A Flutter OpenGL ES plugin using a Texture() widget. Supports Android, Linux and Windows. Many shaders from ShaderToy.com can be copy/pasted

The main workflow of the plugin is:

• ask to native code with a MethodChannel for a texture ID
• use the texture ID in a Texture() widget
• set a vertex and a fragment sources
• start the renderer
• change shader sources on the fly

All functionalities, but the first call to the first method channel, use FFI calls.

The starting idea developing this plugin, was not just to use GLSL, but also take advantage of the wonderful ShaderToy web site.

For now it's possible to copy/paste shaders from ShaderToy, but only those which have only one layer (ie no iChannelN, iSound etc).

Be aware that on a real device, many shaders could be very slow because they are hungry of power and some others needs ES 3 and for now is not supported on Android (ie shaders 13, 14 and 15 in the example).

iResolution, iTime and iMouse are supported, other uniforms can be added at run-time.

• iResolution is a vec3 uniform which represents the texture size
• iTime is a float which represents the time since the shader was created
• iMouse is a vec4 which the x and y values represent the coordinates where the mouse or the touch is grabbed hover the Texture() widget

Be sure you have installed glew and glm packages.

Go into the windows folder from the project root.

• clone Native_SDK:

git clone https://github.com/powervr-graphics/Native_SDK.git

you can safely delete all but the lib and include directories from the cloned repo

• clone glm

git clone https://github.com/g-truc/glm.git

• download glew Binaries for Windows 32-bit and 64-bit from here:

https://glew.sourceforge.net (sources at https://github.com/nigels-com/glew)

extract the zip and rename its main directory to "glew"

Should be ok.

• the c/c++ code is not "state of the art" written! PRs are welcomed 😄
• iOS, Mac and Web support
• add textures (ie iChannel0 used on ShaderToy). A texture of 2^N x 2 could be used for example for FFT audio samples on iSound ShaderToy uniform.
• more then one parallel shaders
• ES 3 on Android (now supports 2)
• displayed FPS seems not to be correct
• use of this plugin not just for shader but also for 3D models