public static void projectCubeBuffer(ref SHEncoding sh, CubeBuffer cube)
{
sh.clearToBlack();
float totalarea = 0f;
ulong faceSize = (ulong)cube.faceSize;
float[] dc = new float[9];
Vector3 u = Vector3.zero;
for (ulong face = 0; face < 6; ++face)
{
for (ulong y = 0; y < faceSize; ++y)
{
for (ulong x = 0; x < faceSize; ++x)
{
//compute cube direction
float areaweight = 1f;
mset.Util.invCubeLookup(ref u, ref areaweight, face, x, y, faceSize);
float shscale = 4f / 3f;
ulong index = face * faceSize * faceSize + y * faceSize + x;
Color rgba = cube.pixels[index];
//project on basis functions, and accumulate
dc[0] = project_l0_m0(u);
dc[1] = project_l1_mneg1(u);
dc[2] = project_l1_m0(u);
dc[3] = project_l1_m1(u);
dc[4] = project_l2_mneg2(u);
dc[5] = project_l2_mneg1(u);
dc[6] = project_l2_m0(u);
dc[7] = project_l2_m1(u);
dc[8] = project_l2_m2(u);
for (int i = 0; i < 9; ++i)
{
sh.c[3 * i + 0] += shscale * areaweight * rgba[0] * dc[i];
sh.c[3 * i + 1] += shscale * areaweight * rgba[1] * dc[i];
sh.c[3 * i + 2] += shscale * areaweight * rgba[2] * dc[i];
}
totalarea += areaweight;
}
}
}
//complete the integration by dividing by total area
scale(ref sh, 16f / totalarea);
}
public static void projectCubeBuffer(ref SHEncoding sh, CubeBuffer cube)
{
sh.clearToBlack();
float totalarea = 0f;
ulong faceSize = (ulong)cube.faceSize;
float[] dc = new float[9];
Vector3 u = Vector3.zero;
for(ulong face=0; face<6; ++face)
for(ulong y=0; y<faceSize; ++y)
for(ulong x=0; x<faceSize; ++x) {
//compute cube direction
float areaweight = 1f;
mset.Util.invCubeLookup(ref u, ref areaweight, face, x, y, faceSize);
float shscale = 4f / 3f;
ulong index = face*faceSize*faceSize + y*faceSize + x;
Color rgba = cube.pixels[index];
//project on basis functions, and accumulate
dc[0] = project_l0_m0(u);
dc[1] = project_l1_mneg1(u);
dc[2] = project_l1_m0(u);
dc[3] = project_l1_m1(u);
dc[4] = project_l2_mneg2(u);
dc[5] = project_l2_mneg1(u);
dc[6] = project_l2_m0(u);
dc[7] = project_l2_m1(u);
dc[8] = project_l2_m2(u);
for(int i=0; i<9; ++i ) {
sh.c[3*i + 0] += shscale * areaweight * rgba[0] * dc[i];
sh.c[3*i + 1] += shscale * areaweight * rgba[1] * dc[i];
sh.c[3*i + 2] += shscale * areaweight * rgba[2] * dc[i];
}
totalarea += areaweight;
}
//complete the integration by dividing by total area
scale( ref sh, 16f / totalarea );
}
private static bool GUIToSky(ref Texture skyCube, ref bool skyHDR, mset.SHEncoding skySH, mset.CubemapGUI cubeGUI)
{
//cubeGUI -> sky
bool prevHDR = cubeGUI.HDR;
Texture prevInput = cubeGUI.input;
cubeGUI.drawGUI();
skyCube = cubeGUI.input;
skyHDR = cubeGUI.HDR;
bool dirty = false;
//copy spherical harmonics if they've changed
if (cubeGUI.computeSH)
{
if (skySH != null)
{
if (cubeGUI.SH == null)
{
skySH.clearToBlack();
dirty = true;
}
else if (!skySH.equals(cubeGUI.SH))
{
skySH.copyFrom(cubeGUI.SH);
dirty = true;
}
skySH.copyToBuffer();
}
}
//return true if the cubeGUI gui changed any parameters
dirty |= prevHDR != cubeGUI.HDR;
dirty |= prevInput != cubeGUI.input;
return(dirty);
}
public void projectToSH(ref SHEncoding SH)
{
updateBuffers();
SH.clearToBlack();
SHUtil.projectCubeBuffer(ref SH, this.buffers[0]);
}