mirror of
https://github.com/MaSzyna-EU07/maszyna.git
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8903d15b94
The geometry of a track made anew, ten times a second while it's dragged, only forgot the chunks it had: the bank kept them all, so the buffer of the section grew by the whole track and its neighbours each time and was sent to the gpu in full again. Ten rebuilds of a test scenery took the bank from 2 to 29 MB; a long session would run the card out of memory. The old chunks are erased from the bank now, but for those of a moving nose, laid again in place, and a moved traction wire drops its old one too. A chunk swapped for one without the extra vertex data kept the flag of having it and the upload read from an empty array; the buffer is made again when that changes.
341 lines
14 KiB
C++
341 lines
14 KiB
C++
/*
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This Source Code Form is subject to the
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terms of the Mozilla Public License, v.
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2.0. If a copy of the MPL was not
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distributed with this file, You can
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obtain one at
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http://mozilla.org/MPL/2.0/.
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*/
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#include "stdafx.h"
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#include "rendering/opengl33geometrybank.h"
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#include "utilities/Logs.h"
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namespace gfx {
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// opengl vao/vbo-based variant of the geometry bank
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// create() subclass details
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void
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opengl33_vaogeometrybank::create_( gfx::geometry_handle const &Geometry ) {
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// adding a chunk means we'll be (re)building the buffer, which will fill the chunk records, amongst other things.
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// thus we don't need to initialize the values here
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m_chunkrecords.emplace_back( chunk_record() );
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// kiss the existing buffer goodbye, new overall data size means we'll be making a new one
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delete_buffer();
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}
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// replace() subclass details
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void
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opengl33_vaogeometrybank::replace_( gfx::geometry_handle const &Geometry ) {
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auto &chunkrecord = m_chunkrecords[ Geometry.chunk - 1 ];
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chunkrecord.is_good = false;
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// if the overall length of the chunk didn't change we can get away with reusing the old buffer...
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if( ( geometry_bank::chunk( Geometry ).vertices.size() != chunkrecord.vertex_count )
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|| ( geometry_bank::chunk( Geometry ).userdata.empty() == chunkrecord.has_userdata ) ) {
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// ...but otherwise we'll need to allocate a new one
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// TBD: we could keep and reuse the old buffer also if the new chunk is smaller than the old one,
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// but it'd require some extra tracking and work to keep all chunks up to date; also wasting vram; may be not worth it?
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delete_buffer();
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}
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}
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void opengl33_vaogeometrybank::setup_buffer()
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{
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if( m_vertexbuffer ) { return; }
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// if there's no buffer, we'll have to make one
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// NOTE: this isn't exactly optimal in terms of ensuring the gfx card doesn't stall waiting for the data
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// may be better to initiate upload earlier (during update phase) and trust this effort won't go to waste
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if( true == m_chunks.empty() ) { return; }
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std::size_t
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vertexcount{ 0 },
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indexcount{ 0 };
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auto chunkiterator = m_chunks.cbegin();
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bool has_userdata{ false };
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for( auto &chunkrecord : m_chunkrecords ) {
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// fill records for all chunks, based on the chunk data
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chunkrecord.is_good = false; // if we're re-creating buffer, chunks might've been uploaded in the old one
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chunkrecord.vertex_offset = vertexcount;
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chunkrecord.vertex_count = chunkiterator->vertices.size();
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vertexcount += chunkrecord.vertex_count;
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chunkrecord.index_offset = indexcount;
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chunkrecord.index_count = chunkiterator->indices.size();
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chunkrecord.has_userdata = !chunkiterator->userdata.empty();
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indexcount += chunkrecord.index_count;
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has_userdata |= chunkrecord.has_userdata;
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++chunkiterator;
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}
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// the odds for all created chunks to get replaced with empty ones are quite low, but the possibility does exist
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if( vertexcount == 0 ) { return; }
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if( !m_vao ) {
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m_vao.emplace();
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}
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m_vao->bind();
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// try to set up the buffers we need:
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// optional index buffer...
