Example of a DOTS Instancing shader that accesses per-instance data in URP

In this example:

• The metadata value for Color is 0x80001000.
• The instance index is 5.
• Data for instance 0 starts at address 0x1000.
• Data for instance 5 is at address 0x1000 + 5 * sizeof(float4) = 0x1050

Because the most significant bit is already set, the accessor macros don’t load defaults. This means that c0, c1, and c2 will all have the same value, loaded from unity_DOTSInstanceData address 0x1050.

void ExamplePerInstance()
{
    // rawMetadataValue will contain 0x80001000
    uint rawMetadataValue = UNITY_DOTS_INSTANCED_METADATA_NAME(float4, Color);

    float4 c0 = UNITY_ACCESS_DOTS_INSTANCED_PROP(float4, Color);
    float4 c1 = UNITY_ACCESS_DOTS_INSTANCED_PROP_WITH_DEFAULT(float4, Color);
    float4 c2 = UNITY_ACCESS_DOTS_INSTANCED_PROP_WITH_CUSTOM_DEFAULT(float4, Color, float4(1, 2, 3, 4));
}