remove old dash support from line shader

src/mbgl/renderer/painter_line.cpp

@@ -131,7 +131,6 @@ void Painter::renderLine(LineBucket& bucket, util::ptr<StyleLayer> layer_desc, c
         lineShader->u_blur = blur;
 
         lineShader->u_color = color;
-        lineShader->u_dasharray = {{ 1, -1 }};
 
         bucket.drawLines(*lineShader);
     }

src/mbgl/shader/line.fragment.glsl

@@ -2,10 +2,7 @@ uniform vec2 u_linewidth;
 uniform vec4 u_color;
 uniform float u_blur;
 
-uniform vec2 u_dasharray;
-
 varying vec2 v_normal;
-varying float v_linesofar;
 
 void main() {
     // Calculate the distance of the pixel from the line in pixels.
@@ -16,10 +13,5 @@ void main() {
     // (v_linewidth.s)
     float alpha = clamp(min(dist - (u_linewidth.t - u_blur), u_linewidth.s - dist) / u_blur, 0.0, 1.0);
 
-    // Calculate the antialiasing fade factor based on distance to the dash.
-    // Only affects alpha when line is dashed
-    float pos = mod(v_linesofar, u_dasharray.x + u_dasharray.y);
-    alpha *= max(step(0.0, -u_dasharray.y), clamp(min(pos, u_dasharray.x - pos), 0.0, 1.0));
-
     gl_FragColor = u_color * alpha;
 }

src/mbgl/shader/line.vertex.glsl

@@ -20,11 +20,9 @@ uniform vec2 u_linewidth;
 uniform vec4 u_color;
 
 varying vec2 v_normal;
-varying float v_linesofar;
 
 void main() {
     vec2 a_extrude = a_data.xy;
-    float a_linesofar = a_data.z * 128.0 + a_data.w;
 
     // We store the texture normals in the most insignificant bit
     // transform y so that 0 => -1 and 1 => 1
@@ -43,5 +41,4 @@ void main() {
     // because we're extruding the line in pixel space, regardless of the current
     // tile's zoom level.
     gl_Position = u_matrix * vec4(floor(a_pos * 0.5), 0.0, 1.0) + u_exmatrix * dist;
-    v_linesofar = a_linesofar * u_ratio;
 }

src/mbgl/shader/line_shader.hpp

@@ -16,7 +16,6 @@ public:
     UniformMatrix<4>               u_exmatrix  = {"u_exmatrix",  *this};
     Uniform<std::array<float, 4>>  u_color     = {"u_color",     *this};
     Uniform<std::array<float, 2>>  u_linewidth = {"u_linewidth", *this};
-    Uniform<std::array<float, 2>>  u_dasharray = {"u_dasharray", *this};
     Uniform<float>                 u_ratio     = {"u_ratio",     *this};
     Uniform<float>                 u_blur      = {"u_blur",      *this};