Example of a DOTS Instancing shader that accesses constant data in URP

In this example:

• The metadata value for Color is 0x00001000.
• The instance index is 5.
• Data for instance 0 starts at address 0x1000.
• The most significant bit is not set so data for instance 5 is at the same address as instance 0.

Because the most significant bit is not set, the accessor macros that fall back to defaults don’t access unity_DOTSInstanceData. This means that:

• c0 will contain the value from unity_DOTSInstanceData address 0x1000.
• c1 will contain the value of the regular material property Color, and cause a compile error if the Color property doesn’t exist.
• c2 will contain (1, 2, 3, 4) because that was passed as the explicit default value.

void ExampleConstant()
{
    // rawMetadataValue will contain 0x00001000
    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));
}