////  GL45BackendTransform.cpp//  libraries/gpu/src/gpu////  Created by Sam Gateau on 3/8/2015.//  Copyright 2014 High Fidelity, Inc.//  Copyright 2024 Overte e.V.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html//#include "GL45Backend.h" #include "gpu/gl/GLBuffer.h" using namespace gpu;using namespace gpu::gl45; void GL45Backend::initTransform() {    GLuint transformBuffers[3];    glCreateBuffers(3, transformBuffers);    _transform._objectBuffer = transformBuffers[0];    _transform._cameraBuffer = transformBuffers[1];    _transform._drawCallInfoBuffer = transformBuffers[2];#ifdef GPU_SSBO_TRANSFORM_OBJECT#else    glCreateTextures(GL_TEXTURE_BUFFER, 1, &_transform._objectBufferTexture);#endif    size_t cameraSize = sizeof(TransformStageState::CameraBufferElement);    while (_transform._cameraUboSize < cameraSize) {        _transform._cameraUboSize += UNIFORM_BUFFER_OFFSET_ALIGNMENT;    }} void GL45Backend::transferTransformState(const Batch& batch) const {    // FIXME not thread safe    static std::vector<uint8_t> bufferData;    if (!_transform._cameras.empty()) {        bufferData.resize(_transform._cameraUboSize * _transform._cameras.size());        for (size_t i = 0; i < _transform._cameras.size(); ++i) {            memcpy(bufferData.data() + (_transform._cameraUboSize * i), &_transform._cameras[i], sizeof(TransformStageState::CameraBufferElement));        }        glNamedBufferData(_transform._cameraBuffer, bufferData.size(), bufferData.data(), GL_STREAM_DRAW);    }     if (!batch._objects.empty()) {        glNamedBufferData(_transform._objectBuffer, batch._objects.size() * sizeof(Batch::TransformObject), batch._objects.data(), GL_STREAM_DRAW);    }     if (!batch._namedData.empty()) {        bufferData.clear();        for (auto& data : batch._namedData) {            auto currentSize = bufferData.size();            auto bytesToCopy = data.second.drawCallInfos.size() * sizeof(Batch::DrawCallInfo);            bufferData.resize(currentSize + bytesToCopy);            memcpy(bufferData.data() + currentSize, data.second.drawCallInfos.data(), bytesToCopy);            _transform._drawCallInfoOffsets[data.first] = (GLvoid*)currentSize;        }        glNamedBufferData(_transform._drawCallInfoBuffer, bufferData.size(), bufferData.data(), GL_STREAM_DRAW);    } #ifdef GPU_SSBO_TRANSFORM_OBJECT    glBindBufferBase(GL_SHADER_STORAGE_BUFFER, slot::storage::ObjectTransforms, _transform._objectBuffer);#else    glActiveTexture(GL_TEXTURE0 + slot::texture::ObjectTransforms);    glBindTexture(GL_TEXTURE_BUFFER, _transform._objectBufferTexture);    glTextureBuffer(_transform._objectBufferTexture, GL_RGBA32F, _transform._objectBuffer);#endif     CHECK_GL_ERROR();     // Make sure the current Camera offset is unknown before render Draw    _transform._currentCameraOffset = INVALID_OFFSET;}  void GL45Backend::updateTransform(const Batch& batch) {    _transform.update(_commandIndex, _stereo);     auto& drawCallInfoBuffer = batch.getDrawCallInfoBuffer();    if (batch._currentNamedCall.empty()) {        auto& drawCallInfo = drawCallInfoBuffer[_currentDraw];        if (_transform._enabledDrawcallInfoBuffer) {            glDisableVertexAttribArray(gpu::Stream::DRAW_CALL_INFO); // Make sure attrib array is disabled            _transform._enabledDrawcallInfoBuffer = false;        }        glVertexAttribI2i(gpu::Stream::DRAW_CALL_INFO, drawCallInfo.index, drawCallInfo.user);    } else {        if (!_transform._enabledDrawcallInfoBuffer) {            glEnableVertexAttribArray(gpu::Stream::DRAW_CALL_INFO); // Make sure attrib array is enabled            glVertexAttribIFormat(gpu::Stream::DRAW_CALL_INFO, 2, GL_UNSIGNED_SHORT, 0);            glVertexAttribBinding(gpu::Stream::DRAW_CALL_INFO, gpu::Stream::DRAW_CALL_INFO);#ifdef GPU_STEREO_DRAWCALL_INSTANCED            glVertexBindingDivisor(gpu::Stream::DRAW_CALL_INFO, (isStereo() ? 2 : 1));#else            glVertexBindingDivisor(gpu::Stream::DRAW_CALL_INFO, 1);#endif            _transform._enabledDrawcallInfoBuffer = true;        }        // NOTE: A stride of zero in BindVertexBuffer signifies that all elements are sourced from the same location,        //       so we must provide a stride.        //       This is in contrast to VertexAttrib*Pointer, where a zero signifies tightly-packed elements.        glBindVertexBuffer(gpu::Stream::DRAW_CALL_INFO, _transform._drawCallInfoBuffer, (GLintptr)_transform._drawCallInfoOffsets[batch._currentNamedCall], 2 * sizeof(GLushort));    }     (void)CHECK_GL_ERROR();} void GL45Backend::do_copySavedViewProjectionTransformToBuffer(const Batch& batch, size_t paramOffset) {    auto slotId = batch._params[paramOffset + 0]._uint;    BufferPointer buffer = batch._buffers.get(batch._params[paramOffset + 1]._uint);    auto dstOffset = batch._params[paramOffset + 2]._uint;    size_t size = _transform._cameraUboSize;     slotId = std::min<gpu::uint32>(slotId, gpu::Batch::MAX_TRANSFORM_SAVE_SLOT_COUNT);    const auto& savedTransform = _transform._savedTransforms[slotId];     if ((dstOffset + size) > buffer->getBufferCPUMemSize()) {        qCWarning(gpugllogging) << "Copying saved TransformCamera data out of bounds of uniform buffer";        size = (size_t)std::max<ptrdiff_t>((ptrdiff_t)buffer->getBufferCPUMemSize() - (ptrdiff_t)dstOffset, 0);    }    if (savedTransform._cameraOffset == INVALID_OFFSET) {        qCWarning(gpugllogging) << "Saved TransformCamera data has an invalid transform offset. Copy aborted.";        return;    }     // Sync BufferObject    auto* object = syncGPUObject(*buffer);    if (object) {        glCopyNamedBufferSubData(_transform._cameraBuffer, object->_buffer, savedTransform._cameraOffset, dstOffset, size);        (void)CHECK_GL_ERROR();    }}