OpenGL Requirements

current plan is to target

• OpenGL 3.3 (Windows+NVIDIA/AMD/Intel, Linux+NVIDIA/AMD)
• OpenGL 3.2 + extn (OSX)
• OpenGL 3.1 + extn (mesa 9.1/9.2 Linux + Intel)
• GLSL1.4 + extn (move to 1.5 once mesa catches up)
• OpenGL ES 3.0 (mobile, someday, no hurry)

available extension

• ARB_debug_output (Mesa,NVIDIA,?)
• ARB_explicit_attrib_location (GL3.3,Mesa,OSX)
• ARB_instanced_arrays (GL3.3,Mesa,OSX)
• ARB_texture_storage (GL4.2,Mesa) - immutable textures, create/upload without glBindTexture() yay!

nice to have extensions

• ARB_separate_shader_objects (GL4.1,Mesa,OSX)
• ARB_sampler_objects (GL3.3,Mesa)
• ARB_vertex_attrib_binding (GL4.3)

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As of GDC 2013, only 5% of Steam HW Survey machines didn't support OpenGL3+, only 17% didn't support D3D10+. (Why the difference? OpenGL3 is available to more machines (XP, etc) than D3D10)

http://store.steampowered.com/hwsurvey

features/capabilities/compatibility

• OSX OGL Features
• Mesa 9.1 Features
• Mesa 9.2 Features
• Mesa Master Features
• OpenGL Matrix

specifications

• OpenGL 3.3 Core
• GLSL 3.30.6
• OpenGL 3.2 Core
• GLSL 1.50.11
• OpenGL 3.1
• GLSL 1.40.08
• Khronos Extension Registry