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shader: Fix emulation for 1D and emulation for rect textures on a GLES host

Gert Wollny requested to merge gerddie/virglrenderer:emulate-tex2DRect-on-gles into master

This series fixes texelFetch for emulated 1D textures, and adds emulation for sampler2DRect and sampler2DShadowRect.

A number of piglits are fixed by this: textureGather with 2DRECT texture arb_fragment_program_shadow/tex-shadow2drect arb_fragment_program_shadow/txp-shadow2drect glsl-fs-texture2drect -proj3 and -proj4

For some one still has to force GL 3.3 in the guest because of the required GLSL version.

Edited by Gert Wollny

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