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Fixed

Fixed in 6000.2.8f1, 6000.3.0b6, 6000.4.0a2

Votes

2

Found in

6000.2.0b5

6000.3.0a1

6000.4.0a1

Issue ID

UUM-108902

Regression

Yes

[Vulkan] The shader compiler shows an "undeclared identifier '_BaseMap_ST'" error when compiling a specific shader

-

Reproduction steps:
1. Open the attached “IN-103129“ project
2. Select the Android Build Platform and/or the Vulkan Graphics API
3. In the Project window, select the “Assets/Broken Shader\_Vulkan_6_1_XRMotionVectorsFailCompilation_Test.shadergraph” asset
4. In the Inspector, press "Compile and show code"
5. Observe the Inspector

Expected result: No errors
Actual result: An “'undeclared identifier '_BaseMap_ST'“ error appears

Reproducible with: 6000.1.0a8, 6000.1.7f1, 6000.2.0b5
Not reproducible with: 2022.3.63f1, 6000.0.51f1, 6000.1.0a7

Reproducible environments: Windows 10 (by reporter), macOS 15.5
Not reproducible environments: No other environments tested
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Comments (1)

  1. Pav-FitXR

    Jul 08, 2025 10:59

    The issue happens only in SRP SpaceWarp compatible cases where user declared _ALPHATEST_ON keyword in their shader graph.

    The bug seems to step from the fact that XRMotionVectors makes use of/includes ObjectMotionVectors.hlsl regardless of whether SpaceWarp is actually enabled.
    causing a conflict in said .hlsl file due to presence of _ALPHATEST_ON keyword on the shader.

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