1 files changed, 142 insertions, 0 deletions
diff --git a/src/mbgl/shaders/symbol_icon.cpp b/src/mbgl/shaders/symbol_icon.cpp
new file mode 100644
index 0000000000..eca9342d54
--- /dev/null
+++ b/src/mbgl/shaders/symbol_icon.cpp
@@ -0,0 +1,142 @@
+// NOTE: DO NOT CHANGE THIS FILE. IT IS AUTOMATICALLY GENERATED.
+
+#include <mbgl/shaders/symbol_icon.hpp>
+
+namespace mbgl {
+namespace shaders {
+
+const char* symbol_icon::name = "symbol_icon";
+const char* symbol_icon::vertexSource = R"MBGL_SHADER(
+#ifdef GL_ES
+precision highp float;
+#else
+
+#if !defined(lowp)
+#define lowp
+#endif
+
+#if !defined(mediump)
+#define mediump
+#endif
+
+#if !defined(highp)
+#define highp
+#endif
+
+#endif
+
+float evaluate_zoom_function_1(const vec4 values, const float t) {
+    if (t < 1.0) {
+        return mix(values[0], values[1], t);
+    } else if (t < 2.0) {
+        return mix(values[1], values[2], t - 1.0);
+    } else {
+        return mix(values[2], values[3], t - 2.0);
+    }
+}
+vec4 evaluate_zoom_function_4(const vec4 value0, const vec4 value1, const vec4 value2, const vec4 value3, const float t) {
+    if (t < 1.0) {
+        return mix(value0, value1, t);
+    } else if (t < 2.0) {
+        return mix(value1, value2, t - 1.0);
+    } else {
+        return mix(value2, value3, t - 2.0);
+    }
+}
+
+// The offset depends on how many pixels are between the world origin and the edge of the tile:
+// vec2 offset = mod(pixel_coord, size)
+//
+// At high zoom levels there are a ton of pixels between the world origin and the edge of the tile.
+// The glsl spec only guarantees 16 bits of precision for highp floats. We need more than that.
+//
+// The pixel_coord is passed in as two 16 bit values:
+// pixel_coord_upper = floor(pixel_coord / 2^16)
+// pixel_coord_lower = mod(pixel_coord, 2^16)
+//
+// The offset is calculated in a series of steps that should preserve this precision:
+vec2 get_pattern_pos(const vec2 pixel_coord_upper, const vec2 pixel_coord_lower,
+    const vec2 pattern_size, const float tile_units_to_pixels, const vec2 pos) {
+
+    vec2 offset = mod(mod(mod(pixel_coord_upper, pattern_size) * 256.0, pattern_size) * 256.0 + pixel_coord_lower, pattern_size);
+    return (tile_units_to_pixels * pos + offset) / pattern_size;
+}
+attribute vec2 a_pos;
+attribute vec2 a_offset;
+attribute vec2 a_texture_pos;
+attribute vec4 a_data;
+
+
+// matrix is for the vertex position.
+uniform mat4 u_matrix;
+
+uniform mediump float u_zoom;
+uniform bool u_rotate_with_map;
+uniform vec2 u_extrude_scale;
+
+uniform vec2 u_texsize;
+
+varying vec2 v_tex;
+varying vec2 v_fade_tex;
+
+void main() {
+    vec2 a_tex = a_texture_pos.xy;
+    mediump float a_labelminzoom = a_data[0];
+    mediump vec2 a_zoom = a_data.pq;
+    mediump float a_minzoom = a_zoom[0];
+    mediump float a_maxzoom = a_zoom[1];
+
+    // u_zoom is the current zoom level adjusted for the change in font size
+    mediump float z = 2.0 - step(a_minzoom, u_zoom) - (1.0 - step(a_maxzoom, u_zoom));
+
+    vec2 extrude = u_extrude_scale * (a_offset / 64.0);
+    if (u_rotate_with_map) {
+        gl_Position = u_matrix * vec4(a_pos + extrude, 0, 1);
+        gl_Position.z += z * gl_Position.w;
+    } else {
+        gl_Position = u_matrix * vec4(a_pos, 0, 1) + vec4(extrude, 0, 0);
+    }
+
+    v_tex = a_tex / u_texsize;
+    v_fade_tex = vec2(a_labelminzoom / 255.0, 0.0);
+}
+
+)MBGL_SHADER";
+const char* symbol_icon::fragmentSource = R"MBGL_SHADER(
+#ifdef GL_ES
+precision mediump float;
+#else
+
+#if !defined(lowp)
+#define lowp
+#endif
+
+#if !defined(mediump)
+#define mediump
+#endif
+
+#if !defined(highp)
+#define highp
+#endif
+
+#endif
+uniform sampler2D u_texture;
+uniform sampler2D u_fadetexture;
+uniform lowp float u_opacity;
+
+varying vec2 v_tex;
+varying vec2 v_fade_tex;
+
+void main() {
+    lowp float alpha = texture2D(u_fadetexture, v_fade_tex).a * u_opacity;
+    gl_FragColor = texture2D(u_texture, v_tex) * alpha;
+
+#ifdef OVERDRAW_INSPECTOR
+    gl_FragColor = vec4(1.0);
+#endif
+}
+
+)MBGL_SHADER";
+
+} // namespace shaders
+} // namespace mbgl