void FilterCubemapCommon(CommandBuffer cmd,
Texture source, RenderTexture target, int mipCount,
Matrix4x4[] worldToViewMatrices)
{
// Solid angle associated with a texel of the cubemap.
float invOmegaP = (6.0f * source.width * source.width) / (4.0f * Mathf.PI);
m_GgxConvolveMaterial.SetTexture("_MainTex", source);
m_GgxConvolveMaterial.SetTexture("_GgxIblSamples", m_GgxIblSampleData);
m_GgxConvolveMaterial.SetFloat("_InvOmegaP", invOmegaP);
for (int mip = 1; mip < ((int)EnvConstants.SpecCubeLodStep + 1); ++mip)
{
using (new ProfilingSample(cmd, "Filter Cubemap Mip {0}", mip))
{
for (int face = 0; face < 6; ++face)
{
var faceSize = new Vector4(source.width >> mip, source.height >> mip, 1.0f / (source.width >> mip), 1.0f / (source.height >> mip));
var transform = SkyManager.ComputePixelCoordToWorldSpaceViewDirectionMatrix(0.5f * Mathf.PI, faceSize, worldToViewMatrices[face], true);
var props = new MaterialPropertyBlock();
props.SetFloat("_Level", mip);
props.SetMatrix(ClusterShaderIDs._PixelCoordToViewDirWS, transform);
CoreUtils.SetRenderTarget(cmd, target, ClearFlag.None, mip, (CubemapFace)face);
CoreUtils.DrawFullScreen(cmd, m_GgxConvolveMaterial, props);
}
}
}
}
