Trying to draw a red fading overlay but it just ends up weird. I tried messing around with OpenGL blend but I can't get it right, any ideas?

(How it shows in game Vs. How it should look)

                         

https://github.com/BeardlessBrady/PlayerTraits-Mod/blob/master-1.11/src/main/java/gunn/modtraits/mod/event/ClientEvents.java#L49

 

 

It appears the image's alpha is being raised to 1 above a certain threshold.

Taking a look at the pumpkin blur code in net.minecraft.client.gui.GuiIngame, the major difference in yours versus the pumpkin (which appears to have functional alpha transparencies from the image), is that "depth" and "alpha" are being disabled, and the depth mask flag is set to false before drawing the image. It also appears to be using the blend function differently.

Here's what I'm referring to:

    protected void renderPumpkinOverlay(ScaledResolution scaledRes) {
        // this stuff is what's different.
        GlStateManager.disableDepth();
        GlStateManager.depthMask(false);
        GlStateManager.tryBlendFuncSeparate(GlStateManager.SourceFactor.SRC_ALPHA, GlStateManager.DestFactor.ONE_MINUS_SRC_ALPHA, GlStateManager.SourceFactor.ONE, GlStateManager.DestFactor.ZERO);
        GlStateManager.color(1.0F, 1.0F, 1.0F, 1.0F);
        GlStateManager.disableAlpha();
      
        // the draw code looks like yours.
        this.mc.getTextureManager().bindTexture(PUMPKIN_BLUR_TEX_PATH);
        Tessellator tessellator = Tessellator.getInstance();
        // ..
        tessellator.draw();
      
      	// re-enable the things you disabled.
        GlStateManager.depthMask(true);
        GlStateManager.enableDepth();
        GlStateManager.enableAlpha();
        GlStateManager.color(1.0F, 1.0F, 1.0F, 1.0F);
    }

 

Try adding in those calls and see if that makes a difference. I know the pumpkin blur does something similar but on a smaller scale, so this may solve the issue.

I originally tried the pumpkin blur code and it was a solid red color

Fixed, Called 'GlStateManager.alphaFunc(GL11.GL_ALWAYS, 1f);' before rendering and then 'GlStateManager.alphaFunc(GL11.GL_GREATER, 0.1f)' after

Edited March 17, 20178 yr by BeardlessBrady