149 lines
4.1 KiB
C++
149 lines
4.1 KiB
C++
#include "model_offscreen_render.h"
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#include "model_opengl_object.h"
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#include "model_opengl_program.h"
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ModelOffscreenRender::ModelOffscreenRender(const QSurfaceFormat &format, QScreen *targetScreen):
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QOffscreenSurface(targetScreen),
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m_context(nullptr),
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m_mesh(nullptr)
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{
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setFormat(format);
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create();
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}
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ModelOffscreenRender::~ModelOffscreenRender()
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{
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// FIXME: If delete m_renderFbo inside toImage,
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// sometimes, the application will freeze, maybe there are dead locks inside the destruction call
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// move it here can make sure it will be deleted on the main GUI thread to avoid dead locks
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delete m_renderFbo;
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destroy();
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delete m_mesh;
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}
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void ModelOffscreenRender::setXRotation(int angle)
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{
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m_xRot = angle;
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}
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void ModelOffscreenRender::setYRotation(int angle)
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{
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m_yRot = angle;
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}
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void ModelOffscreenRender::setZRotation(int angle)
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{
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m_zRot = angle;
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}
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void ModelOffscreenRender::setEyePosition(const QVector3D &eyePosition)
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{
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m_eyePosition = eyePosition;
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}
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void ModelOffscreenRender::setMoveToPosition(const QVector3D &moveToPosition)
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{
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m_moveToPosition = moveToPosition;
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}
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void ModelOffscreenRender::setRenderThread(QThread *thread)
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{
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moveToThread(thread);
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}
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void ModelOffscreenRender::updateMesh(ModelMesh *mesh)
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{
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delete m_mesh;
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m_mesh = mesh;
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}
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QImage ModelOffscreenRender::toImage(const QSize &size)
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{
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QImage image;
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if (nullptr == m_mesh)
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return image;
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QMatrix4x4 projection;
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QMatrix4x4 world;
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QMatrix4x4 camera;
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world.setToIdentity();
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world.rotate(m_xRot / 16.0f, 1, 0, 0);
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world.rotate(m_yRot / 16.0f, 0, 1, 0);
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world.rotate(m_zRot / 16.0f, 0, 0, 1);
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projection.setToIdentity();
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projection.translate(m_moveToPosition.x(), m_moveToPosition.y(), m_moveToPosition.z());
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projection.perspective(45.0f, GLfloat(size.width()) / size.height(), 0.01f, 100.0f);
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camera.setToIdentity();
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camera.translate(m_eyePosition);
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m_context = new QOpenGLContext();
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m_context->setFormat(format());
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if (!m_context->create()) {
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delete m_context;
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m_context = nullptr;
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qDebug() << "QOpenGLContext create failed";
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return image;
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}
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if (!m_context->makeCurrent(this)) {
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delete m_context;
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m_context = nullptr;
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qDebug() << "QOpenGLContext makeCurrent failed";
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return image;
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}
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QOpenGLFramebufferObjectFormat format;
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format.setAttachment(QOpenGLFramebufferObject::CombinedDepthStencil);
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format.setSamples(4);
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format.setTextureTarget(GL_TEXTURE_2D);
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format.setInternalTextureFormat(GL_RGBA32F_ARB);
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m_renderFbo = new QOpenGLFramebufferObject(size, format);
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m_renderFbo->bind();
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QOpenGLFunctions *f = m_context->functions();
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f->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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f->glEnable(GL_BLEND);
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f->glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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f->glEnable(GL_DEPTH_TEST);
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f->glEnable(GL_CULL_FACE);
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f->glViewport(0, 0, size.width(), size.height());
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auto object = std::make_unique<ModelOpenGLObject>();
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object->update(std::unique_ptr<ModelMesh>(m_mesh));
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m_mesh = nullptr;
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auto program = std::make_unique<ModelOpenGLProgram>();
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program->load(m_context->format().profile() == QSurfaceFormat::CoreProfile);
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program->bind();
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program->bindEnvironment();
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program->setUniformValue(program->getUniformLocationByName("eyePosition"), m_eyePosition);
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program->setUniformValue(program->getUniformLocationByName("projectionMatrix"), projection);
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program->setUniformValue(program->getUniformLocationByName("modelMatrix"), world);
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program->setUniformValue(program->getUniformLocationByName("viewMatrix"), camera);
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object->draw();
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program->release();
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f->glFlush();
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image = m_renderFbo->toImage();
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program.reset();
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object.reset();
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m_renderFbo->release();
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m_context->doneCurrent();
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delete m_context;
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m_context = nullptr;
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return image;
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}
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