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webgl-rend
| Author | SHA1 | Date |
|---|---|---|
 cpsdqs
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1804efce36
|
7 years ago |
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cpsdqs
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6bbfb968bc | 7 years ago |
|
cpsdqs
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7fe6495a27
|
7 years ago |
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cpsdqs
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46a3bddcb0
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7 years ago |
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cpsdqs
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da05ec7a2d
|
7 years ago |
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cpsdqs
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c89d3d2254
|
7 years ago |
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cpsdqs
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9ed8412edd
|
7 years ago |
@ -0,0 +1,201 @@ |
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module.exports = class GLFontCache { |
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constructor (gl) { |
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this.gl = gl |
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|
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// cache: string => WebGLTexture
|
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this.cache = new Map() |
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this.dp = 1 |
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this.cellSize = { width: 0, height: 0 } |
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|
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this.canvas = document.createElement('canvas') |
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this.ctx = this.canvas.getContext('2d') |
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} |
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|
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clearCache () { |
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for (let texture of this.cache.values()) this.gl.deleteTexture(texture) |
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this.cache = new Map() |
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} |
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|
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getChar (font, character) { |
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let name = `${font}@${this.dp}x:${character}` |
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|
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if (!this.cache.has(name)) { |
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this.cache.set(name, this.render(font, character)) |
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} |
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return this.cache.get(name) |
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} |
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|
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render (font, character) { |
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const { gl, ctx, dp, cellSize } = this |
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|
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let width = dp * cellSize.width * 3 |
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let height = dp * cellSize.height * 3 |
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if (this.canvas.width !== width) this.canvas.width = width |
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if (this.canvas.height !== height) this.canvas.height = height |
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|
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ctx.setTransform(1, 0, 0, 1, 0, 0) |
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ctx.clearRect(0, 0, width, height) |
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ctx.scale(dp, dp) |
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|
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if (ctx.font !== font) ctx.font = font |
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|
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ctx.textAlign = 'center' |
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ctx.textBaseline = 'middle' |
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ctx.fillStyle = 'white' |
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this.drawCharacter(character) |
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|
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let imageData = ctx.getImageData(0, 0, width, height) |
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|
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let texture = gl.createTexture() |
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gl.bindTexture(gl.TEXTURE_2D, texture) |
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gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, imageData) |
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|
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR) |
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE) |
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE) |
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|
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return texture |
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} |
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|
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drawCharacter (character) { |
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const { ctx, cellSize } = this |
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|
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let screenX = cellSize.width |
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let screenY = cellSize.height |
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|
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let codePoint = character.codePointAt(0) |
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if (codePoint >= 0x2580 && codePoint <= 0x259F) { |
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// block elements
|
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ctx.beginPath() |
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const left = screenX |
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const top = screenY |
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const cw = cellSize.width |
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const ch = cellSize.height |
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const c2w = cellSize.width / 2 |
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const c2h = cellSize.height / 2 |
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|
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// http://www.fileformat.info/info/unicode/block/block_elements/utf8test.htm
|
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// 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C 0x0D 0x0E 0x0F
|
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// 0x2580 ▀ ▁ ▂ ▃ ▄ ▅ ▆ ▇ █ ▉ ▊ ▋ ▌ ▍ ▎ ▏
|
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// 0x2590 ▐ ░ ▒ ▓ ▔ ▕ ▖ ▗ ▘ ▙ ▚ ▛ ▜ ▝ ▞ ▟
|
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|
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if (codePoint === 0x2580) { |
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// upper half block >▀<
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ctx.rect(left, top, cw, c2h) |
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} else if (codePoint <= 0x2588) { |
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// lower n eighth block (increasing) >▁< to >█<
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let offset = (1 - (codePoint - 0x2580) / 8) * ch |
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ctx.rect(left, top + offset, cw, ch - offset) |
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} else if (codePoint <= 0x258F) { |
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// left n eighth block (decreasing) >▉< to >▏<
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let offset = (codePoint - 0x2588) / 8 * cw |
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ctx.rect(left, top, cw - offset, ch) |
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} else if (codePoint === 0x2590) { |
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// right half block >▐<
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ctx.rect(left + c2w, top, c2w, ch) |
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} else if (codePoint <= 0x2593) { |
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// shading >░< >▒< >▓<
|
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|
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// dot spacing by dividing cell size by a constant. This could be
|
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// reworked to always return a whole number, but that would require
|
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// prime factorization, and doing that without a loop would let you
|
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// take over the world, which is not within the scope of this project.
