Unity5 v Unity4 Shader array errors

Questions & Answers
1

in a CG shader with 4.6 the following methods for declaring arrays work, but in Unity 5.0 I am now getting either errors, or a black shader, and “upgrades” preventing compilation on various platforms. All the following variations previously worked, but now produce bad results.

float2[2] array;

float2[] array;

float2[2] array = 
{
	float2(1,  0),
	float2(0,  1),
};

float2[] array = 
{
	float2(1,  0),
	float2(0,  1),
};
2

It appears that array syntax is slightly different now. This is likely because D3D9 shader compiler was switched from Cg 2.2 to HLSL.

After a brief look at HLSL Syntax arrays are declared and initialised slightly differently. In CG in 4.6 you would declare an array in this format.

float[2] array;

float2[] array;
 
float2[2] array = 
{
    float2(1,  0),
    float2(0,  1),
};

float2[] array = 
{
    float2(1,  0),
    float2(0,  1),
};

in Unity 5.0 it now has to be declared like so.

float array[2];

// NOT ALLOWED! Array needs a length
float2 array[];


float2 array[2] = 
{
    float2(1,  0),
    float2(0,  1),
};

float2 array[] = 
{
    float2(1,  0),
    float2(0,  1),
};