Add imgui, keyboard mixin

kotlin-graphics/imgui#114

build.gradle

@@ -13,17 +13,24 @@ group = project.maven_group
 minecraft {
 }
 
+repositories {
+	mavenCentral()
+	maven {
+		name = "jitpack.io"
+		url = "https://jitpack.io"
+	}
+}
+
 dependencies {
 	//to change the versions see the gradle.properties file
 	minecraft "com.mojang:minecraft:${project.minecraft_version}"
 	mappings "net.fabricmc:yarn:${project.yarn_mappings}:v2"
 	modCompile "net.fabricmc:fabric-loader:${project.loader_version}"
 
-	// Fabric API. This is technically optional, but you probably want it anyway.
-	modCompile "net.fabricmc.fabric-api:fabric-api:${project.fabric_version}"
-
-	// PSA: Some older mods, compiled on Loom 0.2.1, might have outdated Maven POMs.
-	// You may need to force-disable transitiveness on them.
+	compile "com.github.kotlin-graphics:imgui:-SNAPSHOT"
+	compile 'com.github.kotlin-graphics:uno-sdk:f528113bf45e43406953d6881915467d85a20881'
+	compile 'com.github.kotlin-graphics.glm:glm:1b4ac18dd1a3c23440d3f33596688aac60bc0141'
+	compile group: 'org.jetbrains.kotlin', name: 'kotlin-stdlib', version: '1.3.61'
 }
 
 processResources {

src/main/java/net/fabricmc/example/ExampleMod.java

@@ -3,12 +3,12 @@
 import net.fabricmc.api.ModInitializer;
 
 public class ExampleMod implements ModInitializer {
+
+	public static ImguiScreen imguiScreen;
+
 	@Override
 	public void onInitialize() {
-		// This code runs as soon as Minecraft is in a mod-load-ready state.
-		// However, some things (like resources) may still be uninitialized.
-		// Proceed with mild caution.
-
-		System.out.println("Hello Fabric world!");
+		System.out.println("Hello imgui!");
 	}
+
 }

src/main/java/net/fabricmc/example/ImguiScreen.java

@@ -0,0 +1,62 @@
+package net.fabricmc.example;
+
+import glm_.vec2.Vec2;
+import imgui.ImGui;
+import imgui.ImguiKt;
+import imgui.classes.Context;
+import imgui.impl.gl.ImplGL3;
+import imgui.impl.glfw.ImplGlfw;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.gui.screen.Screen;
+import net.minecraft.text.LiteralText;
+import uno.glfw.GlfwWindow;
+
+public class ImguiScreen extends Screen {
+
+    private ImGui imgui = ImGui.INSTANCE;
+
+    private ImplGL3 implGl3;
+    private ImplGlfw implGlfw;
+
+    private boolean[] showDemoWindow = new boolean[] { false };
+
+    public ImguiScreen() {
+        super(new LiteralText("ImGUI Minecraft Screen"));
+        setup();
+    }
+
+    private void setup() {
+        ImguiKt.MINECRAFT_BEHAVIORS = true;
+        GlfwWindow window = GlfwWindow.from(MinecraftClient.getInstance().getWindow().getHandle());
+        window.makeContextCurrent();
+        new Context();
+        implGlfw = new ImplGlfw(window, false, null);
+        implGl3 = new ImplGL3();
+    }
+
+    public void reload() {
+        implGl3 = new ImplGL3();
+    }
+
+    @Override
+    public void render(int x, int y, float partialTicks) {
+
+        implGl3.newFrame();
+        implGlfw.newFrame();
+        imgui.newFrame();
+
+        imgui.text("Hello world!");
+        if (imgui.button("Open demo window", new Vec2())) {
+            showDemoWindow[0] = true;
+        }
+
+        if (showDemoWindow[0]) {
+            imgui.showDemoWindow(showDemoWindow);
+        }
+
+        imgui.render();
+        implGl3.renderDrawData(imgui.getDrawData());
+
+    }
+
+}

src/main/java/net/fabricmc/example/mixin/ExampleMixin.java

@@ -1,15 +1,38 @@
 package net.fabricmc.example.mixin;
 
+import net.fabricmc.example.ExampleMod;
+import net.fabricmc.example.ImguiScreen;
+import net.minecraft.client.Keyboard;
+import net.minecraft.client.MinecraftClient;
 import net.minecraft.client.gui.screen.TitleScreen;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 
-@Mixin(TitleScreen.class)
+
+@Mixin(Keyboard.class)
 public class ExampleMixin {
-	@Inject(at = @At("HEAD"), method = "init()V")
-	private void init(CallbackInfo info) {
-		System.out.println("This line is printed by an example mod mixin!");
+
+	/*
+		This code is injected into minecraft code during runtime.
+		this method will be called when any key is pressed.
+
+		You cannot hot-reload any code from this method.
+	 */
+	@Inject(method = "onKey", at = @At(value = "RETURN", ordinal = 4), require = 1)
+	public void onKey(long window, int key, int scancode, int i, int j, CallbackInfo info) {
+		if (MinecraftClient.getInstance().player == null) return; // Don't do anything if not ingame
+		if (key == 89 && scancode == 29 && i != 0) { // the 'y' key. i == 0 if the key was released.
+			if (ExampleMod.imguiScreen == null) {
+				ExampleMod.imguiScreen = new ImguiScreen();
+			}
+			MinecraftClient.getInstance().openScreen(ExampleMod.imguiScreen);
+		} else if (key == 82 && scancode == 27 && i != 0) {
+			if (ExampleMod.imguiScreen != null) {
+				ExampleMod.imguiScreen.reload();
+			}
+		}
 	}
-}
+
+}

src/main/resources/fabric.mod.json

@@ -28,7 +28,6 @@
 
   "depends": {
     "fabricloader": ">=0.7.2",
-    "fabric": "*",
     "minecraft": "1.15.x"
   },
   "suggests": {