I am trying to write Vertex and Fragment Shaders for renderi

Question

I am trying to write Vertex and Fragment Shaders for rendering a SkyBox I am having trouble regarding the version of GLSL that is in use How is the version decided Also what version of openGL is used

Deactivated User · Answer

It uses an opengl version compatible with es 2 0

Deactivated User · Answer

Regarding the version of glsl the dsl tries to hide that detail It usually tries somethi g that works

Deactivated User · Answer

Which kind of problems are you finding A feature that is available on greater versions of the glsl shader language

Dave · Answer

I was using an example from here <https learnopengl com Advanced OpenGL Cubemaps> couldn t seem to set up an input on the fragment shader But I think I figured it out using a Varying

Dave · Answer

My next problem is figuring out the Texture class and all associated things It seems a little difficult to understand Any pointers welcome slightly smiling face Else I ll get back to you when I get specific questions

Deactivated User · Answer

The AG Texture is an unmanaged texture that represents a full texture on the GPU no info about size or other things Then on KorGE we have two more classes Texture Base a wrapper around AG Texture + width and height And Texture that is a slice of a Texture Base Then there is a TextureManager this is in charge of each frame get all the Bitmap and BmpSlice and generate the underlying textures as required and removed the textures that are stop being used So on the korge level you usually use BmpSlice and Bitmap and internally it generates Texture and Texture Base that in the end are wrapping AG Texture All that handled by the TextureManager

Dave · Answer

thx

Dave · Answer

Is there an easy way to get some debug output or similar that shows the actual gl calls and in which order they are made

Deactivated User · Answer

Yes it is There is a LogKmlGlProxy here <https github com korlibs korge next blob a7b9852dc2e4e2b7adab8ded8b16266ba8c6b481 korgw src commonMain kotlin com soywiz kgl KmlGlProxy kt L1449 L1479> If you search references of `KmlGl checkedIf` you can see where it is called you can decorate the KmlGl instance with the LogKmlGlProxy to print all the calls You can use that class

Dave · Answer

Great Thanks

Dave · Answer

Also did you look at using mesa3d to get include OpenGL headers and libs

Dave · Answer

Still struggling with getting this skyboxe to render Not sure if its the shaders or the gl calls I will try the kml logging and see if that helps Some of the shader trouble is that the examples are always in GLSL 330

Dave · Answer

if i force the version to 330 it just gives me a glsl compile error

Deactivated User · Answer

Im afraid I cannot help you much with that I believe that if there is an error in the shaders it throws an exception And if it is related to opengl calls it is just plain opengl in the end The AG is in charge of setting the state maybe some state was not set correctly

Dave · Answer

What is the reason for basing everything on what is a pretty old version of OpenGL is this just historic you started the work that long ago Or is there some compatibility problems with newer versions

Deactivated User · Answer

think that we have to support WebGL 1 We can support newer versions but we need to provide a fallback for WebGL 1 at least until WebGPU is available

Deactivated User · Answer

Also some phones still support OpenGL ES 2 0 only Though probably pretty old already

Deactivated User · Answer

The idea is to create new backends for AG supporting vulkan webgpu and metal at least and maybe directx at some point while still supporting opengl for example when we try to support homebrew targets like 3ds switch or psvita and there probably there will be some extra limitations on what s available

Dave · Answer

ah

Dave · Answer

my current issue is wanting to use features that are not available in OpenGL 2 0 Or at least I m trying to use techniques that are illustrated in OpenGL 3 4 and I don t know enough to translate them backwards into v2

Deactivated User · Answer

Uhm I wanted to support at least instanced rendering as an extension when available But no work on this direction yet That s part of AG KmlGL You can make additions if required but that s not planned for 2 0 since I have to work on other things first