[TRACKER] 4.x OpenGL Compatibility renderer issues

[Calinou]

This issue tracks issues specific to the OpenGL renderer in Godot 4. Godot 3 issues are not tracked here.

See also #55871, which is specific to Vulkan Mobile-only issues.

Bugs

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1. OpenGL: Directional Shadow Splits debug draw mode is not implemented #46129
   bug topic:3d topic:rendering +3
2. Implement automatic OpenGL fallback for GPUs not supporting Vulkan #58927
   archived bug confirmed enhancement topic:editor topic:porting topic:rendering +7
3. Console errors on the 4.0 Web editor #65702
   bug platform:web topic:porting topic:rendering +4
4. OpenGL: GUI rendering issues when hiding nodes #65977
   bug topic:2d topic:rendering +3
   
5. OpenGL: Environment fog does not affect sky rendering #66456
   bug confirmed topic:3d topic:rendering +4
6. OpenGL: Fog color is incorrect if one of the components is exactly 0 #66459
   bug topic:3d topic:rendering +3
7. OpenGL: Fog color is inverted if density is exactly 0 #66462
   bug topic:3d topic:rendering +3
8. OpenGL: Font rendering quality is worse than in Vulkan #66463
   bug topic:gui topic:rendering +3
9. OpenGL: FPS reported by View Frame Time is incorrect due to missing CPU/GPU frame timing information #66464
   bug topic:editor topic:rendering +3
10. NaN diffuse lighting artifacts on lights with very high Attenuation values #68464
    bug topic:3d topic:rendering +3
11. OpenGL: Window stretch mode canvas_items or viewport leaves uncleared section if using keep, keep_width or keep_height stretch aspect #71799
    bug confirmed topic:rendering +3
12. A 3D material with blend mode "subtract" causes the editor to render completely black in compatibility mode. #72488
    bug topic:3d topic:rendering +3
13. Viewport background transparency not working with environment sky in Compatibility renderer #72602
    bug confirmed topic:3d topic:rendering +4
14. OpenGL: Shader render mode blend_mul not working correctly in (and alpha effecting blend modes that shouldn't use alpha) #72873
    bug topic:3d topic:rendering +3
15. OpenGL: GPUParticles2D with Color alpha set to 0 are not transparent #72882
    bug topic:3d topic:particles topic:rendering +4
16. OpenGL: Point rendering not working #73826
    bug topic:3d topic:rendering +3
17. GridMap renders 3D meshes as solid black with "Compatibility" renderer #74111
    bug confirmed topic:3d topic:rendering +4
18. OpenGL: Blend modes other than Mix don't work unless Depth Draw Mode is set to Never #76334
    bug good first issue topic:3d topic:rendering +4
19. OpenGL: Godot Editor renders blank interface at launch when using eGPU on macOS #76802
    archived bug platform:macos topic:rendering +4
20. Anisotropic Filtering not disabled when switching filtering mode in Compatibility renderer #79567
    bug topic:3d topic:rendering +3
21. Project windows jump up after they appear on screen #79581
    bug regression topic:porting +3
22. Mobile/Compatibility: SpotLight and OmniLight cull masks don't cull moving meshes #82263
    bug confirmed topic:3d topic:rendering +4
23. OpenGL: Debug draw modes are not working #82485
    bug confirmed topic:3d topic:editor topic:rendering +5
24. OpenGL: Directional shadow rendering works in the editor, but not in the running project #82503
    bug confirmed topic:3d topic:rendering +4
    
