/**
 * Copyright (c) 2018 The xterm.js authors. All rights reserved.
 * @license MIT
 */

export interface IRasterizedGlyphSet {
  [flags: number]: IRasterizedGlyph;
}

/**
 * Represents a rasterized glyph within a texture atlas. Some numbers are
 * tracked in CSS pixels as well in order to reduce calculations during the
 * render loop.
 */
export interface IRasterizedGlyph {
  /**
   * The x and y offset between the glyph's top/left and the top/left of a cell
   * in pixels.
   */
  offset: IVector;
  /**
   * the x and y position of the glyph in the texture in pixels.
   */
  texturePosition: IVector;
  /**
   * the x and y position of the glyph in the texture in clip space coordinates.
   */
  texturePositionClipSpace: IVector;
  /**
   * The width and height of the glyph in the texture in pixels.
   */
  size: IVector;
  /**
   * The width and height of the glyph in the texture in clip space coordinates.
   */
  sizeClipSpace: IVector;
}

export interface IVector {
  x: number;
  y: number;
}

export interface IBoundingBox {
  top: number;
  left: number;
  right: number;
  bottom: number;
}

export interface IRenderModel {
  cells: Uint32Array;
  lineLengths: Uint32Array;
  selection: ISelectionRenderModel;
}

export interface ISelectionRenderModel {
  hasSelection: boolean;
  viewportStartRow: number;
  viewportEndRow: number;
  viewportCappedStartRow: number;
  viewportCappedEndRow: number;
  startCol: number;
  endCol: number;
}

export interface IWebGL2RenderingContext extends WebGLRenderingContext {
  vertexAttribDivisor(index: number, divisor: number): void;
  createVertexArray(): IWebGLVertexArrayObject;
  bindVertexArray(vao: IWebGLVertexArrayObject): void;
  drawElementsInstanced(mode: number, count: number, type: number, offset: number, instanceCount: number): void;
}

export interface IWebGLVertexArrayObject {
}