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__kernel void cl_color_to_alpha(__global const float4 *in,
__global float4 *out,
float4 color)
{
int gid = get_global_id(0);
float4 in_v = in[gid];
float4 out_v = in_v;
float4 alpha;
alpha.w = in_v.w;
/*First component*/
if ( color.x < 0.00001f )
alpha.x = in_v.x;
else if ( in_v.x > color.x + 0.00001f )
alpha.x = (in_v.x - color.x) / (1.0f - color.x);
else if ( in_v.x < color.x - 0.00001f )
alpha.x = (color.x - in_v.x) / color.x;
else
alpha.x = 0.0f;
/*Second component*/
if ( color.y < 0.00001f )
alpha.y = in_v.y;
else if ( in_v.y > color.y + 0.00001f )
alpha.y = (in_v.y - color.y) / (1.0f - color.y);
else if ( in_v.y < color.y - 0.00001f )
alpha.y = (color.y - in_v.y) / color.y;
else
alpha.y = 0.0f;
/*Third component*/
if ( color.z < 0.00001f )
alpha.z = in_v.z;
else if ( in_v.z > color.z + 0.00001f )
alpha.z = (in_v.z - color.z) / (1.0f - color.z);
else if ( in_v.z < color.z - 0.00001f )
alpha.z = (color.z - in_v.z) / color.z;
else
alpha.z = 0.0f;
if (alpha.x > alpha.y)
{
if (alpha.x > alpha.z)
out_v.w = alpha.x;
else
out_v.w = alpha.z;
}
else if (alpha.y > alpha.z)
{
out_v.w = alpha.y;
}
else
{
out_v.w = alpha.z;
}
if (out_v.w >= 0.00001f)
{
out_v.xyz = (out_v.xyz - color.xyz) / out_v.www + color.xyz;
out_v.w *= alpha.w;
}
out[gid] = out_v;
}
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