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if( indexcount > 0 ) {
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m_indexbuffer.emplace();
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m_indexbuffer->allocate( gl::buffer::ELEMENT_ARRAY_BUFFER, indexcount * sizeof( gfx::basic_index ), GL_STATIC_DRAW );
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if( ::glGetError() == GL_OUT_OF_MEMORY ) {
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ErrorLog( "openGL error: out of memory; failed to create a geometry index buffer" );
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throw std::bad_alloc();
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}
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m_vao->setup_ebo( *m_indexbuffer );
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}
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else {
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gl::buffer::unbind( gl::buffer::ELEMENT_ARRAY_BUFFER );
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}
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// ...and geometry buffer
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m_vertexbuffer.emplace();
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// NOTE: we're using static_draw since it's generally true for all we have implemented at the moment
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// TODO: allow to specify usage hint at the object creation, and pass it here
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const int vertex_size = has_userdata ? sizeof( gfx::basic_vertex ) + sizeof(gfx::vertex_userdata) : sizeof(gfx::basic_vertex);
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m_vertexbuffer->allocate( gl::buffer::ARRAY_BUFFER, static_cast<int>(vertexcount * vertex_size), GL_STATIC_DRAW );
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if( ::glGetError() == GL_OUT_OF_MEMORY ) {
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ErrorLog( "openGL error: out of memory; failed to create a geometry buffer" );
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throw std::bad_alloc();
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}
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m_vertex_count = static_cast<int>(vertexcount);
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setup_attrib();
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if(has_userdata)
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setup_userdata();
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}
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void
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opengl33_vaogeometrybank::setup_attrib(size_t offset)
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{
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m_vao->setup_attrib( *m_vertexbuffer, 0, 3, GL_FLOAT, sizeof( basic_vertex ), offsetof(basic_vertex, position) + offset * sizeof( basic_vertex ) );
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// NOTE: normal and color streams share the data
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m_vao->setup_attrib( *m_vertexbuffer, 1, 3, GL_FLOAT, sizeof( basic_vertex ), offsetof(basic_vertex, normal) + offset * sizeof( basic_vertex ) );
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m_vao->setup_attrib( *m_vertexbuffer, 2, 2, GL_FLOAT, sizeof( basic_vertex ), offsetof(basic_vertex, texture) + offset * sizeof( basic_vertex ) );
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m_vao->setup_attrib( *m_vertexbuffer, 3, 4, GL_FLOAT, sizeof( basic_vertex ), offsetof(basic_vertex, tangent) + offset * sizeof( basic_vertex ) );
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}
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void opengl33_vaogeometrybank::setup_userdata(size_t offset) {
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const size_t offset_evaluated = m_vertex_count * sizeof(basic_vertex) + offset * sizeof( vertex_userdata );
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m_vao->setup_attrib( *m_vertexbuffer, 4, 4, GL_FLOAT, sizeof( vertex_userdata ), offsetof(vertex_userdata, data) + offset_evaluated );}
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// draw() subclass details
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// NOTE: units and stream parameters are unused, but they're part of (legacy) interface
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// TBD: specialized bank/manager pair without the cruft?
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std::size_t
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opengl33_vaogeometrybank::draw_( gfx::geometry_handle const &Geometry, gfx::stream_units const &Units, unsigned int const Streams )
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{
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setup_buffer();
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auto &chunkrecord = m_chunkrecords.at(Geometry.chunk - 1);
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// sanity check; shouldn't be needed but, eh
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if( chunkrecord.vertex_count == 0 )
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return 0;
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auto const &chunk = gfx::geometry_bank::chunk( Geometry );
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if( !chunkrecord.is_good ) {
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m_vao->bind();
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// we may potentially need to upload new buffer data before we can draw it
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if( chunkrecord.index_count > 0 ) {
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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 ) );
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}
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m_vertexbuffer->upload( gl::buffer::ARRAY_BUFFER, chunk.vertices.data(), chunkrecord.vertex_offset * sizeof( gfx::basic_vertex ), chunkrecord.vertex_count * sizeof( gfx::basic_vertex ) );
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if(chunkrecord.has_userdata)
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m_vertexbuffer->upload(gl::buffer::ARRAY_BUFFER, chunk.userdata.data(),
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static_cast<int>(m_vertex_count * sizeof(gfx::basic_vertex) + chunkrecord.vertex_offset * sizeof(gfx::vertex_userdata)),
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static_cast<int>(chunkrecord.vertex_count * sizeof(gfx::vertex_userdata)));
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chunkrecord.is_good = true;
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}
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// render
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if( chunkrecord.index_count > 0 ) {
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if (glDrawRangeElementsBaseVertex) {
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m_vao->bind();
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::glDrawRangeElementsBaseVertex(
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chunk.type,
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0, chunkrecord.vertex_count,
