assets.shaders.linetex_layer.glsl Maven / Gradle / Ivy

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OpenGL vector map library written in Java - running on Android, iOS, Desktop and within the browser.

There is a newer version: 0.21.0

#ifdef GLES
precision highp float;
#endif
uniform mat4 u_mvp;
uniform vec4 u_color;
uniform float u_pscale;
uniform float u_width;
attribute vec4 a_pos0;
attribute vec4 a_pos1;
attribute vec2 a_len0;
attribute vec2 a_len1;
attribute float a_flip;
varying vec2 v_st;

void main() {
    vec4 pos;
    if (a_flip == 0.0) {
        //    vec2 dir = u_width * a_pos0.zw;
        pos = vec4(a_pos0.xy + (u_width * a_pos0.zw), 0.0, 1.0);
        v_st = vec2(a_len0.x / u_pscale, 1.0);
    } else {
        //    vec2 dir = u_width * a_pos1.zw;
        pos = vec4(a_pos1.xy - (u_width * a_pos1.zw), 0.0, 1.0);
        v_st = vec2(a_len1.x / u_pscale, -1.0);
    }
    gl_Position = u_mvp * pos;
}

$$

#ifdef GL_OES_standard_derivatives
#extension GL_OES_standard_derivatives : enable
#endif
#ifdef GLES
precision highp float;
#endif
uniform vec4 u_color;
uniform vec4 u_bgcolor;
uniform float u_pwidth;
varying vec2 v_st;

void main() {
    /* distance on perpendicular to the line */
    float dist = abs(v_st.t);
    float fuzz = fwidth(v_st.t);
    float fuzz_p = fwidth(v_st.s);
    float line_w = smoothstep(0.0, fuzz, 1.0 - dist);
    float stipple_w = smoothstep(0.0, fuzz, u_pwidth - dist);
    /* triangle waveform in the range 0..1 for regular pattern */
    float phase = abs(mod(v_st.s, 2.0) - 1.0);
    /* interpolate between on/off phase, 0.5 = equal phase length */
    float stipple_p = smoothstep(0.5 - fuzz_p, 0.5 + fuzz_p, phase);
    gl_FragColor = line_w * mix(u_bgcolor, u_color, min(stipple_w, stipple_p));
}