add lut exp to driver

1 files changed, 27 insertions, 2 deletions

diff --git a/driver/driver.cpp b/driver/driver.cpp
index fb47477..4dd3d62 100644
--- a/driver/driver.cpp
+++ b/driver/driver.cpp
@@ -12,11 +12,13 @@
 namespace ra = rawaccel;
 
 using milliseconds = double;
+using lut_value_t = ra::si_pair;
 
 struct {
     ra::settings args;
     milliseconds tick_interval = 0; // set in DriverEntry
     ra::mouse_modifier modifier;
+    vec2<lut_value_t*> lookups = {};
 } global;
 
 VOID
@@ -168,8 +170,14 @@ Return Value:
             return;
         }
 
-        global.args = *reinterpret_cast<ra::settings*>(buffer);
-        global.modifier = { global.args };
+        ra::settings new_settings = *reinterpret_cast<ra::settings*>(buffer);
+
+        if (new_settings.time_min <= 0 || _isnanf(new_settings.time_min)) {
+            new_settings.time_min = ra::settings{}.time_min;
+        }
+
+        global.args = new_settings;
+        global.modifier = { global.args, global.lookups };
 
         WdfRequestComplete(Request, STATUS_SUCCESS);
     }
@@ -251,6 +259,23 @@ Routine Description:
         KeQueryPerformanceCounter(&freq);
         global.tick_interval = 1e3 / freq.QuadPart;
 
+        auto make_lut = [] {
+            const size_t POOL_SIZE = sizeof(lut_value_t) * ra::LUT_SIZE;
+
+            auto pool = ExAllocatePoolWithTag(NonPagedPool, POOL_SIZE, 'AR');
+
+            if (!pool) {
+                DebugPrint(("RA - failed to allocate LUT\n"));
+            }
+            else {
+                RtlZeroMemory(pool, POOL_SIZE);
+            }
+
+            return reinterpret_cast<lut_value_t*>(pool);
+        };
+
+        global.lookups = { make_lut(), make_lut() };
+
         CreateControlDevice(driver);
     }
     else {