|
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let dotSpacingX, dotSpacingY, dotSize |
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if (codePoint === 0x2591) { |
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dotSpacingX = cw / 4 |
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dotSpacingY = ch / 10 |
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dotSize = 1 |
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} else if (codePoint === 0x2592) { |
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dotSpacingX = cw / 6 |
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dotSpacingY = cw / 10 |
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dotSize = 1 |
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} else if (codePoint === 0x2593) { |
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dotSpacingX = cw / 4 |
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dotSpacingY = cw / 7 |
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dotSize = 2 |
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} |
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|
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let alignRight = false |
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for (let dy = 0; dy < ch; dy += dotSpacingY) { |
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for (let dx = 0; dx < cw; dx += dotSpacingX) { |
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// prevent overflow
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let dotSizeY = Math.min(dotSize, ch - dy) |
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ctx.rect(left + (alignRight ? cw - dx - dotSize : dx), top + dy, dotSize, dotSizeY) |
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} |
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alignRight = !alignRight |
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} |
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} else if (codePoint === 0x2594) { |
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// upper one eighth block >▔<
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ctx.rect(left, top, cw, ch / 8) |
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} else if (codePoint === 0x2595) { |
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// right one eighth block >▕<
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ctx.rect(left + (7 / 8) * cw, top, cw / 8, ch) |
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} else if (codePoint === 0x2596) { |
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// left bottom quadrant >▖<
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ctx.rect(left, top + c2h, c2w, c2h) |
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} else if (codePoint === 0x2597) { |
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// right bottom quadrant >▗<
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ctx.rect(left + c2w, top + c2h, c2w, c2h) |
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} else if (codePoint === 0x2598) { |
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// left top quadrant >▘<
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ctx.rect(left, top, c2w, c2h) |
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} else if (codePoint === 0x2599) { |
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// left chair >▙<
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ctx.rect(left, top, c2w, ch) |
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ctx.rect(left + c2w, top + c2h, c2w, c2h) |
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} else if (codePoint === 0x259A) { |
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// quadrants lt rb >▚<
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ctx.rect(left, top, c2w, c2h) |
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ctx.rect(left + c2w, top + c2h, c2w, c2h) |
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} else if (codePoint === 0x259B) { |
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// left chair upside down >▛<
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ctx.rect(left, top, c2w, ch) |
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ctx.rect(left + c2w, top, c2w, c2h) |
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} else if (codePoint === 0x259C) { |
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// right chair upside down >▜<
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ctx.rect(left, top, cw, c2h) |
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ctx.rect(left + c2w, top + c2h, c2w, c2h) |
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} else if (codePoint === 0x259D) { |
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// right top quadrant >▝<
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ctx.rect(left + c2w, top, c2w, c2h) |
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} else if (codePoint === 0x259E) { |
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// quadrants lb rt >▞<
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ctx.rect(left, top + c2h, c2w, c2h) |
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ctx.rect(left + c2w, top, c2w, c2h) |
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} else if (codePoint === 0x259F) { |
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// right chair upside down >▟<
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ctx.rect(left, top + c2h, c2w, c2h) |
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ctx.rect(left + c2w, top, c2w, ch) |
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} |
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|
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ctx.fill() |
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} else if (codePoint >= 0xE0B0 && codePoint <= 0xE0B3) { |
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// powerline symbols, except branch, line, and lock. Basically, just the triangles
|
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ctx.beginPath() |
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|
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if (codePoint === 0xE0B0 || codePoint === 0xE0B1) { |
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// right-pointing triangle
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ctx.moveTo(screenX, screenY) |
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ctx.lineTo(screenX + cellSize.width, screenY + cellSize.height / 2) |
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ctx.lineTo(screenX, screenY + cellSize.height) |
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} else if (codePoint === 0xE0B2 || codePoint === 0xE0B3) { |
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// left-pointing triangle
