GLSLSANDBOX: http://glslsandbox.com/e#31433.1
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#ifdef GL_ES precision mediump float; #endif #extension GL_OES_standard_derivatives : enable uniform float time; uniform vec2 mouse; uniform vec2 resolution; float drawRect(vec2 st, float _left, float _top, float _width, float _height){ //Left Bottom float left = step(_left,st.x); float bottom = step(1.0 - _top - _height, st.y); float right = step(1.0-(_left + _width), 1.0-st.x); float top = step(_top, 1.0-st.y); float pct = left*bottom*right*top; //float pct = left * bottom * right * top; return pct; } void main( void ) { vec2 st = gl_FragCoord.xy/resolution.xy; vec3 color = vec3(0.0); float val1 = 0.02; //Red float pct = drawRect(st, val1, val1, 0.1, 0.2); color = vec3(pct,0.0,0.0); pct = drawRect(st, 0.14, val1, 0.2, 0.06); color += vec3(pct); pct = drawRect(st, 0.88, val1, 0.1, 0.1); color += vec3(pct,0.0,0.0); //White pct = drawRect(st, val1, 0.24, 0.1, 0.74); color += vec3(pct); pct = drawRect(st, 0.14, 0.10, 0.2, 0.38); color += vec3(pct); pct = drawRect(st, 0.36, 0.02, 0.3, 0.96); color += vec3(pct); pct = drawRect(st, 0.68, 0.24, 0.18, 0.64); color += vec3(pct); //Yellow pct = drawRect(st, 0.68, 0.9, 0.18, 0.08); color += vec3(pct,pct,0.); //Green pct = drawRect(st, 0.68, val1, 0.18, 0.2); color += vec3(pct,0.,0.); pct = drawRect(st, 0.88, 0.14, 0.1, 0.84); color += vec3(pct); //Blue pct = drawRect(st, 0.14, 0.50, 0.2, 0.48); color += vec3(0.,0.,pct*0.7); gl_FragColor = vec4(color,1.0); } |
