How can I use OpenGL commands for drawing on RenderTexture?

[Latexi95]

I would like to use OpenGL commands for drawing on RenderTexture, but just calling RenderTexture::SetActive(true) doesn't seem to work. What am I doing wrong RenderTexture's Draw command works fine.

Code: [Select]

sf::RenderTexture texture;
texture.Create(400,300);
texture.SetActive(true);
glBegin(GL_LINES);
    glColor4ub(color.r,color.g,color.b,color.a);
    glVertex2f(x1,y1);
    glVertex2f(x2,y2);
glEnd();


Sorry about "bad English".

[Elgan]

I think its more for drawing as you would normally with opengl. Then textures are for ..texture manipulation at a higher level.

[Laurent]

You need to Clear() before drawing, and Display() after.

And does it work if you display a sprite or a shape in your render-texture?

[Latexi95]

You need to Clear() before drawing, and Display() after.

And does it work if you display a sprite or a shape in your render-texture?

I used Clear and Display().
I think my matrices or something "OpenGL think" is incorrect because drawing after using RenderTexture::Draw() works fine. So how could I apply RenderTexture's View? ApplyCurrentView is private member.  :?

Thank you for helping me.

Edit:
I solved that problem.  

[Laurent]

I solved that problem

How?

[sNIk]

I solved that problem

How?

i think he used glViewport(0,0,width,height). i had a similiar issue these days and could solve it by updating the opengl viewport before drawing to a texture.