glslViewer Shader: video_test

video_test.json

{
  "frag": "#ifdef GL_ES\nprecision mediump float;\n#endif\n\nuniform sampler2D   u_tex0;\nuniform vec2        u_tex0Resolution;\n\nuniform float u_time;\nuniform vec2 u_resolution;\n\n#include \"lygia/space/ratio.glsl\"\n#include \"lygia/sample/zero.glsl\"\n\nvoid main() {\n    vec4 color = vec4(vec3(0.0), 1.0);\n    vec2 pixel = 1.0/u_resolution;\n    vec2 st = gl_FragCoord.xy * pixel;\n    st = ratio(st, u_resolution); \n  \tst = ratio(st, u_tex0Resolution.yx);\n\n    color = sampleZero(u_tex0, st);\n\n    gl_FragColor = color;\n}\n",
  "vert": "#ifdef GL_ES\nprecision mediump float;\n#endif\n\nattribute vec4 a_position;\nvarying vec4 v_position;\n\nvoid main() {\n    v_position = a_position;\n    gl_Position = a_position;\n}\n",
  "commands": [
    "fullscreen,on",
    "camera_position,-0,-0,-2",
    "camera_look_at,0,0,0",
    "textures,on"
  ],
  "assets": {