/usr/src/castle-game-engine-6.4/images/opengl/ is in castle-game-engine-src 6.4+dfsg1-2.
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/usr/src/castle-game-engine-6.4/images/opengl/castleglimages.pas
/usr/src/castle-game-engine-6.4/images/opengl/castleglimages_filter.inc
/usr/src/castle-game-engine-6.4/images/opengl/castleglimages_load_2d.inc
/usr/src/castle-game-engine-6.4/images/opengl/castleglimages_load_3d.inc
/usr/src/castle-game-engine-6.4/images/opengl/castleglimages_load_cubemap.inc
/usr/src/castle-game-engine-6.4/images/opengl/castleglimages_miscellaneous.inc
/usr/src/castle-game-engine-6.4/images/opengl/castleglimages_packing.inc
/usr/src/castle-game-engine-6.4/images/opengl/castleglimages_rendertotexture.inc
/usr/src/castle-game-engine-6.4/images/opengl/castleglimages_savescreen.inc
/usr/src/castle-game-engine-6.4/images/opengl/castleglimages_sprite.inc
/usr/src/castle-game-engine-6.4/images/opengl/castleglimages_texturememoryprofiler.inc
/usr/src/castle-game-engine-6.4/images/opengl/castleglimages_tglimage.inc
/usr/src/castle-game-engine-6.4/images/opengl/castleglimages_video.inc
/usr/src/castle-game-engine-6.4/images/opengl/castleglimages_wrap.inc
/usr/src/castle-game-engine-6.4/images/opengl/castleglshaders.pas
/usr/src/castle-game-engine-6.4/images/opengl/castleglutils.pas
/usr/src/castle-game-engine-6.4/images/opengl/castleglutils_context.inc
/usr/src/castle-game-engine-6.4/images/opengl/castleglutils_draw_primitive_2d.inc
/usr/src/castle-game-engine-6.4/images/opengl/castleglutils_errors.inc
/usr/src/castle-game-engine-6.4/images/opengl/castleglutils_features.inc
/usr/src/castle-game-engine-6.4/images/opengl/castleglutils_helpers.inc
/usr/src/castle-game-engine-6.4/images/opengl/castleglutils_information.inc
/usr/src/castle-game-engine-6.4/images/opengl/castleglutils_mipmaps.inc
/usr/src/castle-game-engine-6.4/images/opengl/castleglutils_types.inc
/usr/src/castle-game-engine-6.4/images/opengl/castlescreeneffects.pas
/usr/src/castle-game-engine-6.4/images/opengl/glsl/
/usr/src/castle-game-engine-6.4/images/opengl/glsl/Makefile
/usr/src/castle-game-engine-6.4/images/opengl/glsl/image.fs
/usr/src/castle-game-engine-6.4/images/opengl/glsl/image.fs.inc
/usr/src/castle-game-engine-6.4/images/opengl/glsl/image.vs
/usr/src/castle-game-engine-6.4/images/opengl/glsl/image.vs.inc
/usr/src/castle-game-engine-6.4/images/opengl/glsl/primitive_2.fs
/usr/src/castle-game-engine-6.4/images/opengl/glsl/primitive_2.fs.inc
/usr/src/castle-game-engine-6.4/images/opengl/glsl/primitive_2.vs
/usr/src/castle-game-engine-6.4/images/opengl/glsl/primitive_2.vs.inc