public TextureCube Generate(Texture2D equirectangularTexture)
{
// I don't seem to have problems with 'Pre-filter convolution artifacts' but in case of
// problems check that section: https://learnopengl.com/PBR/IBL/Specular-IBL
this.Device.BlendState = BlendState.Opaque;
this.Device.DepthStencilState = DepthStencilState.None;
this.Device.RasterizerState = RasterizerState.CullCounterClockwise;
this.Device.SamplerStates[0] = SamplerState.LinearClamp;
this.Effect.EquirectangularTexture = equirectangularTexture;
this.Effect.EquirectangularTextureSampler = SamplerState.LinearClamp;
var cubeMap = new TextureCube(this.Device, resolution, true, SurfaceFormat.HalfVector4);
var mipResolution = resolution;
for (var mipMapLevel = 0; mipMapLevel < cubeMap.LevelCount; mipMapLevel++)
{
var roughness = mipMapLevel / (cubeMap.LevelCount - 1.0f);
this.Effect.Roughness = roughness;
CubeMapUtilities.RenderFaces(this.Device, cubeMap, mipResolution, SurfaceFormat.HalfVector4, mipMapLevel, this.Apply);
mipResolution /= 2;
}
return(cubeMap);
}
public TextureCube Generate(Texture2D equirectangularTexture)
{
this.Device.BlendState = BlendState.Opaque;
this.Device.DepthStencilState = DepthStencilState.None;
this.Device.RasterizerState = RasterizerState.CullCounterClockwise;
this.Effect.EquirectangularTexture = equirectangularTexture;
this.Effect.EquirectangularTextureSampler = SamplerState.LinearClamp;
return(CubeMapUtilities.RenderFaces(this.Device, resolution, SurfaceFormat.HalfVector4, this.Apply));
}
