public LightChannel(uint flags, RGBAPixel mat, RGBAPixel amb, uint color, uint alpha)
{
_flags = flags;
_matColor = mat;
_ambColor = amb;
_color = new LightChannelControl(color) { _parent = this };
_alpha = new LightChannelControl(alpha) { _parent = this };
}
// coloralpha - 1 if color, 2 if alpha
public string GenerateLightShader(int index, LightChannelControl chan, string lightsName, int coloralpha)
{
string s = "";
string swizzle = "xyzw";
if (coloralpha == 1) swizzle = "xyz";
else if (coloralpha == 2) swizzle = "w";
if (chan.Attenuation == GXAttnFn.None)
{
// atten disabled
switch (chan.DiffuseFunction)
{
case GXDiffuseFn.Disabled:
w(ref s, "lacc.{0} += {1}[{2}].{3};\n", swizzle, lightsName, index * 5, swizzle);
break;
case GXDiffuseFn.Enabled:
case GXDiffuseFn.Clamped:
w(ref s, "ldir = normalize({0}[{1} + 3].xyz - pos.xyz);\n", lightsName, index * 5);
w(ref s, "lacc.{0} += {1}dot(ldir, _norm0)) * {2}[{3}].{4};\n", swizzle, chan.DiffuseFunction != GXDiffuseFn.Enabled ? "max(0.0f," : "(", lightsName, index * 5, swizzle);
break;
}
}
else
{
// spec and spot
if (chan.Attenuation == GXAttnFn.Spotlight)
{
// spot
w(ref s, "ldir = {0}[{1} + 3].xyz - pos.xyz;\n", lightsName, index * 5);
w(ref s, "dist2 = dot(ldir, ldir);\n" +
"dist = sqrt(dist2);\n" +
"ldir = ldir / dist;\n" +
"attn = max(0.0f, dot(ldir, {0}[{1} + 4].xyz));\n", lightsName, index * 5);
w(ref s, "attn = max(0.0f, dot({0}[{1} + 1].xyz, float3(1.0f, attn, attn*attn))) / dot({2}[{3} + 2].xyz, float3(1.0f,dist,dist2));\n", lightsName, index * 5, lightsName, index * 5);
}
if (chan.Attenuation == GXAttnFn.Specular)
{
// specular
w(ref s, "ldir = normalize({0}[{1} + 3].xyz);\n", lightsName, index * 5);
w(ref s, "attn = (dot(_norm0, ldir) >= 0.0f) ? max(0.0f, dot(_norm0, {0}[{1} + 4].xyz)) : 0.0f;\n", lightsName, index * 5);
w(ref s, "attn = max(0.0f, dot({0}[{1} + 1].xyz, float3(1,attn,attn*attn))) / dot({2}[{3} + 2].xyz, float3(1,attn,attn*attn));\n", lightsName, index * 5, lightsName, index * 5);
}
switch (chan.DiffuseFunction)
{
case GXDiffuseFn.Disabled:
w(ref s, "lacc.{0} += attn * {1}[{2}].{3};\n", swizzle, lightsName, index * 5, swizzle);
break;
case GXDiffuseFn.Enabled:
case GXDiffuseFn.Clamped:
w(ref s, "lacc.{0} += attn * {1}dot(ldir, _norm0)) * {2}[{3}].{4};\n",
swizzle,
chan.DiffuseFunction != GXDiffuseFn.Enabled ? "max(0.0f," : "(",
lightsName,
index * 5,
swizzle);
break;
}
}
w(ref s, "\n");
return s;
}
