108 lines
3.1 KiB
Plaintext
108 lines
3.1 KiB
Plaintext
#version 150
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uniform mat4 modelViewProjectionMatrix;
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uniform float time;
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uniform bool bottom;
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uniform bool left;
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layout(points) in;
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layout(triangle_strip, max_vertices = 146) out;
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in vec3 Color[];
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out vec3 fColor;
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const float PI = 3.1415926;
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const float transition_point_1 = 0.486946;
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const float cos_p1_1 = 0.35;
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const float cos_p2_1 = 2.0;
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const float ex_p1_1 = -0.193;
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const float ex_p2_1 = 2.9426;
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const float begin_1 = -0.8;
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const float end_1 = 1.5;
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const float transition_point_2 = 0.600598;
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const float cos_p1_2 = 0.3;
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const float cos_p2_2 = 1.7;
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const float ex_p1_2 = -0.19;
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const float ex_p2_2 = 2.762;
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const float begin_2 = -0.8;
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const float end_2 = 2;
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float flickerFunction() {
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return pow(sin(20.0*time + gl_in[0].gl_Position.x*gl_in[0].gl_Position.z), 2);
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}
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float radiusFunction(float x) {
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float value_1 = 0.0;
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float value_2 = 0.0;
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if (x < transition_point_1) {
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value_1 = cos_p1_1 * cos(cos_p2_1 * x);
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}
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else {
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value_1 = exp(ex_p1_1 - ex_p2_1 * x);
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}
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if (x < transition_point_2) {
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value_2 = cos_p1_2 * cos(cos_p2_2 * x);
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}
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else {
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value_2 = exp(ex_p1_2 - ex_p2_2 * x);
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}
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return mix(value_1, value_2, flickerFunction());
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}
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void main() {
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fColor = Color[0];
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float resolution = 6.0;
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float this_begin = mix(begin_1, begin_2, flickerFunction());
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float this_end = mix(end_1, end_2, flickerFunction());
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float step = abs(this_end-this_begin)/resolution/2.0;
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float i = 0.0;
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float render_end = 0.0;
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if (bottom) {
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i = this_begin;
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render_end = (this_end-this_begin)/2.0+step;
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}
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else {
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i = (this_end-this_begin)/2.0;
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render_end = this_end;
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}
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for (i; i<render_end; i+=step) {
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float downRadius = radiusFunction(i);
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float upRadius = radiusFunction(i+step);
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float circle_end = 0.0;
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int j = 0;
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if (left) {
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j = 0;
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circle_end = resolution/2.0;
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}
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else {
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j = int(resolution/2.0);
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circle_end = resolution;
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}
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for (j; j<circle_end; j++) {
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float leftAngle = PI * 2.0 / resolution * j;
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float rightAngle = PI * 2.0 / resolution * (j+1);
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vec4 offset = vec4(cos(rightAngle) * downRadius, i, -sin(rightAngle) * downRadius, 0.0);
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gl_Position = gl_in[0].gl_Position + modelViewProjectionMatrix * offset;
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EmitVertex();
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offset = vec4(cos(rightAngle) * upRadius, i + step, -sin(rightAngle) * upRadius, 0.0);
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gl_Position = gl_in[0].gl_Position + modelViewProjectionMatrix * offset;
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EmitVertex();
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offset = vec4(cos(leftAngle) * downRadius, i, -sin(leftAngle) * downRadius, 0.0);
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gl_Position = gl_in[0].gl_Position + modelViewProjectionMatrix * offset;
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EmitVertex();
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offset = vec4(cos(leftAngle) * upRadius, i + step, -sin(leftAngle) * upRadius, 0.0);
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gl_Position = gl_in[0].gl_Position + modelViewProjectionMatrix * offset;
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EmitVertex();
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EndPrimitive();
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}
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}
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}
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