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#4604 Reduce draw distance when low on RAM

master
Andrey Kleshchev 2025-08-29 00:02:04 +03:00 committed by Andrey Kleshchev
parent b246834207
commit e23aa06049
4 changed files with 72 additions and 18 deletions
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23
indra/newview/llviewermessage.cpp
View File

@ -3364,6 +3364,17 @@ void send_agent_update(bool force_send, bool send_reliable)
msg->addVector3Fast(_PREHASH_CameraUpAxis, LLViewerCamera::getInstance()->getUpAxis());
static F32 last_draw_disatance_step = 1024;
F32 memory_limited_draw_distance = gAgentCamera.mDrawDistance;
if (LLViewerTexture::sDesiredDiscardBias > 2.f && LLViewerTexture::isSystemMemoryLow())
{
// If we are low on memory, reduce requested draw distance
// Discard's bias is clamped to 4 so we need to check 2 to 4 range
// Factor is intended to go from 1.0 to 2.0
F32 factor = 1.f + (LLViewerTexture::sDesiredDiscardBias - 2.f) / 2.f;
memory_limited_draw_distance = llmax(gAgentCamera.mDrawDistance / factor, gAgentCamera.mDrawDistance / 2.f);
}
if (tp_state == LLAgent::TELEPORT_ARRIVING || LLStartUp::getStartupState() < STATE_MISC)
{
// Inform interest list, prioritize closer area.
@ -3372,25 +3383,25 @@ void send_agent_update(bool force_send, bool send_reliable)
// closer ones.
// Todo: revise and remove once server gets distance sorting.
last_draw_disatance_step = llmax((F32)(gAgentCamera.mDrawDistance / 2.f), 50.f);
last_draw_disatance_step = llmin(last_draw_disatance_step, memory_limited_draw_distance);
msg->addF32Fast(_PREHASH_Far, last_draw_disatance_step);
}
else if (last_draw_disatance_step < gAgentCamera.mDrawDistance)
else if (last_draw_disatance_step < memory_limited_draw_distance)
{
static LLFrameTimer last_step_time;
if (last_step_time.getElapsedTimeF32() > 1.f)
{
// gradually increase draw distance
// Idealy this should be not per second, but based on how loaded
// mesh thread is, but hopefully this is temporary.
last_step_time.reset();
F32 step = gAgentCamera.mDrawDistance * 0.1f;
last_draw_disatance_step = llmin(last_draw_disatance_step + step, gAgentCamera.mDrawDistance);
F32 step = memory_limited_draw_distance * 0.1f;
last_draw_disatance_step = llmin(last_draw_disatance_step + step, memory_limited_draw_distance);
}
msg->addF32Fast(_PREHASH_Far, last_draw_disatance_step);
}
else
{
msg->addF32Fast(_PREHASH_Far, gAgentCamera.mDrawDistance);
last_draw_disatance_step = memory_limited_draw_distance;
msg->addF32Fast(_PREHASH_Far, memory_limited_draw_distance);
}
msg->addU32Fast(_PREHASH_ControlFlags, control_flags);

