public static GLShader GeometryShaderCascaded()
{
return(GLShader.CreateGeometryShader <PerVertexOut> (3,
CascadedShadowUniforms.MapCount, PrimitiveType.Triangles,
PrimitiveType.TriangleStrip, () =>
from p in Shader.Inputs <Primitive> ()
from u in Shader.Uniforms <Shadows> ()
from c in Shader.Uniforms <CascadedShadowUniforms> ()
let viewLight = (!c.viewLightMatrices)[p.gl_InvocationID]
select new PerVertexOut[3]
{
new PerVertexOut()
{
gl_Position = ShadowShaders.ClampToNearPlane(viewLight * p.gl_in[0].gl_Position),
gl_Layer = p.gl_InvocationID
},
new PerVertexOut()
{
gl_Position = ShadowShaders.ClampToNearPlane(viewLight * p.gl_in[1].gl_Position),
gl_Layer = p.gl_InvocationID
},
new PerVertexOut()
{
gl_Position = ShadowShaders.ClampToNearPlane(viewLight * p.gl_in[2].gl_Position),
gl_Layer = p.gl_InvocationID
}
}
));
}
private static GLShader FragmentShader()
{
return(GLShader.Create(ShaderType.FragmentShader, () =>
from f in Shader.Inputs <TerrainFragment> ()
from u in Shader.Uniforms <Terrain> ()
from l in Shader.Uniforms <LightingUniforms> ()
from c in Shader.Uniforms <CascadedShadowUniforms> ()
let rockColor = FragmentShaders.TextureColor(!u.rockSampler, f.fragTexturePos)
let grassColor = FragmentShaders.TextureColor(!u.grassSampler, f.fragTexturePos)
let sandColor = FragmentShaders.TextureColor(!u.sandSampler, f.fragTexturePos)
let sandBlend = FMath.SmoothStep(2f, 4f, f.height)
let flatColor = grassColor.Mix(sandColor, sandBlend)
let rockBlend = FMath.SmoothStep(0.8f, 0.9f, f.slope)
let terrainColor = rockColor.Mix(flatColor, rockBlend)
let diffuseLight = LightingShaders.LightDiffuseIntensity(
(!l.directionalLight).direction,
(!l.directionalLight).intensity,
f.vertexNormal)
let ambient = (!l.globalLighting).ambientLightIntensity
//let shadow = ShadowShaders.PcfShadowMapFactor (f.fragPositionLightSpace, 0.0015f)
//let shadow = ShadowShaders.VarianceShadowMapFactor (new Vec4 (f.vertexPos, 1f))
let shadow = ShadowShaders.CascadedShadowMapFactor(new Vec4(f.vertexPos, 1f), 0.0015f)
let litColor = LightingShaders.GlobalLightIntensity(!l.globalLighting, ambient,
diffuseLight * shadow, new Vec3(0f), terrainColor, new Vec3(0f))
select new
{
outputColor = litColor.Mix(!u.skyColor, f.visibility)
}));
}
private static GLShader FragmentShader()
{
return(GLShader.Create
(
ShaderType.FragmentShader, () =>
from f in Shader.Inputs <EntityFragment> ()
from u in Shader.Uniforms <Entities> ()
from l in Shader.Uniforms <LightingUniforms> ()
from c in Shader.Uniforms <CascadedShadowUniforms> ()
let samplerNo = (f.fragTexturePos.X / 10f).Truncate()
let fragDiffuse =
samplerNo == 0 ? FragmentShaders.TextureColor((!u.samplers)[0], f.fragTexturePos) :
samplerNo == 1 ? FragmentShaders.TextureColor((!u.samplers)[1], f.fragTexturePos - new Vec2(10f)) :
samplerNo == 2 ? FragmentShaders.TextureColor((!u.samplers)[2], f.fragTexturePos - new Vec2(20f)) :
samplerNo == 3 ? FragmentShaders.TextureColor((!u.samplers)[3], f.fragTexturePos - new Vec2(30f)) :
f.fragDiffuse
let dirLight = LightingShaders.DirLightIntensity(!l.directionalLight, f.fragPosition,
f.fragNormal, f.fragShininess)
let totalLight = Control <LightingShaders.DiffuseAndSpecular> .For(0, (!u.pointLights).Length, dirLight,
(i, total) =>
(from pl in (!u.pointLights)[i].ToShader()
let plint = LightingShaders.PointLightIntensity(pl, f.fragPosition, f.fragNormal, f.fragShininess)
select new LightingShaders.DiffuseAndSpecular(plint.diffuse + total.diffuse,
plint.specular + total.specular))
.Evaluate())
let envLight = (!u.diffuseMap).Texture(f.fragNormal)[Coord.x, Coord.y, Coord.z]
let ambient = envLight * (!l.globalLighting).ambientLightIntensity
let reflectDiffuse = f.fragReflectivity == 0f ? fragDiffuse :
fragDiffuse.Mix(LightingShaders.ReflectedColor(!u.diffuseMap, f.fragPosition, f.fragNormal),
f.fragReflectivity)
//let shadow = ShadowShaders.PcfShadowMapFactor (f.fragPositionLightSpace, 0.0015f)
//let shadow = ShadowShaders.VarianceShadowMapFactor (new Vec4 (f.fragPosition, 1f))
let shadow = ShadowShaders.CascadedShadowMapFactor(new Vec4(f.fragPosition, 1f), 0.002f)
select new
{
outputColor = LightingShaders.GlobalLightIntensity(!l.globalLighting, ambient,
totalLight.diffuse * shadow, totalLight.specular * shadow, reflectDiffuse, f.fragSpecular)
}
));
}