README.md

MSFT_texture_dds

Contributors

• Saurabh Bhatia, Microsoft
• Gary Hsu, Microsoft
• Marc Appelsmeier, Microsoft
• Dag Frommhold, Microsoft
• John Copic, Microsoft

Status

Draft

Dependencies

Written against the glTF 2.0 spec.

Overview

This extension adds the ability to specify textures using the DirectDraw Surface file format (DDS). An implementation of this extension can use the textures provided in the DDS files as an alternative to the PNG or JPG textures available in glTF 2.0.

The extension is added to the textures node and specifies a source property that points to the index of the images node which in turn points to the DDS texture file. A client that does not understand this extension can ignore the DDS file and continue to rely on the PNG or JPG textures specified.

"textures": [
    {
        "source": 0,
        "extensions": {
            "MSFT_texture_dds": {
                "source": 1
            }
        }
    }
],
"images": [
    {
        "uri": "defaultTexture.png"
    },
    {
        "uri": "DDSTexture.dds"
    }
]

When used in the glTF Binary (.glb) format the images node that points to the DDS file uses the mimeType value of image/vnd-ms.dds.

"textures": [
    {
        "source": 0,
        "extensions": {
            "MSFT_texture_dds": {
                "source": 1
            }
        }
    }
],
"images": [
    {
        "mimeType": "image/png",
        "bufferView": 1
    },
    {
        "mimeType": "image/vnd-ms.dds",
        "bufferView": 2
    }
]

glTF Schema Updates

• JSON schema: glTF.MSFT_texture_dds.schema.json

Known Implementations

This extension is used by Windows Mixed Reality Home and 3D Launchers for Windows Mixed Reality to improve performance by including DDS textures. glTF-Toolkit can be used to generate files that use this extension.