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chunkrecord.index_count, GL_UNSIGNED_INT, reinterpret_cast<void const *>( chunkrecord.index_offset * sizeof( gfx::basic_index ) ),
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chunkrecord.vertex_offset );
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}
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else if (glDrawElementsBaseVertexOES) {
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m_vao->bind();
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::glDrawElementsBaseVertexOES(
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chunk.type,
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chunkrecord.index_count, GL_UNSIGNED_INT, reinterpret_cast<void const *>( chunkrecord.index_offset * sizeof( gfx::basic_index ) ),
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chunkrecord.vertex_offset );
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}
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else {
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setup_attrib(chunkrecord.vertex_offset);
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m_vao->bind();
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::glDrawRangeElements(
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chunk.type,
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0, chunkrecord.vertex_count,
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chunkrecord.index_count, GL_UNSIGNED_INT, reinterpret_cast<void const *>( chunkrecord.index_offset * sizeof( gfx::basic_index ) ) );
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}
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}
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else {
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m_vao->bind();
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::glDrawArrays( chunk.type, chunkrecord.vertex_offset, chunkrecord.vertex_count );
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}
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/*
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m_vao->unbind();
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*/
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auto const vertexcount { ( chunkrecord.index_count > 0 ? chunkrecord.index_count : chunkrecord.vertex_count ) };
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switch( chunk.type ) {
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case GL_TRIANGLES: { return vertexcount / 3; }
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case GL_TRIANGLE_STRIP: { return vertexcount - 2; }
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default: { return 0; }
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}
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}
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// draw_instanced() subclass details — single GL instanced draw for InstanceCount instances.
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// The vertex shader reads per-instance modelview from instance_ubo[gl_InstanceID].
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std::size_t
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opengl33_vaogeometrybank::draw_instanced_( gfx::geometry_handle const &Geometry, gfx::stream_units const &Units, std::size_t const InstanceCount, unsigned int const Streams )
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{
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setup_buffer();
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auto &chunkrecord = m_chunkrecords.at(Geometry.chunk - 1);
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if( chunkrecord.vertex_count == 0 ) { return 0; }
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auto const &chunk = gfx::geometry_bank::chunk( Geometry );
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if( !chunkrecord.is_good ) {
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m_vao->bind();
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if( chunkrecord.index_count > 0 ) {
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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 ) );
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}
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m_vertexbuffer->upload( gl::buffer::ARRAY_BUFFER, chunk.vertices.data(), chunkrecord.vertex_offset * sizeof( gfx::basic_vertex ), chunkrecord.vertex_count * sizeof( gfx::basic_vertex ) );
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if( chunkrecord.has_userdata ) {
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m_vertexbuffer->upload( gl::buffer::ARRAY_BUFFER, chunk.userdata.data(),
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static_cast<int>(m_vertex_count * sizeof(gfx::basic_vertex) + chunkrecord.vertex_offset * sizeof(gfx::vertex_userdata)),
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static_cast<int>(chunkrecord.vertex_count * sizeof(gfx::vertex_userdata)) );
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}
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chunkrecord.is_good = true;
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}
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GLsizei const inst_count = static_cast<GLsizei>(InstanceCount);
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if( chunkrecord.index_count > 0 ) {
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// GLES 3.0 context doesn't provide the base vertex variant, same fallbacks as in draw_()
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if( glDrawElementsInstancedBaseVertex ) {
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m_vao->bind();
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::glDrawElementsInstancedBaseVertex(
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chunk.type,
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chunkrecord.index_count, GL_UNSIGNED_INT,
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reinterpret_cast<void const *>( chunkrecord.index_offset * sizeof( gfx::basic_index ) ),
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inst_count,
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chunkrecord.vertex_offset );
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}
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else if( glDrawElementsInstancedBaseVertexOES ) {
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m_vao->bind();
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::glDrawElementsInstancedBaseVertexOES(
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chunk.type,
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chunkrecord.index_count, GL_UNSIGNED_INT,
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reinterpret_cast<void const *>( chunkrecord.index_offset * sizeof( gfx::basic_index ) ),
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inst_count,
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chunkrecord.vertex_offset );
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}
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else {
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setup_attrib( chunkrecord.vertex_offset );
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m_vao->bind();
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::glDrawElementsInstanced(
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chunk.type,
