I have a custom GuiScreen that I open on the GuiOpenEvent. It replaces the GuiIventory Gui. The problem I have is that the new GUI that I render's texture is 100% alpha, with different levels of alpha. It all works by making GL calls to enable / disable the alpha and blend, but I have a weird problem for when the player hovers over the 2x2 crafting grid or the armor slots - the alpha level darkens for the slots. What is causing this? Why is the alpha changing when I hover over only the armor slots and crafting grid? Where are the armor slot icons (the icons displaying the different types of armors) rendered? If anyone can help me out I'd appreciate it.

Please show your code.

Here you are:

 

Replacing Vanilla GUI Inventory

@SubscribeEvent
public void onEvent(GuiOpenEvent event)
{
	if(event.gui instanceof GuiInventory)
	{
		event.setCanceled(true);
		Minecraft.getMinecraft().displayGuiScreen(new GuiInventoryTextured(Minecraft.getMinecraft().thePlayer));
	}
}

 

My Custom GUI Inventory

@SideOnly(Side.CLIENT)
public class GuiInventoryTextured extends InventoryEffectRenderer
{

    private float oldMouseX;
    private float oldMouseY;

    public GuiInventoryTextured(EntityPlayer entityplayer)
    {
        super(entityplayer.inventoryContainer);
        this.allowUserInput = true;
    }
    
    @Override
    public void updateScreen()
    {
        if (this.mc.playerController.isInCreativeMode())
        {
            this.mc.displayGuiScreen(new GuiContainerCreative(this.mc.thePlayer));
        }
        this.updateActivePotionEffects();
    }

    @Override
    public void initGui()
    {
        this.buttonList.clear();

        if (this.mc.playerController.isInCreativeMode())
        {
            this.mc.displayGuiScreen(new GuiContainerCreative(this.mc.thePlayer));
        }
        else
        {
            super.initGui();
        }
    }

    @Override
    protected void drawGuiContainerForegroundLayer(int mouseX, int mouseY)
    {
    	GlStateManager.pushMatrix();
    	GlStateManager.enableAlpha();
    	GlStateManager.enableBlend();
        this.fontRendererObj.drawString(I18n.format("container.crafting", new Object[0]), 86, 16, 4210752);
        GlStateManager.disableBlend();
        GlStateManager.disableAlpha();
        GlStateManager.popMatrix();
    }

    @Override
    public void drawScreen(int mouseX, int mouseY, float partialTicks)
    {
        super.drawScreen(mouseX, mouseY, partialTicks);
        this.oldMouseX = (float)mouseX;
        this.oldMouseY = (float)mouseY;
    }

    @Override
    protected void drawGuiContainerBackgroundLayer(float partialTicks, int mouseX, int mouseY)
    {
    	GlStateManager.pushMatrix();
    	GlStateManager.enableAlpha();
    	GlStateManager.enableBlend();
        this.mc.getTextureManager().bindTexture(new ResourceLocation(MainReference.ID + ":" + "textures/gui/inventory.png"));
        int k = this.guiLeft;
        int l = this.guiTop;
        this.drawTexturedModalRect(k, l, 0, 0, this.xSize, this.ySize);
        drawEntityOnScreen(k + 51, l + 75, 30, (float)(k + 51) - this.oldMouseX, (float)(l + 75 - 50) - this.oldMouseY, this.mc.thePlayer);
        GlStateManager.disableBlend();
        GlStateManager.disableAlpha();
        GlStateManager.popMatrix();
    }

