raster.hpp

Go to the documentation of this file.

// Generated code, do not modify this file!
// Generated on 2023-04-05T16:25:15.886Z by mwilsnd using shaders/generate_shader_code.js
 
#pragma once
#include <mbgl/shaders/shader_source.hpp>
 
namespace mbgl {
namespace shaders {
 
template <> struct ShaderSource<BuiltIn::RasterProgram, gfx::Backend::Type::OpenGL> {
    static constexpr const char* vertex = R"(uniform mat4 u_matrix;
uniform vec2 u_tl_parent;
uniform float u_scale_parent;
uniform float u_buffer_scale;
 
layout (location = 0) in vec2 a_pos;
layout (location = 1) in vec2 a_texture_pos;
 
out vec2 v_pos0;
out vec2 v_pos1;
 
void main() {
    gl_Position = u_matrix * vec4(a_pos, 0, 1);
    // We are using Int16 for texture position coordinates to give us enough precision for
    // fractional coordinates. We use 8192 to scale the texture coordinates in the buffer
    // as an arbitrarily high number to preserve adequate precision when rendering.
    // This is also the same value as the EXTENT we are using for our tile buffer pos coordinates,
    // so math for modifying either is consistent.
    v_pos0 = (((a_texture_pos / 8192.0) - 0.5) / u_buffer_scale ) + 0.5;
    v_pos1 = (v_pos0 * u_scale_parent) + u_tl_parent;
}
)";
    static constexpr const char* fragment = R"(uniform float u_fade_t;
uniform float u_opacity;
uniform sampler2D u_image0;
uniform sampler2D u_image1;
in vec2 v_pos0;
in vec2 v_pos1;
 
uniform float u_brightness_low;
uniform float u_brightness_high;
 
uniform float u_saturation_factor;
uniform float u_contrast_factor;
uniform vec3 u_spin_weights;
 
void main() {
 
    // read and cross-fade colors from the main and parent tiles
    vec4 color0 = texture(u_image0, v_pos0);
    vec4 color1 = texture(u_image1, v_pos1);
    if (color0.a > 0.0) {
        color0.rgb = color0.rgb / color0.a;
    }
    if (color1.a > 0.0) {
        color1.rgb = color1.rgb / color1.a;
    }
    vec4 color = mix(color0, color1, u_fade_t);
    color.a *= u_opacity;
    vec3 rgb = color.rgb;
 
    // spin
    rgb = vec3(
        dot(rgb, u_spin_weights.xyz),
        dot(rgb, u_spin_weights.zxy),
        dot(rgb, u_spin_weights.yzx));
 
    // saturation
    float average = (color.r + color.g + color.b) / 3.0;
    rgb += (average - rgb) * u_saturation_factor;
 
    // contrast
    rgb = (rgb - 0.5) * u_contrast_factor + 0.5;
 
    // brightness
    vec3 u_high_vec = vec3(u_brightness_low, u_brightness_low, u_brightness_low);
    vec3 u_low_vec = vec3(u_brightness_high, u_brightness_high, u_brightness_high);
 
    fragColor = vec4(mix(u_high_vec, u_low_vec, rgb) * color.a, color.a);
 
#ifdef OVERDRAW_INSPECTOR
    fragColor = vec4(1.0);
#endif
}
)";
};
 
} // namespace shaders
} // namespace mbgl