platform/wavelet3d: implement shader cores

This commit contains over a month of intermittent work (I don't have
enough free time to do this the right way)

1 files changed, 20 insertions, 0 deletions

diff --git a/platform/wavelet3d/gfx_skid_buf.sv b/platform/wavelet3d/gfx_skid_buf.sv
new file mode 100644
index 0000000..e3e5247
--- /dev/null
+++ b/platform/wavelet3d/gfx_skid_buf.sv
@@ -0,0 +1,20 @@
+module gfx_skid_buf
+#(int WIDTH = 0)
+(
+	input  logic              clk,
+
+	input  logic[WIDTH - 1:0] in,
+	input  logic              stall,
+
+	output logic[WIDTH - 1:0] out
+);
+
+	logic[WIDTH - 1:0] skid;
+
+	assign out = stall ? skid : in;
+
+	always_ff @(posedge clk)
+		if (~stall)
+			skid <= in;
+
+endmodule