1 files changed, 43 insertions, 0 deletions
diff --git a/src/main/java/com/anthonyhilyard/iceberg/util/GuiHelper.java b/src/main/java/com/anthonyhilyard/iceberg/util/GuiHelper.java
new file mode 100644
index 0000000..4325ebe
--- /dev/null
+++ b/src/main/java/com/anthonyhilyard/iceberg/util/GuiHelper.java
@@ -0,0 +1,43 @@
+package com.anthonyhilyard.iceberg.util;
+
+import org.lwjgl.opengl.GL11;
+import com.mojang.blaze3d.systems.RenderSystem;
+import net.minecraft.client.renderer.BufferBuilder;
+import net.minecraft.client.renderer.Tessellator;
+import net.minecraft.client.renderer.vertex.DefaultVertexFormats;
+import net.minecraft.util.math.vector.Matrix4f;
+
+public class GuiHelper
+{
+	@SuppressWarnings("deprecation")
+	public static void drawGradientRectHorizontal(Matrix4f mat, int zLevel, int left, int top, int right, int bottom, int startColor, int endColor)
+	{
+		float startAlpha = (float)(startColor >> 24 & 255) / 255.0F;
+		float startRed   = (float)(startColor >> 16 & 255) / 255.0F;
+		float startGreen = (float)(startColor >>  8 & 255) / 255.0F;
+		float startBlue  = (float)(startColor       & 255) / 255.0F;
+		float endAlpha   = (float)(endColor   >> 24 & 255) / 255.0F;
+		float endRed     = (float)(endColor   >> 16 & 255) / 255.0F;
+		float endGreen   = (float)(endColor   >>  8 & 255) / 255.0F;
+		float endBlue    = (float)(endColor         & 255) / 255.0F;
+
+		RenderSystem.enableDepthTest();
+		RenderSystem.disableTexture();
+		RenderSystem.enableBlend();
+		RenderSystem.defaultBlendFunc();
+		RenderSystem.shadeModel(GL11.GL_SMOOTH);
+
+		Tessellator tessellator = Tessellator.getInstance();
+		BufferBuilder buffer = tessellator.getBuilder();
+		buffer.begin(GL11.GL_QUADS, DefaultVertexFormats.POSITION_COLOR);
+		buffer.vertex(mat, right,    top, zLevel).color(  endRed,   endGreen,   endBlue,   endAlpha).endVertex();
+		buffer.vertex(mat,  left,    top, zLevel).color(startRed, startGreen, startBlue, startAlpha).endVertex();
+		buffer.vertex(mat,  left, bottom, zLevel).color(startRed, startGreen, startBlue, startAlpha).endVertex();
+		buffer.vertex(mat, right, bottom, zLevel).color(  endRed,   endGreen,   endBlue,   endAlpha).endVertex();
+		tessellator.end();
+
+		RenderSystem.shadeModel(GL11.GL_FLAT);
+		RenderSystem.disableBlend();
+		RenderSystem.enableTexture();
+	}
+}