|
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ctx.moveTo(screenX + cellSize.width, screenY) |
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ctx.lineTo(screenX, screenY + cellSize.height / 2) |
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ctx.lineTo(screenX + cellSize.width, screenY + cellSize.height) |
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} |
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|
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if (codePoint % 2 === 0) { |
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// triangle
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ctx.fill() |
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} else { |
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// chevron
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ctx.strokeStyle = ctx.fillStyle |
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ctx.stroke() |
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} |
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} else { |
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// Draw other characters using the text renderer
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ctx.fillText(character, cellSize.width * 1.5, cellSize.height * 1.5) |
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} |
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} |
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} |
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@ -0,0 +1,727 @@ |
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const EventEmitter = require('events') |
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const FontCache = require('./font_cache') |
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const { themes, getColor } = require('./themes') |
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const { |
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ATTR_FG, |
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ATTR_BG, |
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ATTR_BOLD, |
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ATTR_UNDERLINE, |
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ATTR_INVERSE, |
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ATTR_BLINK, |
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ATTR_ITALIC, |
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ATTR_STRIKE, |
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ATTR_OVERLINE, |
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ATTR_FAINT, |
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ATTR_FRAKTUR |
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} = require('./screen_attr_bits') |
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|
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// Some non-bold Fraktur symbols are outside the contiguous block
|
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const frakturExceptions = { |
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'C': '\u212d', |
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'H': '\u210c', |
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'I': '\u2111', |
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'R': '\u211c', |
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'Z': '\u2128' |
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} |
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|
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module.exports = class WebGLRenderer extends EventEmitter { |
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constructor (canvas) { |
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super() |
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|
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this.canvas = canvas |
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this.gl = this.canvas.getContext('webgl') || this.canvas.getContext('experimental-webgl') |
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if (!this.gl) throw new Error('No WebGL context') |
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|
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this.fontCache = new FontCache(this.gl) |
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|
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this._palette = null |
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this.defaultBG = 0 |
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this.defaultFG = 7 |
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|
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this._debug = null |
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|
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// screen data, considered immutable
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this.width = 0 |
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this.height = 0 |
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this.padding = 0 |
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this.charSize = { width: 0, height: 0 } |
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this.cellSize = { width: 0, height: 0 } |
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this.fonts = ['', '', '', ''] // normal, bold, italic, bold-italic
|
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this.screen = [] |
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this.screenFG = [] |
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this.screenBG = [] |
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this.screenAttrs = [] |
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this.screenSelection = [] |
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this.cursor = {} |
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this.reverseVideo = false |
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this.hasBlinkingCells = false |
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this.statusScreen = null |
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this.backgroundImage = null |
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|
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this.blinkStyleOn = false |
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this.blinkInterval = null |
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this.cursorBlinkOn = false |
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this.cursorBlinkInterval = null |
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|
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this.redrawLoop = false |
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this.resetDrawn(100, 100) |
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this.initTime = Date.now() |
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|
