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// R = I-2(N・I)N
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// ベクトルIを求める
"sub ft0, v0, fc18\n" + // fc18 == eye(0,0,-1)
// (N・I)を求める
"dp3 ft6, v1, ft0\n" +
// (N・I)・Nを求める
"mul ft6, ft6, v1\n" +
// -2(N・I)・Nを求める
"add ft6, ft6, ft6\n" +
"neg ft6, ft6\n" +
// R = I-2(N・I)・Nを求める
"add ft0, ft0, ft6\n" +
"nrm ft0.xyz, ft0.xyz\n" + // ft0 == 反射視線R
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// uv値を求める
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// vec q = cross(dir, e2)
"crs ft6.xyz, ft0.xyz, fc17.xyz\n" +
// float s = dot(q, e1)
"dp3 ft2.xyz, ft6.xyz, fc16.xyz\n" + // ft2 == s
// vec3 e = org - po
"sub ft3, v0, fc15\n" + // ft3 == e
// vec3 r = cross(e, e1)
"crs ft4.xyz, ft3.xyz, fc16.xyz\n" + // ft4 == r
// u = dot(q, e)/s
"dp3 ft6.x, ft6.xyz, ft3.xyz\n" +
"div ft7.x, ft6.x, ft2.x\n" +
// v = dot(r, dir)/s
"dp3 ft3.xyz, ft4.xyz, ft0.xyz\n" +
"div ft7.y, ft3.xyz, ft2.x\n" +
"mov ft4.xy, ft7.xy\n" +
// ft4.xy == uv
// if(s!=0.0)
"sne ft6.x, ft2.x, fc19.x\n" +
"seq ft7.x, ft2.x, fc19.x\n" +
"mul ft6.xy, ft4.xy, ft6.xx\n" +
"mul ft7.xy, fc20.xy, ft7.xx\n" + // fc20 == 100
"add ft4.xy, ft6.xy, ft7.xy\n" +
//////////////////////////////////
// if(u >= 0 && v >= 0 && w >= 0)
//////////////////////////////////
// if(u >= 0
"sge ft6.x, ft4.x, fc19.x\n" + // ft4 == u >= fc19.x == 0.0
"slt ft7.x, ft4.x, fc19.x\n" + // ft4 == u < fc19.x == 0.0
"mul ft6.x, ft4.x, ft6.x\n" +
"mul ft7.x, fc20.x, ft7.x\n" + // fc19 == 0.0
"add ft4.x, ft6.x, ft7.x\n" + // ft4.xにuの値が格納される
"mov ft5.xy, fc19.xy\n" + // ft5 == 0 （初期化）
"mov ft1, fc19\n" + // ft1 == 0 （初期化）
// && v >= 0
"sge ft6.x, ft4.y, fc19.x\n" + // ft4 == v >= fc19.x == 0.0
"slt ft7.x, ft4.y, fc19.x\n" + // ft4 == v < fc19.x == 0.0
"mul ft6.xy, ft4.xy, ft6.xx\n" +
"mul ft7.xy, fc20.xy, ft7.xx\n" + // fc20 == 100.0
"add ft4.xy, ft6.xy, ft7.xy\n" +
// w = 2 - u - tを求める
"sub ft4.z, fc21.x, ft4.x\n" + // 2 - u
"sub ft4.z, ft4.z, ft4.y\n" + // 2 - u
//&& w >= 0)
"sge ft6.x, ft4.z, fc19.x\n" + // ft4.z == w >= fc19.x == 0.0
"slt ft7.x, ft4.z, fc19.x\n" + // ft4.z == w < fc19.x == 0.0
"mul ft6.xyz, ft4.xyz, ft6.xxx\n" +
"mul ft7.xyz, fc19.xyz, ft7.xxx\n" + // fc19 == 0.0
"add ft4.xyz, ft6.xyz, ft7.xyz\n" +
"add ft5.xy, ft5.xy, ft4.xy\n" + // ft5 == uv値
"tex ft7, ft4.xy, fs0 <2d,repeat,linear,nomip>\n" +
"sne ft6.x, ft4.x, fc20.x\n" + // fc20 == 100
"mul ft7, ft7, ft6.xxxx.\n" + // ft7 == RGBA
"add ft1, ft1, ft7\n" +
"mov oc, ft1"
