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Diffstat (limited to 'src/mbgl/shaders/collision_box.hpp')
-rw-r--r-- | src/mbgl/shaders/collision_box.hpp | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/src/mbgl/shaders/collision_box.hpp b/src/mbgl/shaders/collision_box.hpp new file mode 100644 index 0000000000..36bc4e729b --- /dev/null +++ b/src/mbgl/shaders/collision_box.hpp @@ -0,0 +1,131 @@ +#pragma once + +// NOTE: DO NOT CHANGE THIS FILE. IT IS AUTOMATICALLY GENERATED. + +#include <mbgl/gl/gl.hpp> + +namespace mbgl { +namespace shaders { + +class collision_box { +public: + static constexpr const char* name = "collision_box"; + 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; +} +attribute vec2 a_pos; +attribute vec2 a_extrude; +attribute vec2 a_data; + +uniform mat4 u_matrix; +uniform float u_scale; + +varying float v_max_zoom; +varying float v_placement_zoom; + +void main() { + gl_Position = u_matrix * vec4(a_pos + a_extrude / u_scale, 0.0, 1.0); + + v_max_zoom = a_data.x; + v_placement_zoom = a_data.y; +} +)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 +uniform float u_zoom; +uniform float u_maxzoom; + +varying float v_max_zoom; +varying float v_placement_zoom; + +void main() { + + float alpha = 0.5; + + gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0) * alpha; + + if (v_placement_zoom > u_zoom) { + gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0) * alpha; + } + + if (u_zoom >= v_max_zoom) { + gl_FragColor = vec4(0.0, 0.0, 0.0, 1.0) * alpha * 0.25; + } + + if (v_placement_zoom >= u_maxzoom) { + gl_FragColor = vec4(0.0, 0.0, 1.0, 1.0) * alpha * 0.2; + } +} +)MBGL_SHADER"; +}; + +} // namespace shaders +} // namespace mbgl |