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this.init() |
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|
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// start loops and timers
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this.resetBlink() |
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this.resetCursorBlink() |
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this.startDrawLoop() |
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} |
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|
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render (reason, data) { |
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if ('hasBlinkingCells' in data && data.hasBlinkingCells !== this.hasBlinkingCells) { |
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if (data.hasBlinkingCells) this.resetBlink() |
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else clearInterval(this.blinkInterval) |
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} |
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|
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Object.assign(this, data) |
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this.scheduleDraw(reason) |
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} |
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resetDrawn (width, height) { |
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if (this.backgroundImage) { |
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this.gl.clearColor(0, 0, 0, 0) |
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this.canvas.style.backgroundColor = getColor(this.defaultBG, this.palette) |
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} else { |
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this.gl.clearColor(...this.getColor(this.defaultBG)) |
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this.canvas.style.backgroundColor = null |
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} |
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if (width && height) { |
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this.gl.viewport(0, 0, width, height) |
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} |
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this.gl.enable(this.gl.BLEND) |
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this.gl.blendFunc(this.gl.SRC_ALPHA, this.gl.ONE_MINUS_SRC_ALPHA) |
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} |
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|
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/** |
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* The color palette. Should define 16 colors in an array. |
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* @type {string[]} |
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*/ |
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get palette () { |
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return this._palette || themes[0] |
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} |
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|
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/** @type {string[]} */ |
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set palette (palette) { |
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if (this._palette !== palette) { |
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this._palette = palette |
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this.emit('palette-update', palette) |
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this.scheduleDraw('palette') |
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} |
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} |
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|
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getCharWidthFor (font) { |
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this.fontCache.ctx.font = font |
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return Math.floor(this.fontCache.ctx.measureText(' ').width) |
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} |
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|
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loadTheme (i) { |
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if (i in themes) this.palette = themes[i] |
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} |
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|
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setDefaultColors (fg, bg) { |
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if (fg !== this.defaultFG || bg !== this.defaultBG) { |
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this.defaultFG = fg |
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this.defaultBG = bg |
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this.scheduleDraw('default-colors') |
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|
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// full bg with default color (goes behind the image)
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this.canvas.style.backgroundColor = this.getColor(bg) |
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} |
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} |
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|
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/** |
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* Schedule a draw in the next millisecond |
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* @param {string} why - the reason why the draw occured (for debugging) |
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* @param {number} [aggregateTime] - time to wait for more scheduleDraw calls |
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* to occur. 1 ms by default. |
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*/ |
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scheduleDraw (why, aggregateTime = 1) { |
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clearTimeout(this._scheduledDraw) |
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this._scheduledDraw = setTimeout(() => this.draw(why), aggregateTime) |
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} |
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|
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/** |
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* Returns the specified color. If `i` is in the palette, it will return the |
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* palette color. If `i` is between 16 and 255, it will return the 256color |
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* value. If `i` is larger than 255, it will return an RGB color value. If `i` |
