[Mesa-dev] [PATCH 1/3] i965: Override swizzles for integer luminance formats.

[Kenneth Graunke]

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>
Cc: 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:
-- 
2.2.2