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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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52
rendering/opengl46/opengl46geometrybank.cpp
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@@ -222,6 +222,58 @@ opengl46_vaogeometrybank::draw_instanced_( gfx::geometry_handle const &Geometry,
return prims * InstanceCount;
}
// indirect_source() subclass details — the chunk is uploaded first if needed, as by a draw, so that an indirect draw
// command made from what this tells finds it in place
bool
opengl46_vaogeometrybank::indirect_source_( gfx::geometry_handle const &Geometry, gfx::indirect_source &Source )
{
setup_buffer();
auto &chunkrecord = m_chunkrecords.at(Geometry.chunk - 1);
if( chunkrecord.vertex_count == 0 ) { return false; }
auto const &chunk = gfx::geometry_bank::chunk( Geometry );
if( !chunkrecord.is_good ) {
m_vao->bind();
if( chunkrecord.index_count > 0 ) {
m_indexbuffer->upload( gl::buffer::ELEMENT_ARRAY_BUFFER, chunk.indices.data(), chunkrecord.index_offset * sizeof( gfx::basic_index ), chunkrecord.index_count * sizeof( gfx::basic_index ) );
}
m_vertexbuffer->upload( gl::buffer::ARRAY_BUFFER, chunk.vertices.data(), chunkrecord.vertex_offset * sizeof( gfx::basic_vertex ), chunkrecord.vertex_count * sizeof( gfx::basic_vertex ) );
if( chunkrecord.has_userdata ) {
m_vertexbuffer->upload( gl::buffer::ARRAY_BUFFER, chunk.userdata.data(),
static_cast<int>(m_vertex_count * sizeof(gfx::basic_vertex) + chunkrecord.vertex_offset * sizeof(gfx::vertex_userdata)),
static_cast<int>(chunkrecord.vertex_count * sizeof(gfx::vertex_userdata)) );
}
chunkrecord.is_good = true;
}
Source.indexed = ( chunkrecord.index_count > 0 );
Source.count = static_cast<std::uint32_t>( Source.indexed ? chunkrecord.index_count : chunkrecord.vertex_count );
Source.first = static_cast<std::uint32_t>( Source.indexed ? chunkrecord.index_offset : chunkrecord.vertex_offset );
Source.basevertex = static_cast<std::int32_t>( Source.indexed ? chunkrecord.vertex_offset : 0 );
Source.type = chunk.type;
return true;
}
// draw_indirect() subclass details — the command comes from the bound draw indirect buffer
void
opengl46_vaogeometrybank::draw_indirect_( gfx::geometry_handle const &Geometry, std::intptr_t const Offset, unsigned int const /*Streams*/ )
{
setup_buffer();
auto const &chunkrecord = m_chunkrecords.at(Geometry.chunk - 1);
if( chunkrecord.vertex_count == 0 ) { return; }
auto const &chunk = gfx::geometry_bank::chunk( Geometry );
m_vao->bind();
if( chunkrecord.index_count > 0 ) {
::glDrawElementsIndirect( chunk.type, GL_UNSIGNED_INT, reinterpret_cast<void const *>( Offset ) );
}
else {
::glDrawArraysIndirect( chunk.type, reinterpret_cast<void const *>( Offset ) );
}
}
// draw_batch() subclass details — neighbouring non-indexed chunks of the same type are sent with a single GL call.
// The chunks are drawn in the supplied order, same as with a draw_() call for each of them.
std::size_t