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28 lines
753 B
GLSL
28 lines
753 B
GLSL
#ifdef GL_ES
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precision mediump float;
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#endif
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uniform vec2 u_resolution;
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uniform vec2 u_mouse;
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uniform float u_time;
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#define PI 3.14159265359
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void main() {
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vec2 st = gl_FragCoord.xy/u_resolution;
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vec3 color = vec3(0.0,0.0,0.0);
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//draw box
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//float left = step(0.1,st.x); // everything > 0.1 = 1.0
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//float bottom = step(0.1,st.y); // everything > 0.1 = 1.0
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//float right = 1.0-step(0.9,st.x);
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//float top = 1.0-step(0.9,st.y);
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//color = vec3(left*bottom*top*right);
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vec2 bottom_left = step(vec2(0.1),st); // does the same as previous code but passes vec2's to get both
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vec2 top_right = vec2(1.0)-step(vec2(0.9),st);
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color = vec3(bottom_left.x * bottom_left.y * top_right.x * top_right.y);
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gl_FragColor = vec4(color, 1.0);
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}
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