Bug 107989

Summary:	GLES 3.x context: GL_INVALID_OPERATION in glGenerateMipmap(invalid internal format GL_RED)
Product:	Mesa	Reporter:	Andrei Alexeyev <0x416b617269>
Component:	Mesa core	Assignee:	mesa-dev
Status:	RESOLVED NOTABUG	QA Contact:	mesa-dev
Severity:	normal
Priority:	medium
Version:	18.2
Hardware:	All
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Andrei Alexeyev 2018-09-19 09:30:24 UTC

Trying to call glGenerateMipmap on a texture with the internal format of GL_RED in an OpenGL ES 3.x context produces a GL_INVALID_OPERATION error. Explicitly sized formats such as GL_R8 work, and so do other formats with no size specified, such as GL_RGBA. Core context is not affected. Tested with the radeonsi and llvmpipe drivers.

Comment 1 Tapani Pälli 2018-09-19 10:07:24 UTC

For me it seems this behavior is according to the OpenGL ES spec:

"An INVALID_OPERATION error is generated if the level base array was not
specified with an unsized internal format from table 8.3 or a sized internal for-
mat that is both color-renderable and texture-filterable according to table 8.10."

Table 8.3 does not list GL_RED.

Comment 2 Andrei Alexeyev 2018-09-19 18:33:56 UTC

@Tapani Pälli: yes, you seem to be right. I somehow missed this bit. Sorry for the false alarm. I guess it's ANGLE exhibiting non-conformant behavior, then (unless it's covered by some extension that I'm not aware of).

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