i915g: Fix depth/stencil glClear

This patch fixes a copy/paste error and masking of depth/stencil (stencil
is in the top 8 bits), and makes glean/readPixSanity happy.

Both the stencil and the depth buffer piglit test also pass if
glClear(DEPTH | STENCIL) is executed instead of
glClear(DEPTH)/glClear(STENCIL).

Reviewed-by: Daniel Vetter <[email protected]>
Tested-by: Christopher Egert <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>

1 files changed, 5 insertions, 6 deletions

diff --git a/src/gallium/drivers/i915/i915_clear.c b/src/gallium/drivers/i915/i915_clear.c
index d6e6f567b89..30a39262ae0 100644
--- a/src/gallium/drivers/i915/i915_clear.c
+++ b/src/gallium/drivers/i915/i915_clear.c
@@ -95,17 +95,16 @@ i915_clear_emit(struct pipe_context *pipe, unsigned buffers,
          if (buffers & PIPE_CLEAR_STENCIL
                || depth_tex->b.b.format != PIPE_FORMAT_Z24_UNORM_S8_UINT) {
             clear_params |= CLEARPARAM_WRITE_STENCIL;
-            clear_stencil = packed_z_stencil & 0xff;
-            clear_depth = packed_z_stencil;
-         } else
-            clear_depth = packed_z_stencil & 0xffffff00;
+            clear_stencil = packed_z_stencil >> 24;
+         }
 
+         clear_depth = packed_z_stencil & 0xffffff;
          depth_clear_bbp = 32;
       } else {
          clear_depth = (packed_z_stencil & 0xffff) | (packed_z_stencil << 16);
          depth_clear_bbp = 16;
       }
-   } else if (buffers & PIPE_CLEAR_DEPTH) {
+   } else if (buffers & PIPE_CLEAR_STENCIL) {
       struct pipe_surface *zbuf = i915->framebuffer.zsbuf;
 
       clear_params |= CLEARPARAM_WRITE_STENCIL;
@@ -114,7 +113,7 @@ i915_clear_emit(struct pipe_context *pipe, unsigned buffers,
 
       packed_z_stencil = util_pack_z_stencil(depth_tex->b.b.format, depth, stencil);
       depth_clear_bbp = 32;
-      clear_stencil = packed_z_stencil & 0xff;
+      clear_stencil = packed_z_stencil >> 24;
    }
 
    /* hw can't fastclear both depth and color if their bbp mismatch. */