This patch has a regressing side-effect: it disables CCS for all single-sample
miptrees created by glRenderbufferStorage(). After stepping through some Piglit
tests, I believe the problem is that line 161 below always returns false for
such miptrees because mt->is_scanout is true. I don't understand why
mt->is_scanout would be set for those miptrees.
The CCS gets disabled even if app never uses EGLImage nor modifiers.
149 bool
150 intel_miptree_supports_non_msrt_fast_clear(struct brw_context *brw,
151 const struct
intel_mipmap_tree *mt)
152 {
153 /* MCS support does not exist prior to Gen7 */
154 if (brw->gen < 7)
155 return false;
156
157 if (mt->aux_disable & INTEL_AUX_DISABLE_MCS)
158 return false;
159
160 if (mt->is_scanout && mt->msaa_layout != INTEL_MSAA_LAYOUT_CMS)
**161 return false;
That explains why 'egl_khr_gl_renderbuffer_image-clear-shared-image GL_RGBA'
passes on this patch series.
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