Jump to content
  • Advertisement
Sign in to follow this  
Nightroad

OpenGL How to draw Transparent RubberBand ?

This topic is 2777 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts

Hi there,

I'm new on OpenGL , i'm using it for showing grabbed frames from video camera with texture mapping. There is no problem at all but i have to select some region of the grabbed frame then i have to zoom it, first of all i can't draw a Rubber rectangle it must be transparent when i select the some region of grabbed frame i have to see textured frame transparently could you gimme some piece of code or clue, btw i'm showing grabbed frames like that any suggestion will be good for me as i said before i'm new on OpenGL thanks for your helps ...


void GLWidget::initializeGL()
{
glShadeModel(GL_SMOOTH);
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
glEnable(GL_TEXTURE_2D);
glGenTextures(1, &m_pTextureId);
glBindTexture(GL_TEXTURE_2D, m_pTextureId);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
}
void GLWidget::resizeGL(int w, int h)
{
glViewport(0,0,w,h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1,1,-1,1,-1,1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void GLWidget::setTextureData(BYTE *data, int width, int height)
{
makeCurrent();
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
if (m_isTextured)
glTexSubImage2D(GL_TEXTURE_2D,0,0,0,width,height,GL_BGRA_EXT,GL_UNSIGNED_BYTE,data);
else
glTexImage2D(GL_TEXTURE_2D,0,3,width,height,0,GL_BGRA_EXT,GL_UNSIGNED_BYTE,0);
glBindTexture(GL_TEXTURE_2D,m_pTextureId);
glBegin(GL_QUADS);
glTexCoord2f(0.0,0.0);glVertex2f(-1.0,-1.0);
glTexCoord2f(0.0,1.0);glVertex2f(-1.0,1.0);
glTexCoord2f(1.0,1.0);glVertex2f(1.0,1.0);
glTexCoord2f(1.0,0.0);glVertex2f(1.0,-1.0);
glEnd();
swapBuffers();
}

I'm passing captured frame data to [font="monospace"]setTextureData it's working but i dunno does it good way ...[/font]

Share this post


Link to post
Share on other sites
Advertisement
Sign in to follow this  

  • Advertisement
×

Important Information

By using GameDev.net, you agree to our community Guidelines, Terms of Use, and Privacy Policy.

We are the game development community.

Whether you are an indie, hobbyist, AAA developer, or just trying to learn, GameDev.net is the place for you to learn, share, and connect with the games industry. Learn more About Us or sign up!

Sign me up!