From 3bf19b4566e95e8d0f62b1e32ed9da6a7701dd7c Mon Sep 17 00:00:00 2001
From: William Thompson <aesen@unascribed.com>
Date: Mon, 25 Sep 2017 19:43:28 -0400
Subject: [PATCH] Use display lists for heart rendering. Closes #12

This worked *perfect* first try. I'm scared.
---
 .../glasshearts/client/ClientProxy.java       |  3 ++
 .../glasshearts/client/RenderGlassHeart.java  | 30 +++++++++++++++----
 2 files changed, 28 insertions(+), 5 deletions(-)

diff --git a/src/main/java/com/elytradev/glasshearts/client/ClientProxy.java b/src/main/java/com/elytradev/glasshearts/client/ClientProxy.java
index e18fcba..d1deb79 100644
--- a/src/main/java/com/elytradev/glasshearts/client/ClientProxy.java
+++ b/src/main/java/com/elytradev/glasshearts/client/ClientProxy.java
@@ -44,6 +44,8 @@ public class ClientProxy extends CommonProxy {
 	private List<TileEntityGlassHeart> glassHearts = Lists.newArrayList();
 	public List<GuiParticle> guiParticles = Lists.newArrayList();
 	
+	public static int ticks;
+	
 	@Override
 	public void onPreInit() {
 		super.onPreInit();
@@ -169,6 +171,7 @@ public void onTooltip(ItemTooltipEvent e) {
 	public void onTick(ClientTickEvent e) {
 		if (e.phase == Phase.START) {
 			if (!Minecraft.getMinecraft().isGamePaused()) {
+				ticks++;
 				Minecraft.getMinecraft().mcProfiler.startSection("glasshearts:guiparticlesupdate"); {
 					Iterator<GuiParticle> iter = guiParticles.iterator();
 					while (iter.hasNext()) {
diff --git a/src/main/java/com/elytradev/glasshearts/client/RenderGlassHeart.java b/src/main/java/com/elytradev/glasshearts/client/RenderGlassHeart.java
index 150a6b5..8655be7 100644
--- a/src/main/java/com/elytradev/glasshearts/client/RenderGlassHeart.java
+++ b/src/main/java/com/elytradev/glasshearts/client/RenderGlassHeart.java
@@ -30,8 +30,11 @@
 
 public class RenderGlassHeart extends TileEntitySpecialRenderer<TileEntityGlassHeart> {
 
+	private int[] displayLists = new int[EnumGlassColor.values().length];
+	private int[] lastHash = new int[EnumGlassColor.values().length];
+	
 	public static float getAnimTime(TileEntityGlassHeart te, float partialTicks) {
-		return (((te.getWorld().getTotalWorldTime()+te.hashCode())%24000)+partialTicks);
+		return (((ClientProxy.ticks+te.hashCode())%24000)+partialTicks);
 	}
 	
 	@Override
@@ -45,6 +48,25 @@ public void render(TileEntityGlassHeart te, double x, double y, double z, float
 		IBlockState outerState = GlassHearts.inst.GLASS_HEART.getDefaultState().withProperty(BlockGlassHeart.INNER, false).withProperty(BlockGlassHeart.STAINED, stained);
 		
 		IBakedModel outer = brd.getModelForState(outerState);
+		
+		int listIdx = te.getColor().ordinal();
+		int hash = outer.hashCode();
+		
+		if (lastHash[listIdx] != hash || displayLists[listIdx] == 0) {
+			if (displayLists[listIdx] != 0) {
+				GlStateManager.glDeleteLists(displayLists[listIdx], 1);
+			}
+			displayLists[listIdx] = GlStateManager.glGenLists(1);
+			lastHash[listIdx] = hash;
+			GlStateManager.glNewList(displayLists[listIdx], GL11.GL_COMPILE);
+			if (stained) {
+				float[] color = EntitySheep.getDyeRgb(te.getColor().dye);
+				bmr.renderModelBrightnessColor(outerState, outer, 1f, color[0], color[1], color[2]);
+			} else {
+				bmr.renderModelBrightnessColor(outerState, outer, 1f, 1f, 1f, 1f);
+			}
+			GlStateManager.glEndList();
+		}
 
 		bindTexture(TextureMap.LOCATION_BLOCKS_TEXTURE);
 		GlStateManager.pushMatrix();
@@ -108,7 +130,6 @@ public void render(TileEntityGlassHeart te, double x, double y, double z, float
 			GlStateManager.popMatrix();
 		}
 		
-		
 		if (stained) {
 			GlStateManager.enableBlend();
 			GlStateManager.tryBlendFuncSeparate(SourceFactor.SRC_ALPHA, DestFactor.ONE_MINUS_SRC_ALPHA,
@@ -118,10 +139,9 @@ public void render(TileEntityGlassHeart te, double x, double y, double z, float
 			GlStateManager.disableBlend();
 		}
 		if (stained && MinecraftForgeClient.getRenderPass() == 1) {
-			float[] color = EntitySheep.getDyeRgb(te.getColor().dye);
-			bmr.renderModelBrightnessColor(outerState, outer, 1f, color[0], color[1], color[2]);
+			GlStateManager.callList(displayLists[listIdx]);
 		} else if (MinecraftForgeClient.getRenderPass() == 0) {
-			bmr.renderModelBrightnessColor(outerState, outer, 1f, 1f, 1f, 1f);
+			GlStateManager.callList(displayLists[listIdx]);
 		}
 		GlStateManager.disableRescaleNormal();
 		GlStateManager.disableBlend();