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** Alternatively, this file may be used under the terms of the GNU
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****************************************************************************/

#include "resourceaccessor_p.h"

#include <Qt3DRender/qrendertargetoutput.h>

#include <private/qrendertargetoutput_p.h>
#include <private/nodemanagers_p.h>
#include <private/texture_p.h>
#include <private/rendertargetoutput_p.h>
#include <private/gltexturemanager_p.h>
#include <private/managers_p.h>
#include <private/gltexture_p.h>

#include <QtCore/qmutex.h>

QT_BEGIN_NAMESPACE

namespace Qt3DRender {
namespace Render {

RenderBackendResourceAccessor::~RenderBackendResourceAccessor()
{

}

ResourceAccessor::ResourceAccessor(NodeManagers *mgr)
    : m_glTextureManager(mgr->glTextureManager())
    , m_textureManager(mgr->textureManager())
    , m_attachmentManager(mgr->attachmentManager())
    , m_entityManager(mgr->renderNodesManager())
{

}

// called by render plugins from arbitrary thread
bool ResourceAccessor::accessResource(ResourceType type, Qt3DCore::QNodeId nodeId, void **handle, QMutex **lock)
{
    switch (type) {

    case RenderBackendResourceAccessor::OGLTextureWrite:
        Q_FALLTHROUGH();
    case RenderBackendResourceAccessor::OGLTextureRead:
    {
        Texture *tex = m_textureManager->lookupResource(nodeId);
        if (!tex)
            return false;

        GLTexture *glTex = m_glTextureManager->lookupResource(tex->peerId());
        if (!glTex)
            return false;

        if (glTex->isDirty())
            return false;

        if (type == RenderBackendResourceAccessor::OGLTextureWrite)
            glTex->setExternalRenderingEnabled(true);

        QOpenGLTexture **glTextureHandle = reinterpret_cast<QOpenGLTexture **>(handle);
        *glTextureHandle = glTex->getGLTexture();

        if (type == RenderBackendResourceAccessor::OGLTextureWrite)
            *lock = glTex->externalRenderingLock();

        return true;
    }

    case RenderBackendResourceAccessor::OutputAttachment: {
        RenderTargetOutput *output = m_attachmentManager->lookupResource(nodeId);
        if (output) {
            Attachment **attachmentData = reinterpret_cast<Attachment **>(handle);
            *attachmentData = output->attachment();
            return true;
        }
        break;
    }

    case RenderBackendResourceAccessor::EntityHandle: {
        Entity *entity = m_entityManager->lookupResource(nodeId);
        if (entity) {
            Entity **pEntity = reinterpret_cast<Entity **>(handle);
            *pEntity = entity;
            return true;
        }
        break;
    }

    default:
        break;
    }
    return false;
}

} // namespace Render
} // namespace Qt3DRender

QT_END_NAMESPACE