SpriteFragmentProgram.cg

struct vertin
{
    float4 position  : POSITION;
    float4 color0    : COLOR0;
    float4 params    : COLOR1;			
    float4 texcoord0 : TEXCOORD0;    
    float4 params2  : TEXCOORD1;             
};

struct fragout
{
	float4 color    : COLOR;
};
 

void main_pass1(vertin IN,
			out float4 color: COLOR,
			out float depth : DEPTH,
			uniform sampler2D text		//incoming texture
			) 
{ 
	float alpha = tex2D( text, IN.texcoord0.xy).a;
	
	//discard fragments with small alpha
	if( alpha < 0.1 )
	{
		discard;
	}
			
	depth = IN.color0.w;
	
	//IN.params.z > 0.5 means that a fragment is past the splat rotation cutoff distance and it does not have to be rotated
  if( IN.params.z > 0.5 )
  {
    color = float4(IN.color0.xyz, alpha );
    return;
  }	
	
	//parametrized coordinates
	float i = (IN.texcoord0.x - 0.5)*2;
	float j = (IN.texcoord0.y - 0.5)*2;
	
	float dz = IN.params.x*i - IN.params.y*j;
	
	float l = length(float3(i,j,2*dz));
	
	if( l <1 )
	{		
		color = float4(IN.color0.xyz, alpha );		
	}
	else
	{
		discard;
	}
}

void main_pass2(vertin IN,
			out float4 color: COLOR,	
			out float depth : DEPTH,		
			uniform sampler2D text		//incoming texture
			)
{ 
	float alpha = tex2D( text, IN.texcoord0.xy).a;
	
	//discard fragments with small alpha
	if( alpha < 0.1 )
	{
		discard;
  }
  
	depth = IN.color0.w;

  //IN.params.z > 0.5 means that a fragment is past the splat rotation cutoff distance and it does not have to be rotated
  if( IN.params.z > 0.5 )
  {
    color = float4(IN.color0.xyz, alpha );            
    return;
  }

	//parametrized coordinates
	float i = (IN.texcoord0.x - 0.5)*2;
	float j = (IN.texcoord0.y - 0.5)*2;
	
	//float r2 = i*i+j*j;
	
	float dz = IN.params.x*i - IN.params.y*j;
		
	float l = length(float3(i,j,2*dz));
	
	if( l < 1  )
	{		
		color = float4(IN.color0.xyz, alpha );				
	}
	else
	{
		discard;
	}
}

void main_pass3(vertin IN,
			out float4 color: COLOR
			)
{

}