fix precision issues on iOS, close #750

shaders/icon.vertex.glsl

@@ -6,7 +6,7 @@ attribute float a_opacity;
 
 // matrix is for the vertex position, exmatrix is for rotating and projecting
 // the extrusion vector.
-uniform mat4 u_matrix;
+uniform highp mat4 u_matrix;
 uniform mat4 u_exmatrix;
 uniform float u_zoom;
 uniform float u_fadedist;

shaders/line.vertex.glsl

@@ -14,7 +14,7 @@ attribute float a_blur;
 
 // matrix is for the vertex position, exmatrix is for rotating and projecting
 // the extrusion vector.
-uniform mat4 u_matrix;
+uniform highp mat4 u_matrix;
 
 // shared
 uniform float u_ratio;

shaders/linepattern.vertex.glsl

@@ -14,7 +14,7 @@ attribute float a_opacity;
 
 // matrix is for the vertex position, exmatrix is for rotating and projecting
 // the extrusion vector.
-uniform mat4 u_matrix;
+uniform highp mat4 u_matrix;
 uniform mat4 u_exmatrix;
 
 // shared

shaders/linesdfpattern.vertex.glsl

@@ -14,7 +14,7 @@ attribute float a_blur;
 
 // matrix is for the vertex position, exmatrix is for rotating and projecting
 // the extrusion vector.
-uniform mat4 u_matrix;
+uniform highp mat4 u_matrix;
 uniform mat4 u_exmatrix;
 
 uniform float u_ratio;

shaders/outline.vertex.glsl

@@ -1,7 +1,7 @@
 attribute vec2 a_pos;
 attribute vec4 a_color;
 
-uniform mat4 u_matrix;
+uniform highp mat4 u_matrix;
 uniform vec2 u_world;
 
 varying vec4 v_color;

shaders/sdf.vertex.glsl

@@ -8,7 +8,7 @@ attribute float a_gamma;
 
 // matrix is for the vertex position, exmatrix is for rotating and projecting
 // the extrusion vector.
-uniform mat4 u_matrix;
+uniform highp mat4 u_matrix;
 uniform mat4 u_exmatrix;
 
 uniform float u_zoom;