gallium: add a RESQ opcode to query info about a resource

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/gallium/auxiliary/tgsi/tgsi_info.c

@@ -142,7 +142,7 @@ static const struct tgsi_opcode_info opcode_info[TGSI_OPCODE_LAST] =
    { 0, 0, 0, 0, 0, 1, 0, NONE, "ENDSUB", TGSI_OPCODE_ENDSUB },
    { 1, 1, 1, 0, 0, 0, 0, OTHR, "TXQ_LZ", TGSI_OPCODE_TXQ_LZ },
    { 1, 1, 1, 0, 0, 0, 0, OTHR, "TXQS", TGSI_OPCODE_TXQS },
-   { 0, 0, 0, 0, 0, 0, 0, NONE, "", 105 },     /* removed */
+   { 1, 1, 0, 0, 0, 0, 0, NONE, "RESQ", TGSI_OPCODE_RESQ },
    { 0, 0, 0, 0, 0, 0, 0, NONE, "", 106 },     /* removed */
    { 0, 0, 0, 0, 0, 0, 0, NONE, "NOP", TGSI_OPCODE_NOP },
    { 1, 2, 0, 0, 0, 0, 0, COMP, "FSEQ", TGSI_OPCODE_FSEQ },

src/gallium/docs/source/tgsi.rst

@@ -2311,6 +2311,18 @@ Resource Access Opcodes
                texture arrays and 2D textures.  address.w is always
                ignored.
 
+.. opcode:: RESQ - Query information about a resource
+
+  Syntax: ``RESQ dst, resource``
+
+  Example: ``RESQ TEMP[0], BUFFER[0]``
+
+  Returns information about the buffer or image resource. For buffer
+  resources, the size (in bytes) is returned in the x component. For
+  image resources, .xyz will contain the width/height/layers of the
+  image, while .w will contain the number of samples for multi-sampled
+  images.
+
 
 .. _threadsyncopcodes:
 

src/gallium/include/pipe/p_shader_tokens.h

@@ -411,6 +411,7 @@ struct tgsi_property_data {
 #define TGSI_OPCODE_ENDSUB              102
 #define TGSI_OPCODE_TXQ_LZ              103 /* TXQ for mipmap level 0 */
 #define TGSI_OPCODE_TXQS                104
+#define TGSI_OPCODE_RESQ                105
                                 /* gap */
 #define TGSI_OPCODE_NOP                 107