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