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Copy pathwebglImageNodeProgram.js
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420 lines (355 loc) · 14.8 KB
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/**
* @fileOverview Defines an image nodes for webglGraphics class.
* Shape of nodes is sqare.
*
* @author Andrei Kashcha (aka anvaka) / http://anvaka.blogspot.com
*/
/*global Viva, Float32Array, window*/
/*jslint sloppy: true, vars: true, plusplus: true, bitwise: true, nomen: true */
/**
* Single texture in the webglAtlas.
*/
Viva.Graph.View.Texture = function (size) {
this.canvas = window.document.createElement('canvas');
this.ctx = this.canvas.getContext('2d');
this.isDirty = false;
this.canvas.width = this.canvas.height = size;
};
/**
* My naive implementation of textures atlas. It allows clients to load
* multimple images into atlas and get canvas representing all of them.
*
* @param tilesPerTexture - indicates how many images can be loaded to one
* texture of the atlas. If number of loaded images exceeds this
* parameter a new canvas will be created.
*/
Viva.Graph.View.webglAtlas = function (tilesPerTexture) {
var tilesPerRow = Math.sqrt(tilesPerTexture || 1024) << 0,
tileSize = tilesPerRow,
lastLoadedIdx = 1,
loadedImages = {},
dirtyTimeoutId,
skipedDirty = 0,
textures = [],
trackedUrls = [],
that,
findNearestPowerOf2 = function (n) {
// TODO: probably don't need this anymore
// http://en.wikipedia.org/wiki/Power_of_two#Algorithm_to_round_up_to_power_of_two
n = n << 0; // make it integer
n = n - 1;
n = n | (n >> 1);
n = n | (n >> 2);
n = n | (n >> 4);
n = n | (n >> 8);
n = n | (n >> 16);
return n + 1;
},
isPowerOf2 = function (n) {
return (n & (n - 1)) === 0;
},
createTexture = function () {
var texture = new Viva.Graph.View.Texture(tilesPerRow * tileSize);
textures.push(texture);
},
getTileCoordinates = function (absolutePosition) {
var textureNumber = (absolutePosition / tilesPerTexture) << 0,
localTileNumber = (absolutePosition % tilesPerTexture),
row = (localTileNumber / tilesPerRow) << 0,
col = (localTileNumber % tilesPerRow);
return {textureNumber : textureNumber, row : row, col: col};
},
markDirtyNow = function () {
that.isDirty = true;
skipedDirty = 0;
dirtyTimeoutId = null;
},
markDirty = function () {
// delay this call, since it results in texture reload
if (dirtyTimeoutId) {
window.clearTimeout(dirtyTimeoutId);
skipedDirty += 1;
dirtyTimeoutId = null;
}
if (skipedDirty > 10) {
markDirtyNow();
} else {
dirtyTimeoutId = window.setTimeout(markDirtyNow, 400);
}
},
copy = function (from, to) {
var fromCanvas = textures[from.textureNumber].canvas,
toCtx = textures[to.textureNumber].ctx,
x = to.col * tileSize,
y = to.row * tileSize;
toCtx.drawImage(fromCanvas, from.col * tileSize, from.row * tileSize, tileSize, tileSize, x, y, tileSize, tileSize);
textures[from.textureNumber].isDirty = true;
textures[to.textureNumber].isDirty = true;
},
drawAt = function (tileNumber, img, callback) {
var tilePosition = getTileCoordinates(tileNumber),
coordinates = { offset : tileNumber };
if (tilePosition.textureNumber >= textures.length) {
createTexture();
}
var currentTexture = textures[tilePosition.textureNumber];
currentTexture.ctx.drawImage(img, tilePosition.col * tileSize, tilePosition.row * tileSize, tileSize, tileSize);
trackedUrls[tileNumber] = img.src;
loadedImages[img.src] = coordinates;
currentTexture.isDirty = true;
callback(coordinates);
};
if (!isPowerOf2(tilesPerTexture)) {
throw 'Tiles per texture should be power of two.';
}
// this is the return object
that = {
/**
* indicates whether atlas has changed texture in it. If true then
* some of the textures has isDirty flag set as well.
*/
isDirty : false,
/**
* Clears any signs of atlas changes.