51
indra/newview/llviewertexture.cpp
View File

@ -527,8 +527,16 @@ void LLViewerTexture::updateClass()
if (is_low && !was_low)
{
// slam to 1.5 bias the moment we hit low memory (discards off screen textures immediately)
sDesiredDiscardBias = llmax(sDesiredDiscardBias, 1.5f);
if (is_sys_low)
{
// Not having system memory is more serious, so discard harder
sDesiredDiscardBias = llmax(sDesiredDiscardBias, 1.5f * getSystemMemoryBudgetFactor());
}
else
{
// Slam to 1.5 bias the moment we hit low memory (discards off screen textures immediately)
sDesiredDiscardBias = llmax(sDesiredDiscardBias, 1.5f);
}
if (is_sys_low || over_pct > 2.f)
{ // if we're low on system memory, emergency purge off screen textures to avoid a death spiral
@ -559,8 +567,13 @@ void LLViewerTexture::updateClass()
sEvaluationTimer.reset();
// lower discard bias over time when at least 10% of budget is free
const F32 FREE_PERCENTAGE_TRESHOLD = -0.1f;
if (sDesiredDiscardBias > 1.f && over_pct < FREE_PERCENTAGE_TRESHOLD)
constexpr F32 FREE_PERCENTAGE_TRESHOLD = -0.1f;
constexpr U32 FREE_SYS_MEM_TRESHOLD = 100;
static LLCachedControl<U32> min_free_main_memory(gSavedSettings, "RenderMinFreeMainMemoryThreshold", 512);
const S32Megabytes MIN_FREE_MAIN_MEMORY(min_free_main_memory() + FREE_SYS_MEM_TRESHOLD);
if (sDesiredDiscardBias > 1.f
&& over_pct < FREE_PERCENTAGE_TRESHOLD
&& getFreeSystemMemory() > MIN_FREE_MAIN_MEMORY)
{
static LLCachedControl<F32> high_mem_discard_decrement(gSavedSettings, "RenderHighMemMinDiscardDecrement", .1f);
@ -627,24 +640,42 @@ void LLViewerTexture::updateClass()
}
//static
bool LLViewerTexture::isSystemMemoryLow()
U32Megabytes LLViewerTexture::getFreeSystemMemory()
{
static LLFrameTimer timer;
static U32Megabytes physical_res = U32Megabytes(U32_MAX);
static LLCachedControl<U32> min_free_main_memory(gSavedSettings, "RenderMinFreeMainMemoryThreshold", 512);
const U32Megabytes MIN_FREE_MAIN_MEMORY(min_free_main_memory);
if (timer.getElapsedTimeF32() < MEMORY_CHECK_WAIT_TIME) //call this once per second.
{
return physical_res < MIN_FREE_MAIN_MEMORY;
return physical_res;
}
timer.reset();
LLMemory::updateMemoryInfo();
physical_res = LLMemory::getAvailableMemKB();
return physical_res < MIN_FREE_MAIN_MEMORY;
return physical_res;
}
//static
bool LLViewerTexture::isSystemMemoryLow()
{
static LLCachedControl<U32> min_free_main_memory(gSavedSettings, "RenderMinFreeMainMemoryThreshold", 512);
const U32Megabytes MIN_FREE_MAIN_MEMORY(min_free_main_memory);
return getFreeSystemMemory() < MIN_FREE_MAIN_MEMORY;
}
F32 LLViewerTexture::getSystemMemoryBudgetFactor()
{
static LLCachedControl<U32> min_free_main_memory(gSavedSettings, "RenderMinFreeMainMemoryThreshold", 512);
const S32Megabytes MIN_FREE_MAIN_MEMORY(min_free_main_memory);
S32 free_budget = (S32Megabytes)getFreeSystemMemory() - MIN_FREE_MAIN_MEMORY;
if (free_budget < 0)
{
// Result should range from 1 (0 free budget) to 2 (-512 free budget)
return 1.f - free_budget / MIN_FREE_MAIN_MEMORY;
}
return 1.f;
}
//end of static functions

3
indra/newview/llviewertexture.h
View File

@ -115,6 +115,7 @@ public:
static void initClass();
static void updateClass();
static bool isSystemMemoryLow();
static F32 getSystemMemoryBudgetFactor();
LLViewerTexture(bool usemipmaps = true);
LLViewerTexture(const LLUUID& id, bool usemipmaps) ;
@ -189,6 +190,8 @@ private:
friend class LLBumpImageList;
friend class LLUIImageList;
static U32Megabytes getFreeSystemMemory();
protected:
friend class LLViewerTextureList;
LLUUID mID;

13
indra/newview/llvocache.cpp
View File

@ -486,14 +486,23 @@ void LLVOCacheEntry::updateDebugSettings()
//min radius: all objects within this radius remain loaded in memory
static LLCachedControl<F32> min_radius(gSavedSettings,"SceneLoadMinRadius");
static const F32 MIN_RADIUS = 1.0f;
const F32 draw_radius = gAgentCamera.mDrawDistance;
F32 draw_radius = gAgentCamera.mDrawDistance;
if (LLViewerTexture::sDesiredDiscardBias > 2.f && LLViewerTexture::isSystemMemoryLow())
{
// Discard's bias maximum is 4 so we need to check 2 to 4 range
// Factor is intended to go from 1.0 to 2.0
F32 factor = 1.f + (LLViewerTexture::sDesiredDiscardBias - 2.f) / 2.f;
// For safety cap reduction at 50%, we don't want to go below half of draw distance
draw_radius = llmax(draw_radius / factor, draw_radius / 2.f);
}
const F32 clamped_min_radius = llclamp((F32) min_radius, MIN_RADIUS, draw_radius); // [1, mDrawDistance]
sNearRadius = MIN_RADIUS + ((clamped_min_radius - MIN_RADIUS) * adjust_factor);
// a percentage of draw distance beyond which all objects outside of view frustum will be unloaded, regardless of pixel threshold
static LLCachedControl<F32> rear_max_radius_frac(gSavedSettings,"SceneLoadRearMaxRadiusFraction");
const F32 min_radius_plus_one = sNearRadius + 1.f;
const F32 max_radius = rear_max_radius_frac * gAgentCamera.mDrawDistance;
const F32 max_radius = rear_max_radius_frac * draw_radius;
const F32 clamped_max_radius = llclamp(max_radius, min_radius_plus_one, draw_radius); // [sNearRadius, mDrawDistance]
sRearFarRadius = min_radius_plus_one + ((clamped_max_radius - min_radius_plus_one) * adjust_factor);