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Distribute shadow map update over multiple frames to reduce stutter (#11422)

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Reduces stutter and freezes when playing.

 * Maintains double SM and SM Color textures
 * Light frustum update triggers incremental generation of shadow map into secondary 'future' textures.
 * Every incremental update renders a portion of the shadow draw list (split equally).
 * After defined number of frames (currently, 4), 'future' and 'current' textures are swapped, and DirectionalLight 'commits' the new frustum to use when rendering shadows on screen.

Co-authored-by: sfan5 <sfan5@live.de>
This commit is contained in:
x2048 2021-07-25 12:36:23 +02:00 • committed by GitHub
parent ff2d2a6e93
commit bf3acbf388
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GPG key ID: 4AEE18F83AFDEB23
10 changed files with 224 additions and 72 deletions
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25
src/client/clientmap.cpp
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@ -636,7 +636,7 @@ void ClientMap::PrintInfo(std::ostream &out)
}
void ClientMap::renderMapShadows(video::IVideoDriver *driver,
const video::SMaterial &material, s32 pass)
const video::SMaterial &material, s32 pass, int frame, int total_frames)
{
bool is_transparent_pass = pass != scene::ESNRP_SOLID;
std::string prefix;
@ -650,7 +650,23 @@ void ClientMap::renderMapShadows(video::IVideoDriver *driver,
MeshBufListList drawbufs;
int count = 0;
int low_bound = is_transparent_pass ? 0 : m_drawlist_shadow.size() / total_frames * frame;
int high_bound = is_transparent_pass ? m_drawlist_shadow.size() : m_drawlist_shadow.size() / total_frames * (frame + 1);
// transparent pass should be rendered in one go
if (is_transparent_pass && frame != total_frames - 1) {
return;
}
for (auto &i : m_drawlist_shadow) {
// only process specific part of the list & break early
++count;
if (count <= low_bound)
continue;
if (count > high_bound)
break;
v3s16 block_pos = i.first;
MapBlock *block = i.second;
@ -705,6 +721,7 @@ void ClientMap::renderMapShadows(video::IVideoDriver *driver,
local_material.MaterialType = material.MaterialType;
local_material.BackfaceCulling = material.BackfaceCulling;
local_material.FrontfaceCulling = material.FrontfaceCulling;
local_material.BlendOperation = material.BlendOperation;
local_material.Lighting = false;
driver->setMaterial(local_material);
@ -720,6 +737,12 @@ void ClientMap::renderMapShadows(video::IVideoDriver *driver,
}
}
// restore the driver material state
video::SMaterial clean;
clean.BlendOperation = video::EBO_ADD;
driver->setMaterial(clean); // reset material to defaults
driver->draw3DLine(v3f(), v3f(), video::SColor(0));
g_profiler->avg(prefix + "draw meshes [ms]", draw.stop(true));
g_profiler->avg(prefix + "vertices drawn [#]", vertex_count);
g_profiler->avg(prefix + "drawcalls [#]", drawcall_count);