*/
clearDirty : function () {
var i;
this.isDirty = false;
for (i = 0; i < textures.length; ++i) {
textures[i].isDirty = false;
}
},
/**
* Removes given url from colleciton of tiles in the atlas.
*/
remove : function (imgUrl) {
var coordinates = loadedImages[imgUrl];
if (!coordinates) { return false; }
delete loadedImages[imgUrl];
lastLoadedIdx -= 1;
if (lastLoadedIdx === coordinates.offset) {
return true; // Ignore if it's last image in the whole set.
}
var tileToRemove = getTileCoordinates(coordinates.offset),
lastTileInSet = getTileCoordinates(lastLoadedIdx);
copy(lastTileInSet, tileToRemove);
var replacedOffset = loadedImages[trackedUrls[lastLoadedIdx]];
replacedOffset.offset = coordinates.offset;
trackedUrls[coordinates.offset] = trackedUrls[lastLoadedIdx];
markDirty();
return true;
},
/**
* Gets all textures in the atlas.
*/
getTextures : function () {
return textures; // I trust you...
},
/**
* Gets coordinates of the given image in the atlas. Coordinates is an object:
* {offset : int } - where offset is an absolute position of the image in the
* atlas.
*
* Absolute means it can be larger than tilesPerTexture parameter, and in that
* case clients should get next texture in getTextures() collection.
*/
getCoordinates : function (imgUrl) {
return loadedImages[imgUrl];
},
/**
* Asynchronously Loads the image to the atlas. Cross-domain security
* limitation applies.
*/
load : function (imgUrl, callback) {
if (loadedImages.hasOwnProperty(imgUrl)) {
callback(loadedImages[imgUrl]);
} else {
var img = new window.Image(),
imgId = lastLoadedIdx,
that = this;
lastLoadedIdx += 1;
img.crossOrigin = "anonymous";
img.onload = function () {
markDirty();
drawAt(imgId, img, callback);
};
img.src = imgUrl;
}
}
};
return that;
};
/**
* Defines simple UI for nodes in webgl renderer. Each node is rendered as an image.
*/
Viva.Graph.View.webglImageNodeProgram = function () {
var ATTRIBUTES_PER_PRIMITIVE = 18,
nodesFS = [
'precision mediump float;',
'varying vec4 color;',
'varying vec3 vTextureCoord;',
'uniform sampler2D u_sampler0;',
'uniform sampler2D u_sampler1;',
'uniform sampler2D u_sampler2;',
'uniform sampler2D u_sampler3;',
'void main(void) {',
' if (vTextureCoord.z == 0.) {',
' gl_FragColor = texture2D(u_sampler0, vTextureCoord.xy);',
' } else if (vTextureCoord.z == 1.) {',
' gl_FragColor = texture2D(u_sampler1, vTextureCoord.xy);',
' } else if (vTextureCoord.z == 2.) {',
' gl_FragColor = texture2D(u_sampler2, vTextureCoord.xy);',
' } else if (vTextureCoord.z == 3.) {',
' gl_FragColor = texture2D(u_sampler3, vTextureCoord.xy);',
' } else { gl_FragColor = vec4(0, 1, 0, 1); }',
'}'].join('\n'),
nodesVS = [
'attribute vec2 a_vertexPos;',
'attribute float a_customAttributes;',
'uniform vec2 u_screenSize;',
'uniform mat4 u_transform;',
'uniform float u_tilesPerTexture;',
'varying vec3 vTextureCoord;',
'void main(void) {',
' gl_Position = u_transform * vec4(a_vertexPos/u_screenSize, 0, 1);',
'float corner = mod(a_customAttributes, 4.);',
'float tileIndex = mod(floor(a_customAttributes / 4.), u_tilesPerTexture);',
'float tilesPerRow = sqrt(u_tilesPerTexture);',
'float tileSize = 1./tilesPerRow;',
'float tileColumn = mod(tileIndex, tilesPerRow);',
'float tileRow = floor(tileIndex/tilesPerRow);',
'if(corner == 0.0) {',
' vTextureCoord.xy = vec2(0, 1);',
'} else if(corner == 1.0) {',
