// NOTE: DO NOT CHANGE THIS FILE. IT IS AUTOMATICALLY GENERATED.

#include <mbgl/shaders/fill.hpp>

namespace mbgl {
namespace shaders {

const char* fill::name = "fill";
const char* fill::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;

uniform mat4 u_matrix;

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_opacity_t;
attribute lowp float a_opacity_min;
attribute lowp float a_opacity_max;
varying lowp float opacity;

void main() {
    color = mix(a_color_min, a_color_max, a_color_t);
    opacity = mix(a_opacity_min, a_opacity_max, a_opacity_t);

    gl_Position = u_matrix * vec4(a_pos, 0, 1);
}

)MBGL_SHADER";
const char* fill::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 lowp float opacity;

void main() {
    
    

    gl_FragColor = color * opacity;

#ifdef OVERDRAW_INSPECTOR
    gl_FragColor = vec4(1.0);
#endif
}

)MBGL_SHADER";

} // namespace shaders
} // namespace mbgl