Add GUI utils.

common/src/main/kotlin/fr/username404/snowygui/ClickGui.kt

@@ -0,0 +1,10 @@
+package fr.username404.snowygui
+
+import fr.username404.snowygui.gui.Element
+import fr.username404.snowygui.gui.SnowyScreen
+
+class ClickGui: SnowyScreen() {
+    override val components: MutableSet<Element> = mutableSetOf(
+        // TODO Add components to the ClickGui
+    )
+}

common/src/main/kotlin/fr/username404/snowygui/SnowyScreen.kt

@@ -1,8 +0,0 @@
-package fr.username404.snowygui
-
-import net.minecraft.client.gui.screens.Screen
-import net.minecraft.network.chat.TranslatableComponent
-
-internal class SnowyScreen: Screen(TranslatableComponent("screen.snowy.gui")) {
-
-}

common/src/main/kotlin/fr/username404/snowygui/config/AddKeyMaps.kt

@@ -1,7 +1,7 @@
 package fr.username404.snowygui.config
 
 import com.mojang.blaze3d.platform.InputConstants
-import fr.username404.snowygui.SnowyScreen
+import fr.username404.snowygui.ClickGui
 import net.minecraft.client.KeyMapping
 import net.minecraft.client.Minecraft
 import org.lwjgl.glfw.GLFW.GLFW_KEY_U
@@ -17,7 +17,7 @@ object AddKeyMaps {
         ) to lambda
     }
     val list: MutableMap<KeyMapping, (() -> Unit)?> = mutableMapOf(
-        mkMap("opengui", GLFW_KEY_Y) { Minecraft.getInstance().setScreen(SnowyScreen()) },
+        mkMap("opengui", GLFW_KEY_Y) { Minecraft.getInstance().setScreen(ClickGui()) },
         mkMap("configkey", GLFW_KEY_U) { Minecraft.getInstance().setScreen(SnowyConfigScreen()) }
     )
 }

common/src/main/kotlin/fr/username404/snowygui/config/ConfigScreen.kt

@@ -1,8 +1,10 @@
 package fr.username404.snowygui.config
 
-import net.minecraft.client.gui.screens.Screen
+import fr.username404.snowygui.gui.Element
-import net.minecraft.network.chat.TranslatableComponent
+import fr.username404.snowygui.gui.SnowyScreen
-
-open class SnowyConfigScreen: Screen(TranslatableComponent("screen.snowygui.config")) { // TODO Actual config screen
 
+open class SnowyConfigScreen: SnowyScreen("screen.snowygui.config") { // TODO Actual config screen
+    override val components: MutableSet<Element>? = mutableSetOf(
+        // TODO Add components to the config gui
+    )
 }

common/src/main/kotlin/fr/username404/snowygui/gui/Box.kt

@@ -0,0 +1,9 @@
+package fr.username404.snowygui.gui
+
+import fr.username404.snowygui.rendering.Util
+
+class Box(x: Int, y: Int, scale: Int): Element(x, y, 20 * scale, 10 * scale) {
+    override fun render() {
+        Util.UIRect(x, y, this.width, this.height, opacity = 1F)
+    }
+}

common/src/main/kotlin/fr/username404/snowygui/gui/Element.kt

@@ -0,0 +1,10 @@
+package fr.username404.snowygui.gui
+
+fun interface Renderable { fun render() }
+abstract class Element(
+    var x: Int, var y: Int,
+    val width: Int, val height: Int
+): Renderable {
+    fun display() { if (!hidden) render() }
+    var hidden: Boolean = false
+}

common/src/main/kotlin/fr/username404/snowygui/gui/SnowyScreen.kt

@@ -0,0 +1,17 @@
+package fr.username404.snowygui.gui
+
+import com.mojang.blaze3d.vertex.PoseStack
+import net.minecraft.client.gui.screens.Screen
+import net.minecraft.network.chat.TranslatableComponent
+
+abstract class SnowyScreen(translatableString: String = "screen.snowy.gui", private val willPauseScreen: Boolean = false): Screen(TranslatableComponent(translatableString)) {
+    open val components: MutableSet<Element>? = null
+    override fun render(poseStack: PoseStack?, i: Int, j: Int, f: Float) {
+        if (poseStack != null) {
+            components?.forEach {
+                it.display()
+            }
+        }
+    }
+    override fun isPauseScreen(): Boolean = willPauseScreen
+}

common/src/main/kotlin/fr/username404/snowygui/rendering/Util.kt

@@ -0,0 +1,41 @@
+package fr.username404.snowygui.rendering
+
+import com.mojang.blaze3d.platform.GlStateManager
+import com.mojang.blaze3d.systems.RenderSystem
+import com.mojang.blaze3d.vertex.BufferBuilder
+import com.mojang.blaze3d.vertex.DefaultVertexFormat
+import com.mojang.blaze3d.vertex.PoseStack
+import com.mojang.blaze3d.vertex.Tesselator
+import net.minecraft.client.Minecraft
+import org.lwjgl.opengl.GL11
+
+internal object Util {
+    private val tessellator: Tesselator = Tesselator.getInstance()
+    private val buffer: BufferBuilder = tessellator.builder
+    fun UIRect(x: Int, y: Int, width: Int, height: Int, color: Int = -0x1, opacity: Float) {
+        val r = (color shr 16 and 255) / 255.0f
+        val g = (color shr 8 and 255) / 255.0f
+        val b = (color and 255) / 255.0f
+        RenderSystem.enableBlend()
+        RenderSystem.disableTexture()
+        RenderSystem.blendFuncSeparate(
+            GlStateManager.SourceFactor.SRC_ALPHA,
+            GlStateManager.DestFactor.ONE_MINUS_SRC_ALPHA,
+            GlStateManager.SourceFactor.ONE,
+            GlStateManager.DestFactor.ZERO
+        )
+        with(buffer) {
+            begin(GL11.GL_QUADS, DefaultVertexFormat.POSITION_COLOR)
+            vertex(x.toDouble(), y.toDouble() + height, 0.0).color(r, g, b, opacity).endVertex()
+            vertex(x.toDouble() + width, y.toDouble() + height, 0.0).color(r, g, b, opacity).endVertex()
+            vertex(x.toDouble() + width, y.toDouble(), 0.0).color(r, g, b, opacity).endVertex()
+            vertex(x.toDouble(), y.toDouble(), 0.0).color(r, g, b, opacity).endVertex()
+            tessellator.end()
+            RenderSystem.enableTexture()
+            RenderSystem.disableBlend()
+        }
+    }
+    fun UIString(poseStack: PoseStack, string: String, i: Float, j: Float) {
+        Minecraft.getInstance().font.draw(poseStack, string, i, j, 10)
+    }
+}