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Code Issues 154 Wiki Activity

perf(tracks): geometry of neighbouring tracks of a cell which share the material drawn together, with one material bind and one upload of model data; chunks of the same geometry bank sent to the gpu in a single multi draw call

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Hirek
2026-10-07 17:13:32 +02:00
parent 398fdac6a1
commit e335b89fcb
6 changed files with 165 additions and 16 deletions
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60
rendering/opengl33geometrybank.cpp
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@@ -259,6 +259,66 @@ opengl33_vaogeometrybank::draw_instanced_( gfx::geometry_handle const &Geometry,
return prims * InstanceCount;
}
// 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
opengl33_vaogeometrybank::draw_batch_( gfx::geometry_handle const *First, gfx::geometry_handle const *Last, gfx::stream_units const &Units, unsigned int const Streams )
{
std::size_t count { 0 };
if( !glMultiDrawArrays ) {
// GLES context doesn't provide the call
for( ; First != Last; ++First ) { count += draw_( *First, Units, Streams ); }
return count;
}
setup_buffer();
std::array<GLint, 64> offsets;
std::array<GLsizei, 64> sizes;
GLsizei pending { 0 };
unsigned int pendingtype { 0 };
auto const flush = [ & ]() {
if( pending == 0 ) { return; }
m_vao->bind();
if( pending == 1 ) { ::glDrawArrays( pendingtype, offsets[ 0 ], sizes[ 0 ] ); }
else { ::glMultiDrawArrays( pendingtype, offsets.data(), sizes.data(), pending ); }
pending = 0;
};
for( ; First != Last; ++First ) {
auto const &chunkrecord = m_chunkrecords.at( First->chunk - 1 );
if( ( false == chunkrecord.is_good )
|| ( chunkrecord.index_count > 0 ) ) {
// chunks which wait for upload of their data and indexed chunks take the regular route
flush();
count += draw_( *First, Units, Streams );
continue;
}
auto const type { gfx::geometry_bank::chunk( *First ).type };
if( ( pending == static_cast<GLsizei>( offsets.size() ) )
|| ( ( pending > 0 ) && ( type != pendingtype ) ) ) {
flush();
}
pendingtype = type;
offsets[ pending ] = static_cast<GLint>( chunkrecord.vertex_offset );
sizes[ pending ] = static_cast<GLsizei>( chunkrecord.vertex_count );
++pending;
switch( type ) {
case GL_TRIANGLES: { count += chunkrecord.vertex_count / 3; break; }
case GL_TRIANGLE_STRIP: { count += ( chunkrecord.vertex_count > 2 ? chunkrecord.vertex_count - 2 : 0 ); break; }
default: { break; }
}
}
flush();
return count;
}
// release () subclass details
void
opengl33_vaogeometrybank::release_() {