25. OpenGL: DirectionalLight3D applies Fade Start incorrectly when using PSSM 2 Splits or 4 Splits mode #82505
    bug topic:3d topic:rendering +3
26. OpenGL: Clearcoat has no effect if BaseMaterial3D roughness is exactly 0 #83223
    bug topic:3d topic:rendering +3
27. OpenGL: OmniLight3D PCF shadow filtering not implemented #83313
    bug confirmed topic:3d topic:rendering +4
28. HDR skybox colors are too dark/bright with compatibility renderer #83788
    bug topic:3d topic:rendering +3
29. Shadows cannot be disabled in the material in the Compatibility renderer #84386
    bug topic:3d topic:rendering +3
30. Physical sky is too dark on compatibility renderer #84441
    bug topic:3d topic:rendering +3
31. VisibleOnScreenNotifier3D does not work with gles3 #87176
    bug topic:3d topic:rendering +3
32. --gpu-index is ineffective when using the Compatibility rendering method #87763
    discussion topic:rendering +2
33. OpenGL: SpotLight3D shadows occasionally use the wrong texture after moving the camera away from them #92091
    bug confirmed topic:3d topic:rendering +4
34. FOG writing in shaders fails with Compatibility renderer unless enabled via WorldEnvironment #94183
    bug topic:3d topic:rendering topic:shaders +4
35. OpenGL: Baking lightmaps has broken emissive material properties #94406
    bug topic:3d topic:rendering +3
36. OpenGL: Condition "t->is_render_target" is true. is printed every time LightmapGI is baked with Environment mode set to Scene or Custom Sky #94407
    bug confirmed topic:3d topic:rendering +4
37. OpenGL: Selecting a lightmap EXR texture in the FileSystem dock prints an error about SamplerCubeArray not being supported #94408
    bug confirmed topic:editor topic:rendering +4
38. Black screen in XR on linux when using compatibility renderer #94455
    archived bug platform:linuxbsd topic:rendering topic:xr +5
39. On a GPUParticles2D, when using Compatibility renderer, "reverse lifetime" draw order and non-local coords don't play nice. #95042
    bug topic:2d topic:particles topic:rendering +4
40. Editor freeze when right clicking on second display with Compatibility rendering mode #95873
    bug needs testing platform:windows topic:editor topic:porting +5

Missing features compared to 3.x GLES3

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1. OpenGL: Environment glow not implemented yet #66455
   enhancement regression topic:rendering +3
2. OpenGL: Environment adjustments not implemented yet #66457
   enhancement regression topic:rendering +3
3. OpenGL: Light3D shadow rendering is not reimplemented yet #66596
   bug topic:3d topic:rendering +3
   
4. OpenGL: 2D MSAA antialiasing is not reimplemented yet (3D available since 4.3.dev1) #69462
   regression topic:rendering +2
5. OpenGL: FXAA antialiasing is not reimplemented yet #69463
   topic:3d topic:rendering +2
6. OpenGL: textureLod() is blocky due to using linear mipmaps instead of Gaussian #72823
   discussion enhancement topic:rendering topic:shaders +4
7. OpenGL: TextureArrays and Texture3D samplers not implemented yet #71029
   bug topic:rendering topic:shaders +3
8. OpenGL: ReflectionProbe is not reimplemented yet #86318
   bug confirmed topic:3d topic:rendering +4

Enhancements

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1. OpenGL: Light3D Shadow Blur property is ignored #82504
   enhancement topic:3d topic:rendering +3
2. GeometryInstance3D transparency does not work in mobile or compatibility renderers #76774
   confirmed enhancement topic:3d topic:rendering +4
3. Compatibility renderer has lower-quality (ir)radiance map generation than Forward+ and Mobile #95091
   bug topic:3d topic:rendering +3

Pull requests

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1. Hide volumetric fog, SSIL and SDFGI on Mobile/Compatibility renderers #66465
   archived bug topic:editor +3
2. Disable creating RD projects in project manager if RD is not supported #91172
   enhancement topic:editor +2

[mrjustaguy]

Says Projectors, Reflection Probes and Lightmaps are not supported but planned in warnings but not here in missing features

[TokisanGames]

How about adding the standard OpenGLES integer texture formats, since they are supported by hardware, the RenderingDevice, and shaders? Since we don't have buffers, textures are the only options, and floats are cumbersome and wasteful to work with when you want bit-packed integer based data blocks or control maps without texture filtering or float conversion.

Proposal: godotengine/godot-proposals#7540

FORMAT_RF Workaround: #57841 (comment)