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CLE Shadertoy

This project uses GeeXLab. GeeXLab is available for Windows, MacOS, Linux, and Raspberry Pi. Please download it and make the following changes to run this project.

First you need to create a start_shadertoy.bat script (or equivalent for other OS) and set the path to the GeeXLab.exe executable. For example, it could be the following:

start C:\GeeXLab_FREE_win64\GeeXLab.exe /log_framerate /no_menubar /glinfo /demofile="tiled_display.xml"

The commands to load an image are in tiled_display.xml. The majority of the code inside block in the xml file is lua. Comments in lua begin with --.

Notes

  • Image loading uses gh_texture.create_from_file() or its relatives (v2, etc.)
    • Call create_from_file inside init_scene
    • Call gh_texture.bind(tex, 0) inside update_scene with gh_gpu_program.uniform1i(gpu_prog_01, "iChannel0", 0) to bind it
  • Video loading/updating uses gh_av.video_init_texture()
    • Call video_init_texture inside init_scene
    • As above, bind the texture inside update_scene but also call gh_av.video_update_texture(av, tex_id) to get a new frame

I had to change fragCoord to gl_FragCoord to get the code to work in GeeXLab.

Converting the shadertoy from https://www.shadertoy.com/view/Md2fWd into Falcor.

Code below:

void mainImage( out vec4 fragColor, in vec2 fragCoord )
{
	vec2 uv = fragCoord.xy / iResolution.xy;
    
	fragColor = vec4(uv,0.5+0.5*sin(iTime),1.0);
	
//    int frame_number = int(floor(iTime / 16.66667));
    
//    frame_number % 4;
    
//    float c = float(iFrame%4)/4.0;
//    uv /= 2.0;
    
//    float b = texture(iChannel0, vec2(uv.x/3.0, uv.y)).r;
//    float r = texture(iChannel0, vec2(1.0/3.0 + uv.x/3.0, uv.y)).r;
//    float g = texture(iChannel0, vec2(2.0/3.0 + uv.x/3.0, uv.y)).r;

//    float r = texture(iChannel0, vec2(uv.x/3.0, uv.y)).r;
//    float g = texture(iChannel0, vec2(1.0/3.0 + uv.x/3.0, uv.y)).r;
//    float b = texture(iChannel0, vec2(2.0/3.0 + uv.x/3.0, uv.y)).r;

//    float g = texture(iChannel0, vec2(uv.x/3.0, uv.y)).r;
//    float r = texture(iChannel0, vec2(1.0/3.0 + uv.x/3.0, uv.y)).r;
//    float b = texture(iChannel0, vec2(2.0/3.0 + uv.x/3.0, uv.y)).r;

    
    float g = texture(iChannel0, vec2(uv.x/3.0, uv.y)).r;
    float b = texture(iChannel0, vec2(1.0/3.0 + uv.x/3.0, uv.y)).r;
    float r = texture(iChannel0, vec2(2.0/3.0 + uv.x/3.0, uv.y)).r;

    
//    float r = texture(iChannel0, vec2(uv.x, uv.y)).g;
  //  float g = texture(iChannel1, vec2(uv.x, uv.y)).g;
    //float b = texture(iChannel2, vec2(uv.x, uv.y)).g;
//    float g = texture(iChannel0, vec2(1.0/3.0 + uv.x/3.0, uv.y)).r;
//    float b = texture(iChannel0, vec2(2.0/3.0 + uv.x/3.0, uv.y)).r;

    
    fragColor = vec4(r, g, b, 1.0);
//    fragColor = vec4(r);
//    fragColor = vec4(g);
//    fragColor = vec4(b);

}