many fixes

hw/rtl/tex_unit/VX_tex_stride.v

@@ -0,0 +1,27 @@
+`include "VX_tex_define.vh"
+
+module VX_tex_stride #(
+    parameter CORE_ID = 0
+) (
+    input wire [`TEX_FORMAT_BITS-1:0]  format,
+    output wire [`TEX_STRIDE_BITS-1:0] log_stride
+);  
+    `UNUSED_PARAM (CORE_ID)
+
+    reg [`TEX_STRIDE_BITS-1:0] log_stride_r;  
+
+    always @(*) begin
+        case (format)
+            `TEX_FORMAT_A8:       log_stride_r = 0;
+            `TEX_FORMAT_L8:       log_stride_r = 0;
+            `TEX_FORMAT_L8A8:     log_stride_r = 1;
+            `TEX_FORMAT_R5G6B5:   log_stride_r = 1;
+            `TEX_FORMAT_R4G4B4A4: log_stride_r = 1;
+            // `TEX_FORMAT_R8G8B8A8
+            default:              log_stride_r = 2;
+        endcase
+    end
+
+    assign log_stride = log_stride_r;
+
+endmodule