pass item id to item shader

modules/core_lib/effects.lua

@@ -14,7 +14,7 @@ end
 function Effects.fadeOut(widget, time, elapsed)
     if not elapsed then elapsed = 0 end
     if not time then time = 250 end
-    widget:setOpacity((time - elapsed)/time)
+    widget:setOpacity(math.max((time - elapsed)/time, 0))
     if elapsed < time then
         scheduleEvent(function()
                         Effects.fadeOut(widget, time, elapsed + 30)

src/otclient/core/item.cpp

@@ -49,6 +49,7 @@ ItemPtr Item::create(int id)
 }
 
 PainterShaderProgramPtr itemProgram;
+int ITEM_ID_UNIFORM = 10;
 
 void Item::draw(const Point& dest, float scaleFactor, bool animate)
 {
@@ -167,8 +168,11 @@ void Item::draw(const Point& dest, float scaleFactor, bool animate)
         itemProgram->addShaderFromSourceCode(Shader::Vertex, glslMainWithTexCoordsVertexShader + glslPositionOnlyVertexShader);
         itemProgram->addShaderFromSourceFile(Shader::Fragment, "/game_shaders/item.frag");
         assert(itemProgram->link());
+        itemProgram->bindUniformLocation(ITEM_ID_UNIFORM, "itemId");
     }
     g_painter.setCustomProgram(itemProgram);
+    itemProgram->bind();
+    itemProgram->setUniformValue(ITEM_ID_UNIFORM, (int)m_id);
 
     // now we can draw the item
     internalDraw(dest, scaleFactor, xPattern, yPattern, zPattern, animationPhase);