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Cycles: Disable NanoVDB if not needed when specialising Metal PSOs

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This patch adds a check to see whether we're actually using NanoVDB textures, and if not, removes `#define WITH_NANOVDB` when generating the scene-optimised kernels. This results in marginally faster render times (maybe 2 or 3%) for scenes that do not use NanoVDB. The generic kernels are unaffected, so this will not impact responsiveness on first render.

Pull Request: https://projects.blender.org/blender/blender/pulls/112822
This commit is contained in:
Michael Jones 2023-10-31 13:34:46 +00:00 • committed by Michael Jones (Apple)
parent 5c34161a3f
commit ddff3680e2
2 changed files with 12 additions and 1 deletions
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1
intern/cycles/device/metal/device_impl.h
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@ -46,6 +46,7 @@ class MetalDevice : public Device {
MetalGPUVendor device_vendor;
uint kernel_features;
bool using_nanovdb = false;
MTLResourceOptions default_storage_mode;
int max_threads_per_threadgroup;

12
intern/cycles/device/metal/device_impl.mm
View file

@ -345,7 +345,9 @@ string MetalDevice::preprocess_source(MetalPipelineType pso_type,
case METAL_GPU_APPLE:
global_defines += "#define __KERNEL_METAL_APPLE__\n";
# ifdef WITH_NANOVDB
if (DebugFlags().metal.use_nanovdb) {
/* Compiling in NanoVDB results in a marginal drop in render perf, so disable it for
* specialized PSOs when no textures are using it. */
if ((pso_type == PSO_GENERIC || using_nanovdb) && DebugFlags().metal.use_nanovdb) {
global_defines += "#define WITH_NANOVDB\n";
}
# endif
@ -1079,6 +1081,14 @@ void MetalDevice::tex_alloc_as_buffer(device_texture &mem)
texture_info[slot].data = *(uint64_t *)((uint64_t)buffer_bindings_1d.contents + offset);
texture_slot_map[slot] = nil;
need_texture_info = true;
if (mem.info.data_type == IMAGE_DATA_TYPE_NANOVDB_FLOAT ||
mem.info.data_type == IMAGE_DATA_TYPE_NANOVDB_FLOAT3 ||
mem.info.data_type == IMAGE_DATA_TYPE_NANOVDB_FPN ||
mem.info.data_type == IMAGE_DATA_TYPE_NANOVDB_FP16)
{
using_nanovdb = true;
}
}
void MetalDevice::tex_alloc(device_texture &mem)