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* is -1 (foreground) or -2 (background), it will return the selection colors. |
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* @param {number} i - the color |
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* @returns {string} the CSS color |
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*/ |
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getColor (i) { |
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return WebGLRenderer.colorToRGBA(getColor(i, this.palette)) |
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} |
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|
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/** |
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* Resets the cursor blink to on and restarts the timer |
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*/ |
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resetCursorBlink () { |
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this.cursorBlinkOn = true |
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clearInterval(this.cursorBlinkInterval) |
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this.cursorBlinkInterval = setInterval(() => { |
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this.cursorBlinkOn = this.cursor.blinking ? !this.cursorBlinkOn : true |
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if (this.cursor.blinking) this.scheduleDraw('cursor-blink') |
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}, 500) |
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} |
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|
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/** |
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* Resets the blink style to on and restarts the timer |
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*/ |
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resetBlink () { |
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this.blinkStyleOn = true |
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clearInterval(this.blinkInterval) |
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let intervals = 0 |
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this.blinkInterval = setInterval(() => { |
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if (this.blinkingCellCount <= 0) return |
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|
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intervals++ |
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if (intervals >= 4 && this.blinkStyleOn) { |
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this.blinkStyleOn = false |
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intervals = 0 |
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this.scheduleDraw('blink-style') |
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} else if (intervals >= 1 && !this.blinkStyleOn) { |
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this.blinkStyleOn = true |
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intervals = 0 |
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this.scheduleDraw('blink-style') |
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} |
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}, 200) |
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} |
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|
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compileShader (vertex, fragment) { |
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const { gl } = this |
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let vert = gl.createShader(gl.VERTEX_SHADER) |
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gl.shaderSource(vert, vertex) |
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gl.compileShader(vert) |
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let frag = gl.createShader(gl.FRAGMENT_SHADER) |
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gl.shaderSource(frag, fragment) |
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gl.compileShader(frag) |
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if (!gl.getShaderParameter(vert, gl.COMPILE_STATUS) || !gl.getShaderParameter(frag, gl.COMPILE_STATUS)) { |
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console.error(gl.getShaderInfoLog(vert), gl.getShaderInfoLog(frag)) |
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gl.deleteShader(vert) |
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gl.deleteShader(frag) |
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throw new Error('Shader compile error') |
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} |
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|
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let shader = gl.createProgram() |
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gl.attachShader(shader, vert) |
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gl.attachShader(shader, frag) |
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gl.linkProgram(shader) |
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|
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if (!gl.getProgramParameter(shader, gl.LINK_STATUS)) { |
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console.error(gl.getProgramInfoLog(shader)) |
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throw new Error('Shader link error') |
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} |
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|
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return shader |
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} |
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|
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init () { |
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const { gl } = this |
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|
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let bgShader = this.compileShader(` |
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precision mediump float; |
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attribute vec2 position; |
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uniform mat4 projection; |
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uniform vec2 char_pos; |
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uniform vec2 extend; |
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void main() { |
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vec2 scale = vec2(1.0 + abs(extend.x), 1.0 + abs(extend.y)); |
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vec2 offset = min(vec2(0.0, 0.0), extend); |
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gl_Position = projection * vec4(char_pos + offset + scale * position, 0.0, 1.0); |
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} |
