Line texture: stipple implementation, PathLayer support, #105

vtm/resources/assets/shaders/linetex_layer_tex.glsl

@@ -0,0 +1,46 @@
+#ifdef GLES
+precision mediump 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;
+}
+
+$$
+
+#extension GL_OES_standard_derivatives : enable
+#ifdef GLES
+precision mediump float;
+#endif
+uniform vec4 u_color;
+uniform vec4 u_bgcolor;
+uniform float u_pwidth;
+varying vec2 v_st;
+uniform sampler2D tex;
+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);
+}