今日永杰开金

    float size = 100.;vec2 checkerboard = mod(floor(gl_FragCoord.xy / size), 2.);float c = mod(checkerboard.x + checkerboard.y, 2.);gl_FragColor = vec4(vec3(c), 1);

或

vec2 uv = floor(S * p.xy * vec2(iResolution.x / iResolution.y, 1) / iResolution.xy);
c = vec4(vec3(mod(uv.x + uv.y, 2.)), 1);

或

	float size = 100.;float oddX = mod(floor(gl_FragCoord.x / size), 2.);float oddY = mod(floor(gl_FragCoord.y / size), 2.);float c = 0.;if( oddX == oddY ){c = 1.;}gl_FragColor = vec4(vec3(c), 1);