From b691c43c44ff180d10e7d4a9afc83b98551ff586 Mon Sep 17 00:00:00 2001
From: daoge_cmd <3523206925@qq.com>
Date: Sun, 1 Mar 2026 12:16:08 +0800
Subject: Initial commit

---
 Minecraft.Client/ItemSpriteRenderer.cpp | 79 +++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 Minecraft.Client/ItemSpriteRenderer.cpp

(limited to 'Minecraft.Client/ItemSpriteRenderer.cpp')

diff --git a/Minecraft.Client/ItemSpriteRenderer.cpp b/Minecraft.Client/ItemSpriteRenderer.cpp
new file mode 100644
index 00000000..5a1ea620
--- /dev/null
+++ b/Minecraft.Client/ItemSpriteRenderer.cpp
@@ -0,0 +1,79 @@
+#include "stdafx.h"
+#include "ItemSpriteRenderer.h"
+#include "EntityRenderDispatcher.h"
+#include "..\Minecraft.World\net.minecraft.world.entity.projectile.h"
+#include "..\Minecraft.World\net.minecraft.world.item.alchemy.h"
+#include "..\Minecraft.World\net.minecraft.world.item.h"
+#include "..\Minecraft.World\net.minecraft.world.h"
+
+ItemSpriteRenderer::ItemSpriteRenderer(Item *sourceItem, int sourceItemAuxValue /*= 0*/) : EntityRenderer()
+{
+	this->sourceItem = sourceItem;
+	this->sourceItemAuxValue = sourceItemAuxValue;
+}
+
+//ItemSpriteRenderer::ItemSpriteRenderer(int icon) : EntityRenderer()
+//{
+//	this(sourceItem, 0);
+//}
+
+void ItemSpriteRenderer::render(shared_ptr<Entity> e, double x, double y, double z, float rot, float a)
+{
+	// the icon is already cached in the item object, so there should not be any performance impact by not caching it here
+	Icon *icon = sourceItem->getIcon(sourceItemAuxValue);
+	if (icon == NULL)
+	{
+		return;
+	}
+
+    glPushMatrix();
+
+    glTranslatef((float) x, (float) y, (float) z);
+    glEnable(GL_RESCALE_NORMAL);
+    glScalef(1 / 2.0f, 1 / 2.0f, 1 / 2.0f);
+    bindTexture(TN_GUI_ITEMS);	// 4J - was L"/gui/items.png"
+    Tesselator *t = Tesselator::getInstance();
+
+	if (icon == PotionItem::getTexture(PotionItem::THROWABLE_ICON) )
+	{
+
+		int col = PotionBrewing::getColorValue((dynamic_pointer_cast<ThrownPotion>(e) )->getPotionValue(), false);
+		float red = ((col >> 16) & 0xff) / 255.0f;
+		float g = ((col >> 8) & 0xff) / 255.0f;
+		float b = ((col) & 0xff) / 255.0f;
+
+
+		glColor3f(red, g, b);
+		glPushMatrix();
+		renderIcon(t, PotionItem::getTexture(PotionItem::CONTENTS_ICON));
+		glPopMatrix();
+		glColor3f(1, 1, 1);
+	}
+
+	renderIcon(t, icon);
+
+	glDisable(GL_RESCALE_NORMAL);
+	glPopMatrix();
+}
+
+void ItemSpriteRenderer::renderIcon(Tesselator *t, Icon *icon)
+{
+    float u0 = icon->getU0();
+    float u1 = icon->getU1();
+    float v0 = icon->getV0();
+    float v1 = icon->getV1();
+
+    float r = 1.0f;
+    float xo = 0.5f;
+    float yo = 0.25f;
+
+    glRotatef(180 - entityRenderDispatcher->playerRotY, 0, 1, 0);
+    glRotatef(-entityRenderDispatcher->playerRotX, 1, 0, 0);
+    t->begin();
+    t->normal(0, 1, 0);
+    t->vertexUV((float)(0 - xo), (float)( 0 - yo), (float)( 0), (float)( u0), (float)( v1));
+    t->vertexUV((float)(r - xo), (float)( 0 - yo), (float)( 0), (float)( u1), (float)( v1));
+    t->vertexUV((float)(r - xo), (float)( r - yo), (float)( 0), (float)( u1), (float)( v0));
+    t->vertexUV((float)(0 - xo), (float)( r - yo), (float)( 0), (float)( u0), (float)( v0));
+    t->end();
+}
\ No newline at end of file
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