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[Mobile][Linear] IMGUI objects are brighter in the mobile Build when Linear Color Space is used

Mobile Graphics


How to reproduce:
1. Open the user's attached "BugIMGUIlinearAndroid" project
2. Connect Android (or iOS) device
3. Open the Build Settings... (File->Build Settings...)
4. Switch to the Android Platform
5. Build and Run the "SampleScene"

Expected results: All the squares are the same color
Actual results: The IMGUI squares (on the left) are brighter than the middle ones

Reproducible with: 2019.4.29f1, 2020.3.15f1, 2021.1.16f1, 2021.2.0b5, 2022.1.0a4

Reproducible on:
VLNQA00286, Meizu Pro 5 (PRO 5), Android 7.0, CPU: Exynos 7 Octa 7420, GPU: Mali-T760
VLNQA00313, Huawei Y6 Ⅱ Compact (HUAWEI LYO-L01), Android 5.1, CPU: MediaTek MT6735, GPU: Mali-T720
VLNQA00294, Oppo OPPO Reno Z (PCDM10), Android 11, CPU: NOT FOUND, GPU: PowerVR Rogue GM9446
VLNQA00335, Samsung Galaxy S20+ 5G (SM-G986B), Android 10, CPU: Exynos 990, GPU: Mali-G77
iPhone 12 Pro (iOS 14.2.1), iPhone 6S (iOS 13.3.1)

- The issue has been reproduced on OpenGLES3 with Linear Color Space
- The issue is also reproducible with Vulkan and Linear Color Space but only if SRGB Write Mode is disabled in the Vulkan Settings

  1. Resolution Note (2022.1.X):

    IMGUI does not support Linear Color Space and it's not recommended for Player Runtime.
    Please use a different UI system.

Comments (1)

  1. Waz

    Jul 31, 2021 02:22

    Currently I'm working around this issue by using:

    GUI.color = theColor.linear;

    The [ColorUsage] could probably also be used somehow, but I couldn't even find confirmation that the regular Color was always interpreted as sRGB.

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