blorp: allow blits with floating point source layers

The current blorp API only allows source layers for 3D images to be
integers. That is causing problems with the Vulkan API where we need
to be able to use a 3D layer that could be in between 2 layers.

This change allows a floating point value to be passed for blits and
internally sets up the input parameters to pass floating point values
to kernels.

v2: Use tex op to determinate what types are the coordinates (Jason)
    Drop setting params->z (Lionel)

v3: Fix nir_texop_txf_ms_mcs op not considered as having integer coords (Lionel)

v4: Fix incorrect test on nir_texop_txf_ms_mcs (Ivan)

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/3458
Cc: <mesa-stable@lists.freedesktop.org>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6909>

src/intel/blorp/blorp.h

@@ -133,7 +133,7 @@ enum blorp_filter {
 void
 blorp_blit(struct blorp_batch *batch,
            const struct blorp_surf *src_surf,
-           unsigned src_level, unsigned src_layer,
+           unsigned src_level, float src_layer,
            enum isl_format src_format, struct isl_swizzle src_swizzle,
            const struct blorp_surf *dst_surf,
            unsigned dst_level, unsigned dst_layer,