C++ QOpenGLFramebufferObject::bind方法代码示例

void tst_QOpenGL::fboSimpleRendering()
{
    QFETCH(int, surfaceClass);
    QScopedPointer<QSurface> surface(createSurface(surfaceClass));

    QOpenGLContext ctx;
    ctx.create();

    ctx.makeCurrent(surface.data());

    if (!QOpenGLFramebufferObject::hasOpenGLFramebufferObjects())
        QSKIP("QOpenGLFramebufferObject not supported on this platform");

    // No multisample with combined depth/stencil attachment:
    QOpenGLFramebufferObjectFormat fboFormat;
    fboFormat.setAttachment(QOpenGLFramebufferObject::NoAttachment);

    QOpenGLFramebufferObject *fbo = new QOpenGLFramebufferObject(200, 100, fboFormat);

    fbo->bind();

    glClearColor(1.0, 0.0, 0.0, 1.0);
    glClear(GL_COLOR_BUFFER_BIT);
    glFinish();

    QImage fb = fbo->toImage().convertToFormat(QImage::Format_RGB32);
    QImage reference(fb.size(), QImage::Format_RGB32);
    reference.fill(0xffff0000);

    QFUZZY_COMPARE_IMAGES(fb, reference);

    delete fbo;
}

void tst_QOpenGL::fboTextureOwnership()
{
    QFETCH(int, surfaceClass);
    QScopedPointer<QSurface> surface(createSurface(surfaceClass));

    QOpenGLContext ctx;
    QVERIFY(ctx.create());

    ctx.makeCurrent(surface.data());

    if (!QOpenGLFramebufferObject::hasOpenGLFramebufferObjects())
        QSKIP("QOpenGLFramebufferObject not supported on this platform");

    QOpenGLFramebufferObjectFormat fboFormat;
    fboFormat.setAttachment(QOpenGLFramebufferObject::NoAttachment);

    QOpenGLFramebufferObject *fbo = new QOpenGLFramebufferObject(200, 100, fboFormat);
    QVERIFY(fbo->texture() != 0);
    fbo->bind();

    // pull out the texture
    GLuint texture = fbo->takeTexture();
    QVERIFY(texture != 0);
    QVERIFY(fbo->texture() == 0);

    // verify that the next bind() creates a new texture
    fbo->bind();
    QVERIFY(fbo->texture() != 0 && fbo->texture() != texture);

    glClearColor(1.0, 0.0, 0.0, 1.0);
    glClear(GL_COLOR_BUFFER_BIT);
    glFinish();

    QImage fb = fbo->toImage().convertToFormat(QImage::Format_RGB32);
    QImage reference(fb.size(), QImage::Format_RGB32);
    reference.fill(0xffff0000);

    QFUZZY_COMPARE_IMAGES(fb, reference);

    glDeleteTextures(1, &texture);
    delete fbo;
}

void AmbientOcclusionEffect::render() {
    glDisable(GL_BLEND);
    glDisable(GL_DEPTH_TEST);
    glDepthMask(GL_FALSE);
    
    glBindTexture(GL_TEXTURE_2D, Application::getInstance()->getTextureCache()->getPrimaryDepthTextureID());
    
    glActiveTexture(GL_TEXTURE1);
    glBindTexture(GL_TEXTURE_2D, _rotationTextureID);
    
    // render with the occlusion shader to the secondary/tertiary buffer
    QOpenGLFramebufferObject* freeFBO = Application::getInstance()->getGlowEffect()->getFreeFramebufferObject();
    freeFBO->bind();
    
    float left, right, bottom, top, nearVal, farVal;
    glm::vec4 nearClipPlane, farClipPlane;
    Application::getInstance()->getViewFrustum()->computeOffAxisFrustum(
        left, right, bottom, top, nearVal, farVal, nearClipPlane, farClipPlane);
    
    _occlusionProgram->bind();
    _occlusionProgram->setUniformValue(_nearLocation, nearVal);
    _occlusionProgram->setUniformValue(_farLocation, farVal);
    _occlusionProgram->setUniformValue(_leftBottomLocation, left, bottom);
    _occlusionProgram->setUniformValue(_rightTopLocation, right, top);
    QSize widgetSize = Application::getInstance()->getGLWidget()->size();
    _occlusionProgram->setUniformValue(_noiseScaleLocation, widgetSize.width() / (float)ROTATION_WIDTH,
        widgetSize.height() / (float)ROTATION_HEIGHT);
    
    int viewport[4];
    glGetIntegerv(GL_VIEWPORT, viewport);
    const int VIEWPORT_X_INDEX = 0;
    const int VIEWPORT_WIDTH_INDEX = 2;
    float sMin = viewport[VIEWPORT_X_INDEX] / (float)widgetSize.width();
    float sMax = (viewport[VIEWPORT_X_INDEX] + viewport[VIEWPORT_WIDTH_INDEX]) / (float)widgetSize.width(); 
    renderFullscreenQuad(sMin, sMax);
    
    _occlusionProgram->release();
    
    freeFBO->release();
    
    glBindTexture(GL_TEXTURE_2D, 0);
    glActiveTexture(GL_TEXTURE0);
    
    // now render secondary to primary with 4x4 blur
    Application::getInstance()->getTextureCache()->getPrimaryFramebufferObject()->bind();
    
    glEnable(GL_BLEND);
    glBlendFuncSeparate(GL_ZERO, GL_SRC_COLOR, GL_ZERO, GL_ONE);
    
    glBindTexture(GL_TEXTURE_2D, freeFBO->texture());
    
    _blurProgram->bind();
    _blurProgram->setUniformValue(_blurScaleLocation, 1.0f / widgetSize.width(), 1.0f / widgetSize.height());
    
    renderFullscreenQuad(sMin, sMax);
    
    _blurProgram->release();
    
    glBindTexture(GL_TEXTURE_2D, 0);
    
    glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_CONSTANT_ALPHA, GL_ONE);
    glEnable(GL_DEPTH_TEST);
    glDepthMask(GL_TRUE);
}

QOpenGLFramebufferObject* GlowEffect::render(bool toTexture) {
    QOpenGLFramebufferObject* primaryFBO = Application::getInstance()->getTextureCache()->getPrimaryFramebufferObject();
    primaryFBO->release();
    glBindTexture(GL_TEXTURE_2D, primaryFBO->texture());

    glPushMatrix();
    glLoadIdentity();
    
    glMatrixMode(GL_PROJECTION);
    glPushMatrix();
    glLoadIdentity();
    
    glDisable(GL_BLEND);
    glDisable(GL_DEPTH_TEST);
    glDepthMask(GL_FALSE);
    
    QOpenGLFramebufferObject* destFBO = toTexture ?
        Application::getInstance()->getTextureCache()->getSecondaryFramebufferObject() : NULL;
    if (_isEmpty && _renderMode != DIFFUSE_ADD_MODE) {
        // copy the primary to the screen
        if (QOpenGLFramebufferObject::hasOpenGLFramebufferBlit()) {
            QOpenGLFramebufferObject::blitFramebuffer(destFBO, primaryFBO);
                
        } else {
            maybeBind(destFBO);
            glEnable(GL_TEXTURE_2D);
            glDisable(GL_LIGHTING);
            glColor3f(1.0f, 1.0f, 1.0f);
            renderFullscreenQuad();    
            glDisable(GL_TEXTURE_2D);
            glEnable(GL_LIGHTING);
            maybeRelease(destFBO);
        }
    } else if (_renderMode == ADD_MODE) {
        maybeBind(destFBO);
        _addProgram->bind();
        renderFullscreenQuad();
        _addProgram->release();
        maybeRelease(destFBO);
    
    } else if (_renderMode == DIFFUSE_ADD_MODE) {
        // diffuse into the secondary/tertiary (alternating between frames)
        QOpenGLFramebufferObject* oldDiffusedFBO =
            Application::getInstance()->getTextureCache()->getSecondaryFramebufferObject();
        QOpenGLFramebufferObject* newDiffusedFBO =
            Application::getInstance()->getTextureCache()->getTertiaryFramebufferObject();
        if (_isOddFrame) {
            qSwap(oldDiffusedFBO, newDiffusedFBO);
        }
        newDiffusedFBO->bind();
        
        if (_isFirstFrame) {
            glClear(GL_COLOR_BUFFER_BIT);    
            
        } else {
            glActiveTexture(GL_TEXTURE1);
            glBindTexture(GL_TEXTURE_2D, oldDiffusedFBO->texture());
            
            _diffuseProgram->bind();
            QSize size = Application::getInstance()->getGLWidget()->size();
            _diffuseProgram->setUniformValue(_diffusionScaleLocation, 1.0f / size.width(), 1.0f / size.height());
        
            renderFullscreenQuad();
        
            _diffuseProgram->release();
        }
        
        newDiffusedFBO->release();
        
        // add diffused texture to the primary
        glBindTexture(GL_TEXTURE_2D, newDiffusedFBO->texture());
        
        if (toTexture) {
            destFBO = oldDiffusedFBO;
        }
        maybeBind(destFBO);
        _addSeparateProgram->bind();      
        renderFullscreenQuad();
        _addSeparateProgram->release();
        maybeRelease(destFBO);
        
        glBindTexture(GL_TEXTURE_2D, 0);
        glActiveTexture(GL_TEXTURE0);
        
    } else { // _renderMode == BLUR_ADD_MODE || _renderMode == BLUR_PERSIST_ADD_MODE
        // render the primary to the secondary with the horizontal blur
        QOpenGLFramebufferObject* secondaryFBO =
            Application::getInstance()->getTextureCache()->getSecondaryFramebufferObject();
        secondaryFBO->bind();
     
        _horizontalBlurProgram->bind();
        renderFullscreenQuad();
        _horizontalBlurProgram->release();
     
        secondaryFBO->release();
        
        if (_renderMode == BLUR_ADD_MODE) {
            // render the secondary to the screen with the vertical blur
            glActiveTexture(GL_TEXTURE1);
            glBindTexture(GL_TEXTURE_2D, secondaryFBO->texture());
//.........这里部分代码省略.........

QOpenGLFramebufferObject* GlowEffect::render(bool toTexture) {
    PerformanceTimer perfTimer("glowEffect");

    TextureCache* textureCache = DependencyManager::get<TextureCache>();
    QOpenGLFramebufferObject* primaryFBO = textureCache->getPrimaryFramebufferObject();
    primaryFBO->release();
    glBindTexture(GL_TEXTURE_2D, primaryFBO->texture());

    glPushMatrix();
    glLoadIdentity();
    
    glMatrixMode(GL_PROJECTION);
    glPushMatrix();
    glLoadIdentity();
    
    glDisable(GL_BLEND);
    glDisable(GL_DEPTH_TEST);
    glDepthMask(GL_FALSE);

    QOpenGLFramebufferObject* destFBO = toTexture ?
        textureCache->getSecondaryFramebufferObject() : NULL;
    if (!Menu::getInstance()->isOptionChecked(MenuOption::EnableGlowEffect) || _isEmpty) {
        // copy the primary to the screen
        if (destFBO && QOpenGLFramebufferObject::hasOpenGLFramebufferBlit()) {
            QOpenGLFramebufferObject::blitFramebuffer(destFBO, primaryFBO);          
        } else {
            maybeBind(destFBO);
            if (!destFBO) {
                glViewport(0, 0, Application::getInstance()->getGLWidget()->getDeviceWidth(),
                    Application::getInstance()->getGLWidget()->getDeviceHeight());
            }
            glEnable(GL_TEXTURE_2D);
            glDisable(GL_LIGHTING);
            glColor3f(1.0f, 1.0f, 1.0f);
            renderFullscreenQuad();
            glDisable(GL_TEXTURE_2D);
            glEnable(GL_LIGHTING);
            maybeRelease(destFBO);
        }
    } else {
        // diffuse into the secondary/tertiary (alternating between frames)
        QOpenGLFramebufferObject* oldDiffusedFBO =
            textureCache->getSecondaryFramebufferObject();
        QOpenGLFramebufferObject* newDiffusedFBO =
            textureCache->getTertiaryFramebufferObject();
        if (_isOddFrame) {
            qSwap(oldDiffusedFBO, newDiffusedFBO);
        }
        newDiffusedFBO->bind();
        
        if (_isFirstFrame) {
            glClear(GL_COLOR_BUFFER_BIT);    
            
        } else {
            glActiveTexture(GL_TEXTURE1);
            glBindTexture(GL_TEXTURE_2D, oldDiffusedFBO->texture());
            
            _diffuseProgram->bind();
            QSize size = primaryFBO->size();
            _diffuseProgram->setUniformValue(_diffusionScaleLocation, 1.0f / size.width(), 1.0f / size.height());
        
            renderFullscreenQuad();
        
            _diffuseProgram->release();
        }
        
        newDiffusedFBO->release();
        
        // add diffused texture to the primary
        glBindTexture(GL_TEXTURE_2D, newDiffusedFBO->texture());
        
        if (toTexture) {
            destFBO = oldDiffusedFBO;
        }
        maybeBind(destFBO);
        if (!destFBO) {
            glViewport(0, 0,
                Application::getInstance()->getGLWidget()->getDeviceWidth(),
                Application::getInstance()->getGLWidget()->getDeviceHeight());
        }
        _addSeparateProgram->bind();      
        renderFullscreenQuad();
        _addSeparateProgram->release();
        maybeRelease(destFBO);
        
        glBindTexture(GL_TEXTURE_2D, 0);
        glActiveTexture(GL_TEXTURE0);
        
    }
    
    glPopMatrix();
    
    glMatrixMode(GL_MODELVIEW);
    glPopMatrix();
       
    glEnable(GL_BLEND);
    glEnable(GL_DEPTH_TEST);
    glDepthMask(GL_TRUE);
    glBindTexture(GL_TEXTURE_2D, 0);
    
//.........这里部分代码省略.........

void DeferredLightingEffect::render() {
    // perform deferred lighting, rendering to free fbo
    glColor4f(1.0f, 1.0f, 1.0f, 1.0f);    
    
    glDisable(GL_BLEND);
    glDisable(GL_LIGHTING);
    glDisable(GL_DEPTH_TEST);
    glDisable(GL_COLOR_MATERIAL);
    glDepthMask(false);
    
    QOpenGLFramebufferObject* primaryFBO = Application::getInstance()->getTextureCache()->getPrimaryFramebufferObject();
    primaryFBO->release();
    
    QOpenGLFramebufferObject* freeFBO = Application::getInstance()->getGlowEffect()->getFreeFramebufferObject();
    freeFBO->bind();
    glClear(GL_COLOR_BUFFER_BIT);
    
    glBindTexture(GL_TEXTURE_2D, primaryFBO->texture());
    
    glActiveTexture(GL_TEXTURE1);
    glBindTexture(GL_TEXTURE_2D, Application::getInstance()->getTextureCache()->getPrimaryNormalTextureID());
    
    glActiveTexture(GL_TEXTURE2);
    glBindTexture(GL_TEXTURE_2D, Application::getInstance()->getTextureCache()->getPrimarySpecularTextureID());
    
    glActiveTexture(GL_TEXTURE3);
    glBindTexture(GL_TEXTURE_2D, Application::getInstance()->getTextureCache()->getPrimaryDepthTextureID());
        
    // get the viewport side (left, right, both)
    int viewport[4];
    glGetIntegerv(GL_VIEWPORT, viewport);
    const int VIEWPORT_X_INDEX = 0;
    const int VIEWPORT_Y_INDEX = 1;
    const int VIEWPORT_WIDTH_INDEX = 2;
    const int VIEWPORT_HEIGHT_INDEX = 3;
    float sMin = viewport[VIEWPORT_X_INDEX] / (float)primaryFBO->width();
    float sWidth = viewport[VIEWPORT_WIDTH_INDEX] / (float)primaryFBO->width();
    float tMin = viewport[VIEWPORT_Y_INDEX] / (float)primaryFBO->height();
    float tHeight = viewport[VIEWPORT_HEIGHT_INDEX] / (float)primaryFBO->height();
   
    ProgramObject* program = &_directionalLight;
    const LightLocations* locations = &_directionalLightLocations;
    bool shadowsEnabled = Menu::getInstance()->getShadowsEnabled();
    if (shadowsEnabled) {    
        glActiveTexture(GL_TEXTURE4);
        glBindTexture(GL_TEXTURE_2D, Application::getInstance()->getTextureCache()->getShadowDepthTextureID());
        
        program = &_directionalLightShadowMap;
        locations = &_directionalLightShadowMapLocations;
        if (Menu::getInstance()->isOptionChecked(MenuOption::CascadedShadows)) {
            program = &_directionalLightCascadedShadowMap;
            locations = &_directionalLightCascadedShadowMapLocations;
            _directionalLightCascadedShadowMap.bind();
            _directionalLightCascadedShadowMap.setUniform(locations->shadowDistances,
                Application::getInstance()->getShadowDistances());
        
        } else {
            program->bind();
        }
        program->setUniformValue(locations->shadowScale,
            1.0f / Application::getInstance()->getTextureCache()->getShadowFramebufferObject()->width());
        
    } else {
        program->bind();
    }
    
    float left, right, bottom, top, nearVal, farVal;
    glm::vec4 nearClipPlane, farClipPlane;
    Application::getInstance()->computeOffAxisFrustum(
        left, right, bottom, top, nearVal, farVal, nearClipPlane, farClipPlane);
    program->setUniformValue(locations->nearLocation, nearVal);
    float depthScale = (farVal - nearVal) / farVal;
    program->setUniformValue(locations->depthScale, depthScale);
    float nearScale = -1.0f / nearVal;
    float depthTexCoordScaleS = (right - left) * nearScale / sWidth;
    float depthTexCoordScaleT = (top - bottom) * nearScale / tHeight;
    float depthTexCoordOffsetS = left * nearScale - sMin * depthTexCoordScaleS;
    float depthTexCoordOffsetT = bottom * nearScale - tMin * depthTexCoordScaleT;
    program->setUniformValue(locations->depthTexCoordOffset, depthTexCoordOffsetS, depthTexCoordOffsetT);
    program->setUniformValue(locations->depthTexCoordScale, depthTexCoordScaleS, depthTexCoordScaleT);
    
    renderFullscreenQuad(sMin, sMin + sWidth, tMin, tMin + tHeight);
    
    program->release();
    
    if (shadowsEnabled) {
        glBindTexture(GL_TEXTURE_2D, 0);        
        glActiveTexture(GL_TEXTURE3);
    }
    
    // additive blending
    glEnable(GL_BLEND);
    glBlendFunc(GL_ONE, GL_ONE);
    
    glEnable(GL_CULL_FACE);
    
    glm::vec4 sCoefficients(sWidth / 2.0f, 0.0f, 0.0f, sMin + sWidth / 2.0f);
    glm::vec4 tCoefficients(0.0f, tHeight / 2.0f, 0.0f, tMin + tHeight / 2.0f);
    glTexGenfv(GL_S, GL_OBJECT_PLANE, (const GLfloat*)&sCoefficients);
    glTexGenfv(GL_T, GL_OBJECT_PLANE, (const GLfloat*)&tCoefficients);
//.........这里部分代码省略.........

void PerspectiveView::glPass(GLResourceContext &ctx)
{
    glEnable(GL_DEPTH_TEST);

    QMatrix4x4 cameraProjM = _camera->getProjMatrix(width(), height());
    QMatrix4x4 cameraViewM = _camera->getViewMatrix(width(), height());
    QMatrix4x4 cameraProjViewM = cameraProjM * cameraViewM;
    QMatrix4x4 objToWorld;

    Scene* scene = Scene::activeScene();

    // render each mesh
    QHashIterator<QString,Mesh*> meshes = scene->meshes();
    while (meshes.hasNext()) {
        meshes.next();
        Mesh* mesh = meshes.value();

        // make sure a texture exists for this mesh
        if (!hasMeshTexture(mesh)) {
            std::cout << "creating mesh texture" << std::endl;

            QOpenGLFramebufferObject* transferFbo = ctx.transferFbo();

            transferFbo->bind();

            GLuint textureId;
            glGenTextures(1, &textureId);

            glActiveTexture(GL_TEXTURE0);
            glBindTexture(GL_TEXTURE_2D, textureId);
            glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 256, 256, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);

            glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
            glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

            glClearColor(.5,.5,.5,1);
            glClear(GL_COLOR_BUFFER_BIT);

            glMatrixMode(GL_PROJECTION);
            glLoadIdentity();
            glOrtho(0,1,0,1,-1,1);
            glMatrixMode(GL_MODELVIEW);
            glLoadIdentity();

            glViewport(0, 0, 256, 256);

            glColor3f(.8,.8,.8);
            glBegin(GL_QUADS);
            {
                glVertex2f(.25,.25);
                glVertex2f(.75,.25);
                glVertex2f(.75,.75);
                glVertex2f(.25,.75);
            }
            glEnd();

            glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 0, 0, 256, 256, 0);


            transferFbo->release();

            //glActiveTexture(GL_TEXTURE0);
            //QImage img("/tmp/lena.jpg");
            //QImage image = QGLWidget::convertToGLFormat(img);
            //glTexSubImage2D(GL_TEXTURE_2D, 0, 0,0 , image.width(), image.height(),  GL_RGB, GL_UNSIGNED_BYTE, image.bits() );


            glViewport(0, 0, width(), height());

            setMeshTexture(mesh, textureId);
        }

        QOpenGLFramebufferObject* paintFbo = ctx.paintFbo();

        glActiveTexture(GL_TEXTURE0);
        glBindTexture(GL_TEXTURE_2D, meshTexture(mesh));
        glActiveTexture(GL_TEXTURE1);
        glBindTexture(GL_TEXTURE_2D, paintFbo->texture());
        glActiveTexture(GL_TEXTURE0);

        QGLShaderProgram* meshShader = ctx.meshShader();
        meshShader->bind();
        meshShader->setUniformValue("objToWorld", objToWorld);
        meshShader->setUniformValue("cameraPV", cameraProjViewM);
        meshShader->setUniformValue("paintFboWidth", PAINT_FBO_WIDTH);
        meshShader->setUniformValue("brushColor", _brushColor.redF(), _brushColor.greenF(), _brushColor.blueF(), 1);
        meshShader->setUniformValue("meshTexture", 0);
        meshShader->setUniformValue("paintTexture", 1);

        renderMesh(mesh);

        meshShader->release();


    }

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glLoadMatrixf(cameraProjM.data());
    glMatrixMode(GL_MODELVIEW);
//.........这里部分代码省略.........