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Code Issues 121 Wiki Activity

Enable instancing

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This commit is contained in:
Hirek
2026-05-09 23:29:20 +02:00
parent b7283d8fb9
commit 587077629f
14 changed files with 304 additions and 50 deletions
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51
rendering/opengl33geometrybank.cpp
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@@ -187,6 +187,57 @@ opengl33_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].
std::size_t
opengl33_vaogeometrybank::draw_instanced_( gfx::geometry_handle const &Geometry, gfx::stream_units const &Units, std::size_t const InstanceCount, unsigned int const Streams )
{
setup_buffer();
auto &chunkrecord = m_chunkrecords.at(Geometry.chunk - 1);
if( chunkrecord.vertex_count == 0 ) { return 0; }
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;
}
GLsizei const inst_count = static_cast<GLsizei>(InstanceCount);
if( chunkrecord.index_count > 0 ) {
m_vao->bind();
::glDrawElementsInstancedBaseVertex(
chunk.type,
chunkrecord.index_count, GL_UNSIGNED_INT,
reinterpret_cast<void const *>( chunkrecord.index_offset * sizeof( gfx::basic_index ) ),
inst_count,
chunkrecord.vertex_offset );
}
else {
m_vao->bind();
::glDrawArraysInstanced( chunk.type, chunkrecord.vertex_offset, chunkrecord.vertex_count, inst_count );
}
auto const vertexcount { ( chunkrecord.index_count > 0 ? chunkrecord.index_count : chunkrecord.vertex_count ) };
std::size_t prims = 0;
switch( chunk.type ) {
case GL_TRIANGLES: prims = vertexcount / 3; break;
case GL_TRIANGLE_STRIP: prims = ( vertexcount > 2 ? vertexcount - 2 : 0 ); break;
default: prims = 0; break;
}
return prims * InstanceCount;
}
// release () subclass details
void
opengl33_vaogeometrybank::release_() {