/etc/drirc is in libgl1-mesa-dri 11.2.0-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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============================================
Application bugs worked around in this file:
============================================
* Unigine Heaven 3.0 and older contain too many bugs and can't be supported
  by drivers that want to be compliant.
* Various Unigine products don't use the #version and #extension GLSL
  directives, meaning they only get GLSL 1.10 and no extensions for their
  shaders.
  Enabling all extensions for Unigine fixes most issues, but the GLSL version
  is still 1.10.
* If ARB_sample_shading is supported, Unigine Heaven 4.0 and Valley 1.0 uses
  an #extension directive in the middle of its shaders, which is illegal
  in GLSL.
TODO: document the other workarounds.
-->
<driconf>
    <!-- Please always enable app-specific workarounds for all drivers and
         screens. -->
    <device>
        <application name="Unigine Sanctuary" executable="Sanctuary">
            <option name="force_glsl_extensions_warn" value="true" />
            <option name="disable_blend_func_extended" value="true" />
	</application>
        <application name="Unigine Tropics" executable="Tropics">
            <option name="force_glsl_extensions_warn" value="true" />
            <option name="disable_blend_func_extended" value="true" />
	</application>
        <application name="Unigine Heaven (32-bit)" executable="heaven_x86">
            <option name="allow_glsl_extension_directive_midshader" value="true" />
            <!-- remove dual_color_blend_by_location if 4.1 ever comes out -->
            <option name="dual_color_blend_by_location" value="true" />
	</application>
        <application name="Unigine Heaven (64-bit)" executable="heaven_x64">
            <option name="allow_glsl_extension_directive_midshader" value="true" />
            <!-- remove dual_color_blend_by_location if 4.1 ever comes out -->
            <option name="dual_color_blend_by_location" value="true" />
	</application>
        <application name="Unigine Valley (32-bit)" executable="valley_x86">
            <option name="allow_glsl_extension_directive_midshader" value="true" />
            <!-- remove dual_color_blend_by_location if 1.1 ever comes out -->
            <option name="dual_color_blend_by_location" value="true" />
	</application>
        <application name="Unigine Valley (64-bit)" executable="valley_x64">
            <option name="allow_glsl_extension_directive_midshader" value="true" />
            <!-- remove dual_color_blend_by_location if 1.1 ever comes out -->
            <option name="dual_color_blend_by_location" value="true" />
	</application>
        <application name="Unigine OilRush (32-bit)" executable="OilRush_x86">
            <option name="disable_blend_func_extended" value="true" />
            <option name="allow_glsl_extension_directive_midshader" value="true" />
	</application>
        <application name="Unigine OilRush (64-bit)" executable="OilRush_x64">
            <option name="disable_blend_func_extended" value="true" />
            <option name="allow_glsl_extension_directive_midshader" value="true" />
	</application>
        <application name="Savage 2" executable="savage2.bin">
            <option name="disable_glsl_line_continuations" value="true" />
        </application>
        <application name="Topogun (32-bit)" executable="topogun32">
            <option name="always_have_depth_buffer" value="true" />
        </application>
        <application name="Topogun (64-bit)" executable="topogun64">
            <option name="always_have_depth_buffer" value="true" />
        </application>
        <application name="Dead Island" executable="DeadIslandGame">
            <option name="allow_glsl_extension_directive_midshader" value="true" />
        </application>
        <application name="Second Life" executable="do-not-directly-run-secondlife-bin">
            <option name="allow_glsl_extension_directive_midshader" value="true" />
        </application>
    </device>
</driconf>
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