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Diffstat (limited to 'src/mbgl/shaders/circle.hpp')
| -rw-r--r-- | src/mbgl/shaders/circle.hpp | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/src/mbgl/shaders/circle.hpp b/src/mbgl/shaders/circle.hpp new file mode 100644 index 0000000000..cafee6b526 --- /dev/null +++ b/src/mbgl/shaders/circle.hpp @@ -0,0 +1,194 @@ +#pragma once + +// NOTE: DO NOT CHANGE THIS FILE. IT IS AUTOMATICALLY GENERATED. + +#include <mbgl/gl/gl.hpp> + +namespace mbgl { +namespace shaders { + +class circle { +public: + static constexpr const char* name = "circle"; + static constexpr const char* 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"; + static constexpr const char* 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 |