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// NOTE: DO NOT CHANGE THIS FILE. IT IS AUTOMATICALLY GENERATED.
#include <mbgl/shaders/circle.hpp>
namespace mbgl {
namespace shaders {
const char* circle::name = "circle";
const char* circle::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;
}
uniform mat4 u_matrix;
uniform bool u_scale_with_map;
uniform vec2 u_extrude_scale;
attribute vec2 a_pos;
uniform lowp float a_color_t;
attribute lowp vec4 a_color_min;
attribute lowp vec4 a_color_max;
varying lowp vec4 color;
uniform lowp float a_radius_t;
attribute mediump float a_radius_min;
attribute mediump float a_radius_max;
varying mediump float radius;
uniform lowp float a_blur_t;
attribute lowp float a_blur_min;
attribute lowp float a_blur_max;
varying lowp float blur;
uniform lowp float a_opacity_t;
attribute lowp float a_opacity_min;
attribute lowp float a_opacity_max;
varying lowp float opacity;
uniform lowp float a_stroke_color_t;
attribute lowp vec4 a_stroke_color_min;
attribute lowp vec4 a_stroke_color_max;
varying lowp vec4 stroke_color;
uniform lowp float a_stroke_width_t;
attribute mediump float a_stroke_width_min;
attribute mediump float a_stroke_width_max;
varying mediump float stroke_width;
uniform lowp float a_stroke_opacity_t;
attribute lowp float a_stroke_opacity_min;
attribute lowp float a_stroke_opacity_max;
varying lowp float stroke_opacity;
varying vec2 v_extrude;
varying lowp float v_antialiasblur;
void main(void) {
color = mix(a_color_min, a_color_max, a_color_t);
radius = mix(a_radius_min, a_radius_max, a_radius_t);
blur = mix(a_blur_min, a_blur_max, a_blur_t);
opacity = mix(a_opacity_min, a_opacity_max, a_opacity_t);
stroke_color = mix(a_stroke_color_min, a_stroke_color_max, a_stroke_color_t);
stroke_width = mix(a_stroke_width_min, a_stroke_width_max, a_stroke_width_t);
stroke_opacity = mix(a_stroke_opacity_min, a_stroke_opacity_max, a_stroke_opacity_t);
// unencode the extrusion vector that we snuck into the a_pos vector
v_extrude = vec2(mod(a_pos, 2.0) * 2.0 - 1.0);
vec2 extrude = v_extrude * (radius + stroke_width) * u_extrude_scale;
// multiply a_pos by 0.5, since we had it * 2 in order to sneak
// in extrusion data
gl_Position = u_matrix * vec4(floor(a_pos * 0.5), 0, 1);
if (u_scale_with_map) {
gl_Position.xy += extrude;
} else {
gl_Position.xy += extrude * gl_Position.w;
}
// This is a minimum blur distance that serves as a faux-antialiasing for
// the circle. since blur is a ratio of the circle's size and the intent is
// to keep the blur at roughly 1px, the two are inversely related.
v_antialiasblur = 1.0 / DEVICE_PIXEL_RATIO / (radius + stroke_width);
}
)MBGL_SHADER";
const char* circle::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
varying lowp vec4 color;
varying mediump float radius;
varying lowp float blur;
varying lowp float opacity;
varying lowp vec4 stroke_color;
varying mediump float stroke_width;
varying lowp float stroke_opacity;
varying vec2 v_extrude;
varying lowp float v_antialiasblur;
void main() {
float extrude_length = length(v_extrude);
float antialiased_blur = -max(blur, v_antialiasblur);
float opacity_t = smoothstep(0.0, antialiased_blur, extrude_length - 1.0);
float color_t = stroke_width < 0.01 ? 0.0 : smoothstep(
antialiased_blur,
0.0,
extrude_length - radius / (radius + stroke_width)
);
gl_FragColor = opacity_t * mix(color * opacity, stroke_color * stroke_opacity, color_t);
#ifdef OVERDRAW_INSPECTOR
gl_FragColor = vec4(1.0);
#endif
}
)MBGL_SHADER";
} // namespace shaders
} // namespace mbgl
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