mirror of
https://github.com/bvanroll/shaders.git
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55 lines
1.7 KiB
GLSL
55 lines
1.7 KiB
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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// this does not work, i'm drawing over what i've drawn before.
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float v_line(vec2 st, float xcor, float width, float y1, float y2) {
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return step(xcor-width,st.x) - step(xcor+width, st.x)- (1.0-step(y1, st.y)) - step(y2, st.y);
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}
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float h_line(vec2 st, float ycor, float width, float x1, float x2) {
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return step(ycor-width, st.y) - step(ycor+width, st.y) - (1.0-step(x1, st.x)) - step(x2, st.x);
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}
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void main() {
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vec2 st = gl_FragCoord.xy/u_resolution;
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vec2 stm = u_mouse/u_resolution;
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vec3 color = vec3(0.0,0.0,0.0);
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//float width = 0.001;
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//color += v_line(st, 0.4, 0.001, 0.25, 0.75) * vec3(1.0);
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//color += h_line(st, 0.75, 0.001, 0.5, 0.6) * vec3(1.0);
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//color += h_line(st, 0.25, 0.001, 0.4, 0.6) * vec3(1.0);
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//color += v_line(st, 0.6, 0.001, 0.25, 0.75) * vec3(1.0);
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//float temp = step(0.4-width, st.x)-step(0.4+width, st.x)-(1.0-step(0.25, st.y))-step(0.75, st.y)
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//+step(0.6-width, st.x)-step(0.6+width,st.x)
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//+step(0.75-width,st.y)-step(0.75+width,st.y)-(1.0-step(0.4-width, st.x))-step(0.6+width,st.x)
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//+step(0.25-width, st.y) - step(0.25+width, st.y);
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//now the simple solution
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//float box = step(0.4, st.x)-(1.0-step(0.25,st.y)) - step(0.6, st.x)-step(0.75, st.y);
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//even simpler
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vec2 box = step(vec2(0.4, 0.25), st)-step(vec2(0.6,0.75), st);
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float r = sin(u_time/20.0);
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float g = sin(u_time/30.0);
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float b = sin(u_time);
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//float mod = distance(stm, vec2(0.5));
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float mod = 1.0;
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color.r = r*mod;
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color.g = g*mod;
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color.b = b*mod;
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color = color;
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gl_FragColor = vec4(color, box.x*box.y);
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}
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