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84 lines
3.0 KiB
GLSL
84 lines
3.0 KiB
GLSL
// By Si Ping Lim ( http://www.handson.sg )
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// For Shader Studio Course https://github.com/patriciogonzalezvivo/ss2015
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#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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mat2 rotationMatrix( float angle)
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{
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return mat2( cos( angle ), -sin( angle ),
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sin( angle ), cos( angle ));
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}
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float drawGear (vec2 pixel, vec2 center, float radius , float teethHeight ) {
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vec2 pos = (center-pixel) ;
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float r = length( pos ) * 1.;
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float a = atan(pos.y , pos.x) ;
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float noOfPoints = 9. ;
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float f = smoothstep(-.5, 1., cos(a * noOfPoints ))* teethHeight + radius - teethHeight;
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float color = 1.-smoothstep(f, f+2., r) ;
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return color;
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}
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float drawGearOutline (vec2 pixel, vec2 center, float radius , float teethHeight) {
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vec2 pos = (center-pixel) ;
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float r = length( pos ) * 1.;
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float a = atan(pos.y , pos.x) + u_time ;
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float noOfPoints = 9. ;
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float f = smoothstep(-.5, 1., cos(a * noOfPoints ))* (teethHeight) + radius-teethHeight;
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float color = smoothstep(f+2., f, r) - smoothstep(f, f-2., r) ;
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return color;
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}
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float drawCirclePixelDot(vec2 pixel, vec2 center, float radius){
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vec2 l = pixel-center;
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return smoothstep(1., 0.95, dot(l/radius,l/radius) );
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}
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float drawHollowGear (vec2 pixel, vec2 center, float radius , float teethHeight, float hollowWidth) {
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float t = drawGear ( pixel, center, radius , teethHeight);
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float c = drawCirclePixelDot ( pixel, center, hollowWidth);
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return t-c;
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}
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//included rect function to draw a rext to make sure size of gear is correct
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vec3 drawRect (vec2 pixel, float x, float y, float width, float height) {
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vec4 thickness = vec4(x,y, u_resolution.x - x - width, u_resolution.y - y - height);
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vec4 coors = vec4( pixel.x, pixel.y, u_resolution.x-pixel.x, u_resolution.y-pixel.y);
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vec4 returnV = step ( thickness, coors ) ;
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returnV = clamp(returnV, 0., 1.);
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return vec3( returnV.x * returnV.y * returnV.z * returnV.w);
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}
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void main(){
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vec3 color1 = vec3(1., 0.3, 0.5);
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vec3 color2 = vec3(0., 0.3, 1.);
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vec3 color3 = vec3(0.8, 0.3, 1.);
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vec3 color = vec3(0.0);
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vec2 gear1Position = vec2(350., 200.);
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vec2 rotatedPoint = (gl_FragCoord.xy - gear1Position) * rotationMatrix(u_time*-1.);
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rotatedPoint += gear1Position;
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float gear = drawGear(rotatedPoint, gear1Position , 100., 20. );
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vec2 gear2Position = vec2(170., 135.);
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vec2 rotatedPoint2 = (gl_FragCoord.xy - gear2Position) * rotationMatrix(u_time);
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rotatedPoint2 += gear2Position;
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float hollowGear = drawHollowGear(rotatedPoint2, gear2Position , 100., 20., 70. );
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float gearOutline = drawGearOutline(gl_FragCoord.xy, vec2(150., 400.) , 50., 20.);
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vec3 rect = drawRect (gl_FragCoord.xy, 150., 400., 50., 50.);
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color = color1*vec3(gear) + color2* vec3(gearOutline) ;
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color += color3 * hollowGear;
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// debug rect to make sure gear's size matches
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// color += color3 * rect;
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gl_FragColor = vec4(color, 1.0);
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} |