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// NOTE: DO NOT CHANGE THIS FILE. IT IS AUTOMATICALLY GENERATED.
#include <mbgl/shaders/raster.hpp>
namespace mbgl {
namespace shaders {
const char* raster::name = "raster";
const char* raster::vertexSource = R"MBGL_SHADER(
uniform mat4 u_matrix;
uniform vec2 u_tl_parent;
uniform float u_scale_parent;
uniform float u_buffer_scale;
attribute vec2 a_pos;
attribute vec2 a_texture_pos;
varying vec2 v_pos0;
varying 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;
}
)MBGL_SHADER";
const char* raster::fragmentSource = R"MBGL_SHADER(
uniform float u_fade_t;
uniform float u_opacity;
uniform sampler2D u_image0;
uniform sampler2D u_image1;
varying vec2 v_pos0;
varying 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 = texture2D(u_image0, v_pos0);
vec4 color1 = texture2D(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);
gl_FragColor = vec4(mix(u_high_vec, u_low_vec, rgb) * color.a, color.a);
#ifdef OVERDRAW_INSPECTOR
gl_FragColor = vec4(1.0);
#endif
}
)MBGL_SHADER";
} // namespace shaders
} // namespace mbgl
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