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chunkrecord.index_count, GL_UNSIGNED_INT,
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reinterpret_cast<void const *>( chunkrecord.index_offset * sizeof( gfx::basic_index ) ),
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inst_count );
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}
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}
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else {
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m_vao->bind();
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::glDrawArraysInstanced( chunk.type, chunkrecord.vertex_offset, chunkrecord.vertex_count, inst_count );
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}
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auto const vertexcount { ( chunkrecord.index_count > 0 ? chunkrecord.index_count : chunkrecord.vertex_count ) };
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std::size_t prims = 0;
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switch( chunk.type ) {
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case GL_TRIANGLES: prims = vertexcount / 3; break;
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case GL_TRIANGLE_STRIP: prims = ( vertexcount > 2 ? vertexcount - 2 : 0 ); break;
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default: prims = 0; break;
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}
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return prims * InstanceCount;
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}
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// draw_batch() subclass details — neighbouring non-indexed chunks of the same type are sent with a single GL call.
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// The chunks are drawn in the supplied order, same as with a draw_() call for each of them.
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std::size_t
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opengl33_vaogeometrybank::draw_batch_( gfx::geometry_handle const *First, gfx::geometry_handle const *Last, gfx::stream_units const &Units, unsigned int const Streams )
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{
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std::size_t count { 0 };
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if( !glMultiDrawArrays ) {
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// GLES context doesn't provide the call
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for( ; First != Last; ++First ) { count += draw_( *First, Units, Streams ); }
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return count;
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}
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setup_buffer();
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std::array<GLint, 64> offsets;
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std::array<GLsizei, 64> sizes;
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GLsizei pending { 0 };
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unsigned int pendingtype { 0 };
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auto const flush = [ & ]() {
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if( pending == 0 ) { return; }
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m_vao->bind();
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if( pending == 1 ) { ::glDrawArrays( pendingtype, offsets[ 0 ], sizes[ 0 ] ); }
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else { ::glMultiDrawArrays( pendingtype, offsets.data(), sizes.data(), pending ); }
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pending = 0;
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};
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for( ; First != Last; ++First ) {
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auto const &chunkrecord = m_chunkrecords.at( First->chunk - 1 );
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if( ( false == chunkrecord.is_good )
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|| ( chunkrecord.index_count > 0 ) ) {
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// chunks which wait for upload of their data and indexed chunks take the regular route
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flush();
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count += draw_( *First, Units, Streams );
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continue;
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}
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auto const type { gfx::geometry_bank::chunk( *First ).type };
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if( ( pending == static_cast<GLsizei>( offsets.size() ) )
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|| ( ( pending > 0 ) && ( type != pendingtype ) ) ) {
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flush();
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}
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pendingtype = type;
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offsets[ pending ] = static_cast<GLint>( chunkrecord.vertex_offset );
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sizes[ pending ] = static_cast<GLsizei>( chunkrecord.vertex_count );
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++pending;
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switch( type ) {
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case GL_TRIANGLES: { count += chunkrecord.vertex_count / 3; break; }
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case GL_TRIANGLE_STRIP: { count += ( chunkrecord.vertex_count > 2 ? chunkrecord.vertex_count - 2 : 0 ); break; }
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default: { break; }
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}
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}
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flush();
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return count;
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}
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// release () subclass details
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void
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opengl33_vaogeometrybank::release_() {
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delete_buffer();
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}
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void
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opengl33_vaogeometrybank::delete_buffer() {
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m_vao.reset();
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m_vertexbuffer.reset();
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m_indexbuffer.reset();
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// NOTE: since we've deleted the buffer all chunks it held were rendered invalid as well
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// instead of clearing their state here we're delaying it until new buffer is created to avoid looping through chunk records twice
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}
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} // namespace gfx
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