		case Light::VertexElementType::Double3:
-		case Light::VertexElementType::Double4:
-
-		default: LT_ENGINE_ASSERT(false, "dxVertexLayout::GetDxgiFormat: invalid 'VertexElementType'");
+		default: 
+			LT_ENGINE_ASSERT(false, "dxVertexLayout::GetDxgiFormat: invalid 'VertexElementType'");
+			return DXGI_FORMAT_UNKNOWN;
 		}
 	}
 
diff --git a/Engine/src/Platform/GraphicsAPI/OpenGL/glVertexLayout.cpp b/Engine/src/Platform/GraphicsAPI/OpenGL/glVertexLayout.cpp
index 6277904..eb71d1b 100644
--- a/Engine/src/Platform/GraphicsAPI/OpenGL/glVertexLayout.cpp
+++ b/Engine/src/Platform/GraphicsAPI/OpenGL/glVertexLayout.cpp
@@ -60,30 +60,33 @@ namespace Light {
 	{
 		switch (type)
 		{
-		// #todo: add char
-		// int
-		case VertexElementType::Int1: return { GL_INT, 1u, sizeof(int), offset };
-		case VertexElementType::Int2: return { GL_INT, 2u, sizeof(int), offset };
-		case VertexElementType::Int3: return { GL_INT, 3u, sizeof(int), offset };
-		case VertexElementType::Int4: return { GL_INT, 4u, sizeof(int), offset };
+		/* byte */
+		case Light::VertexElementType::Byte1: return { GL_BYTE, 1u, sizeof(GLbyte), offset };
+		case Light::VertexElementType::Byte2: return { GL_BYTE, 1u, sizeof(GLbyte), offset };
+		case Light::VertexElementType::Byte4: return { GL_BYTE, 1u, sizeof(GLbyte), offset };
 
-		// uint
-		case VertexElementType::UInt1: return { GL_UNSIGNED_INT, 1u, sizeof(unsigned int), offset };
-		case VertexElementType::UInt2: return { GL_UNSIGNED_INT, 2u, sizeof(unsigned int), offset };
-		case VertexElementType::UInt3: return { GL_UNSIGNED_INT, 3u, sizeof(unsigned int), offset };
-		case VertexElementType::UInt4: return { GL_UNSIGNED_INT, 4u, sizeof(unsigned int), offset };
+		/* ubyte */
+		case Light::VertexElementType::UByte1: return { GL_UNSIGNED_BYTE, 1u, sizeof(GLubyte), offset };
+		case Light::VertexElementType::UByte2: return { GL_UNSIGNED_BYTE, 2u, sizeof(GLubyte), offset };
+		case Light::VertexElementType::UByte4: return { GL_UNSIGNED_BYTE, 4u, sizeof(GLubyte), offset };
 
-		// float
-		case VertexElementType::Float1: return { GL_FLOAT, 1u, sizeof(float), offset };
-		case VertexElementType::Float2: return { GL_FLOAT, 2u, sizeof(float), offset };
-		case VertexElementType::Float3: return { GL_FLOAT, 3u, sizeof(float), offset };
-		case VertexElementType::Float4: return { GL_FLOAT, 4u, sizeof(float), offset };
+		/* int */
+		case VertexElementType::Int1: return { GL_INT, 1u, sizeof(GLint), offset };
+		case VertexElementType::Int2: return { GL_INT, 2u, sizeof(GLint), offset };
+		case VertexElementType::Int3: return { GL_INT, 3u, sizeof(GLint), offset };
+		case VertexElementType::Int4: return { GL_INT, 4u, sizeof(GLint), offset };
 
-		// double
-		case VertexElementType::Double1: return { GL_DOUBLE, 1, sizeof(float), offset };
-		case VertexElementType::Double2: return { GL_DOUBLE, 2, sizeof(float), offset };
-		case VertexElementType::Double3: return { GL_DOUBLE, 3, sizeof(float), offset };
-		case VertexElementType::Double4: return { GL_DOUBLE, 4, sizeof(float), offset };
+		/* uint */
+		case VertexElementType::UInt1: return { GL_UNSIGNED_INT, 1u, sizeof(GLuint), offset };
+		case VertexElementType::UInt2: return { GL_UNSIGNED_INT, 2u, sizeof(GLuint), offset };
+		case VertexElementType::UInt3: return { GL_UNSIGNED_INT, 3u, sizeof(GLuint), offset };
+		case VertexElementType::UInt4: return { GL_UNSIGNED_INT, 4u, sizeof(GLuint), offset };
+
+		/* float */
+		case VertexElementType::Float1: return { GL_FLOAT, 1u, sizeof(GLfloat), offset };
+		case VertexElementType::Float2: return { GL_FLOAT, 2u, sizeof(GLfloat), offset };
+		case VertexElementType::Float3: return { GL_FLOAT, 3u, sizeof(GLfloat), offset };
+		case VertexElementType::Float4: return { GL_FLOAT, 4u, sizeof(GLfloat), offset };
 
 		default:
 			LT_ENGINE_ASSERT(false, "glVertexLayout::GetElementDesc: invalid 'VertexElementType'");