Moved IMGUI_FONT_TEX_UV_FOR_WHITE define to a variable so font can be changed at runtime

imgui.cpp

@@ -105,7 +105,7 @@
 
  - if you want to use a different font than the default
    - create bitmap font data using BMFont. allocate ImGui::GetIO().Font and use ->LoadFromFile()/LoadFromMemory(), set ImGui::GetIO().FontHeight
-   - load your texture yourself. texture *MUST* have white pixel at UV coordinate 'IMGUI_FONT_TEX_UV_FOR_WHITE' (you can #define it in imconfig.h), this is used by solid objects.
+   - load your texture yourself. texture *MUST* have white pixel at UV coordinate Imgui::GetIO().FontTexUvForWhite. This is used to draw all solid shapes.
 
  - tip: the construct 'if (IMGUI_ONCE_UPON_A_FRAME)' will evaluate to true only once a frame, you can use it to add custom UI in the middle of a deep nested inner loop in your code.
  - tip: you can call Render() multiple times (e.g for VR renders), up to you to communicate the extra state to your RenderDrawListFn function.
@@ -279,6 +279,7 @@ ImGuiIO::ImGuiIO()
     IniFilename = "imgui.ini";
     LogFilename = "imgui_log.txt";
     Font = NULL;
+    FontTexUvForWhite = ImVec2(0.0f,0.0f);
     FontAllowScaling = false;
     PixelCenterOffset = 0.0f;
     MousePos = ImVec2(-1,-1);
@@ -4812,7 +4813,7 @@ void ImDrawList::AddVtx(const ImVec2& pos, ImU32 col)
 {
     vtx_write->pos = pos;
     vtx_write->col = col;
-    vtx_write->uv = IMGUI_FONT_TEX_UV_FOR_WHITE;
+    vtx_write->uv = GImGui.IO.FontTexUvForWhite;
     vtx_write++;
 }
 

imgui.h

@@ -390,6 +390,7 @@ struct ImGuiIO
     int         KeyMap[ImGuiKey_COUNT];     // <unset>                  // Map of indices into the KeysDown[512] entries array
     ImFont      Font;                       // <auto>                   // Gets passed to text functions. Typedef ImFont to the type you want (ImBitmapFont* or your own font).
     float       FontHeight;                 // <auto>                   // Default font height, must be the vertical distance between two lines of text, aka == CalcTextSize(" ").y
+    ImVec2      FontTexUvForWhite;          // = (0.0f,0.0f)            // Font texture must have a white pixel at this UV coordinate. Adjust if you are using custom texture.
     bool        FontAllowScaling;           // = false                  // Set to allow scaling text with CTRL+Wheel.
     float       PixelCenterOffset;          // = 0.0f                   // Try to set to 0.5f or 0.375f if rendering is blurry
 
@@ -524,10 +525,6 @@ struct ImDrawCmd
     ImVec4          clip_rect;
 };
 
-#ifndef IMGUI_FONT_TEX_UV_FOR_WHITE
-#define IMGUI_FONT_TEX_UV_FOR_WHITE ImVec2(0.f,0.f)
-#endif
-
 // sizeof() == 20
 struct ImDrawVert
 {