void RenderSkyToCubemap(BuiltinSkyParameters builtinParams, SkySettings skySettings, RenderTexture target)
{
for (int i = 0; i < 6; ++i)
{
builtinParams.pixelCoordToViewDirMatrix[0] = m_facePixelCoordToViewDirMatrices[i];
builtinParams.invViewProjMatrix[0] = m_faceCameraInvViewProjectionMatrix[i];
builtinParams.colorBuffer = target;
builtinParams.depthBuffer = BuiltinSkyParameters.nullRT;
CoreUtils.SetRenderTarget(builtinParams.commandBuffer, target, ClearFlag.None, 0, (CubemapFace)i);
m_Renderer.RenderSky(builtinParams, false, true);
}
// Generate mipmap for our cubemap
Debug.Assert(target.autoGenerateMips == false);
builtinParams.commandBuffer.GenerateMips(target);
}
void RenderCubemapGGXConvolution(CommandBuffer cmd, BuiltinSkyParameters builtinParams, SkySettings skyParams, Texture input, RenderTexture target)
{
using (new ProfilingSample(cmd, "Update Env: GGX Convolution"))
{
int mipCount = 1 + (int)Mathf.Log(input.width, 2.0f);
if (mipCount < ((int)EnvConstants.SpecCubeLodStep + 1))
{
Debug.LogWarning("RenderCubemapGGXConvolution: Cubemap size is too small for GGX convolution, needs at least " + ((int)EnvConstants.SpecCubeLodStep + 1) + " mip levels");
return;
}
if (!m_iblFilterGgx.IsInitialized())
{
m_iblFilterGgx.Initialize(cmd);
}
// Copy the first mip
using (new ProfilingSample(cmd, "Copy Original Mip"))
{
for (int f = 0; f < 6; f++)
{
cmd.CopyTexture(input, f, 0, target, f, 0);
}
}
using (new ProfilingSample(cmd, "GGX Convolution"))
{
if (m_useMIS && m_iblFilterGgx.supportMis)
{
m_iblFilterGgx.FilterCubemapMIS(cmd, input, target, mipCount, m_SkyboxConditionalCdfRT, m_SkyboxMarginalRowCdfRT, m_faceWorldToViewMatrixMatrices);
}
else
{
m_iblFilterGgx.FilterCubemap(cmd, input, target, mipCount, m_faceWorldToViewMatrixMatrices);
}
}
}
}
void RebuildTextures(SkySettings skySettings)
{
int resolution = 256;
// Parameters not set yet. We need them for the resolution.
if (skySettings != null)
{
resolution = (int)skySettings.resolution;
}
if ((m_SkyboxCubemapRT != null) && (m_SkyboxCubemapRT.width != resolution))
{
CoreUtils.Destroy(m_SkyboxCubemapRT);
CoreUtils.Destroy(m_SkyboxGGXCubemapRT);
CoreUtils.Destroy(m_SkyboxMarginalRowCdfRT);
CoreUtils.Destroy(m_SkyboxConditionalCdfRT);
m_SkyboxCubemapRT = null;
m_SkyboxGGXCubemapRT = null;
m_SkyboxMarginalRowCdfRT = null;
m_SkyboxConditionalCdfRT = null;
}
if (m_SkyboxCubemapRT == null)
{
m_SkyboxCubemapRT = new RenderTexture(resolution, resolution, 0, RenderTextureFormat.ARGBHalf, RenderTextureReadWrite.Linear)
{
dimension = TextureDimension.Cube,
useMipMap = true,
autoGenerateMips = false, // We will generate regular mipmap for filtered importance sampling manually
filterMode = FilterMode.Trilinear
};
m_SkyboxCubemapRT.Create();
m_SkyboxGGXCubemapRT = new RenderTexture(resolution, resolution, 0, RenderTextureFormat.ARGBHalf, RenderTextureReadWrite.Linear)
{
dimension = TextureDimension.Cube,
useMipMap = true,
autoGenerateMips = false,
filterMode = FilterMode.Trilinear
};
m_SkyboxGGXCubemapRT.Create();
if (m_useMIS)
{
int width = (int)LightSamplingParameters.TextureWidth;
int height = (int)LightSamplingParameters.TextureHeight;
// + 1 because we store the value of the integral of the cubemap at the end of the texture.
m_SkyboxMarginalRowCdfRT = new RenderTexture(height + 1, 1, 0, RenderTextureFormat.RFloat, RenderTextureReadWrite.Linear)
{
useMipMap = false,
autoGenerateMips = false,
enableRandomWrite = true,
filterMode = FilterMode.Point
};
m_SkyboxMarginalRowCdfRT.Create();
// TODO: switch the format to R16 (once it's available) to save some bandwidth.
m_SkyboxConditionalCdfRT = new RenderTexture(width, height, 0, RenderTextureFormat.RFloat, RenderTextureReadWrite.Linear)
{
useMipMap = false,
autoGenerateMips = false,
enableRandomWrite = true,
filterMode = FilterMode.Point
};
m_SkyboxConditionalCdfRT.Create();
}
m_UpdatedFramesRequired = 2; // Special case. Even if update mode is set to OnDemand, we need to regenerate the environment after destroying the texture.
}
m_CubemapScreenSize = new Vector4((float)resolution, (float)resolution, 1.0f / (float)resolution, 1.0f / (float)resolution);
}