Make HDR code build on systems where patched Qt is not available
You need to add -DHAVE_HDR to enable HDR-related code. But you will need a patched Qt for that. The patch also makes the code behave correctly on Linux systems. PS: The patch also makes it possible to select OpenGL ES renderer on Linux. The renderer is selected fine, but doesn't work for some reason. I guess some texture format is set incorrectly.
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