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`, ` |
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precision highp float; |
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uniform vec4 color; |
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void main() { |
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gl_FragColor = color; |
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} |
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`)
|
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|
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let charShader = this.compileShader(` |
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precision mediump float; |
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attribute vec2 position; |
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uniform mat4 projection; |
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uniform vec2 char_pos; |
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uniform bool clip; |
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varying highp vec2 tex_coord; |
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varying vec4 screen_pos; |
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void main() { |
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if (clip) { |
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gl_Position = projection * vec4(char_pos + position, 0.0, 1.0); |
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screen_pos = vec4(position, 0.0, 1.0); |
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tex_coord = position / 3.0 + vec2(1.0 / 3.0, 1.0 / 3.0); |
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} else { |
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gl_Position = projection * vec4(char_pos - vec2(1.0, 1.0) + 3.0 * position, 0.0, 1.0); |
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screen_pos = vec4(3.0 * position - vec2(1.0, 1.0), 0.0, 1.0); |
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tex_coord = position; |
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} |
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} |
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`, ` |
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precision highp float; |
||||
uniform vec4 color; |
||||
uniform sampler2D texture; |
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uniform bool faint; |
||||
uniform bool overline; |
||||
uniform bool strike; |
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uniform bool underline; |
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varying highp vec2 tex_coord; |
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varying vec4 screen_pos; |
||||
void main() { |
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gl_FragColor = texture2D(texture, tex_coord) * color; |
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if (screen_pos.x >= 0.0 && screen_pos.x <= 1.0) { |
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if (faint) { |
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gl_FragColor.a /= 2.0; |
||||
} |
||||
if (overline) { |
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if (screen_pos.y >= 0.0 && screen_pos.y <= 0.05) gl_FragColor = color; |
||||
} |
||||
if (strike) { |
||||
if (screen_pos.y >= 0.475 && screen_pos.y <= 0.525) gl_FragColor = color; |
||||
} |
||||
if (underline) { |
||||
if (screen_pos.y >= 0.95 && screen_pos.y <= 1.0) gl_FragColor = color; |
||||
} |
||||
} |
||||
} |
||||
`)
|
||||
|
||||
let fboShader = this.compileShader(` |
||||
precision mediump float; |
||||
attribute vec2 position; |
||||
uniform mat4 projection; |
||||
varying highp vec2 tex_coord; |
||||
void main() { |
||||
gl_Position = projection * vec4(position, 0.0, 1.0); |
||||
tex_coord = position; |
||||
} |
||||
`, ` |
||||
precision highp float; |
||||
uniform sampler2D texture; |
||||
uniform vec2 pixel_scale; |
||||
uniform float time; |
||||
varying highp vec2 tex_coord; |
||||
float hue_to_rgb (float p, float q, float t) { |
||||
if (t < 0.0) t += 1.0; |
||||
if (t > 1.0) t -= 1.0; |
||||
if (t < 1.0 / 6.0) return p + (q - p) * 6.0 * t; |
||||
if (t < 0.5) return q; |
||||
if (t < 2.0 / 3.0) return p + (q - p) * (2.0 / 3.0 - t) * 6.0; |
||||
return p; |
||||
} |
||||
vec4 hsl_to_rgb (vec4 hsl) { |
||||
vec4 rgb = vec4(0); |
||||
rgb.a = hsl.a; |
||||
hsl.x = mod(hsl.x, 1.0); |
||||
if (hsl.y == 0.0) { |
||||
rgb.r = hsl.z; |
||||
rgb.g = hsl.z; |
||||
rgb.b = hsl.z; |
||||
} else { |
||||
float q = hsl.z < 0.5 ? hsl.z * (1.0 + hsl.y) : hsl.z + hsl.y - hsl.z * hsl.y; |
||||
float p = 2.0 * hsl.z - q; |
||||
rgb.r = hue_to_rgb(p, q, hsl.x + 1.0 / 3.0); |
||||
rgb.g = hue_to_rgb(p, q, hsl.x); |
||||
rgb.b = hue_to_rgb(p, q, hsl.x - 1.0 / 3.0); |
||||
} |
||||
return rgb; |
||||
} |
||||
vec4 rgb_to_hsl (vec4 rgb) { |
||||
float max_rgb = max(rgb.r, max(rgb.g, rgb.b)); |
||||
float min_rgb = min(rgb.r, min(rgb.g, rgb.b)); |
||||
float lightness = (max_rgb + min_rgb) / 2.0; |
||||
float hue = 0.0, saturation = 0.0; |
||||
if (max_rgb != min_rgb) { |
||||
float vd = max_rgb - min_rgb; |
||||
saturation = lightness > 0.5 ? vd / (2.0 - max_rgb - min_rgb) : vd / (max_rgb + min_rgb); |
||||
if (max_rgb == rgb.r) hue = (rgb.g - rgb.b) / vd + (rgb.g < rgb.b ? 6.0 : 0.0); |
||||
else if (max_rgb == rgb.g) hue = (rgb.b - rgb.r) / vd + 2.0; |
||||
else if (max_rgb == rgb.b) hue = (rgb.r - rgb.g) / vd + 4.0; |
||||
hue /= 6.0; |
||||
} |
||||
return vec4(hue, saturation, lightness, rgb.a); |
||||
} |
||||
vec2 bulge (vec2 v) { |
||||
vec2 norm = v * 2.0 - 1.0; |
||||
float hypot = length(norm); |
||||
return ((norm * (hypot / 4.0 + 1.0) / 1.25) + 1.0) / 2.0; |
||||
} |
||||
void main() { |
||||
// gl_FragColor = texture2D(texture, tex_coord);
|
||||
|
||||
// bulge, lines, bloom
|
||||
vec4 sum = vec4(0); |
||||
for (int i = -2; i <= 2; i++) { |
||||
for (int j = -2; j <= 2; j++) { |
||||
sum += texture2D(texture, bulge(tex_coord + vec2(i, j) * pixel_scale)) * 0.07; |
||||
} |
||||
} |
||||
gl_FragColor = sum * sum + texture2D(texture, bulge(tex_coord)) * (0.5 * sin(bulge(tex_coord).y / pixel_scale.y) + 0.5); |
||||
|
||||
/* CRT-ish effect (requires draw on every animation frame!) |
||||
vec4 sum = vec4(0); |
||||
|
||||
for (int i = -4; i <= 4; i++) { |
||||
for (int j = -4; j <= 4; j++) { |
||||
sum += texture2D(texture, tex_coord + vec2(j, i) * pixel_scale) * 0.07; |
||||
} |
||||
} |
||||
float factor = 0.05 + 0.02 * sin(time * 5.0); |
||||
if (mod(tex_coord.y / pixel_scale.y, 10.0) < 5.0) { |
||||
factor += 0.1; |
||||
} |
||||
float beam_y = (mod(-time, 9.0) - 1.5) / 6.0; |
||||
if (abs(tex_coord.y - beam_y) < 0.05) { |
||||
factor += 0.2 * cos((tex_coord.y - beam_y) / 0.05 * 1.57); |
||||
} |
||||
