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Draw: Add default material fallback detection #121137

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Miguel Pozo merged 5 commits from pragma37/blender:pull-is-default-material into main 2024-04-30 19:44:16 +02:00
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Miguel Pozo commented 2024-04-26 17:32:54 +02:00
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Detect passes that are functionally equivalent to the default Material ones to skip their compilation.

Material compilation times on scene load (after clearing shader cache):

Mr. Elephant (Before) : 30s
Mr. Elephant (After)  : 20s

Barbershop (Before) : 2m:40s
Barbershop (After)  : 2m:15s
Detect passes that are functionally equivalent to the default Material ones to skip their compilation. Material compilation times on scene load (after clearing shader cache): ``` Mr. Elephant (Before) : 30s Mr. Elephant (After) : 20s Barbershop (Before) : 2m:40s Barbershop (After) : 2m:15s ```
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Miguel Pozo added 1 commit 2024-04-26 17:33:06 +02:00
Miguel Pozo added 1 commit 2024-04-29 15:54:00 +02:00
Miguel Pozo changed title from WIP: Draw: Add default material fallback detection to Draw: Add default material fallback detection 2024-04-29 15:54:08 +02:00
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Miguel Pozo requested review from Clément Foucault 2024-04-29 15:54:33 +02:00
Clément Foucault approved these changes 2024-04-30 10:54:11 +02:00
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Clément Foucault requested changes 2024-04-30 10:59:04 +02:00
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The only thing not clear about this approach is that it doesn't create a GPUMaterial nor communicate the engine that the shader is redundant. Thus, the shader will still try to compile each frame (and be discarded each frame, but you pay the cost of the nodetree parsing).

Can you check if that's the case? and if it is, maybe have a dedicated flag on the GPUMaterial to denote this case.

The only thing not clear about this approach is that it doesn't create a GPUMaterial nor communicate the engine that the shader is redundant. Thus, the shader will still try to compile each frame (and be discarded each frame, but you pay the cost of the nodetree parsing). Can you check if that's the case? and if it is, maybe have a dedicated flag on the GPUMaterial to denote this case.
Miguel Pozo added 2 commits 2024-04-30 17:01:26 +02:00
Miguel Pozo commented 2024-04-30 17:04:46 +02:00
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The way to communicate to the engine that it should use the default pass was returning a null GPUMaterial, but you're right that this caused to re-evaluate the node tree each frame (I forgot the EEVEE material/shader maps are rebuilt every frame).

The way to communicate to the engine that it should use the default pass was returning a null `GPUMaterial`, but you're right that this caused to re-evaluate the node tree each frame (I forgot the EEVEE material/shader maps are rebuilt every frame).
Miguel Pozo added 1 commit 2024-04-30 17:07:43 +02:00
Clément Foucault requested changes 2024-04-30 17:08:23 +02:00
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source/blender/draw/engines/eevee_next/eevee_shader.cc
@ -767,0 +799,4 @@
eMaterialGeometry geometry_type)
{
bool is_volume = ELEM(pipeline_type, MAT_PIPE_VOLUME_MATERIAL, MAT_PIPE_VOLUME_OCCUPANCY);
::Material *blender_mat = (is_volume) ? BKE_material_default_volume() :
Clément Foucault commented 2024-04-30 17:08:13 +02:00
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BKE_material_default_volume is only for volume object. I think this is also an error in the existing code.

`BKE_material_default_volume` is only for volume object. I think this is also an error in the existing code.
Miguel Pozo commented 2024-04-30 17:21:04 +02:00
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This is literally the same code that was already there, just moved to a re-usable function.
can_use_default is never true for volume pipelines, so this shouldn't introduce any new issues.
If there's an issue with the already existing code, I think that should be properly checked and fixed outside this PR.

This is literally the same code that was already there, just moved to a re-usable function. `can_use_default` is never true for volume pipelines, so this shouldn't introduce any new issues. If there's an issue with the already existing code, I think that should be properly checked and fixed outside this PR.
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Clément Foucault approved these changes 2024-04-30 18:54:21 +02:00
Miguel Pozo merged commit a8f8745dcb into main 2024-04-30 19:44:16 +02:00
Miguel Pozo deleted branch pull-is-default-material 2024-04-30 19:44:19 +02:00
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