    public static void drawEntityOnScreen(int p_147046_0_, int p_147046_1_, int p_147046_2_, float p_147046_3_, float p_147046_4_, EntityLivingBase p_147046_5_)
    {
        GlStateManager.enableColorMaterial();
        GlStateManager.pushMatrix();
        GlStateManager.translate((float)p_147046_0_, (float)p_147046_1_, 50.0F);
        GlStateManager.scale((float)(-p_147046_2_), (float)p_147046_2_, (float)p_147046_2_);
        GlStateManager.rotate(180.0F, 0.0F, 0.0F, 1.0F);
        float f2 = p_147046_5_.renderYawOffset;
        float f3 = p_147046_5_.rotationYaw;
        float f4 = p_147046_5_.rotationPitch;
        float f5 = p_147046_5_.prevRotationYawHead;
        float f6 = p_147046_5_.rotationYawHead;
        GlStateManager.rotate(135.0F, 0.0F, 1.0F, 0.0F);
        RenderHelper.enableStandardItemLighting();
        GlStateManager.rotate(-135.0F, 0.0F, 1.0F, 0.0F);
        GlStateManager.rotate(-((float)Math.atan((double)(p_147046_4_ / 40.0F))) * 20.0F, 1.0F, 0.0F, 0.0F);
        p_147046_5_.renderYawOffset = (float)Math.atan((double)(p_147046_3_ / 40.0F)) * 20.0F;
        p_147046_5_.rotationYaw = (float)Math.atan((double)(p_147046_3_ / 40.0F)) * 40.0F;
        p_147046_5_.rotationPitch = -((float)Math.atan((double)(p_147046_4_ / 40.0F))) * 20.0F;
        p_147046_5_.rotationYawHead = p_147046_5_.rotationYaw;
        p_147046_5_.prevRotationYawHead = p_147046_5_.rotationYaw;
        GlStateManager.translate(0.0F, 0.0F, 0.0F);
        RenderManager rendermanager = Minecraft.getMinecraft().getRenderManager();
        rendermanager.setPlayerViewY(180.0F);
        rendermanager.setRenderShadow(false);
        rendermanager.renderEntityWithPosYaw(p_147046_5_, 0.0D, 0.0D, 0.0D, 0.0F, 1.0F);
        rendermanager.setRenderShadow(true);
        p_147046_5_.renderYawOffset = f2;
        p_147046_5_.rotationYaw = f3;
        p_147046_5_.rotationPitch = f4;
        p_147046_5_.prevRotationYawHead = f5;
        p_147046_5_.rotationYawHead = f6;
        GlStateManager.popMatrix();
        RenderHelper.disableStandardItemLighting();
        GlStateManager.disableRescaleNormal();
        GlStateManager.setActiveTexture(OpenGlHelper.lightmapTexUnit);
        GlStateManager.disableTexture2D();
        GlStateManager.setActiveTexture(OpenGlHelper.defaultTexUnit);
    }

    protected void actionPerformed(GuiButton button) throws IOException
    {
        if (button.id == 0)
        {
            this.mc.displayGuiScreen(new GuiAchievements(this, this.mc.thePlayer.getStatFileWriter()));
        }
        if (button.id == 1)
        {
            this.mc.displayGuiScreen(new GuiStats(this, this.mc.thePlayer.getStatFileWriter()));
        }
    }
}

 

Only Modified Method In My Custom GUI Inventory (GUI code is copied from GuiInventory and this method is modified only)

@Override
    protected void drawGuiContainerBackgroundLayer(float partialTicks, int mouseX, int mouseY)
    {
    	GlStateManager.pushMatrix();
    	GlStateManager.enableAlpha();
    	GlStateManager.enableBlend();
        this.mc.getTextureManager().bindTexture(new ResourceLocation(MainReference.ID + ":" + "textures/gui/inventory.png"));
        int k = this.guiLeft;
        int l = this.guiTop;
        this.drawTexturedModalRect(k, l, 0, 0, this.xSize, this.ySize);
        drawEntityOnScreen(k + 51, l + 75, 30, (float)(k + 51) - this.oldMouseX, (float)(l + 75 - 50) - this.oldMouseY, this.mc.thePlayer);
        GlStateManager.disableBlend();
        GlStateManager.disableAlpha();
        GlStateManager.popMatrix();
    }

 

I don't know where the slots for the armor are rendered - I'm pretty sure it is causing the issue since the alpha changes when I hover over the slots (also, same for the crafting grid).

Try setting GlStateManager.color to 1, 1, 1, 1.

Try setting GlStateManager.color to 1, 1, 1, 1.

 

That didn't do a thing. Again, I think its located where the armor slots are rendered, but I can't find any trace of where they are.

I think you need a GL.end() and GL.start() in there somewhere if you want to change certain properties, like alpha, and not retro-actively overwrite.

 

I can't tell from here, though.

Well, i can't see the method that draws the rectangle when you hoover over the slot. Where is it?

I fixed the problem. Solution - push the matrix, enable blend, bind the texture and draw the textured rect., disable blend, then finally pop the matrix.

 

TIP - You can simply modify the GUI's by extending them and overriding their methods (then set the GUI field in the GUIOpenEvent to your GUI) rather than copying the whole GUI class and calling displayGuiScreen() like shown above, unless you need access to private methods / fields and don't want to use reflection;