Allow window scaling override from within PoB

Extends the scaling feature with the ability to set the scaling value from within PoB and also have it update in real-time when a user changes the option so they don't need to restart the app

Author: LocalIdentity

engine/render.h

@@ -102,6 +102,8 @@ class r_IRenderer {
 	virtual int		VirtualScreenWidth() = 0;
 	virtual int		VirtualScreenHeight() = 0;
 	virtual float	VirtualScreenScaleFactor() = 0;
+	virtual void	SetDpiScaleOverridePercent(int percent) = 0;
+	virtual int		DpiScaleOverridePercent() const = 0;
 	virtual int		VirtualMap(int properValue) = 0;
 	virtual int		VirtualUnmap(int mappedValue) = 0;
 

engine/render/r_main.cpp

@@ -1863,11 +1863,25 @@ int r_renderer_c::VirtualScreenHeight() {
 
 float r_renderer_c::VirtualScreenScaleFactor() {
 	if (apiDpiAware) {
+		if (dpiScaleOverridePercent > 0) {
+			return (float)dpiScaleOverridePercent / 100.0f;
+		}
 		return sys->video->vid.dpiScale;
 	}
 	return 1.0f;
 }
 
+void r_renderer_c::SetDpiScaleOverridePercent(int percent) {
+	if (percent < 0) {
+		percent = 0;
+	}
+	dpiScaleOverridePercent = percent;
+}
+
+int r_renderer_c::DpiScaleOverridePercent() const {
+	return dpiScaleOverridePercent;
+}
+
 int r_renderer_c::VirtualMap(int properValue) {
 	if (apiDpiAware) {
 		return properValue;

engine/render/r_main.h

@@ -99,6 +99,8 @@ class r_renderer_c: public r_IRenderer, public conCmdHandler_c {
 	int		VirtualScreenWidth();
 	int		VirtualScreenHeight();
 	float	VirtualScreenScaleFactor();
+	void	SetDpiScaleOverridePercent(int percent);
+	int		DpiScaleOverridePercent() const;
 	int		VirtualMap(int properValue);
 	int		VirtualUnmap(int mappedValue);
 
@@ -126,7 +128,7 @@ class r_renderer_c: public r_IRenderer, public conCmdHandler_c {
 	PFNGLINSERTEVENTMARKEREXTPROC	glInsertEventMarkerEXT = nullptr;
 	PFNGLPUSHGROUPMARKEREXTPROC		glPushGroupMarkerEXT = nullptr;
 	PFNGLPOPGROUPMARKEREXTPROC		glPopGroupMarkerEXT = nullptr;
-	
+
 	conVar_c*	r_compress = nullptr;
 	conVar_c*	r_screenshotFormat = nullptr;
 	conVar_c*	r_layerDebug = nullptr;
@@ -173,6 +175,7 @@ class r_renderer_c: public r_IRenderer, public conCmdHandler_c {
 	};
 
 	bool apiDpiAware{};
+	int dpiScaleOverridePercent = 0;
 	RenderTarget rttMain[2];
 	int	presentRtt = 0;
 

ui_api.cpp

@@ -1132,6 +1132,26 @@ static int l_DrawStringCursorIndex(lua_State* L)
 	return 1;
 }
 
+static int l_SetDPIScaleOverridePercent(lua_State* L)
+{
+	ui_main_c* ui = GetUIPtr(L);
+	ui->LAssert(L, ui->renderer != NULL, "Renderer is not initialised");
+	int n = lua_gettop(L);
+	ui->LAssert(L, n >= 1, "Usage: SetDPIScaleOverridePercent(percent)");
+	ui->LAssert(L, lua_isnumber(L, 1), "SetDPIScaleOverridePercent() argument 1: expected number, got %s", luaL_typename(L, 1));
+	int percent = (int)lua_tointeger(L, 1);
+	ui->renderer->SetDpiScaleOverridePercent(percent);
+	return 0;
+}
+
+static int l_GetDPIScaleOverridePercent(lua_State* L)
+{
+	ui_main_c* ui = GetUIPtr(L);
+	ui->LAssert(L, ui->renderer != NULL, "Renderer is not initialised");
+	lua_pushinteger(L, ui->renderer->DpiScaleOverridePercent());
+	return 1;
+}
+
 static int l_StripEscapes(lua_State* L)
 {
 	ui_main_c* ui = GetUIPtr(L);
@@ -2146,6 +2166,8 @@ int ui_main_c::InitAPI(lua_State* L)
 	ADDFUNC(SetViewport);
 	ADDFUNC(SetBlendMode);
 	ADDFUNC(SetDrawColor);
+	ADDFUNC(SetDPIScaleOverridePercent);
+	ADDFUNC(GetDPIScaleOverridePercent);
 	ADDFUNC(DrawImage);
 	ADDFUNC(DrawImageQuad);
 	ADDFUNC(DrawString);