SliderFloat() fast-path when power=1.0f (no powf() calls) also makes code easier to read

imgui.cpp

@@ -4763,6 +4763,7 @@ bool ImGui::SliderFloat(const char* label, float* v, float v_min, float v_max, c
     const bool tab_focus_requested = window->FocusItemRegister(g.ActiveId == id);
 
     const bool is_unbound = v_min == -FLT_MAX || v_min == FLT_MAX || v_max == -FLT_MAX || v_max == FLT_MAX;
+    const bool is_logarithmic = abs(power - 1.0f) > 0.0001f;
 
     const float grab_size_in_units = 1.0f;                                                              // In 'v' units. Probably needs to be parametrized, based on a 'v_step' value? decimal precision?
     float grab_size_in_pixels;
@@ -4830,11 +4831,10 @@ bool ImGui::SliderFloat(const char* label, float* v, float v_min, float v_max, c
             {
                 const float normalized_pos = ImClamp((g.IO.MousePos.x - slider_effective_x1) / slider_effective_w, 0.0f, 1.0f);
                 
-                // Linear slider
-                //float new_value = ImLerp(v_min, v_max, normalized_pos);
-
-                // Account for logarithmic scale on both sides of the zero
                 float new_value;
+                if (is_logarithmic)
+                {
+                    // Account for logarithmic scale on both sides of the zero
                     if (normalized_pos < linear_zero_pos)
                     {
                         // Negative: rescale to the negative range before powering
@@ -4853,6 +4853,12 @@ bool ImGui::SliderFloat(const char* label, float* v, float v_min, float v_max, c
                         a = powf(a, power);
                         new_value = ImLerp(ImMax(v_min,0.0f), v_max, a);
                     }
+                }
+                else
+                {
+                    // Linear slider
+                    new_value = ImLerp(v_min, v_max, normalized_pos);
+                }
 
                 // Round past decimal precision
                 //    0->1, 1->0.1, 2->0.01, etc.
@@ -4879,11 +4885,10 @@ bool ImGui::SliderFloat(const char* label, float* v, float v_min, float v_max, c
 
     if (!is_unbound)
     {
-        // Linear slider
-        // const float grab_t = (ImClamp(*v, v_min, v_max) - v_min) / (v_max - v_min);
-
         // Calculate slider grab positioning
         float grab_t;
+        if (is_logarithmic)
+        {
             float v_clamped = ImClamp(*v, v_min, v_max);
             if (v_clamped < 0.0f)
             {
@@ -4895,6 +4900,12 @@ bool ImGui::SliderFloat(const char* label, float* v, float v_min, float v_max, c
                 const float f = (v_clamped - ImMax(0.0f,v_min)) / (v_max - ImMax(0.0f,v_min));
                 grab_t = linear_zero_pos + powf(f, 1.0f/power) * (1.0f - linear_zero_pos);
             }
+        }
+        else
+        {
+            // Linear slider
+            grab_t = (ImClamp(*v, v_min, v_max) - v_min) / (v_max - v_min);
+        }
 
         // Draw
         const float grab_x = ImLerp(slider_effective_x1, slider_effective_x2, grab_t);