diff options
Diffstat (limited to 'src/mbgl/shaders/hillshade_prepare.cpp')
| -rw-r--r-- | src/mbgl/shaders/hillshade_prepare.cpp | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/src/mbgl/shaders/hillshade_prepare.cpp b/src/mbgl/shaders/hillshade_prepare.cpp index 733658435e..8d0571f6a4 100644 --- a/src/mbgl/shaders/hillshade_prepare.cpp +++ b/src/mbgl/shaders/hillshade_prepare.cpp @@ -29,6 +29,7 @@ uniform sampler2D u_image; varying vec2 v_pos; uniform vec2 u_dimension; uniform float u_zoom; +uniform float u_maxzoom; float getElevation(vec2 coord, float bias) { // Convert encoded elevation value to meters @@ -71,16 +72,16 @@ void main() { // which can be reduced to: pow(2, 19.25619978527 - u_zoom) // we want to vertically exaggerate the hillshading though, because otherwise // it is barely noticeable at low zooms. to do this, we multiply this by some - // scale factor pow(2, (u_zoom - 14) * a) where a is an arbitrary value and 14 is the - // maxzoom of the tile source. here we use a=0.3 which works out to the - // expression below. see nickidlugash's awesome breakdown for more info + // scale factor pow(2, (u_zoom - u_maxzoom) * a) where a is an arbitrary value + // Here we use a=0.3 which works out to the expression below. see + // nickidlugash's awesome breakdown for more info // https://github.com/mapbox/mapbox-gl-js/pull/5286#discussion_r148419556 float exaggeration = u_zoom < 2.0 ? 0.4 : u_zoom < 4.5 ? 0.35 : 0.3; vec2 deriv = vec2( (c + f + f + i) - (a + d + d + g), (g + h + h + i) - (a + b + b + c) - ) / pow(2.0, (u_zoom - 14.0) * exaggeration + 19.2562 - u_zoom); + ) / pow(2.0, (u_zoom - u_maxzoom) * exaggeration + 19.2562 - u_zoom); gl_FragColor = clamp(vec4( deriv.x / 2.0 + 0.5, |