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[glsl-out] Feature to generate samplerExternalOES instead of sampler2D #4528

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@i509VCB

samplerExternalOES is defined in https://registry.khronos.org/OpenGL/extensions/OES/OES_EGL_image_external.txt

This sampler is needed if the texture from an EGLImage that could be backed by external memory such as AHardwareBuffer or dmabuf.

This is related to the work to enable #2320

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    area: naga back-endOutputs of naga shader conversionhelp requiredWe need community help to make this happen.lang: GLSLOpenGL Shading LanguagenagaShader Translatortype: enhancementNew feature or request

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