debug: scan all peripherals to find GPU name

programs/roulette.lua

@@ -20,7 +20,21 @@ local tris = {
     { 1.0, 0.0, 1.0,    0.0, 0.0, 0.0,    1.0, 0.0, 0.0 },
 }
 
-local gpu = peripheral.wrap("tm_gpu_0")
+print("Scanning peripherals...")
+for _, name in ipairs(peripheral.getNames()) do
+    print(name .. " = " .. peripheral.getType(name))
+end
+
+local gpu
+for _, name in ipairs(peripheral.getNames()) do
+    local t = peripheral.getType(name)
+    if t and t:find("gpu") then
+        gpu = peripheral.wrap(name)
+        print("Found GPU: " .. name)
+        break
+    end
+end
+if not gpu then error("No GPU peripheral found.") end
 gpu.refreshSize()
 gpu.setSize(64)
 local pw, ph, bx, by, sb = gpu.getSize()