/// <summary>
/// BRDFで使用するLUTを生成する(UE4方式)
/// </summary>
public static Texture CreateBRDFLookUpTable(GraphicsContext context, int w, int h)
{
var tex = new Texture(new Texture.InitDesc {
bindFlag = TextureBuffer.BindFlag.IsRenderTarget,
width = w,
height = h,
format = SlimDX.DXGI.Format.R16G16_Float,
});
Lib.Rect rect = new Lib.Rect(new Vector3(-1.0f, 1.0f, 0.0f), new Vector3(1.0f, -1.0f, 0.0f));
var prim = new Prim("GenerateBRDF_LUT", (uint)Shader.VertexAttr.TEXCOORD0);
prim.AddRect(ref rect);
prim.GetMaterial().DepthState = RenderState.DepthState.None;
GraphicsCore.FrameBuffer frameBuffer = new GraphicsCore.FrameBuffer();
frameBuffer.color_buffer_ = new Texture[1] {
tex
};
context.SetRenderTargets(frameBuffer.color_buffer_, null);
prim.Draw(context);
prim.Dispose();
return(tex);
}
/// <summary>
/// PBR用プレフィルタキューブマップを作成する
/// </summary>
/// <param name="output"></param>
/// <param name="source"></param>
public static void PrefilterRadiance(Texture output, Texture source)
{
Lib.Rect rect = new Lib.Rect(new Vector3(-1.0f, 1.0f, 0.0f), new Vector3(1.0f, -1.0f, 0.0f));
var prim = new Prim("PrefilterRadianceMap", (uint)Shader.VertexAttr.TEXCOORD0);
prim.AddRect(ref rect);
prim.GetMaterial().DepthState = RenderState.DepthState.None;
prim.GetMaterial().SetShaderViewPS(0, source);
int miplevel = 1;
int size = source.Width;
while (size > 1)
{
size = size >> 1;
miplevel++;
}
// テクスチャを再生成
output.Dispose();
output.Initialize(new Texture.InitDesc()
{
bindFlag = TextureBuffer.BindFlag.IsRenderTarget,
optionFlags = ResourceOptionFlags.TextureCube,
width = source.Width,
height = source.Height,
mips = miplevel,
format = SlimDX.DXGI.Format.R16G16B16A16_Float,
});
GraphicsCore.FrameBuffer frameBuffer = new GraphicsCore.FrameBuffer();
frameBuffer.color_buffer_ = new Texture[1] {
output
};
frameBuffer.is_array_buffer_ = true;
// 描画
for (int m = 0; m < miplevel; m++)
{
for (int i = 0; i < 6; i++)
{
// コンスタントバッファ
Shader.SetConstantBufferUpdateFunc("CB_PrefilterCubeMap", (s, inst) => {
dynamic cb = inst;
cb.g_face = (float)i;
cb.g_mipLevel = (float)m;
cb.g_maxMipLevel = (float)miplevel;
return(true);
});
frameBuffer.array_buffer_index_ = m * 6 + i;
// TODO:
//GraphicsCore.BeginRender(frameBuffer);
//prim.Draw();
//GraphicsCore.EndRender();
}
}
prim.Dispose();
}
/// <summary>
///
/// </summary>
public void Dispose()
{
blurPrim_.Dispose();
shadowMap_.Dispose();
foreach (var o in blurMap_)
{
o.Dispose();
}
}
/// <summary>
///
/// </summary>
public void Dispose()
{
foreach (var t in avgBuffer_)
{
t.Dispose();
}
luminanceAvg_.Dispose();
prim_.Dispose();
lumResolveShader_.Dispose();
}
static public void Dispose()
{
prim_.Dispose();
}
