From: Iago Toral Quiroga <itoral@igalia.com>
Date: Thu, 30 Jun 2016 09:03:17 +0000 (+0200)
Subject: i965/vec4/tcs: fix outputs for 64-bit data
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=3e294ab8931296999e2cabdd7b1817f9a461beca;p=mesa.git

i965/vec4/tcs: fix outputs for 64-bit data

v2: use byte_offset() instead of offset()

Reviewed-by: Matt Turner <mattst88@gmail.com>
---

diff --git a/src/mesa/drivers/dri/i965/brw_vec4_tcs.cpp b/src/mesa/drivers/dri/i965/brw_vec4_tcs.cpp
index 66cc837748c..bfa22458f0e 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_tcs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_tcs.cpp
@@ -444,13 +444,40 @@ vec4_tcs_visitor::nir_emit_intrinsic(nir_intrinsic_instr *instr)
 
       unsigned first_component = nir_intrinsic_component(instr);
       if (first_component) {
+         if (nir_src_bit_size(instr->src[0]) == 64)
+            first_component /= 2;
          assert(swiz == BRW_SWIZZLE_XYZW);
          swiz = BRW_SWZ_COMP_OUTPUT(first_component);
          mask = mask << first_component;
       }
 
-      emit_urb_write(swizzle(value, swiz), mask,
-                     imm_offset, indirect_offset);
+      if (nir_src_bit_size(instr->src[0]) == 64) {
+         /* For 64-bit data we need to shuffle the data before we write and
+          * emit two messages. Also, since each channel is twice as large we
+          * need to fix the writemask in each 32-bit message to account for it.
+          */
+         value = swizzle(retype(value, BRW_REGISTER_TYPE_DF), swiz);
+         dst_reg shuffled = dst_reg(this, glsl_type::dvec4_type);
+         shuffle_64bit_data(shuffled, value, true);
+         src_reg shuffled_float = src_reg(retype(shuffled, BRW_REGISTER_TYPE_F));
+
+         for (int n = 0; n < 2; n++) {
+            unsigned fixed_mask = 0;
+            if (mask & WRITEMASK_X)
+               fixed_mask |= WRITEMASK_XY;
+            if (mask & WRITEMASK_Y)
+               fixed_mask |= WRITEMASK_ZW;
+            emit_urb_write(shuffled_float, fixed_mask,
+                           imm_offset, indirect_offset);
+
+            shuffled_float = byte_offset(shuffled_float, REG_SIZE);
+            mask >>= 2;
+            imm_offset++;
+         }
+      } else {
+         emit_urb_write(swizzle(value, swiz), mask,
+                        imm_offset, indirect_offset);
+      }
       break;
    }