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

#include <mbgl/programs/fill_extrusion_program.hpp>
#include <mbgl/programs/gl/preludes.hpp>
#include <mbgl/programs/gl/shader_source.hpp>
#include <mbgl/gl/program.hpp>

namespace mbgl {
namespace programs {
namespace gl {

template <typename>
struct ShaderSource;

template <>
struct ShaderSource<FillExtrusionProgram> {
    static constexpr const char* name = "fill_extrusion";
    static constexpr const uint8_t hash[8] = { 0x9d, 0x76, 0x7f, 0xaa, 0x86, 0x57, 0x56, 0x96 };
    static constexpr const auto vertexOffset = 21283;
    static constexpr const auto fragmentOffset = 23214;
};

constexpr const char* ShaderSource<FillExtrusionProgram>::name;
constexpr const uint8_t ShaderSource<FillExtrusionProgram>::hash[8];

} // namespace gl
} // namespace programs

namespace gfx {

template <>
std::unique_ptr<gfx::Program<FillExtrusionProgram>>
Backend::Create<gfx::Backend::Type::OpenGL>(const ProgramParameters& programParameters) {
    return std::make_unique<gl::Program<FillExtrusionProgram>>(programParameters);
}

} // namespace gfx
} // namespace mbgl

// Uncompressed source of fill_extrusion.vertex.glsl:
/*
uniform mat4 u_matrix;
uniform vec3 u_lightcolor;
uniform lowp vec3 u_lightpos;
uniform lowp float u_lightintensity;
uniform float u_vertical_gradient;
uniform lowp float u_opacity;

attribute vec2 a_pos;
attribute vec4 a_normal_ed;

varying vec4 v_color;


#ifndef HAS_UNIFORM_u_base
uniform lowp float u_base_t;
attribute highp vec2 a_base;
#else
uniform highp float u_base;
#endif


#ifndef HAS_UNIFORM_u_height
uniform lowp float u_height_t;
attribute highp vec2 a_height;
#else
uniform highp float u_height;
#endif



#ifndef HAS_UNIFORM_u_color
uniform lowp float u_color_t;
attribute highp vec4 a_color;
#else
uniform highp vec4 u_color;
#endif


void main() {
    
#ifndef HAS_UNIFORM_u_base
    highp float base = unpack_mix_vec2(a_base, u_base_t);
#else
    highp float base = u_base;
#endif

    
#ifndef HAS_UNIFORM_u_height
    highp float height = unpack_mix_vec2(a_height, u_height_t);
#else
    highp float height = u_height;
#endif

    
#ifndef HAS_UNIFORM_u_color
    highp vec4 color = unpack_mix_color(a_color, u_color_t);
#else
    highp vec4 color = u_color;
#endif


    vec3 normal = a_normal_ed.xyz;

    base = max(0.0, base);
    height = max(0.0, height);

    float t = mod(normal.x, 2.0);

    gl_Position = u_matrix * vec4(a_pos, t > 0.0 ? height : base, 1);

    // Relative luminance (how dark/bright is the surface color?)
    float colorvalue = color.r * 0.2126 + color.g * 0.7152 + color.b * 0.0722;

    v_color = vec4(0.0, 0.0, 0.0, 1.0);

    // Add slight ambient lighting so no extrusions are totally black
    vec4 ambientlight = vec4(0.03, 0.03, 0.03, 1.0);
    color += ambientlight;

    // Calculate cos(theta), where theta is the angle between surface normal and diffuse light ray
    float directional = clamp(dot(normal / 16384.0, u_lightpos), 0.0, 1.0);

    // Adjust directional so that
    // the range of values for highlight/shading is narrower
    // with lower light intensity
    // and with lighter/brighter surface colors
    directional = mix((1.0 - u_lightintensity), max((1.0 - colorvalue + u_lightintensity), 1.0), directional);

    // Add gradient along z axis of side surfaces
    if (normal.y != 0.0) {
        // This avoids another branching statement, but multiplies by a constant of 0.84 if no vertical gradient,
        // and otherwise calculates the gradient based on base + height
        directional *= (
            (1.0 - u_vertical_gradient) +
            (u_vertical_gradient * clamp((t + base) * pow(height / 150.0, 0.5), mix(0.7, 0.98, 1.0 - u_lightintensity), 1.0)));
    }

    // Assign final color based on surface + ambient light color, diffuse light directional, and light color
    // with lower bounds adjusted to hue of light
    // so that shading is tinted with the complementary (opposite) color to the light color
    v_color.r += clamp(color.r * directional * u_lightcolor.r, mix(0.0, 0.3, 1.0 - u_lightcolor.r), 1.0);
    v_color.g += clamp(color.g * directional * u_lightcolor.g, mix(0.0, 0.3, 1.0 - u_lightcolor.g), 1.0);
    v_color.b += clamp(color.b * directional * u_lightcolor.b, mix(0.0, 0.3, 1.0 - u_lightcolor.b), 1.0);
    v_color *= u_opacity;
}

*/

// Uncompressed source of fill_extrusion.fragment.glsl:
/*
varying vec4 v_color;

void main() {
    gl_FragColor = v_color;

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

*/