public BMPAlloc Allocate(DynamicAtlasCore 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, ownedState = OwnedState.Owned
});
} // 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, ownedState = OwnedState.Owned
});
}
void ReallyCreateAtlas()
{
m_Atlas = new DynamicAtlasCore(
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 default allocs
// The order of allocation from the atlas below is important. See the comment at the beginning of Construct().
RectInt rcTransform, rcClipRect, rcOpacity, rcTextCoreSettings;
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);
m_Atlas.AllocateRect(pageWidth * m_TextSettingsAllocator.entryWidth, pageHeight * m_TextSettingsAllocator.entryHeight, out rcTextCoreSettings);
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");
}
if (!AtlasRectMatchesPage(ref m_TextSettingsAllocator, defaultTextCoreSettings, rcTextCoreSettings))
{
throw new Exception("Atlas text setting allocation failed unexpectedly");
}
var whiteTexel = UIRenderDevice.whiteTexel;
if (m_VertexTexturingEnabled)
{
SetTransformValue(identityTransform, identityTransformValue);
SetClipRectValue(infiniteClipRect, infiniteClipRectValue);
}
{
SetOpacityValue(fullOpacity, fullOpacityValue.w);
SetTextCoreSettingValue(defaultTextCoreSettings, defaultTextCoreSettingsValue);
}
m_AtlasReallyCreated = true;
}
public void Dispose()
{
if (m_Atlas != null)
{
m_Atlas.Dispose();
}
m_Atlas = null;
if (m_ClipRects.IsCreated)
{
m_ClipRects.Dispose();
}
if (m_Transforms.IsCreated)
{
m_Transforms.Dispose();
}
m_AtlasReallyCreated = false;
}
