From a1f1681ce73d6ace1e5b7b6f426d945683feb154 Mon Sep 17 00:00:00 2001
From: JuiceyDev <me@juicey.dev>
Date: Thu, 5 Mar 2026 14:02:05 +0100
Subject: [PATCH] Starting IGGY impl

---
 Minecraft.Client/Build/CMakeLists.txt         |  2 +
 .../Platform/Linux/Linux_UIController.cpp     | 80 ++++++++++++++++++-
 .../Platform/Linux/Stubs/iggy_stubs.h         | 27 +++++++
 3 files changed, 105 insertions(+), 4 deletions(-)

diff --git a/Minecraft.Client/Build/CMakeLists.txt b/Minecraft.Client/Build/CMakeLists.txt
index f1824aeac..e2ed67a27 100644
--- a/Minecraft.Client/Build/CMakeLists.txt
+++ b/Minecraft.Client/Build/CMakeLists.txt
@@ -1106,6 +1106,8 @@ set(Linux
     "../Platform/Linux/Linux_App.cpp"
     "../Platform/Linux/LinuxGL.cpp"
     "../Platform/Linux/linux_game_stubs.cpp"
+    "../Platform/Linux/Iggy/gdraw/gdraw_glfw.c"
+    "../Platform/Linux/Iggy/gdraw/gdraw_glfw.h"
 )
 source_group("Linux" FILES ${Linux})
 
diff --git a/Minecraft.Client/Platform/Linux/Linux_UIController.cpp b/Minecraft.Client/Platform/Linux/Linux_UIController.cpp
index 4935914f6..fb6e8b40e 100644
--- a/Minecraft.Client/Platform/Linux/Linux_UIController.cpp
+++ b/Minecraft.Client/Platform/Linux/Linux_UIController.cpp
@@ -1,6 +1,13 @@
 #include "../../../Minecraft.World/Build/stdafx.h"
 #include "Linux_UIController.h"
 
+// Temp
+#include "../../Minecraft.h"
+#include "../../Textures/Textures.h"
+
+// GDraw GL backend for Linux
+#include "Iggy/gdraw/gdraw_glfw.h"
+
 #define _ENABLEIGGY
 
 ConsoleUIController ui;
@@ -9,46 +16,111 @@ void ConsoleUIController::init(S32 w, S32 h)
 {
 #ifdef _ENABLEIGGY
 	// Shared init
-	preInit(w,h);
+	preInit(w, h);
+
+	//init
+	gdraw_funcs = gdraw_GL_CreateContext(w, h, 0);
+
+	if (!gdraw_funcs)
+	{
+		app.DebugPrintf("Failed to initialise GDraw GL!\n");
+		fprintf(stderr, "[Linux_UIController] Failed to initialise GDraw GL!\n");
+		// nott fatal for now
+	}
+	else
+	{
+
+		gdraw_GL_SetResourceLimits(GDRAW_GL_RESOURCE_vertexbuffer, 5000, 16 * 1024 * 1024);
+		gdraw_GL_SetResourceLimits(GDRAW_GL_RESOURCE_texture, 5000, 128 * 1024 * 1024);
+		gdraw_GL_SetResourceLimits(GDRAW_GL_RESOURCE_rendertarget, 10, 32 * 1024 * 1024);
+
+		IggySetGDraw(gdraw_funcs);
+	}
+
 	postInit();
 #endif
 }
 
 void ConsoleUIController::render()
 {
+#ifdef _ENABLEIGGY
+	if (!gdraw_funcs)
+		return;
+
+	gdraw_GL_SetTileOrigin(0, 0, 0);
+
+	// render 
+	renderScenes();
+
+	gdraw_GL_NoMoreGDrawThisFrame();
+#endif
 }
 
 void ConsoleUIController::beginIggyCustomDraw4J(IggyCustomDrawCallbackRegion *region, CustomDrawData *customDrawRegion)
-{
+
+	gdraw_GL_BeginCustomDraw_4J(region, customDrawRegion->mat);
 }
 