gl_FragColor = sum * sum * factor + texture2D(texture, tex_coord); */ |
||||
} |
||||
`)
|
||||
|
||||
this.bgShader = { |
||||
shader: bgShader, |
||||
attributes: { |
||||
position: gl.getAttribLocation(bgShader, 'position') |
||||
}, |
||||
uniforms: { |
||||
projection: gl.getUniformLocation(bgShader, 'projection'), |
||||
charPos: gl.getUniformLocation(bgShader, 'char_pos'), |
||||
extend: gl.getUniformLocation(bgShader, 'extend'), |
||||
color: gl.getUniformLocation(bgShader, 'color') |
||||
} |
||||
} |
||||
|
||||
this.charShader = { |
||||
shader: charShader, |
||||
attributes: { |
||||
position: gl.getAttribLocation(charShader, 'position') |
||||
}, |
||||
uniforms: { |
||||
projection: gl.getUniformLocation(charShader, 'projection'), |
||||
charPos: gl.getUniformLocation(charShader, 'char_pos'), |
||||
color: gl.getUniformLocation(charShader, 'color'), |
||||
texture: gl.getUniformLocation(charShader, 'texture'), |
||||
clip: gl.getUniformLocation(charShader, 'clip'), |
||||
faint: gl.getUniformLocation(charShader, 'faint'), |
||||
overline: gl.getUniformLocation(charShader, 'overline'), |
||||
strike: gl.getUniformLocation(charShader, 'strike'), |
||||
underline: gl.getUniformLocation(charShader, 'underline') |
||||
} |
||||
} |
||||
|
||||
this.fboShader = { |
||||
shader: fboShader, |
||||
attributes: { |
||||
position: gl.getAttribLocation(fboShader, 'position') |
||||
}, |
||||
uniforms: { |
||||
projection: gl.getUniformLocation(fboShader, 'projection'), |
||||
pixelScale: gl.getUniformLocation(fboShader, 'pixel_scale'), |
||||
time: gl.getUniformLocation(fboShader, 'time'), |
||||
texture: gl.getUniformLocation(fboShader, 'texture') |
||||
} |
||||
} |
||||
|
||||
let buffer = gl.createBuffer() |
||||
gl.bindBuffer(gl.ARRAY_BUFFER, buffer) |
||||
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([ |
||||
1, 1, |
||||
0, 1, |
||||
1, 0, |
||||
0, 0 |
||||
]), gl.STATIC_DRAW) |
||||
this.squareBuffer = buffer |
||||
this.useShader = (shader, projection) => { |
||||
gl.vertexAttribPointer(shader.attributes.position, 2, gl.FLOAT, false, 0, 0) |
||||
gl.enableVertexAttribArray(shader.attributes.position) |
||||
gl.useProgram(shader.shader) |
||||
|
||||
gl.uniformMatrix4fv(shader.uniforms.projection, false, projection) |
||||
} |
||||
this.drawSquare = () => { |
||||
gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4) |
||||
} |
||||
|
||||
// frame buffers
|
||||
|
||||
let maxBuffers = gl.getParameter(gl.getExtension('WEBGL_draw_buffers').MAX_COLOR_ATTACHMENTS_WEBGL) |
||||
let createBuffer = i => { |
||||
let buffer = gl.createFramebuffer() |
||||
let texture = gl.createTexture() |
||||
|
||||
gl.bindFramebuffer(gl.FRAMEBUFFER, buffer) |
||||
gl.bindTexture(gl.TEXTURE_2D, texture) |
||||
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, null) |
||||
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0 + i, gl.TEXTURE_2D, texture, 0) |
||||
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR) |
||||
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE) |
||||
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE) |
||||
|
||||
return { buffer, texture } |
||||
} |
||||
|
||||
if (maxBuffers >= 2) { |
||||
this.buffers = { |
||||
drawing: createBuffer(0), |
||||
display: createBuffer(1) |
||||
} |
||||
} else { |
||||
let buffer = createBuffer(0) |
||||
this.buffers = { drawing: buffer, display: buffer } |
||||
} |
||||
} |
||||
|
||||
draw (reason) { |
||||
const { gl, width, height, padding, devicePixelRatio, statusScreen } = this |
||||
let { screen, screenFG, screenBG, screenAttrs } = this |
||||
|
||||
// ;[this.buffers.drawing, this.buffers.display] = [this.buffers.display, this.buffers.drawing]
|
||||
|
||||
let drawingBuffer = this.buffers.drawing |
||||
gl.bindFramebuffer(gl.FRAMEBUFFER, drawingBuffer.buffer) |
||||
gl.activeTexture(gl.TEXTURE0) |
||||
gl.bindTexture(gl.TEXTURE_2D, drawingBuffer.texture) |
||||
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.drawingBufferWidth, gl.drawingBufferHeight, 0, gl.RGBA, gl.UNSIGNED_BYTE, null) |
||||
|
||||
if (statusScreen) { |
||||
this.redrawLoop = true |
||||
|
||||
screen = new Array(width * height).fill(' ') |
||||
screenFG = new Array(width * height).fill(this.defaultFG) |
||||
screenBG = new Array(width * height).fill(this.defaultBG) |
||||
screenAttrs = new Array(width * height).fill(ATTR_FG | ATTR_BG) |
||||
|
||||
let text = statusScreen.title |
||||
for (let i = 0; i < Math.min(width * height, text.length); i++) { |
||||
screen[i] = text[i] |
||||
} |
||||
if (statusScreen.loading) { |
||||
let t = Date.now() / 1000 |
||||
|
||||
for (let i = width; i < Math.min(width * height, width + 8); i++) { |
||||
let offset = ((t * 12) - i) % 12 |
||||
let value = Math.max(0.2, 1 - offset / 3) * 255 |
||||
screenFG[i] = 256 + value + (value << 8) + (value << 16) |
||||
screen[i] = '*' |
||||
} |
||||
} |
||||
} else this.redrawLoop = false |
||||
|
||||
if (this.debug && this._debug) this._debug.drawStart(reason) |
||||
|
||||
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT) |
||||
this.fontCache.cellSize = this.cellSize |
||||
this.fontCache.dp = devicePixelRatio |
||||
|
||||
let paddingX = padding / this.cellSize.width |
||||
let paddingY = padding / this.cellSize.height |
||||
|
||||
let projection = new Float32Array([ |
||||
2 / (width + 2 * paddingX), 0, 0, 0, |
||||
0, -2 / (height + 2 * paddingY), 0, 0, |
||||
0, 0, 1, 0, |
||||
-1 + 2 * paddingX / width, 1 - 2 * paddingY / height, 0, 1 |
||||
]) |
||||
|
||||
// draw background
|
||||
this.useShader(this.bgShader, projection) |
||||
|
||||
let textCells = {} |
||||
|
||||
for (let cell = 0; cell < width * height; cell++) { |
||||
let x = cell % width |
||||
let y = Math.floor(cell / width) |
||||
let isCursor = this.cursorBlinkOn && |
||||
this.cursor.x === x && |
||||
this.cursor.y === y && |
||||
this.cursor.visible |
||||
|
||||
let text = screen[cell] |
||||
let fg = screenFG[cell] | 0 |
||||
let bg = screenBG[cell] | 0 |
||||
let attrs = screenAttrs[cell] | 0 |
||||
let inSelection = this.screenSelection[cell] |
||||
|
||||
if (!(cell in screen)) continue |
||||
if (statusScreen) isCursor = false |
||||
|
||||
let isDefaultBG = false |
||||
|
||||
if (!(attrs & ATTR_FG)) fg = this.defaultFG |
||||
if (!(attrs & ATTR_BG)) { |
||||
bg = this.defaultBG |
||||
isDefaultBG = true |
||||
} |
||||
|
||||
if (attrs & ATTR_INVERSE) [fg, bg] = [bg, fg] // swap - reversed character colors
|
||||
if (this.reverseVideo) [fg, bg] = [bg, fg] // swap - reversed all screen
|
||||
|
||||
if (attrs & ATTR_BLINK && !this.blinkStyleOn) { |
||||
// blinking is enabled and blink style is off
|
||||
// set text to nothing so drawCharacter only draws decoration
|
||||
text = ' ' |
||||
} |
||||
|
||||
if (inSelection) { |
||||
fg = -1 |
||||
bg = -2 |
||||
} |
||||
|
||||
