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gl-renderer: query EGL to determine if GL_TEXTURE_EXTERNAL_OES should be used

Michael Olbrich requested to merge mol/weston:external into master

Using the number of planes to determine if GL_TEXTURE_EXTERNAL_OES should be used is incorrect with some modifiers: For example RGBA with a I915_FORMAT_MOD_Y_TILED_CCS modifier has two planes.

Use eglQueryDmaBufModifiersEXT() to query if the current format/modifier only supports GL_TEXTURE_EXTERNAL_OES.

Use the current code as fallback of modifiers are not supported.

Signed-off-by: Michael Olbrich m.olbrich@pengutronix.de

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