gallium: add support for LODQ opcodes.

This opcode provide support for GL_ARB_texture_query_lod,

Signed-off-by: Dave Airlie <[email protected]>
[imirkin: rebase, docs update]
Signed-off-by: Ilia Mirkin <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>

2 files changed, 14 insertions, 0 deletions

diff --git a/src/gallium/docs/source/screen.rst b/src/gallium/docs/source/screen.rst
index 09f809db9c8..943d8807826 100644
--- a/src/gallium/docs/source/screen.rst
+++ b/src/gallium/docs/source/screen.rst
@@ -191,6 +191,8 @@ The integer capabilities:
 * ``PIPE_CAP_BUFFER_MAP_PERSISTENT_COHERENT``: Whether
   PIPE_TRANSFER_PERSISTENT and PIPE_TRANSFER_COHERENT are supported
   for buffers.
+* ``PIPE_CAP_TEXTURE_QUERY_LOD``: Whether the ``LODQ`` instruction is
+  supported.
 
 
 .. _pipe_capf:
diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst
index 5a64e16cefa..d5325f4a935 100644
--- a/src/gallium/docs/source/tgsi.rst
+++ b/src/gallium/docs/source/tgsi.rst
@@ -1012,6 +1012,18 @@ XXX doesn't look like most of the opcodes really belong here.
 
    dst = texture\_gather (uint, coord, compare)
 
+.. opcode:: LODQ - level of detail query
+
+   Compute the LOD information that the texture pipe would use to access the
+   texture. The Y component contains the computed LOD lambda_prime. The X
+   component contains the LOD that will be accessed, based on min/max lod's
+   and mipmap filters.
+
+.. math::
+
+   coord = src0
+
+   dst.xy = lodq(uint, coord);
 
 Integer ISA
 ^^^^^^^^^^^^^^^^^^^^^^^^