export declare const vert = "\nlayout(std140) uniform SceneUniforms {\n  mat3 u_ProjectionMatrix;\n  mat3 u_ViewMatrix;\n  mat3 u_ViewProjectionInvMatrix;\n  vec4 u_BackgroundColor;\n  vec4 u_GridColor;\n  float u_ZoomScale;\n  float u_CheckboardStyle;\n};\n\nlayout(location = 0) in vec2 a_Position;\n\nout vec2 v_Position;\n\nvec2 project_clipspace_to_world(vec2 p) {\n  return (u_ViewProjectionInvMatrix * vec3(p, 1)).xy;\n}\n\nvoid main() {\n  v_Position = project_clipspace_to_world(a_Position);\n  gl_Position = vec4(a_Position, 0, 1);\n}\n";
export declare const frag = "\nlayout(std140) uniform SceneUniforms {\n  mat3 u_ProjectionMatrix;\n  mat3 u_ViewMatrix;\n  mat3 u_ViewProjectionInvMatrix;\n  vec4 u_BackgroundColor;\n  vec4 u_GridColor;\n  float u_ZoomScale;\n  float u_CheckboardStyle;\n};\n\nout vec4 outputColor;\n\nin vec2 v_Position;\n\nconst int CHECKERBOARD_STYLE_NONE = 0;\nconst int CHECKERBOARD_STYLE_GRID = 1;\nconst int CHECKERBOARD_STYLE_DOTS = 2;\nconst float BASE_GRID_PIXEL_SIZE = 100.0;\nconst float BASE_DOT_SIZE = 8.0;\n\nvec2 scale_grid_size(float zoom) {\n  if (zoom < 0.125) return vec2(BASE_GRID_PIXEL_SIZE * 125.0, 0.125);\n  else if (zoom < 0.25) return vec2(BASE_GRID_PIXEL_SIZE * 25.0, 0.25);\n  else if (zoom < 0.5) return vec2(BASE_GRID_PIXEL_SIZE * 5.0, 0.5);\n  return vec2(BASE_GRID_PIXEL_SIZE, 4.0);\n}\n\nvec4 render_grid_checkerboard(vec2 coord) {\n  float alpha = 0.0;\n\n  vec2 size = scale_grid_size(u_ZoomScale);\n  float gridSize1 = size.x;\n  float gridSize2 = gridSize1 / 10.0;\n  float zoomStep = size.y;\n  int checkboardStyle = int(floor(u_CheckboardStyle + 0.5));\n\n  if (checkboardStyle == CHECKERBOARD_STYLE_GRID) {\n    vec2 grid1 = abs(fract(coord / gridSize1 - 0.5) - 0.5) / fwidth(coord) * gridSize1 / 2.0;\n    vec2 grid2 = abs(fract(coord / gridSize2 - 0.5) - 0.5) / fwidth(coord) * gridSize2;\n    float v1 = 1.0 - min(min(grid1.x, grid1.y), 1.0);\n    float v2 = 1.0 - min(min(grid2.x, grid2.y), 1.0);\n\n    if (v1 > 0.0) {\n      alpha = v1;\n    } else {\n      alpha = v2 * clamp(u_ZoomScale / zoomStep, 0.0, 1.0);\n    }\n  } else if (checkboardStyle == CHECKERBOARD_STYLE_DOTS) {\n    vec2 grid2 = abs(fract(coord / gridSize2 - 0.5) - 0.5) / fwidth(coord) * gridSize2;\n    alpha = 1.0 - smoothstep(0.0, 1.0, length(grid2) - BASE_DOT_SIZE * u_ZoomScale / zoomStep);\n  }\n\n  return mix(u_BackgroundColor, u_GridColor, alpha);\n}\n\nvoid main() {\n  outputColor = render_grid_checkerboard(v_Position);\n}\n";