static NSRange GenerateSliceRange(MgImageSubresourceRange subresourceRange)
{
return(new NSRange
{
Location = (nint)subresourceRange.BaseArrayLayer,
Length = (nint)subresourceRange.LayerCount,
});
}
static NSRange GenerateLevelRange(MgImageSubresourceRange subresourceRange)
{
return(new NSRange
{
Location = (nint)subresourceRange.BaseMipLevel,
Length = (nint)subresourceRange.LevelCount,
});
}
// Create an image memory barrier for changing the layout of
// an image and put it into an active command buffer
void setImageLayout(IMgCommandBuffer cmdBuffer, IMgImage image, MgImageAspectFlagBits aspectMask, MgImageLayout oldImageLayout, MgImageLayout newImageLayout, MgImageSubresourceRange subresourceRange)
{
// Create an image barrier object
var imageMemoryBarrier = new MgImageMemoryBarrier
{
OldLayout = oldImageLayout,
NewLayout = newImageLayout,
Image = image,
SubresourceRange = subresourceRange,
};
// Only sets masks for layouts used in this example
// For a more complete version that can be used with other layouts see IMgTools::setImageLayout
// Source layouts (old)
switch (oldImageLayout)
{
case MgImageLayout.UNDEFINED:
// Only valid as initial layout, memory contents are not preserved
// Can be accessed directly, no source dependency required
imageMemoryBarrier.SrcAccessMask = 0;
break;
case MgImageLayout.PREINITIALIZED:
// Only valid as initial layout for linear images, preserves memory contents
// Make sure host writes to the image have been finished
imageMemoryBarrier.SrcAccessMask = MgAccessFlagBits.HOST_WRITE_BIT;
break;
case MgImageLayout.TRANSFER_DST_OPTIMAL:
// Old layout is transfer destination
// Make sure any writes to the image have been finished
imageMemoryBarrier.SrcAccessMask = MgAccessFlagBits.TRANSFER_WRITE_BIT;
break;
}
// Target layouts (new)
switch (newImageLayout)
{
case MgImageLayout.TRANSFER_SRC_OPTIMAL:
// Transfer source (copy, blit)
// Make sure any reads from the image have been finished
imageMemoryBarrier.DstAccessMask = MgAccessFlagBits.TRANSFER_READ_BIT;
break;
case MgImageLayout.TRANSFER_DST_OPTIMAL:
// Transfer destination (copy, blit)
// Make sure any writes to the image have been finished
imageMemoryBarrier.DstAccessMask = MgAccessFlagBits.TRANSFER_WRITE_BIT;
break;
case MgImageLayout.SHADER_READ_ONLY_OPTIMAL:
// Shader read (sampler, input attachment)
imageMemoryBarrier.DstAccessMask = MgAccessFlagBits.SHADER_READ_BIT;
break;
}
// Put barrier on top of pipeline
var srcStageFlags = MgPipelineStageFlagBits.TOP_OF_PIPE_BIT;
var destStageFlags = MgPipelineStageFlagBits.TOP_OF_PIPE_BIT;
// Put barrier inside setup command buffer
cmdBuffer.CmdPipelineBarrier(
srcStageFlags,
destStageFlags,
0,
null,
null,
new[] { imageMemoryBarrier });
}
