minor update

hw/rtl/libs/VX_sat_fx.v

@@ -0,0 +1,21 @@
+`include "VX_platform.vh"
+
+module VX_sat_fx #(
+    parameter IN_W  = 1,
+    parameter OUT_W = 1,
+    parameter MODEL = 1
+) (
+    input wire [IN_W-1:0] data_in,   
+    output wire [OUT_W-1:0] data_out
+); 
+    `STATIC_ASSERT(((OUT_W+1) < IN_W), ("invalid parameter"))
+
+    if (MODEL == 1) begin
+        assign data_out = data_in[IN_W-1] ? OUT_W'(0) : ((data_in > {OUT_W{1'b1}}) ? {OUT_W{1'b1}} : OUT_W'(data_in));
+    end else begin
+        wire [OUT_W-1:0] underflow_mask = {OUT_W{~data_in[IN_W-1]}};        
+        wire [OUT_W-1:0] overflow_mask = {OUT_W{(| data_in[IN_W-2:OUT_W])}};
+        assign data_out = (data_in[OUT_W-1:0] | overflow_mask) & underflow_mask;
+    end
+
+endmodule

hw/rtl/tex_unit/VX_tex_define.vh

@@ -9,8 +9,6 @@
 `define FIXED_HALF      (`FIXED_ONE >> 1)
 `define FIXED_MASK      (`FIXED_ONE - 1)
 
-`define CLAMP(x,lo,hi)  (($signed(x) < $signed(lo)) ? lo : ((x > hi) ? hi : x))
-
 `define TEX_ADDR_BITS       32
 `define TEX_FORMAT_BITS     3
 `define TEX_WRAP_BITS       2

hw/rtl/tex_unit/VX_tex_wrap.v

@@ -12,14 +12,20 @@ module VX_tex_wrap #(
 
     reg [`FIXED_FRAC-1:0] coord_r;
 
-    wire [31:0] clamp = `CLAMP(coord_i, 0, `FIXED_MASK);
+    wire [`FIXED_FRAC-1:0] clamp;
 
-    `UNUSED_VAR (clamp)
+    VX_sat_fx #(
+        .IN_W  (32),
+        .OUT_W (`FIXED_FRAC)
+    ) sat_fx (
+        .data_in  (coord_i),
+        .data_out (clamp)
+    );
 
     always @(*) begin
         case (wrap_i)
             `TEX_WRAP_CLAMP:   
-                coord_r = clamp[`FIXED_FRAC-1:0];
+                coord_r = clamp;
             `TEX_WRAP_MIRROR: 
                 coord_r = coord_i[`FIXED_FRAC-1:0] ^ {`FIXED_FRAC{coord_i[`FIXED_FRAC]}};
             default: //`TEX_WRAP_REPEAT