From 6dfc5ea9ef6314c997368011cd67a0115d396fa5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Henrik=20Rydg=C3=A5rd?= <hrydgard@gmail.com>
Date: Fri, 22 Nov 2024 13:54:19 +0100
Subject: [PATCH] ImGui: Add TTF font support

We use the Roboto font that we're already shipping for now, although, we could
also support other fonts or have a setting.
---
 UI/EmuScreen.cpp                | 10 ++++++++--
 UI/ImDebugger/ImDebugger.cpp    |  7 ++++++-
 UI/ImDebugger/ImDebugger.h      |  1 +
 ext/imgui/imgui_impl_thin3d.cpp | 10 +++++++++-
 ext/imgui/imgui_impl_thin3d.h   |  4 ++--
 5 files changed, 26 insertions(+), 6 deletions(-)

diff --git a/UI/EmuScreen.cpp b/UI/EmuScreen.cpp
index 2fbb02f8b1..5c6d8372ef 100644
--- a/UI/EmuScreen.cpp
+++ b/UI/EmuScreen.cpp
@@ -27,7 +27,7 @@ using namespace std::placeholders;
 #include "Common/Render/Text/draw_text.h"
 #include "Common/File/FileUtil.h"
 #include "Common/Battery/Battery.h"
-
+#include "Common/File/VFS/VFS.h"
 #include "Common/UI/Root.h"
 #include "Common/UI/UI.h"
 #include "Common/UI/Context.h"
@@ -1646,7 +1646,13 @@ void EmuScreen::renderImDebugger() {
 		if (!imguiInited_) {
 			imguiInited_ = true;
 			imDebugger_ = std::make_unique<ImDebugger>();
-			ImGui_ImplThin3d_Init(draw);
+
+			// Read the TTF font
+			size_t size = 0;
+			uint8_t *fontData = g_VFS.ReadFile("Roboto-Condensed.ttf", &size);
+			// This call works even if fontData is nullptr, in which case the font just won't get loaded.
+			// This takes ownership of the font array.
+			ImGui_ImplThin3d_Init(draw, fontData, size);
 		}
 
 		if (PSP_IsInited()) {
diff --git a/UI/ImDebugger/ImDebugger.cpp b/UI/ImDebugger/ImDebugger.cpp
index 022ec93b24..f587b37ca6 100644
--- a/UI/ImDebugger/ImDebugger.cpp
+++ b/UI/ImDebugger/ImDebugger.cpp
@@ -399,7 +399,8 @@ void ImDebugger::Frame(MIPSDebugInterface *mipsDebug, GPUDebugInterface *gpuDebu
 			if (ImGui::MenuItem("Close Debugger")) {
 				g_Config.bShowImDebugger = false;
 			}
-			ImGui::MenuItem("Dear ImGUI Demo", nullptr, &cfg_.demoOpen);
+			ImGui::MenuItem("Dear ImGui Demo", nullptr, &cfg_.demoOpen);
+			ImGui::MenuItem("Dear ImGui Style editor", nullptr, &cfg_.styleEditorOpen);
 			ImGui::EndMenu();
 		}
 		ImGui::EndMainMenuBar();
@@ -409,6 +410,10 @@ void ImDebugger::Frame(MIPSDebugInterface *mipsDebug, GPUDebugInterface *gpuDebu
 		ImGui::ShowDemoWindow(&cfg_.demoOpen);
 	}
 
+	if (cfg_.styleEditorOpen) {
+		ImGui::ShowStyleEditor();
+	}
+
 	if (cfg_.disasmOpen) {
 		disasm_.Draw(mipsDebug, &cfg_.disasmOpen, coreState);
 	}
diff --git a/UI/ImDebugger/ImDebugger.h b/UI/ImDebugger/ImDebugger.h
index 75aa976612..8d3368d1d6 100644
--- a/UI/ImDebugger/ImDebugger.h
+++ b/UI/ImDebugger/ImDebugger.h
@@ -65,6 +65,7 @@ struct ImConfig {
 	bool atracOpen = true;
 	bool structViewerOpen = false;
 	bool framebuffersOpen = false;
+	bool styleEditorOpen = false;
 
 	// HLE explorer settings
 	// bool filterByUsed = true;
diff --git a/ext/imgui/imgui_impl_thin3d.cpp b/ext/imgui/imgui_impl_thin3d.cpp
index c4f9c888cf..aa935d4ecb 100644
--- a/ext/imgui/imgui_impl_thin3d.cpp
+++ b/ext/imgui/imgui_impl_thin3d.cpp
@@ -217,8 +217,16 @@ void ImGui_ImplThin3d_DestroyDeviceObjects() {
 	}
 }
 
-bool ImGui_ImplThin3d_Init(Draw::DrawContext *draw) {
+bool ImGui_ImplThin3d_Init(Draw::DrawContext *draw, const uint8_t *ttf_font, size_t size) {
 	ImGuiIO& io = ImGui::GetIO();
+	if (ttf_font) {
+		io.Fonts->AddFontFromMemoryTTF((void *)ttf_font, size, 18.0f * g_display.dpi_scale_x, nullptr, io.Fonts->GetGlyphRangesDefault());
+	} else {
+		// necessary?
+		io.Fonts->AddFontDefault();
+	}
+	ImGui::GetStyle().ScaleAllSizes(g_display.dpi_scale_x);
+
 	IMGUI_CHECKVERSION();
 	IM_ASSERT(io.BackendRendererUserData == nullptr && "Already initialized a renderer backend!");
 
diff --git a/ext/imgui/imgui_impl_thin3d.h b/ext/imgui/imgui_impl_thin3d.h
index c06090d35c..697d12b3aa 100644
--- a/ext/imgui/imgui_impl_thin3d.h
+++ b/ext/imgui/imgui_impl_thin3d.h
@@ -33,8 +33,8 @@
 #include "Common/GPU/thin3d.h"
 #include "Common/Math/lin/matrix4x4.h"
 
-// Called by user code
-IMGUI_IMPL_API bool         ImGui_ImplThin3d_Init(Draw::DrawContext *draw);
+// Called by user code. Takes ownership of the font buffer and later deletes it.
+IMGUI_IMPL_API bool         ImGui_ImplThin3d_Init(Draw::DrawContext *draw, const uint8_t *ttf_font, size_t size);
 IMGUI_IMPL_API void         ImGui_ImplThin3d_Shutdown();
 IMGUI_IMPL_API void         ImGui_ImplThin3d_NewFrame(Draw::DrawContext *draw, Lin::Matrix4x4 drawMatrix);
 IMGUI_IMPL_API void         ImGui_ImplThin3d_RenderDrawData(ImDrawData* draw_data, Draw::DrawContext *draw);