Adreno 505 角色不显示问题

We are currently testing our project on our dev-kits, one of which is Adreno 505.

And it confuses us a lot that whenever we use unity_ObjectToWorld in our fragment shader, there comes an error and the fragment would not be rendered.

We use snapdragon profiler to test our shader, and the glsl is like this:

This is vertex shader converted to glsl:

1. #version 300 es
3. uniform vec4 hlslcc_mtx4x4unity_ObjectToWorld[4];
4. uniform vec4 hlslcc_mtx4x4unity_MatrixVP[4];
5. in highp vec4 in_POSITION0;
6. in highp vec2 in_TEXCOORD0;
7. out highp vec2 vs_TEXCOORD0;
8. vec4 u_xlat0;
9. vec4 u_xlat1;
10. void main()
11. {
12. u_xlat0 = in_POSITION0.yyyy * hlslcc_mtx4x4unity_ObjectToWorld[1];
13. u_xlat0 = hlslcc_mtx4x4unity_ObjectToWorld[0] * in_POSITION0.xxxx + u_xlat0;
14. u_xlat0 = hlslcc_mtx4x4unity_ObjectToWorld[2] * in_POSITION0.zzzz + u_xlat0;
15. u_xlat0 = u_xlat0 + hlslcc_mtx4x4unity_ObjectToWorld[3];
16. u_xlat1 = u_xlat0.yyyy * hlslcc_mtx4x4unity_MatrixVP[1];
17. u_xlat1 = hlslcc_mtx4x4unity_MatrixVP[0] * u_xlat0.xxxx + u_xlat1;
18. u_xlat1 = hlslcc_mtx4x4unity_MatrixVP[2] * u_xlat0.zzzz + u_xlat1;
19. gl_Position = hlslcc_mtx4x4unity_MatrixVP[3] * u_xlat0.wwww + u_xlat1;
20. vs_TEXCOORD0.xy = in_TEXCOORD0.xy;
21. return;
22. }

This is the fragment shader:

1. #version 300 es
3. precision highp float;
4. precision highp int;
5. uniform vec4 hlslcc_mtx4x4unity_ObjectToWorld[4];
7. layout(location = 0) out mediump vec4 SV_Target0;
9. void main()
10. {
11. /////
12. // Red: works fine.
13. // Not render: something wrong about hlslcc_mtx4x4unity_ObjectToWorld
14. SV_Target0 = hlslcc_mtx4x4unity_ObjectToWorld[2];
15. SV_Target0 = vec4(1,0,0,1);
16. return;
17. //////////
18. }

It works fine on Mali GPUs, but it failes to render when it comes to Adreno 505.

How to handle that please?

参考：https://answers.unity.com/questions/1364928/cannot-use-unity-objecttoworld-on-the-gpu-adreno-5.html

就是说这个unity_ObjectToWorld在顶点着色器使用没有问题，但是在片元着色器使用会有问题。

修改：

使用

UnityObjectToWorldNormal函数替换我们的法线变换就好了。

// Transforms normal from object to world space
inline float3 UnityObjectToWorldNormal( in float3 norm )
{
#ifdef UNITY_ASSUME_UNIFORM_SCALING
    return UnityObjectToWorldDir(norm);
#else
    // mul(IT_M, norm) => mul(norm, I_M) => {dot(norm, I_M.col0), dot(norm, I_M.col1), dot(norm, I_M.col2)}
    return normalize(mul(norm, (float3x3)unity_WorldToObject));
#endif
}

顶点是float4，没法儿转，但是顶点着色器里不需要。