Is there an example of how to run vulkan commands on a gtk4 widget?
There are some explanations that it can be done by using Gtk OpenGL widget and then to draw on GL Texture. However, I am not sure how to do it.
Related
I am trying to apply an image texture to a Mesh in QML (Qt 5.6.2). I started from the sample "Shadow Map QML" and I want to texture the GroundPlane. Material and Effect qml classes are applied to that GroundPlane mesh but I can't see how to apply an image texture. In QML, there is TextureImage, ShaderEffect but nothing about how they can be applied to a Mesh.
Any ideas?
EDIT:
Qt 5.6.2 is not the good version to work with to use Qt3D as the first "fully supported release of a stable Qt 3D module" was in Qt 5.7. So, I'll have a look at Qt 5.7, maybe 5.8 now! And at first glance, there is some texture propperties for the mesh.
there is a simple example for you
https://github.com/tripolskypetr/simpleqml3d
Watch on IronMan.qml
I am currently attempting to create an interactive, informative poster, with regards to Anti-Aliasing techniques and effects. The application is written in Obj-C within Xcode, and makes use of OpenGL and Cocoa functionalities.
I am attempting to create a small animation to display the difficulties of drawing a diagonal line on a pixel grid, however am having real trouble getting my head around the animation aspect.
I am aiming for something with a similar look and feel to this:
I have currently drawn a grid using OpenGL primitives:
,
and would like the effect above to be replicated within my grid, however without the shading yet (that is the next part), so just plain black pixels coloured step by step along the line.
I am new to both OpenGL and Obj-C, so am unsure whether best to implement the animation within OpenGL, or using OSx Core Animation - neither of which I have used before.
The OpenGL drawing takes place within my MyOpenGLView class, with the drawing done in a drawAnObject method, which is then called within the drawRect method.
Any help would be much appreciated, thanks in advance!
Currently, I am using SKSpriteKit in order to do all of my graphics stuff in any of my programs. Recently, I’ve been interested in drawing things like the Mandelbrot set, Bifurcation curve, etc.
So to draw these on my screen, I use 1 node per pixel… obviously this means that my program has very low performance with over 100000 nodes on the screen.
I want to find a way of colouring in pixels directly with some command without drawing any nodes. (But I want to stick to Obj-C, Xcode)
Is there some way by accessing Core graphics, or something?
Generally you would use OpenGL ES or Metal to do this.
Here is a tutorial that describes using OpenGL ES shaders with SpriteKit to draw the mandelbrot set:
https://www.weheartswift.com/fractals-xcode-6/
I am using OpenGL ES 1.1 in iOS 5.0 , and I want to draw a sphere with a texture mapped.
The texture will be a map of the world, which is a .png with an alpha channel.
I want that to see the other part of the globe by the inside.
However, I obtain this strange effect and I don't know why this is happening.
I'm exporting from Blender using this script: https://github.com/jlamarche/iOS-OpenGLES-Stuff/tree/master/Blender%20Export/objc_blend_2.62
I've already tried to reverse the orientation of the normals but it didn't help.
I don't want to activate culling because I want to see both faces.
http://imageshack.us/photo/my-images/819/screenshot20121207at308.png/
Using WebGL (which is constrained to the OpenGL ES 2 API), I am successfully rendering to texture and then displaying that texture onscreen. Because it is a texture, it is not being antialiased. If I were rendering to an RBO and then displaying that onscreen, I would be able to take advantage of AA.
My render target setup looks like this:
Create FBO
Bind FBO
Create texture (to be rendered to)
Create and bind depth buffer as RBO
Attach texture and RBO to FBO
And my rendering update loop looks like this:
Render the scene to the FBO created in step #2 above
Render a screen aligned quad with the texture created in step #3 above
With desktop OpenGL, I would call glBlitFramebuffer() instead of drawing the screen aligned quad.
How do I render my scene with antialiasing? Do I need to replace the texture with an RBO? If so, what calls do I use to bind the RBO to draw a screen-aligned quad?
You cannot blit the contents of an RBO to screen in WebGL unless you perform a readback and re-upload to texture to blit, which is rather slow.
WebGL has no support for MSAA on FBOs in any form (neither as RBO nor as RTT).
You can implement your own antialiasing in a variety of ways.
Render at 2:2 size and scale down (google maps with webgl does this)
Render at 1:1 size, run a sobel or laplace edge detection on color and depth, and run a bilateral gaussian blur using edge strength as weight (I've used this technique in some of my demos, it works well, http://codeflow.org/entries/2011/apr/11/advanced-webgl-part-1/ )
Use the morphological antialiasing recipe from GPU Pro 2 (I've yet to try that)