Mesa (master): i965: Override swizzles for integer luminance formats.

[Kenneth Graunke]

Module: Mesa
Branch: master
Commit: 8cb18760cccf2c89d94c50ff14b330ec2d5c4a3c
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=8cb18760cccf2c89d94c50ff14b330ec2d5c4a3c

Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Fri Feb  6 02:06:27 2015 -0800

i965: Override swizzles for integer luminance formats.

The hardware's integer luminance formats are completely unusable;
currently we fall back to RGBA.  This means we need to override
the texture swizzle to obtain the XXX1 values expected for luminance
formats.

Fixes spec/EXT_texture_integer/texwrap formats bordercolor [swizzled]
on Broadwell - 100% of border color tests now pass on Broadwell.

Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>
Reviewed-by: Chris Forbes <chrisf at ijw.co.nz>
Cc: mesa-stable at lists.freedesktop.org

---

 src/mesa/drivers/dri/i965/brw_wm_surface_state.c |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
index 6456a61..5f81402 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
@@ -199,6 +199,14 @@ brw_get_texture_swizzle(const struct gl_context *ctx,
       swizzles[1] = SWIZZLE_ZERO;
       swizzles[2] = SWIZZLE_ZERO;
       break;
+   case GL_LUMINANCE:
+      if (t->_IsIntegerFormat) {
+         swizzles[0] = SWIZZLE_X;
+         swizzles[1] = SWIZZLE_X;
+         swizzles[2] = SWIZZLE_X;
+         swizzles[3] = SWIZZLE_ONE;
+      }
+      break;
    case GL_RED:
    case GL_RG:
    case GL_RGB: