Parameters

Parameters are effect variables.

Syntax

usage  type  id  [: semantic]  [< annotation(s) >]  [= expression];

Parameters can be read from and written to by the application with ID3DXEffect or ID3DXEffectCompiler.

Parameters can be referenced in functions and in techniques (specifically, in the right side of state assignments).

• usage - Scope of the parameter. See Usages and Literals.
• type - Any valid High-Level Shader Language type.
• id - A unique identifier. See IDs and Semantics.
• semantic - A tag following identifer rules that typically indicates the usage of the parameter. Must be a particular type. See IDs and Semantics.
• annotations - Zero or more pieces of user-specific information. May be any type. See Annotations.
• expression - Initializes the parameter's value. See Expressions.

Parameters can be initialized to any valid High-Level Shader Language expression that reduces to a literal value.

Parameter values are not changed by the execution of state assignment or function calls.