Targeting graphics APIs and platforms in HLSL

Some #pragma directives take parameters that allow you to target specific graphics APIs and platforms. This page contains information on using those directives, and provides a list of valid parameter values.

包含或排除图形 API

By default, Unity compiles all shader programs for each graphics API in the list for the current build target. Sometimes, you might want to compile certain shader programs only for certain graphics APIs; for example, if you use features that are not supported on all platforms.

To compile a shader program only for given APIs, use the #pragma only_renderers directive. You can pass multiple values, space delimited.

This example demonstrates how to compile shaders only for Metal and Vulkan:

#pragma only_renderers metal vulkan

To exclude shader code from compilation by given compilers, use the #pragma exclude_renderers directive. You can pass multiple values, space delimited.

This example demonstrates how to exclude a shader from compilation for Metal and Vulkan:

#pragma exclude_renderers metal vulkan

Generating shader variants for graphics tiers for a given graphics API

In the Built-in Render Pipeline, Unity automatically generates shader variants that correspond to graphics tiers under certain conditions. You can also force Unity to generate these variants, if required.

To do this, use the #pragma hardware_tier_variants preprocessor directive and specify the graphics APIs for which you want to generate tier shader variants.

For example, this instructs Unity to compile tier shader variants for Metal:

#pragma hardware_tier_variants metal

List of valid parameter values

Supported values are: