c++ - OpenGL scene under Qt qml application -


this should best way how add custom opengl qml app.

http://qt-project.org/doc/qt-5/qtquick-scenegraph-openglunderqml-example.html

the problem is, dont want paint on whole window, in rectangle occupied opengl custom qt quick item. thought can call glviewport appropriate parameters, opengl paint rectangle of item.

actually, doesn't work me.

qml:

import qtquick 2.2 import qtquick.controls 1.1 import ge.components 1.0  applicationwindow {     visible: true     width: 640     height: 480     title: qstr("hello world")     color: "red"      menubar: menubar {         menu {             title: qstr("filxe")             menuitem {                 text: qstr("exit")                 ontriggered: qt.quit();             }         }     }      glviewer {         width: 200         height: 200         x: 100         y: 100     } }

qt quick item: in paint method, first fill whole window color of applicationwindow , want fill rectangle occupied item black color. fill whole window black, why???

#include "glviewer.h" #include <qquickwindow> #include <iostream> #include <qcolor>  using namespace std;  glviewer::glviewer(qquickitem *parent) :     qquickitem(parent) {     connect(this, signal(windowchanged(qquickwindow*)), this, slot(handlewindowchanged(qquickwindow*))); }  void glviewer::handlewindowchanged(qquickwindow *win) {     if (win) {         connect(win, signal(beforerendering()), this, slot(paint()), qt::directconnection);         win->setclearbeforerendering(false);     } }  void glviewer::paint() {      qcolor color = window()->color();     glclearcolor(color.red(), color.green(), color.blue(), color.alpha());     glclear(gl_color_buffer_bit | gl_depth_buffer_bit);      cout << "x: " << x() << ", y: " << y() << ", w: " << width() << ", h: " << height() << endl;      glviewport(x(), y(), width(), height());     glclearcolor(0.0f, 0.0f, 0.0f, 1.0f);     glclear(gl_color_buffer_bit);  }

there 2 issues code. first one, applicationwindow has no color attribute when set

color: "red"

in component don't set color (that color black). can set background color applicationwindow adding rectangle component before glviewer follow

rectangle {     width: parent.width     height: parent.height     anchors.centerin: parent     color: "red" }

second one, drawing in main windows gl context then, if viewport correctly setted, following lines of code

glclearcolor(0.0f, 0.0f, 0.0f, 1.0f); glclear(gl_color_buffer_bit);

will clear entire window. if want clear part of window have use glscissor

glviewport(x, y, w, h);  glenable(gl_scissor_test); glscissor(x,y,w,h);  glclearcolor(0, 0, 0, 1); glclear(gl_color_buffer_bit);  gldisable(gl_scissor_test);

you can find complete example (based on link) on github.


Comments

Post a Comment

Popular posts from this blog

commonjs - How to write a typescript definition file for a node module that exports a function? -

consider, toml node module can use: // toml.d.ts declare module toml { export function parse(value:string):any; } declare module "toml" { export = toml; } then: /// <reference path="../../../../../defs/toml/toml.d.ts"/> import toml = require('toml'); toml.parse(...); however, node module export single function, such 'glob' ( https://github.com/isaacs/node-glob ). the node usage of module be: var glob = require("glob") glob("*.js", {}, callback(err, files) { ... }); you'd naively expect this: // glob.d.ts declare function globs(paths:string, options:any, callback:{(err:any, files:string[]):void; ...but because typescripts 'import' semantics bit strange, seems can use 'import .. = require()' statement alias modules . trying call: /// <reference path="../../../../../defs/glob/glob.d.ts"/> import blog = require('glob'); results in: error ts2072: mod
Read more

openid - Okta: Failed to get authorization code through API call -

i'm integrating okta own idp server using okta's api. i'm implementing authorization code flow following steps below: in own server, use /api/v1/authn endpoint sessiontoken. use sessiontoken obtain authorization calling endpoint: /oauth2/v1/authorize?client_id=" + clientid + "&sessiontoken=" + sessiontoken + "&response_type=code&response_mode=query&scope=openid&redirect_uri=" + redirecturl + "&state=evanyang&nonce=" it's supposed return response status code 302 , location header containing redirect url code value. however, keep getting response status code 200 , without location header, html body saying "you using unsupported browser." , "javascript disabled on browser." according api documentation: http://developer.okta.com/docs/api/resources/oidc.html#authentication-request , sessiontoken parameter sufficient this: an okta one-time sessiontoken. allows api-based
Read more

thorough guide for profiling racket code -

did googling ("racket profiling", "racket measure performance"), didn't find , there no examples in docs. did google "profile" search on htdp - no luck. (profile (f ...)) output isn't obvious other small snippets. ideally want python's python -m cprofile usage examples. when search "python profiling", both duckduckgo , google give top result: 26.4. python profilers . (although scanned quickly, seems more of reference "thorough usage guide" examples. if had else in mind, perhaps please link that?) the equivalent racket documentation be: profile: statistical profiler . a usage example: #lang racket (require profile) (profile-thunk (thunk (function-to-profile arg0 arg1) )) here (thunk e) convenience (lambda () e) . bigger example: #lang racket (module mod racket (provide f) (define (f) (for/list ([i 10000]) i))) (require (prefix-in mod: 'mod)) (define (f) (for ([i 10000
Read more