i965/rbc: Clarify rational given for shader image resolves

Original commit added documentation explaining lossless compression
case:

commit 56f29911ec9da25c78fbd3d4945d499e65ca4b5a
Author: Topi Pohjolainen <topi.pohjolainen@intel.com>
Date:   Tue Feb 2 10:00:41 2016 +0200

    i965: Add a flag telling color resolve pass to ignore CCS_E

It, however, easily gives the impression that the sole purpose
of the intel_miptree_resolve_color() is to address lossless
compression. Original intention is to document the lack of
INTEL_MIPTREE_IGNORE_CCS_E flag given for the resolve call.

This patch fixes this along with a typo found spotted further
down.

Signed-off-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

diff --git a/src/mesa/drivers/dri/i965/brw_context.c b/src/mesa/drivers/dri/i965/brw_context.c
index 0e36d47..c28401a 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_context.c
+++ b/src/mesa/drivers/dri/i965/brw_context.c
@@ -283,8 +283,9 @@ intel_update_state(struct gl_context * ctx, GLuint new_state)
                /* Access to images is implemented using indirect messages
                 * against data port. Normal render target write understands
                 * lossless compression but unfortunately the typed/untyped
-                * read/write interface doesn't. Therefore the compressed
-                * surfaces need to be resolved prior to accessing them.
+                * read/write interface doesn't. Therefore even lossless
+                * compressed surfaces need to be resolved prior to accessing
+                * them. Hence skip setting INTEL_MIPTREE_IGNORE_CCS_E.
                 */
                intel_miptree_resolve_color(brw, tex_obj->mt, 0);
 
@@ -300,7 +301,7 @@ intel_update_state(struct gl_context * ctx, GLuint new_state)
       }
    }
 
-   /* Resolve color buffers for non-coherent framebufer fetch. */
+   /* Resolve color buffers for non-coherent framebuffer fetch. */
    if (!ctx->Extensions.MESA_shader_framebuffer_fetch &&
        ctx->FragmentProgram._Current &&
        ctx->FragmentProgram._Current->Base.OutputsRead) {