pan/bi: Document when dual-tex is triggered

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4671>

diff --git a/src/panfrost/bifrost/disassemble.c b/src/panfrost/bifrost/disassemble.c
index 5c655a2db22118e109d5879c1654105a903f1a71..bdf4ced3ae6d23d4225a8ba5852e02fb81d8bdf7 100644 (file)
--- a/src/panfrost/bifrost/disassemble.c
+++ b/src/panfrost/bifrost/disassemble.c
@@ -1415,7 +1415,11 @@ static void dump_add(FILE *fp, uint64_t word, struct bifrost_regs regs,
                         struct bifrost_tex_ctrl ctrl;
                         memcpy((char *) &ctrl, (char *) &controlBits, sizeof(ctrl));
 
-                        // TODO: figure out what actually triggers dual-tex
+                        /* Dual-tex triggered for adjacent texturing
+                         * instructions with the same coordinates to different
+                         * textures/samplers. Observed for the compact
+                         * (2D/normal) case. */
+
                         if (ctrl.result_type == 9) {
                                 struct bifrost_dual_tex_ctrl dualCtrl;
                                 memcpy((char *) &dualCtrl, (char *) &controlBits, sizeof(ctrl));