i965/blorp: Add support for sampling 3D textures

This patch adds additional MOV instruction for all blorp programs
that use SHADER_OPCODE_TXF. Alternative is to augment blorp program
key to tell if z-coordinate is needed, add condition to the blorp
blit compiler and to produce a variant with and without the MOV.
This seems a little overkill.

Signed-off-by: Topi Pohjolainen <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

1 files changed, 7 insertions, 1 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_blorp.h b/src/mesa/drivers/dri/i965/brw_blorp.h
index 7ebcee27455..a1aaa2096f2 100644
--- a/src/mesa/drivers/dri/i965/brw_blorp.h
+++ b/src/mesa/drivers/dri/i965/brw_blorp.h
@@ -196,8 +196,14 @@ struct brw_blorp_wm_push_constants
    float rect_grid_y1;
    brw_blorp_coord_transform_params x_transform;
    brw_blorp_coord_transform_params y_transform;
+
+   /* Minimum layer setting works for all the textures types but texture_3d
+    * for which the setting has no effect. Use the z-coordinate instead.
+    */
+   uint32_t src_z;
+
    /* Pad out to an integral number of registers */
-   uint32_t pad[6];
+   uint32_t pad[5];
 };
 
 /* Every 32 bytes of push constant data constitutes one GEN register. */