"Lukas F. Hartmann" <lu...@mntmn.com> writes: > Hi, > > I upgraded Xwayland and the assorted libraries from git masters today, > and noticed that glamor wouldn't work anymore on i.MX6/etnaviv. The > error was: > > No provider of glVertexAttribDivisor found. Requires one of: > Desktop OpenGL 3.3 > OpenGL ES 3.0 > GL extension "GL_ANGLE_instanced_arrays" > GL extension "GL_ARB_instanced_arrays" > GL extension "GL_EXT_instanced_arrays" > GL extension "GL_NV_instanced_arrays" > > The problem is that etnaviv offers GLSL 140 on GL 2.1 and glamor > rendering assumes that glVertexAttribDivisor() is always available on > GLSL>=130, which is not the case here. Forcing GLSL 120 makes glamor > work fine again on this platform. After chatting with ajax in > #xorg-devel, the following solution was proposed.
In Mesa we've decided in the past to not expose GLSL >= 1.30 on GL 2.x, because you can't use most of the new functionality of GLSL 1.30 without GL 3.x's APIs. However, it would be awfully nice for glamor if Mesa drivers *could* expose 1.30 on GL2 (if you've got integer textures, you could do glamor_font.c's accelerated core text rendering, for example), so I'm tempted to take the patch for now so we can start working toward that. Reviewed-by: Eric Anholt <e...@anholt.net> but I'll give others a chance to offer input on this.
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