[MAPS3D-1498] Add support for line-pattern emissive strength (interna…

…l-1987)

* Add emissive strength support to line-pattern

* Add render test

src/render/program/line_program.ts

@@ -40,6 +40,7 @@ export type LinePatternUniformsType = {
     ['u_tile_units_to_pixels']: Uniform1f;
     ['u_alpha_discard_threshold']: Uniform1f;
     ['u_trim_offset']: Uniform2f;
+    ['u_emissive_strength']: Uniform1f;
     ['u_zbias_factor']: Uniform1f;
     ['u_tile_to_meter']: Uniform1f;
 };
@@ -75,6 +76,7 @@ const linePatternUniforms = (context: Context): LinePatternUniformsType => ({
     'u_tile_units_to_pixels': new Uniform1f(context),
     'u_alpha_discard_threshold': new Uniform1f(context),
     'u_trim_offset': new Uniform2f(context),
+    'u_emissive_strength': new Uniform1f(context),
     'u_zbias_factor': new Uniform1f(context),
     'u_tile_to_meter': new Uniform1f(context)
 });
@@ -144,6 +146,7 @@ const linePatternUniformValues = (
         ],
         'u_alpha_discard_threshold': 0.0,
         'u_trim_offset': trimOffset,
+        'u_emissive_strength': layer.paint.get('line-emissive-strength'),
         'u_zbias_factor': zbiasFactor,
         'u_tile_to_meter': tileToMeter(tile.tileID.canonical, 0.0)
     };

src/shaders/line_pattern.fragment.glsl

@@ -31,6 +31,8 @@ in highp vec4 v_pos_light_view_1;
 in highp float v_depth;
 #endif
 
+uniform float u_emissive_strength;
+
 #pragma mapbox: define mediump vec4 pattern
 #pragma mapbox: define mediump float pixel_ratio
 #pragma mapbox: define mediump float blur
@@ -112,7 +114,7 @@ void main() {
 #endif
 
 #ifdef LIGHTING_3D_MODE
-    color = apply_lighting_ground(color);
+    color = apply_lighting_with_emission_ground(color, u_emissive_strength);
 #ifdef RENDER_SHADOWS
     float light = shadowed_light_factor(v_pos_light_view_0, v_pos_light_view_1, v_depth);
     color.rgb *= mix(u_ground_shadow_factor, vec3(1.0), light);

test/integration/render-tests/lighting-3d-mode/emissive-strength/line-pattern/style.json

@@ -0,0 +1,62 @@
+{
+  "version": 8,
+  "metadata": {
+    "test": {
+      "height": 256,
+      "allowed": 0.0008
+    }
+  },
+  "center": [
+    13.418056,
+    52.499167
+  ],
+  "zoom": 14,
+  "lights": [
+    {
+      "type": "ambient",
+      "id": "test_ambient",
+      "properties": {
+        "color": "rgba(0, 0, 0, 1)",
+        "intensity": 0.4
+      }
+    },
+    {
+      "type": "directional",
+      "id": "test_directional",
+      "properties": {
+        "color": "rgba(0, 0, 0, 1)",
+        "intensity": 0.4
+      }
+    }
+  ],
+  "sources": {
+    "mapbox": {
+      "type": "vector",
+      "maxzoom": 14,
+      "tiles": [
+        "local://tiles/{z}-{x}-{y}.mvt"
+      ]
+    }
+  },
+  "sprite": "local://sprites/emerald",
+  "layers": [
+    {
+      "id": "background",
+      "type": "background",
+      "paint": {
+        "background-color": "blue"
+      }
+    },
+    {
+      "id": "road",
+      "type": "line",
+      "source": "mapbox",
+      "source-layer": "road",
+      "paint": {
+        "line-width": 6,
+        "line-pattern": "generic_icon",
+        "line-emissive-strength": 1
+      }
+    }
+  ]
+}