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Line texture: fix fragment shader, #105

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This commit is contained in:
Emux
2016-07-31 18:42:28 +03:00
parent c926a714db
commit a4934a50cd
2 changed files with 23 additions and 4 deletions
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22
vtm/resources/assets/shaders/linetex_layer_tex.glsl
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@@ -38,9 +38,25 @@ uniform vec4 u_bgcolor;
uniform float u_pwidth;
varying vec2 v_st;
uniform sampler2D tex;
uniform float u_mode;
void
main(){
vec4 c=texture2D(tex,vec2(abs(mod(v_st.s+1.0,2.0)),(v_st.t+1.0)*0.5));
float fuzz=fwidth(c.a);
gl_FragColor=(c * u_color) *smoothstep(0.5-fuzz,0.5+fuzz,c.a);
if (u_mode == 1.0) {
vec4 c=texture2D(tex,vec2(abs(mod(v_st.s+1.0,2.0)),(v_st.t+1.0)*0.5));
float fuzz=fwidth(c.a);
gl_FragColor=(c * u_color) *smoothstep(0.5-fuzz,0.5+fuzz,c.a);
}
else {
/* 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));
}
}