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Code Issues 147 Wiki Activity

Cull instances by compact records and draw them from a shader storage buffer

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Hirek
2026-10-16 00:37:54 +02:00
parent fd98d4eea5
commit 9277c28805
13 changed files with 269 additions and 228 deletions
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10
rendering/geometrybank.h
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@@ -119,8 +119,8 @@ public:
auto append( gfx::vertex_array &Vertices, gfx::userdata_array& Userdata, gfx::geometry_handle const &Geometry ) -> bool;
// draws geometry stored in specified chunk
auto draw( gfx::geometry_handle const &Geometry, gfx::stream_units const &Units, unsigned int const Streams = basic_streams ) -> std::size_t;
// draws geometry stored in specified chunk N times via glDrawElementsInstanced*
auto draw_instanced( gfx::geometry_handle const &Geometry, gfx::stream_units const &Units, std::size_t const InstanceCount, unsigned int const Streams = basic_streams ) -> std::size_t;
// draws geometry stored in specified chunk N times via glDrawElementsInstanced*, as instances BaseInstance and onwards
auto draw_instanced( gfx::geometry_handle const &Geometry, gfx::stream_units const &Units, std::size_t const InstanceCount, std::uint32_t const BaseInstance, unsigned int const Streams = basic_streams ) -> std::size_t;
// draws geometry stored in supplied sequence of chunks of the bank, in their order. the bank is free to combine them into fewer draw calls
auto draw_batch( gfx::geometry_handle const *First, gfx::geometry_handle const *Last, gfx::stream_units const &Units, unsigned int const Streams = basic_streams ) -> std::size_t;
// draws geometry stored in supplied list of chunks
@@ -185,7 +185,7 @@ private:
// draw() subclass details
virtual auto draw_( gfx::geometry_handle const &Geometry, gfx::stream_units const &Units, unsigned int const Streams ) -> std::size_t = 0;
// draw_instanced() subclass details. Default implementation falls back to N regular draws.
virtual auto draw_instanced_( gfx::geometry_handle const &Geometry, gfx::stream_units const &Units, std::size_t const InstanceCount, unsigned int const Streams ) -> std::size_t {
virtual auto draw_instanced_( gfx::geometry_handle const &Geometry, gfx::stream_units const &Units, std::size_t const InstanceCount, std::uint32_t const BaseInstance, unsigned int const Streams ) -> std::size_t {
std::size_t count { 0 };
for( std::size_t i = 0; i < InstanceCount; ++i ) { count += draw_( Geometry, Units, Streams ); }
return count; }
@@ -223,8 +223,8 @@ public:
// draws geometry stored in specified chunk
void draw( gfx::geometry_handle const &Geometry, unsigned int const Streams = basic_streams );
// draws geometry stored in specified chunk InstanceCount times via GPU instancing.
// The shader reads per-instance modelview matrices from instance_ubo[gl_InstanceID].
void draw_instanced( gfx::geometry_handle const &Geometry, std::size_t const InstanceCount, unsigned int const Streams = basic_streams );
// The shader reads per-instance modelview matrices from instance_ssbo[gl_BaseInstance + gl_InstanceID].
void draw_instanced( gfx::geometry_handle const &Geometry, std::size_t const InstanceCount, std::uint32_t const BaseInstance, unsigned int const Streams = basic_streams );
// draws geometry stored in supplied sequence of chunks, in their order. neighbouring chunks of the same bank are passed to it together
void draw_batch( gfx::geometry_handle const *First, gfx::geometry_handle const *Last, unsigned int const Streams = basic_streams );
template <typename Iterator_>