URP Android Canvas.RenderSubBatch takes 62% GPU time

Unity Engine
, ,
1

Hi,
Were trying to update to using URP and have encountered strange performance issues.
As you can see in the picture below Canvas.RendererSubBatch is taking up 62% of GPU time.
This happens on Android build. In editor no such problem.
Also in the build on android before using the standard rendering pipeline we had no such issues.
We are using unity 2019.4.15f and URP 7.5.3
Any help would be appreciated.

6837401--795581--Capture.PNG
6837401--795581--Capture.PNG1957Ă—574 73.6 KB

This is before updating to URP using standard rendering pipeline

6837401--795584--old Render.PNG
6837401--795584--old Render.PNG1343Ă—488 61.1 KB

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2

had a similar issue would also like an answer to this

3

Did you manage to find a solution?

4

I’ve seen @MartinTilo answering similar questions in the past , maybe he can shed some light on what’s going on here. These GPU times are not making any sense.

5

Sorry, I don’t really have any deep knowledge on these markers and what is going on here and the only thing I can recommend for further context here is to use Platform Specific Profiler’s like Arm Mobile Studio or Snapdragon profilers as well as RenderDoc.

3 Likes
6

I’m reviving this thread to see if anybody has a solution. I’m experiencing the same issue and it looks like SRP Batching is not working with anything Canvas Related.

7820133--989523--Screen Shot 2022-01-18 at 19.35.36.jpg
7820133--989523--Screen Shot 2022-01-18 at 19.35.36.jpg1776Ă—1586 320 KB

7

Are you using world space for canvas? The read I’m getting is that it is not overlay draw calls.

// Unity built-in shader source. Copyright (c) 2016 Unity Technologies. MIT license (see license.txt)

Shader "UI/Default"
{
    Properties
    {
        [PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}
        _Color ("Tint", Color) = (1,1,1,1)

        _StencilComp ("Stencil Comparison", Float) = 8
        _Stencil ("Stencil ID", Float) = 0
        _StencilOp ("Stencil Operation", Float) = 0
        _StencilWriteMask ("Stencil Write Mask", Float) = 255
        _StencilReadMask ("Stencil Read Mask", Float) = 255

        _ColorMask ("Color Mask", Float) = 15

        [Toggle(UNITY_UI_ALPHACLIP)] _UseUIAlphaClip ("Use Alpha Clip", Float) = 0
    }

    SubShader
    {
        Tags
        {
            "Queue"="Transparent"
            "IgnoreProjector"="True"
            "RenderType"="Transparent"
            "PreviewType"="Plane"
            "CanUseSpriteAtlas"="True"
        }

        Stencil
        {
            Ref [_Stencil]
            Comp [_StencilComp]
            Pass [_StencilOp]
            ReadMask [_StencilReadMask]
            WriteMask [_StencilWriteMask]
        }

        Cull Off
        Lighting Off
        ZWrite Off
        ZTest [unity_GUIZTestMode]
        Blend SrcAlpha OneMinusSrcAlpha
        ColorMask [_ColorMask]

        Pass
        {
            Name "Default"
        CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #pragma target 2.0

            #include "UnityCG.cginc"
            #include "UnityUI.cginc"

            #pragma multi_compile_local _ UNITY_UI_CLIP_RECT
            #pragma multi_compile_local _ UNITY_UI_ALPHACLIP

            struct appdata_t
            {
                float4 vertex   : POSITION;
                float4 color    : COLOR;
                float2 texcoord : TEXCOORD0;
                UNITY_VERTEX_INPUT_INSTANCE_ID
            };

            struct v2f
            {
                float4 vertex   : SV_POSITION;
                fixed4 color    : COLOR;
                float2 texcoord  : TEXCOORD0;
                float4 worldPosition : TEXCOORD1;
                UNITY_VERTEX_OUTPUT_STEREO
            };

            sampler2D _MainTex;
            fixed4 _Color;
            fixed4 _TextureSampleAdd;
            float4 _ClipRect;
            float4 _MainTex_ST;

            v2f vert(appdata_t v)
            {
                v2f OUT;
                UNITY_SETUP_INSTANCE_ID(v);
                UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);
                OUT.worldPosition = v.vertex;
                OUT.vertex = UnityObjectToClipPos(OUT.worldPosition);

                OUT.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex);

                OUT.color = v.color * _Color;
                return OUT;
            }

            fixed4 frag(v2f IN) : SV_Target
            {
                half4 color = (tex2D(_MainTex, IN.texcoord) + _TextureSampleAdd) * IN.color;

                #ifdef UNITY_UI_CLIP_RECT
                color.a *= UnityGet2DClipping(IN.worldPosition.xy, _ClipRect);
                #endif

                #ifdef UNITY_UI_ALPHACLIP
                clip (color.a - 0.001);
                #endif

                return color;
            }
        ENDCG
        }
    }
}

Unity’s built-in doesn’t really match SRP batching requirements so it’s perfectly normal.

8

It’s a “Screen Space - Camera” canvas but I switched to overlay and it didn’t help.

Maybe I’m missing something obvious I’m using URP for this project instead of built-in. If this is normal, how do you batch all the GUI rendering in URP projects?

9

Batching for UI is done by ui system itself. You can use UI Profiler to see how its being done internally.

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