wm4 a0b43a11e4 vo_gl3: make it work on OpenGL 2.1 ... Now vo_gl3 should work with standard OpenGL 2.1, as long as the GL_ARB_texture_rg extension is available. Optional features, which require features that are always in OpenGL 3.0, but are available as extensions only in OpenGL 2.1, are automatically disabled. The force-gl2 suboption, which was an unreliable hack to run vo_gl3 in an OpenGL 2.1 context, is removed. Significant changes are done to the extension loader to make it easier to identify optional OpenGL features. Context creation is a bit changed to simplify the code and to handle the fallback better if OpenGL 3 context creation fails, and creating an OpenGL legacy context is attempted. Based on the initial work by Rudolf Polzer <divverent@xonotic.org>, which included making the shader GLSL 1.20 compatible, and more.		2012-10-03 03:17:38 +02:00
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en	vo_gl3: make it work on OpenGL 2.1	2012-10-03 03:17:38 +02:00