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Code Issues 156 Wiki Activity

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

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This commit is contained in:
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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11
rendering/opengl46/opengl46geometrybank.cpp
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@@ -171,9 +171,9 @@ opengl46_vaogeometrybank::draw_( gfx::geometry_handle const &Geometry, gfx::stre
}
// draw_instanced() subclass details — single GL instanced draw for InstanceCount instances.
// The vertex shader reads per-instance modelview from instance_ubo[gl_InstanceID].
// The vertex shader reads per-instance modelview from instance_ssbo[gl_BaseInstance + gl_InstanceID].
std::size_t
opengl46_vaogeometrybank::draw_instanced_( gfx::geometry_handle const &Geometry, gfx::stream_units const &Units, std::size_t const InstanceCount, unsigned int const Streams )
opengl46_vaogeometrybank::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 )
{
setup_buffer();
@@ -199,16 +199,17 @@ opengl46_vaogeometrybank::draw_instanced_( gfx::geometry_handle const &Geometry,
if( chunkrecord.index_count > 0 ) {
m_vao->bind();
::glDrawElementsInstancedBaseVertex(
::glDrawElementsInstancedBaseVertexBaseInstance(
chunk.type,
chunkrecord.index_count, GL_UNSIGNED_INT,
reinterpret_cast<void const *>( chunkrecord.index_offset * sizeof( gfx::basic_index ) ),
inst_count,
chunkrecord.vertex_offset );
chunkrecord.vertex_offset,
BaseInstance );
}
else {
m_vao->bind();
::glDrawArraysInstanced( chunk.type, chunkrecord.vertex_offset, chunkrecord.vertex_count, inst_count );
::glDrawArraysInstancedBaseInstance( chunk.type, chunkrecord.vertex_offset, chunkrecord.vertex_count, inst_count, BaseInstance );
}
auto const vertexcount { ( chunkrecord.index_count > 0 ? chunkrecord.index_count : chunkrecord.vertex_count ) };