diff options
Diffstat (limited to 'src/mbgl/shaders/collision_circle.cpp')
-rw-r--r-- | src/mbgl/shaders/collision_circle.cpp | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/src/mbgl/shaders/collision_circle.cpp b/src/mbgl/shaders/collision_circle.cpp new file mode 100644 index 0000000000..1e85d99a33 --- /dev/null +++ b/src/mbgl/shaders/collision_circle.cpp @@ -0,0 +1,83 @@ +// NOTE: DO NOT CHANGE THIS FILE. IT IS AUTOMATICALLY GENERATED. + +#include <mbgl/shaders/collision_circle.hpp> + +namespace mbgl { +namespace shaders { + +const char* collision_circle::name = "collision_circle"; +const char* collision_circle::vertexSource = R"MBGL_SHADER( +attribute vec2 a_pos; +attribute vec2 a_anchor_pos; +attribute vec2 a_extrude; +attribute vec2 a_placed; + +uniform mat4 u_matrix; +uniform vec2 u_extrude_scale; +uniform float u_camera_to_center_distance; + +varying float v_placed; +varying float v_notUsed; +varying float v_radius; + +varying vec2 v_extrude; +varying vec2 v_extrude_scale; + +void main() { + vec4 projectedPoint = u_matrix * vec4(a_anchor_pos, 0, 1); + highp float camera_to_anchor_distance = projectedPoint.w; + highp float collision_perspective_ratio = 0.5 + 0.5 * (camera_to_anchor_distance / u_camera_to_center_distance); + + gl_Position = u_matrix * vec4(a_pos, 0.0, 1.0); + + highp float padding_factor = 1.2; // Pad the vertices slightly to make room for anti-alias blur + gl_Position.xy += a_extrude * u_extrude_scale * padding_factor * gl_Position.w / collision_perspective_ratio; + + v_placed = a_placed.x; + v_notUsed = a_placed.y; + v_radius = abs(a_extrude.y); // We don't pitch the circles, so both units of the extrusion vector are equal in magnitude to the radius + + v_extrude = a_extrude * padding_factor; + v_extrude_scale = u_extrude_scale * u_camera_to_center_distance / collision_perspective_ratio; +} + +)MBGL_SHADER"; +const char* collision_circle::fragmentSource = R"MBGL_SHADER( + +varying float v_placed; +varying float v_notUsed; +varying float v_radius; +varying vec2 v_extrude; +varying vec2 v_extrude_scale; + +void main() { + float alpha = 0.5; + + // Red = collision, hide label + vec4 color = vec4(1.0, 0.0, 0.0, 1.0) * alpha; + + // Blue = no collision, label is showing + if (v_placed > 0.5) { + color = vec4(0.0, 0.0, 1.0, 0.5) * alpha; + } + + if (v_notUsed > 0.5) { + // This box not used, fade it out + color *= .2; + } + + float extrude_scale_length = length(v_extrude_scale); + float extrude_length = length(v_extrude) * extrude_scale_length; + float stroke_width = 3.0; + float radius = v_radius * extrude_scale_length; + + float distance_to_edge = abs(extrude_length - radius); + float opacity_t = smoothstep(-stroke_width, 0.0, -distance_to_edge); + + gl_FragColor = opacity_t * color; +} + +)MBGL_SHADER"; + +} // namespace shaders +} // namespace mbgl |