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Fix #124038: Performance issue with color sampling in 3D Viewport #126072

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Lukas Stockner merged 1 commits from LukasStockner/blender:colorpicker-3dview into main 2024-08-12 14:52:46 +02:00
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Lukas Stockner commented 2024-08-08 02:25:50 +02:00
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The issue here is that copying the GPU viewport back to the CPU is an expensive
operation, so doing it for every frame when dragging the eyedropper is not ideal.

Instead, copy it once at the start and keep reading from it until the user
releases the eyedropper.

The issue here is that copying the GPU viewport back to the CPU is an expensive operation, so doing it for every frame when dragging the eyedropper is not ideal. Instead, copy it once at the start and keep reading from it until the user releases the eyedropper.
Lukas Stockner added this to the User Interface project 2024-08-08 02:26:05 +02:00
Lukas Stockner requested review from Clément Foucault 2024-08-08 02:26:14 +02:00
Hans Goudey reviewed 2024-08-08 03:11:03 +02:00
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Just reading out of curiosity and added a few small comments.

Just reading out of curiosity and added a few small comments.
source/blender/editors/include/ED_view3d.hh Outdated
@ -892,1 +892,3 @@
bool ED_view3d_viewport_color_sample(ARegion *region, const int mval[2], float r_col[3]);
class ViewportColorSampleSession {
public:
ViewportColorSampleSession() {}
Hans Goudey commented 2024-08-08 03:10:44 +02:00
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ViewportColorSampleSession() = default; is the more canonical way to write this I think

`ViewportColorSampleSession() = default;` is the more canonical way to write this I think
source/blender/editors/include/ED_view3d.hh Outdated
@ -893,0 +898,4 @@
bool sample(const int mval[2], float r_col[3]);
protected:
GPUTexture *tex = nullptr;
Hans Goudey commented 2024-08-08 03:08:36 +02:00
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Typically class variables come first in the declaration:
https://developer.blender.org/docs/handbook/guidelines/c_cpp/#class-layout

Typically class variables come first in the declaration: https://developer.blender.org/docs/handbook/guidelines/c_cpp/#class-layout
source/blender/editors/space_view3d/view3d_draw.cc Outdated
@ -2743,2 +2743,3 @@
GPU_texture_copy(copy_tx, color_tx);
GPU_texture_copy(tex, color_tex);
GPU_memory_barrier(GPU_BARRIER_TEXTURE_UPDATE);
data = (blender::ushort4 *)GPU_texture_read(tex, GPU_DATA_HALF_FLOAT, 0);
Hans Goudey commented 2024-08-08 03:09:42 +02:00
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Use C++ style casts
https://developer.blender.org/docs/handbook/guidelines/c_cpp/#c-type-cast

Use C++ style casts https://developer.blender.org/docs/handbook/guidelines/c_cpp/#c-type-cast
Lukas Stockner force-pushed colorpicker-3dview from d062a245a4 to ab031d958d 2024-08-08 03:37:18 +02:00 Compare
Clément Foucault approved these changes 2024-08-12 14:50:19 +02:00
Lukas Stockner merged commit d8f550875b into main 2024-08-12 14:52:46 +02:00
Lukas Stockner deleted branch colorpicker-3dview 2024-08-12 14:52:50 +02:00
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