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Code Issues 157 Wiki Activity

Draw instances from the GPU culling with indirect draws, occlusion culling and a depth prepass

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Hirek
2026-10-16 12:54:52 +02:00
parent 2f0a06b98e
commit 466cb5339e
23 changed files with 1002 additions and 32 deletions
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22
rendering/geometrybank.h
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@@ -61,6 +61,16 @@ struct stream_units {
using basic_index = std::uint32_t;
// where a chunk lies in the buffers of its bank, for an indirect draw command made on the cpu: count of indices (or of
// vertices), first index (or vertex), base vertex, whether the draw is indexed, and the primitive type
struct indirect_source {
std::uint32_t count { 0 };
std::uint32_t first { 0 };
std::int32_t basevertex { 0 };
bool indexed { false };
unsigned int type { 0 };
};
using vertex_array = std::vector<basic_vertex>;
using userdata_array = std::vector<vertex_userdata>;
using index_array = std::vector<basic_index>;
@@ -123,6 +133,11 @@ public:
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;
// makes the data of specified chunk ready for drawing and tells where it lies. returns: false if there's nothing to draw
auto indirect_source( gfx::geometry_handle const &Geometry, gfx::indirect_source &Source ) -> bool;
// draws geometry stored in specified chunk with the command at Offset (bytes) in the bound draw indirect buffer,
// a glDrawElementsIndirect one for an indexed chunk, glDrawArraysIndirect otherwise
void draw_indirect( gfx::geometry_handle const &Geometry, std::intptr_t const Offset, unsigned int const Streams = basic_streams );
// draws geometry stored in supplied list of chunks
template <typename Iterator_>
auto draw( Iterator_ First, Iterator_ Last, gfx::stream_units const &Units, unsigned int const Streams = basic_streams ) ->std::size_t {
@@ -194,6 +209,9 @@ private:
std::size_t count { 0 };
for( ; First != Last; ++First ) { count += draw_( *First, Units, Streams ); }
return count; }
// indirect_source() and draw_indirect() subclass details. by default the bank can't draw indirectly
virtual auto indirect_source_( gfx::geometry_handle const & /*Geometry*/, gfx::indirect_source & /*Source*/ ) -> bool { return false; }
virtual void draw_indirect_( gfx::geometry_handle const & /*Geometry*/, std::intptr_t const /*Offset*/, unsigned int const /*Streams*/ ) {}
// resource release subclass details
virtual void release_() = 0;
};
@@ -227,6 +245,10 @@ public:
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 );
// makes the data of specified chunk ready for an indirect draw and tells where it lies. returns: false if there's nothing to draw
auto indirect_source( gfx::geometry_handle const &Geometry, gfx::indirect_source &Source ) -> bool;
// draws geometry stored in specified chunk with the command at Offset (bytes) in the bound draw indirect buffer
void draw_indirect( gfx::geometry_handle const &Geometry, std::intptr_t const Offset, unsigned int const Streams = basic_streams );
template <typename Iterator_>
void draw( Iterator_ First, Iterator_ Last, unsigned int const Streams = basic_streams ) {
while( First != Last ) {