 CustomDrawData *ConsoleUIController::setupCustomDraw(UIScene *scene, IggyCustomDrawCallbackRegion *region)
 {
-    return nullptr;
+	CustomDrawData *customDrawRegion = new CustomDrawData();
+	customDrawRegion->x0 = region->x0;
+	customDrawRegion->x1 = region->x1;
+	customDrawRegion->y0 = region->y0;
+	customDrawRegion->y1 = region->y1;
+
+	
+	gdraw_GL_BeginCustomDraw_4J(region, customDrawRegion->mat);
+
+	setupCustomDrawGameStateAndMatrices(scene, customDrawRegion);
+
+	return customDrawRegion;
 }
 
 CustomDrawData *ConsoleUIController::calculateCustomDraw(IggyCustomDrawCallbackRegion *region)
 {
-	return nullptr;
+	CustomDrawData *customDrawRegion = new CustomDrawData();
+	customDrawRegion->x0 = region->x0;
+	customDrawRegion->x1 = region->x1;
+	customDrawRegion->y0 = region->y0;
+	customDrawRegion->y1 = region->y1;
+
+	gdraw_GL_CalculateCustomDraw_4J(region, customDrawRegion->mat);
+
+	return customDrawRegion;
 }
 
 void ConsoleUIController::endCustomDraw(IggyCustomDrawCallbackRegion *region)
 {
+	endCustomDrawGameStateAndMatrices();
+
+	gdraw_GL_EndCustomDraw(region);
 }
 
 void ConsoleUIController::setTileOrigin(S32 xPos, S32 yPos)
 {
+	gdraw_GL_SetTileOrigin(xPos, yPos, 0);
 }
 
 GDrawTexture *ConsoleUIController::getSubstitutionTexture(int textureId)
 {
+	// todo impl
 	return nullptr;
 }
 
 void ConsoleUIController::destroySubstitutionTexture(void *destroyCallBackData, GDrawTexture *handle)
 {
+	if (handle)
+		gdraw_GL_WrappedTextureDestroy(handle);
 }
 
 void ConsoleUIController::shutdown()
 {
+#ifdef _ENABLEIGGY
+	if (gdraw_funcs)
+	{
+		gdraw_GL_DestroyContext();
+		gdraw_funcs = nullptr;
+	}
+#endif
 }
\ No newline at end of file
diff --git a/Minecraft.Client/Platform/Linux/Stubs/iggy_stubs.h b/Minecraft.Client/Platform/Linux/Stubs/iggy_stubs.h
index 8f9232f82..532c4b265 100644
--- a/Minecraft.Client/Platform/Linux/Stubs/iggy_stubs.h
+++ b/Minecraft.Client/Platform/Linux/Stubs/iggy_stubs.h
@@ -159,4 +159,31 @@ RADEXPFUNC inline void RADEXPLINK IggyLibraryDestroy(IggyLibrary lib) {
   STUBBED;
 }
 
+// Iggy is fake
+static GDrawFunctions *s_iggy_gdraw_funcs = 0;
+RADEXPFUNC inline void RADEXPLINK IggySetGDraw(GDrawFunctions *gdraw_funcs) {
+  s_iggy_gdraw_funcs = gdraw_funcs;
+}
+
+// Audio stubs
+RADEXPFUNC inline void RADEXPLINK IggyAudioUseDefault(void) {
+  STUBBED;
+}
+
+// Explorer/Perfmon, shit implmentation
+RADEXPFUNC inline void * RADEXPLINK IggyExpCreate(const char *host, int port, void *storage, int storage_size) {
+  STUBBED;
+  return 0;
+}
+RADEXPFUNC inline void RADEXPLINK IggyUseExplorer(Iggy *player, void *explorer) {
+  STUBBED;
+}
+RADEXPFUNC inline void * RADEXPLINK IggyPerfmonCreate(void *(*alloc_func)(unsigned long), void (*free_func)(void *), void *user) {
+  STUBBED;
+  return 0;
+}
+RADEXPFUNC inline void RADEXPLINK IggyInstallPerfmon(void *perfmon) {
+  STUBBED;
+}
+
 #endif // IGGYSTUBS_H
\ No newline at end of file