Backends: SDL: Removed SDL_MOUSEWHEEL value clamping. (#4019, #6096, #6081)

+ Fix warnings.

backends/imgui_impl_opengl3.cpp

@@ -107,12 +107,13 @@
 // Clang warnings with -Weverything
 #if defined(__clang__)
 #pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wold-style-cast"     // warning: use of old-style cast
+#pragma clang diagnostic ignored "-Wold-style-cast"         // warning: use of old-style cast
-#pragma clang diagnostic ignored "-Wsign-conversion"    // warning: implicit conversion changes signedness
+#pragma clang diagnostic ignored "-Wsign-conversion"        // warning: implicit conversion changes signedness
 #endif
 #if defined(__GNUC__)
 #pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wcast-function-type"   // warning: cast between incompatible function types
+#pragma GCC diagnostic ignored "-Wunknown-warning-option"   // warning: unknown warning group 'xxx'
+#pragma GCC diagnostic ignored "-Wcast-function-type"       // warning: cast between incompatible function types
 #endif
 
 // GL includes

backends/imgui_impl_sdl.cpp

@@ -18,6 +18,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2023-02-02: Removed SDL_MOUSEWHEEL value clamping, as values seem correct in latest Emscripten. (#4019)
 //  2023-02-01: Flipping SDL_MOUSEWHEEL 'wheel.x' value to match other backends and offer consistent horizontal scrolling direction. (#4019, #6096, #1463)
 //  2022-10-11: Using 'nullptr' instead of 'NULL' as per our switch to C++11.
 //  2022-09-26: Inputs: Disable SDL 2.0.22 new "auto capture" (SDL_HINT_MOUSE_AUTO_CAPTURE) which prevents drag and drop across windows for multi-viewport support + don't capture when drag and dropping. (#5710)
@@ -261,8 +262,8 @@ bool ImGui_ImplSDL2_ProcessEvent(const SDL_Event* event)
         }
         case SDL_MOUSEWHEEL:
         {
-            float wheel_x = (event->wheel.x < 0) ? 1.0f : (event->wheel.x > 0) ? -1.0f : 0.0f; // About the clamping and flipped axis: see #4019
+            float wheel_x = -(float)event->wheel.x;
-            float wheel_y = (event->wheel.y > 0) ? 1.0f : (event->wheel.y < 0) ? -1.0f : 0.0f;
+            float wheel_y = (float)event->wheel.y;
             io.AddMouseWheelEvent(wheel_x, wheel_y);
             return true;
         }

docs/CHANGELOG.txt

@@ -91,6 +91,8 @@ All changes:
   can exacerbate that. (#6114, #3644)
 - Backends: OSX: Fixed scroll/wheel scaling for devices emitting events with
   hasPreciseScrollingDeltas==false (e.g. non-Apple mices).
+- Backends: SDL: Removed SDL_MOUSEWHEEL value clamping. (#4019, #6096, #6081)
+  Latest Emscripten seems to emit correct values.
 - Backend: WebGPU: Fix building for latest WebGPU specs (remove implicit layout generation).
   (#6117, #4116, #3632) [@tonygrue, @bfierz]
 - Examples: Win32: Fixed examples using RegisterClassW() since 1.89 to also call