godotengine/godot
1
0
Fork 0
mirror of https://github.com/godotengine/godot.git synced 2025-11-04 12:00:25 +00:00
Code Releases Wiki Activity

Optimize glow and tonemap gather step in the mobile renderer

Browse Source 
Mobile devices are typically bandwidth bound which means we need to do as few texture samples as possible.

They typically use TBDR GPUs which means that all rendering takes place on special optimized tiles. As a side effect, reading back memory from tile to VRAM is really slow, especially on Mali devices.

This commit uses a technique where you do a small blur while downsampling, and then another small blur while upsampling to get really high quality glow. While this doesn't reduce the renderpass count very much, it does reduce the texture read bandwidth by almost 10 times. Overall glow was more texture-read bound than memory write, bound, so this was a huge win.

A side effect of this new technique is that we can gather the glow as we upsample instead of gathering the glow in the final tonemap pass. Doing so allows us to significantly reduce the cost of the tonemap pass as well.
This commit is contained in:
clayjohn
2025-09-01 14:43:37 -07:00
parent 084d5d407e
commit 2e59cb41f4
22 changed files with 1524 additions and 519 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gles3/rasterizer_scene_gles3.cpp
View File

@@ -2814,7 +2814,7 @@ void RasterizerSceneGLES3::_render_post_processing(const RenderDataGLES3 *p_rend
bool glow_enabled = false;
float glow_intensity = 1.0;
float glow_bloom = 0.0;
float glow_hdr_bleed_threshold = 1.0;
float glow_hdr_bleed_threshold = 0.0;
float glow_hdr_bleed_scale = 2.0;
float glow_hdr_luminance_cap = 12.0;
float srgb_white = 1.0;