public void NewMaterials_7()
{
var selector = new PerMaterialTextureStorageQuery(
new MgPhysicalDeviceLimits
{
MaxUniformBufferRange = 400,
MaxStorageBufferRange = 300,
MaxPerStageDescriptorStorageBuffers = 1,
MaxPerStageDescriptorSampledImages = 100,
}
);
var actual = selector.GetElementRange(
MgBufferUsageFlagBits.UNIFORM_BUFFER_BIT,
5U,
20U);
// since it's storage is should be limited by the
// number of texture slots / 5 => 20 << SAME
// number of storage space / data size => 20U << SAME
var expected = 20U;
Assert.AreEqual(expected, actual);
}
private static int[] AllocateMaterials(MgtfMaterial[] materials, MgStorageBlockAllocationRequest dynamicRequest, MgPhysicalDeviceLimits limits)
{
// materials
var query = new PerMaterialTextureStorageQuery(limits);
var noOfSamplers = query.GetMaxNoOfCombinedImageSamplers();
const uint PBR_TEXTURES_PER_MATERIALS = 5U;
var blockSize = (uint)Marshal.SizeOf(typeof(MaterialUBO));
const uint HI_RES = 32U;
const uint LOW_RES = 16U;
// GONNA RESERVE 5 BINDINGS SLOTS
// IN VK, a global binding range is used by all descriptors
// IN OPENGL/WEBGL, buffer and textures have the own binding range
// THEREFORE, Mg standard is not to overlap binding values between descriptors
// OTHERWISE, separate sets implementation (TODO) could be used to handle separate ranges
const uint NO_OF_RESERVED_BINDINGS = 5U;
var range = noOfSamplers - NO_OF_RESERVED_BINDINGS;
if (noOfSamplers < LOW_RES)
{
throw new InvalidOperationException("not enough combined samplers for pbr");
}
// pick between hi res and low res
bool isHighRes = (noOfSamplers >= HI_RES);
uint bindableImages = isHighRes ? 32U : 16U;
var elementRange = query.GetElementRange(
MgBufferUsageFlagBits.UNIFORM_BUFFER_BIT,
PBR_TEXTURES_PER_MATERIALS,
blockSize);
if (isHighRes)
{
// floor(no_of_samplers - reserved_slots / textures_per_mat) = floor((32 - 5)/5) = 5
if (elementRange < 5U)
{
throw new InvalidOperationException("hi res not applicable");
}
elementRange = 5U;
}
else
{
// floor(no_of_samplers - reserved_slots / textures_per_mat) = floor((16 - 5)/5) = 2
if (elementRange < 2U)
{
throw new InvalidOperationException("low res not applicable");
}
elementRange = 2U;
}
var noOfAllocations = (materials.Length / elementRange);
noOfAllocations += (materials.Length % elementRange == 0) ? 0 : 1;
var info = new MgStorageBlockAllocationInfo
{
Usage = MgBufferUsageFlagBits.UNIFORM_BUFFER_BIT,
MemoryPropertyFlags = MgMemoryPropertyFlagBits.HOST_VISIBLE_BIT,
Size = elementRange * blockSize,
};
var materialIndices = new int[noOfAllocations];
for (var i = 0; i < noOfAllocations; i += 1)
{
materialIndices[i] = dynamicRequest.Insert(info);
}
return(materialIndices);
}