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Refactor tonemap blending to preserve HDR detail during mix
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The blending operation for the `tonemap_mix` uniform in `postDeferredTonemap.glsl` incorrectly used a prematurely clamped color value as the source for the linear mix target. Specifically, the exposed HDR input color was clamped to the [0, 1] LDR range before being used in the `mix()` function when `tonemap_mix < 1.0`.
This premature clamping resulted in the loss of High Dynamic Range (HDR) detail in highlights during the blend operation. As `tonemap_mix` was reduced, instead of smoothly blending towards the linear scene representation, clipped highlights were incorrectly reintroduced.
This commit modifies the `toneMap` and `toneMapNoExposure` functions to correct this logic:
1. The original linear input color is preserved before exposure/processing.
2. The appropriate exposure factor is calculated and applied separately.
3. The chosen tone mapping operator is applied to the exposed color, storing the result.
4. The `mix()` function now correctly blends between the appropriately scaled, *unclamped* linear input color and the fully tone-mapped result.
5. The final clamp to the [0, 1] LDR range is applied *after* the blend operation.
This change ensures that HDR information is preserved throughout the blending process, resulting in a smoother, more perceptually correct visual transition as `tonemap_mix` is adjusted. While the effect is nuanced, it is noticeable in bright highlights; with the legacy code, these highlights appeared visibly clipped and less intense during the blend, whereas the corrected code allows them to retain their peak brightness and detail more accurately. This makes the `tonemap_mix` control more intuitive, behaving as a true intensity blend for the tone mapping effect without introducing clipping artifacts. The computational cost is negligible.
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New optimisation and resolution shadow options
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* #3409 Make probe count adjustable to better accomodate low VRAM scenarios
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#3663 On AMD, the world may be rendered in really strange colors.
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* Incorporation of feedback for #3456
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2024.09-ExtraFPS
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2024.09-ExtraFPS
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* #3103 Add the ability to disable the emissive buffer for older GPUs with low memory bandwidth.
* #3135 Add a "vintage" mode for slower GPUs
* #2719 Fix for skies being overbrightened
* #2632 Do not apply tonemapping on legacy skies
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2024.09-ExtraFPS
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* Partial solution to secondlife/viewer#2744 crash with better error handling.
Handles shader compile errors better, and should turn crash into an LL_ERRS assertion failure.
Strengthed more assertions and improved shader error line numbers
* Even more error handling to get a handle on crash secondlife/viewer#2744
* Improved GLSL correctness on Intel chips that lack OpenGL 4.6 support. secondlife/viewer#2744
* Removed non-working fallback code for gDeferredPostProgram
* Fixed incorrect llmax call
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2024.09-ExtraFPS
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* OpenGL 3.3 compatibility pass. Fix for FBO driven downscaling corrupting textures.
* Increase maximum texture bias, immediately scale down when textures are loaded higher resolution than desired
* #2590 Fix for some frame stalls on Intel Macs
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2024.09-ExtraFPS
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2024.08-DeltaFPS
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functions (#2488)
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2024.08-DeltaFPS
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to control tonemap mix (#2464) (#2468)
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Add SMAA buffer generation passes
Add quality levels for both FXAA and SMAA
Separate gamma correction and tonemapping for effects that require linear-but-tonemapped inputs
Move application of noise to final render pass to screen to avoid damaging other post process effects
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Adds gather4 support under GLSL 4.0+
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2024.06-atlasaurus
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secondlife/viewer#1847: Fix negative UV scale inverting normal texture lighting for PBR materials and PBR terrain
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materials and PBR terrain
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* #1836 Texture memory usage overhaul. Much decrufting
- don't keep a copy of textures in system memory
- use GPU to downrez textures instead of reloading from cache
- use GPU to generate brightness/darkness bumpmaps
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* #1736 Remove some unused samplers from glsl files and refactor shader manager to assume 16 texture image units and 4 indexed texture units all the time.
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# Conflicts:
# .github/workflows/build.yaml
# indra/newview/app_settings/shaders/class2/deferred/alphaF.glsl
# indra/newview/app_settings/shaders/class3/deferred/reflectionProbeF.glsl
# indra/newview/app_settings/shaders/class3/deferred/softenLightF.glsl
# indra/newview/llfilepicker.cpp
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project/gltf_development
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DRTVWR-600-maint-A
# Conflicts:
# indra/llappearance/llavatarappearance.h
# indra/llimage/llimage.cpp
# indra/llmath/llvolume.cpp
# indra/llmath/llvolume.h
# indra/llprimitive/llgltfmaterial.h
# indra/llrender/llrendertarget.cpp
# indra/llrender/llshadermgr.cpp
# indra/newview/lldynamictexture.cpp
# indra/newview/llenvironment.cpp
# indra/newview/llfetchedgltfmaterial.cpp
# indra/newview/llfloaterimagepreview.cpp
# indra/newview/llfloaterimagepreview.h
# indra/newview/llfloaterregioninfo.cpp
# indra/newview/llfloaterregioninfo.h
# indra/newview/llmaniprotate.cpp
# indra/newview/llmaniptranslate.cpp
# indra/newview/llpanelvolume.cpp
# indra/newview/llselectmgr.cpp
# indra/newview/llselectmgr.h
# indra/newview/llsurface.cpp
# indra/newview/llsurface.h
# indra/newview/llsurfacepatch.cpp
# indra/newview/lltexturectrl.cpp
# indra/newview/lltexturectrl.h
# indra/newview/lltinygltfhelper.cpp
# indra/newview/llviewertexture.cpp
# indra/newview/llviewerwindow.cpp
# indra/newview/llviewerwindow.h
# indra/newview/llvlcomposition.cpp
# indra/newview/llvlcomposition.h
# indra/newview/llvocache.cpp
# indra/newview/llvovolume.cpp
# indra/newview/pipeline.cpp
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source for viewer 7.1.8.9375512768
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project/gltf_development
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project/gltf_development
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Co-authored-by: Dave Parks <davep@lindenlab.com>
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