void ReallyCreateAtlas()
{
m_Atlas = new UIRAtlasManager(
m_VertexTexturingEnabled ? RenderTextureFormat.ARGBFloat : RenderTextureFormat.ARGB32, // If no vertex texturing, only store opacity in ARGB32
FilterMode.Point, // Filtering is never needed for this texture
Math.Max(pageWidth, pageHeight * 3), // Each transform row is stored vertically
64); // Because we want predictable placement of first pages, 64 will fit all three default allocs
// The order of allocation from the atlas below is important. See the comment at the beginning of Construct().
RectInt rcTransform, rcClipRect, rcOpacity;
m_Atlas.AllocateRect(pageWidth * m_TransformAllocator.entryWidth, pageHeight * m_TransformAllocator.entryHeight, out rcTransform);
m_Atlas.AllocateRect(pageWidth * m_ClipRectAllocator.entryWidth, pageHeight * m_ClipRectAllocator.entryHeight, out rcClipRect);
m_Atlas.AllocateRect(pageWidth * m_OpacityAllocator.entryWidth, pageHeight * m_OpacityAllocator.entryHeight, out rcOpacity);
if (!AtlasRectMatchesPage(ref m_TransformAllocator, identityTransform, rcTransform))
{
throw new Exception("Atlas identity transform allocation failed unexpectedly");
}
if (!AtlasRectMatchesPage(ref m_ClipRectAllocator, infiniteClipRect, rcClipRect))
{
throw new Exception("Atlas infinite clip rect allocation failed unexpectedly");
}
if (!AtlasRectMatchesPage(ref m_OpacityAllocator, fullOpacity, rcOpacity))
{
throw new Exception("Atlas full opacity allocation failed unexpectedly");
}
var whiteTexel = UIRenderDevice.whiteTexel;
if (m_VertexTexturingEnabled)
{
var allocXY = AllocToTexelCoord(ref m_TransformAllocator, identityTransform);
m_Atlas.EnqueueBlit(whiteTexel, allocXY.x, allocXY.y + 0, false, identityTransformRow0Value);
m_Atlas.EnqueueBlit(whiteTexel, allocXY.x, allocXY.y + 1, false, identityTransformRow1Value);
m_Atlas.EnqueueBlit(whiteTexel, allocXY.x, allocXY.y + 2, false, identityTransformRow2Value);
allocXY = AllocToTexelCoord(ref m_ClipRectAllocator, infiniteClipRect);
m_Atlas.EnqueueBlit(whiteTexel, allocXY.x, allocXY.y, false, infiniteClipRectValue);
}
{
var allocXY = AllocToTexelCoord(ref m_OpacityAllocator, fullOpacity);
m_Atlas.EnqueueBlit(whiteTexel, allocXY.x, allocXY.y, false, fullOpacityValue);
}
m_AtlasReallyCreated = true;
}
public BMPAlloc Allocate(UIRAtlasManager atlasManager)
{
int pageCount = m_Pages.Count;
for (int pageIndex = 0; pageIndex < pageCount; pageIndex++)
{
var pageInfo = m_Pages[pageIndex];
if (pageInfo.freeSlots == 0)
{
continue;
}
int line = pageIndex * m_PageHeight;
int endLine = line + m_PageHeight;
for (; line < endLine; line++)
{
var allocBits = m_AllocMap[line];
if (allocBits == 0)
{
continue;
}
byte allocIndex = CountTrailingZeroes(allocBits);
m_AllocMap[line] = allocBits & (~(1U << allocIndex));
pageInfo.freeSlots--;
m_Pages[pageIndex] = pageInfo;
return(new BMPAlloc()
{
page = pageIndex, pageLine = (ushort)(line - pageIndex * m_PageHeight), bitIndex = allocIndex, owned = 1
});
} // For each line
} // For each page
RectInt uvRect;
if ((atlasManager == null) || !atlasManager.AllocateRect(kPageWidth * m_EntryWidth, m_PageHeight * m_EntryHeight, out uvRect))
{
return(BMPAlloc.Invalid);
}
m_AllocMap.Capacity += m_PageHeight;
m_AllocMap.Add(0xFFFFFFFE); // Reserve first slot
for (int i = 1; i < m_PageHeight; i++)
{
m_AllocMap.Add(0xFFFFFFFF);
}
m_Pages.Add(new Page()
{
x = (UInt16)uvRect.xMin, y = (UInt16)uvRect.yMin, freeSlots = kPageWidth * m_PageHeight - 1
});
return(new BMPAlloc()
{
page = m_Pages.Count - 1, owned = 1
});
}
public BMPAlloc Allocate(UIRAtlasManager atlasManager)
{
int count = this.m_Pages.Count;
BMPAlloc result;
for (int i = 0; i < count; i++)
{
BitmapAllocator32.Page page = this.m_Pages[i];
bool flag = page.freeSlots == 0;
if (!flag)
{
int j = i * this.m_PageHeight;
int num = j + this.m_PageHeight;
while (j < num)
{
uint num2 = this.m_AllocMap[j];
bool flag2 = num2 == 0u;
if (!flag2)
{
byte b = BitmapAllocator32.CountTrailingZeroes(num2);
this.m_AllocMap[j] = (num2 & ~(1u << (int)b));
page.freeSlots--;
this.m_Pages[i] = page;
result = new BMPAlloc
{
page = i,
pageLine = (ushort)(j - i * this.m_PageHeight),
bitIndex = b,
ownedState = OwnedState.Owned
};
return(result);
}
j++;
}
}
}
RectInt rectInt;
bool flag3 = atlasManager == null || !atlasManager.AllocateRect(32 * this.m_EntryWidth, this.m_PageHeight * this.m_EntryHeight, out rectInt);
if (flag3)
{
result = BMPAlloc.Invalid;
return(result);
}
this.m_AllocMap.Capacity += this.m_PageHeight;
this.m_AllocMap.Add(4294967294u);
for (int k = 1; k < this.m_PageHeight; k++)
{
this.m_AllocMap.Add(4294967295u);
}
this.m_Pages.Add(new BitmapAllocator32.Page
{
x = (ushort)rectInt.xMin,
y = (ushort)rectInt.yMin,
freeSlots = 32 * this.m_PageHeight - 1
});
result = new BMPAlloc
{
page = this.m_Pages.Count - 1,
ownedState = OwnedState.Owned
};
return(result);
}