Is this Assembly Language ?

[apapaxionga]

i found these code in an example ,it seems that its fouction just like fragment shader.Do any document can help me learn this kind of assembly Language? or can someone tell me the meaning of the fellowing code?

char _fp_peel[] =
"!!ARBfp1.0\n"
"OPTION ARB_fragment_program_shadow;\n"
"TEMP R0;\n"
"TEX R0.x, fragment.position, texture[0], SHADOWRECT;\n"
"ADD R0.x, R0.x, -0.5;\n"
"KIL R0.x;\n"
"MOV result.color, fragment.color;\n"
"END\n";