Fixed Subtract blend mode of Forward+ and Mobile renderers #77520
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… behaviour of the Godot 3 and Compatibility renderers The OpenGL implementation has used GL_FUNC_REVERSE_SUBTRACT for a long time, but the new RenderingDevice abstraction used by the Vulkan renderers had been mistakenly set to BLEND_OP_SUBTRACT instead of BLEND_OP_REVERSE_SUBTRACT. Fixes godotengine#77448
clayjohn
approved these changes
May 26, 2023
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Looks good to me.
Note for production team: This technically breaks compatibility as it will change the behaviour of any material using BLEND_MODE_SUB. However, the break in compatibility is needed to make this feature work properly. Accordingly, I have not tagged this to cherrypick to 4.0, it should be merged for 4.1 only
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Changed Subtract blend mode of Forward+ and Mobile renderers to match behaviour of the Godot 3 and Compatibility renderers.
The OpenGL implementation has used GL_FUNC_REVERSE_SUBTRACT for a long time, but the new RenderingDevice abstraction used by the Vulkan renderers had been mistakenly set to BLEND_OP_SUBTRACT instead of BLEND_OP_REVERSE_SUBTRACT.
Fixes #77448