74 lines
5.3 KiB
Text
74 lines
5.3 KiB
Text
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.. _doc_mobile_rendering_limitations:
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Mobile rendering limitations
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============================
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.. seealso::
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The general :ref:`doc_3d_rendering_limitations` also apply to mobile platforms.
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To improve out-of-the-box performance on mobile devices, Godot automatically uses
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low-end-friendly settings by default on both Android and iOS. These are configured
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by project settings with a ``.mobile`` :ref:`feature tag <doc_feature_tags>` suffix.
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One of the most notable changes on mobile that will affect 3D projects is that
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lighting is done per-vertex instead of per-pixel. This improves performance a
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lot, but can break rendering in some scenes, especially if your meshes aren't
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sufficiently subdivided for per-vertex lighting to look good. This can be
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disabled in the Project Settings at a performance cost (see below).
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When using GLES2, some custom shaders may break when exporting to Android. This
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is caused by a lower shader precision being used by default to improve
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performance. You can force high precision on all shader computations by enabling
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``rendering/gles2/compatibility/enable_high_float.Android`` project setting, but
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this has a significant performance cost and won't work on all devices.
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The following project settings have mobile-specific overrides:
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+---------------------------------------------------------------------------+-----------------+--------------------+
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| Setting | Desktop default | Mobile default |
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+---------------------------------------------------------------------------+-----------------+--------------------+
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| ``rendering/quality/directional_shadow/size`` | 4096 | 2048 |
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+---------------------------------------------------------------------------+-----------------+--------------------+
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| ``rendering/quality/intended_usage/framebuffer_allocation`` | 3D | 3D Without Effects |
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+---------------------------------------------------------------------------+-----------------+--------------------+
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| ``rendering/quality/lightmapping/use_bicubic_sampling`` | ``true`` | ``false`` |
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+---------------------------------------------------------------------------+-----------------+--------------------+
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| ``rendering/quality/reflections/high_quality_ggx`` | ``true`` | ``false`` |
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+---------------------------------------------------------------------------+-----------------+--------------------+
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| ``rendering/quality/shading/force_blinn_over_ggx`` | ``false`` | ``true`` |
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+---------------------------------------------------------------------------+-----------------+--------------------+
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| ``rendering/quality/shading/force_lambert_over_burley`` | ``false`` | ``true`` |
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+---------------------------------------------------------------------------+-----------------+--------------------+
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| ``rendering/quality/shading/force_vertex_shading`` | ``false`` | ``true`` |
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+---------------------------------------------------------------------------+-----------------+--------------------+
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| ``rendering/quality/shadow_atlas/size`` | 4096 | 2048 |
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+---------------------------------------------------------------------------+-----------------+--------------------+
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| ``rendering/quality/shadows/filter_mode`` | PCF5 | Disabled |
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+---------------------------------------------------------------------------+-----------------+--------------------+
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| *GLES3 only:* ``rendering/gles3/shaders/max_simultaneous_compiles`` | 2 | 1 |
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+---------------------------------------------------------------------------+-----------------+--------------------+
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| *GLES3 only:* ``rendering/gles3/shaders/shader_cache_size_mb`` | 512 | 128 |
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+---------------------------------------------------------------------------+-----------------+--------------------+
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| *GLES3 only:* ``rendering/quality/depth/hdr`` | ``true`` | ``false`` |
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+---------------------------------------------------------------------------+-----------------+--------------------+
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| *GLES3 only:* ``rendering/quality/reflections/texture_array_reflections`` | ``true`` | ``false`` |
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+---------------------------------------------------------------------------+-----------------+--------------------+
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See the :ref:`ProjectSettings class documentation <class_ProjectSettings>`
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for more information on those setting overrides.
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If you're only targeting mobile platforms in your project, consider changing the
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project settings' values to match the mobile overrides. This way, you'll get a
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preview that is closer to the mobile appearance when running the project on a
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desktop platform (as well as within the editor).
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.. warning::
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Due to driver bugs, GLES3 support on Android and iOS can be poor, especially
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on old or low-end devices. Therefore, it is recommended to use the GLES2
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renderer when targeting mobile platforms (especially Android).
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You can change the rendering backend in the Project Settings
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(**Rendering > Quality > Driver > Driver Name**).
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