55 lines
1.5 KiB
GLSL
55 lines
1.5 KiB
GLSL
#ifdef GLES
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precision highp float;
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#endif
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uniform mat4 u_mvp;
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uniform vec4 u_color;
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uniform float u_pscale;
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uniform float u_width;
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attribute vec4 a_pos0;
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attribute vec4 a_pos1;
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attribute vec2 a_len0;
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attribute vec2 a_len1;
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attribute float a_flip;
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varying vec2 v_st;
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void main() {
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vec4 pos;
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if (a_flip == 0.0) {
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// vec2 dir = u_width * a_pos0.zw;
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pos = vec4(a_pos0.xy + (u_width * a_pos0.zw), 0.0, 1.0);
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v_st = vec2(a_len0.x / u_pscale, 1.0);
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} else {
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// vec2 dir = u_width * a_pos1.zw;
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pos = vec4(a_pos1.xy - (u_width * a_pos1.zw), 0.0, 1.0);
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v_st = vec2(a_len1.x / u_pscale, -1.0);
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}
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gl_Position = u_mvp * pos;
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}
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$$
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#ifdef GL_OES_standard_derivatives
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#extension GL_OES_standard_derivatives : enable
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#endif
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#ifdef GLES
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precision highp float;
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#endif
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uniform vec4 u_color;
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uniform vec4 u_bgcolor;
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uniform float u_pwidth;
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varying vec2 v_st;
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void main() {
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/* distance on perpendicular to the line */
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float dist = abs(v_st.t);
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float fuzz = fwidth(v_st.t);
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float fuzz_p = fwidth(v_st.s);
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float line_w = smoothstep(0.0, fuzz, 1.0 - dist);
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float stipple_w = smoothstep(0.0, fuzz, u_pwidth - dist);
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/* triangle waveform in the range 0..1 for regular pattern */
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float phase = abs(mod(v_st.s, 2.0) - 1.0);
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/* interpolate between on/off phase, 0.5 = equal phase length */
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float stipple_p = smoothstep(0.5 - fuzz_p, 0.5 + fuzz_p, phase);
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gl_FragColor = line_w * mix(u_bgcolor, u_color, min(stipple_w, stipple_p));
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}
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