if (!this.backgroundImage || !isDefaultBG) { |
||||
gl.uniform2f(this.bgShader.uniforms.charPos, x, y) |
||||
gl.uniform4f(this.bgShader.uniforms.color, ...this.getColor(bg)) |
||||
|
||||
let extendX = 0 |
||||
let extendY = 0 |
||||
|
||||
if (x === 0) extendX = -1 |
||||
if (x === width - 1) extendX = 1 |
||||
if (y === 0) extendY = -1 |
||||
if (y === height - 1) extendY = 1 |
||||
|
||||
gl.uniform2f(this.bgShader.uniforms.extend, extendX, extendY) |
||||
|
||||
this.drawSquare() |
||||
} |
||||
|
||||
if (text.trim() || isCursor || attrs) { |
||||
let fontIndex = 0 |
||||
if (attrs & ATTR_BOLD) fontIndex |= 1 |
||||
if (attrs & ATTR_ITALIC) fontIndex |= 2 |
||||
let font = this.fonts[fontIndex] |
||||
if (attrs & ATTR_FRAKTUR) text = WebGLRenderer.alphaToFraktur(text) |
||||
let type = font + text |
||||
|
||||
if (!textCells[type]) textCells[type] = [] |
||||
textCells[type].push({ x, y, text, font, fg, bg, attrs, isCursor }) |
||||
} |
||||
} |
||||
|
||||
this.useShader(this.charShader, projection) |
||||
gl.activeTexture(gl.TEXTURE1) |
||||
|
||||
for (let key in textCells) { |
||||
let { font, text } = textCells[key][0] |
||||
let texture = this.fontCache.getChar(font, text) |
||||
gl.bindTexture(gl.TEXTURE_2D, texture) |
||||
gl.uniform1i(this.charShader.uniforms.texture, 1) |
||||
|
||||
for (let cell of textCells[key]) { |
||||
let { x, y, fg, bg, attrs, isCursor } = cell |
||||
|
||||
gl.uniform2f(this.charShader.uniforms.charPos, x, y) |
||||
gl.uniform4f(this.charShader.uniforms.color, ...this.getColor(fg)) |
||||
|
||||
gl.uniform1i(this.charShader.uniforms.faint, (attrs & ATTR_FAINT) > 0) |
||||
gl.uniform1i(this.charShader.uniforms.overline, (attrs & ATTR_OVERLINE) > 0) |
||||
gl.uniform1i(this.charShader.uniforms.strike, (attrs & ATTR_STRIKE) > 0) |
||||
gl.uniform1i(this.charShader.uniforms.underline, (attrs & ATTR_UNDERLINE) > 0) |
||||
|
||||
this.drawSquare() |
||||
|
||||
if (isCursor) { |
||||
if (fg === bg) { |
||||
fg = 7 |
||||
bg = 0 |
||||
} |
||||
|
||||
this.useShader(this.bgShader, projection) |
||||
gl.uniform2f(this.bgShader.uniforms.extend, 0, 0) |
||||
gl.uniform2f(this.bgShader.uniforms.charPos, x, y) |
||||
gl.uniform4f(this.bgShader.uniforms.color, ...this.getColor(fg)) |
||||
this.drawSquare() |
||||
|
||||
this.useShader(this.charShader, projection) |
||||
gl.uniform4f(this.charShader.uniforms.color, ...this.getColor(bg)) |
||||
gl.uniform1i(this.charShader.uniforms.clip, true) |
||||
this.drawSquare() |
||||
gl.uniform1i(this.charShader.uniforms.clip, false) |
||||
} |
||||
} |
||||
} |
||||
|
||||
gl.bindFramebuffer(gl.FRAMEBUFFER, null) |
||||
this.drawFrame() |
||||
|
||||
if (this.debug && this._debug) this._debug.drawEnd() |
||||
} |
||||
|
||||
drawFrame () { |
||||
const { gl } = this |
||||
let drawingBuffer = this.buffers.drawing |
||||
|
||||
gl.clear(gl.COLOR_BUFFER_BIT) |
||||
gl.activeTexture(gl.TEXTURE0) |
||||
gl.bindTexture(gl.TEXTURE_2D, drawingBuffer.texture) |
||||
this.useShader(this.fboShader, [ |
||||
2, 0, 0, 0, |
||||
0, 2, 0, 0, |
||||
0, 0, 1, 0, |
||||
-1, -1, 0, 1 |
||||
]) |
||||
gl.uniform2f(this.fboShader.uniforms.pixelScale, 1 / gl.drawingBufferWidth, 1 / gl.drawingBufferHeight) |
||||
gl.uniform1i(this.fboShader.uniforms.texture, 0) |
||||
gl.uniform1f(this.fboShader.uniforms.time, ((Date.now() - this.initTime) / 1000) % 86400) |
||||
this.drawSquare() |
||||
} |
||||
|
||||
startDrawLoop () { |
||||
if (this._drawTimerThread) return |
||||
let threadID = Math.random().toString(36) |
||||
this._drawTimerThread = threadID |
||||
this.drawTimerLoop(threadID) |
||||
} |
||||
|
||||
stopDrawLoop () { |
||||
this._drawTimerThread = null |
||||
} |
||||
|
||||
drawTimerLoop (threadID) { |
||||
if (!threadID || threadID !== this._drawTimerThread) return |
||||
window.requestAnimationFrame(() => this.drawTimerLoop(threadID)) |
||||
if (this.redrawLoop) this.draw('draw-loop') |
||||
// uncomment for an update every frame (GPU-intensive)
|
||||
// (also, lots of errors in Chrome. TODO: investigate)
|
||||
// this.drawFrame()
|
||||
} |
||||
|
||||
/** |
||||
* Converts an alphabetic character to its fraktur variant. |
||||
* @param {string} character - the character |
||||
* @returns {string} the converted character |
||||
*/ |
||||
static alphaToFraktur (character) { |
||||
if (character >= 'a' && character <= 'z') { |
||||
character = String.fromCodePoint(0x1d51e - 0x61 + character.charCodeAt(0)) |
||||
} else if (character >= 'A' && character <= 'Z') { |
||||
character = frakturExceptions[character] || String.fromCodePoint(0x1d504 - 0x41 + character.charCodeAt(0)) |
||||
} |
||||
return character |
||||
} |
||||
|
||||
static colorToRGBA (color) { |
||||
color = color.substr(1) |
||||
if (color.length === 3) { |
||||
return [ |
||||
parseInt(color[0], 16) * 0x11 / 0xff, |
||||
parseInt(color[1], 16) * 0x11 / 0xff, |
||||
parseInt(color[2], 16) * 0x11 / 0xff, |
||||
1 |
||||
] |
||||
} else { |
||||
return [ |
||||
parseInt(color.substr(0, 2), 16) / 0xff, |
||||
parseInt(color.substr(2, 2), 16) / 0xff, |
||||
parseInt(color.substr(4, 2), 16) / 0xff, |
||||
1 |
||||
] |
||||
} |
||||
} |
||||
} |
||||
@ -1,39 +0,0 @@ |
||||
<div class="Box fold"> |
||||
<h2>Remote GPIO Control</h2> |
||||
|
||||
<div class="Row v"> |
||||
<p> |
||||
ESPTerm provides a simple API to remotely control and read GPIO pins GPIO2, GPIO4, and GPIO5. |
||||
The main use of this API is to remotely reset a device that communicates with ESPTerm |
||||
through the UART. |
||||
</p> |
||||
|
||||
<p> |
||||
GPIO2 is normally used for debug UART, so when used as GPIO, debug logging is disabled. You |
||||
can configure the pin functions in <a href="<?= url('cfg_system') ?>">System Settings</a>.
|
||||
</p> |
||||
|
||||
<p> |
||||
The GPIO control endpoint is `/api/v1/gpio`, with optional GET arguments: |
||||
</p> |
||||
|
||||
<ul> |
||||
<li>`do2=<i>x</i>` - set GPIO2 level. <i>x</i> can be `0`, `1`, or `t` to toggle the pin. |
||||
<li>`do4=<i>x</i>` - set GPIO4 level |
||||
<li>`do5=<i>x</i>` - set GPIO5 level |
||||
<li>`pulse=<i>ms</i>` - the command starts a pulse. After the given amount of time |
||||
(milliseconds) has elapsed, the pins are set to the opposite levels than what was specified |
||||
(in the case of toggle, the original pin state) |
||||
</ul> |
||||
|
||||
<p> |
||||
A quick example: <a href="/api/v1/gpio?do4=1&pulse=500">`/api/v1/gpio?do4=1&pulse=500`</a> |
||||
sends a 500ms long positive pulse on GPIO4. |
||||
</p> |
||||
|
||||
<p> |
||||
The GPIO endpoint always returns a JSON object like this: `{"io2":0,"io4":1,"io5":0}`, showing |
||||
the current input levels. Input reading works always, regardless of the GPIO settings. |
||||
</p> |
||||
</div> |
||||
</div> |
||||
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Reference in new issue