protected override void GenerateMipmapsCore(Texture texture)
{
EnsureNoRenderPass();
VkTexture vkTex = Util.AssertSubtype <Texture, VkTexture>(texture);
vkTex.TransitionImageLayout(_cb, 0, 1, 0, vkTex.ArrayLayers, VkImageLayout.TransferSrcOptimal);
vkTex.TransitionImageLayout(_cb, 1, vkTex.MipLevels - 1, 0, vkTex.ArrayLayers, VkImageLayout.TransferDstOptimal);
VkImage deviceImage = vkTex.OptimalDeviceImage;
uint blitCount = vkTex.MipLevels - 1;
VkImageBlit *regions = stackalloc VkImageBlit[(int)blitCount];
for (uint level = 1; level < vkTex.MipLevels; level++)
{
uint blitIndex = level - 1;
regions[blitIndex].srcSubresource = new VkImageSubresourceLayers
{
aspectMask = VkImageAspectFlags.Color,
baseArrayLayer = 0,
layerCount = vkTex.ArrayLayers,
mipLevel = 0
};
regions[blitIndex].srcOffsets_0 = new VkOffset3D();
regions[blitIndex].srcOffsets_1 = new VkOffset3D {
x = (int)vkTex.Width, y = (int)vkTex.Height, z = (int)vkTex.Depth
};
regions[blitIndex].dstOffsets_0 = new VkOffset3D();
regions[blitIndex].dstSubresource = new VkImageSubresourceLayers
{
aspectMask = VkImageAspectFlags.Color,
baseArrayLayer = 0,
layerCount = vkTex.ArrayLayers,
mipLevel = level
};
Util.GetMipDimensions(vkTex, level, out uint mipWidth, out uint mipHeight, out uint mipDepth);
regions[blitIndex].dstOffsets_1 = new VkOffset3D {
x = (int)mipWidth, y = (int)mipHeight, z = (int)mipDepth
};
}
vkCmdBlitImage(
_cb,
deviceImage, VkImageLayout.TransferSrcOptimal,
deviceImage, VkImageLayout.TransferDstOptimal,
blitCount, regions,
_gd.GetFormatFilter(vkTex.VkFormat));
if ((vkTex.Usage & TextureUsage.Sampled) != 0)
{
// This is somewhat ugly -- the transition logic does not handle different source layouts, so we do two batches.
vkTex.TransitionImageLayout(_cb, 0, 1, 0, vkTex.ArrayLayers, VkImageLayout.ShaderReadOnlyOptimal);
vkTex.TransitionImageLayout(_cb, 1, vkTex.MipLevels - 1, 0, vkTex.ArrayLayers, VkImageLayout.ShaderReadOnlyOptimal);
}
}
public void CmdBlitImage(
[FromProperty("this")] GenCommandBuffer commandBuffer,
GenImage srcImage,
VkImageLayout srcImageLayout,
GenImage dstImage,
VkImageLayout dstImageLayout,
[CountFor("regions")] int regionCount,
[IsArray] VkImageBlit *pRegions,
VkFilter filter)
{
}