' vTextureCoord.xy = vec2(1, 1);',
'} else if(corner == 2.0) {',
' vTextureCoord.xy = vec2(0, 0);',
'} else {',
' vTextureCoord.xy = vec2(1, 0);',
'}',
'vTextureCoord *= tileSize;',
'vTextureCoord.x += tileColumn * tileSize;',
'vTextureCoord.y += tileRow * tileSize;',
'vTextureCoord.z = floor(floor(a_customAttributes / 4.)/u_tilesPerTexture);',
'}'].join('\n'),
tilesPerTexture = 1024, // TODO: Get based on max texture size
atlas,
customPrimitiveType;
var program,
gl,
buffer,
utils,
locations,
nodesCount = 0,
texture,
nodes = new Float32Array(64),
width,
height,
transform,
sizeDirty,
refreshTexture = function (texture, idx) {
if (texture.nativeObject) {
gl.deleteTexture(texture.nativeObject);
}
var nativeObject = gl.createTexture();
gl.activeTexture(gl['TEXTURE' + idx]);
gl.bindTexture(gl.TEXTURE_2D, nativeObject);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, texture.canvas);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_NEAREST);
gl.generateMipmap(gl.TEXTURE_2D);
gl.uniform1i(locations['sampler' + idx], idx);
texture.nativeObject = nativeObject;
},
ensureAtlasTextureUpdated = function () {
if (atlas.isDirty) {
var textures = atlas.getTextures(),
i;
for (i = 0; i < textures.length; ++i) {
if (textures[i].isDirty || !textures[i].nativeObject) {
refreshTexture(textures[i], i);
}
}
atlas.clearDirty();
}
};
return {
load : function (glContext) {
gl = glContext;
utils = Viva.Graph.webgl(glContext);
atlas = new Viva.Graph.View.webglAtlas(tilesPerTexture);
program = utils.createProgram(nodesVS, nodesFS);
gl.useProgram(program);
locations = utils.getLocations(program, ['a_vertexPos', 'a_customAttributes', 'u_screenSize', 'u_transform', 'u_sampler0', 'u_sampler1', 'u_sampler2', 'u_sampler3', 'u_tilesPerTexture']);
gl.uniform1f(locations.tilesPerTexture, tilesPerTexture);
gl.enableVertexAttribArray(locations.vertexPos);
gl.enableVertexAttribArray(locations.customAttributes);
buffer = gl.createBuffer();
},
/**
* Updates position of current node in the buffer of nodes.
*
* @param idx - index of current node.
* @param pos - new position of the node.
*/
position : function (nodeUI, pos) {
var idx = nodeUI.id * ATTRIBUTES_PER_PRIMITIVE;
/*jslint white:true*/
nodes[idx] = pos.x - nodeUI.size; nodes[idx + 1] = pos.y - nodeUI.size; nodes[idx + 2] = nodeUI._offset * 4;
nodes[idx + 3] = pos.x + nodeUI.size; nodes[idx + 4] = pos.y - nodeUI.size; nodes[idx + 5] = nodeUI._offset * 4 + 1;
nodes[idx + 6] = pos.x - nodeUI.size; nodes[idx + 7] = pos.y + nodeUI.size; nodes[idx + 8] = nodeUI._offset * 4 + 2;
nodes[idx + 9] = pos.x - nodeUI.size; nodes[idx + 10] = pos.y + nodeUI.size; nodes[idx + 11] = nodeUI._offset * 4 + 2;
nodes[idx + 12] = pos.x + nodeUI.size; nodes[idx + 13] = pos.y - nodeUI.size; nodes[idx + 14] = nodeUI._offset * 4 + 1;
nodes[idx + 15] = pos.x + nodeUI.size; nodes[idx + 16] = pos.y + nodeUI.size; nodes[idx + 17] = nodeUI._offset * 4 + 3;
},
createNode : function (ui) {
nodes = utils.extendArray(nodes, nodesCount, ATTRIBUTES_PER_PRIMITIVE);
nodesCount += 1;
var coordinates = atlas.getCoordinates(ui.src);
if (coordinates) {
ui._offset = coordinates.offset;
} else {
ui._offset = 0;
// Image is not yet loaded into the atlas. Reload it:
atlas.load(ui.src, function (coordinates) {
ui._offset = coordinates.offset;
});
}
},
removeNode : function (nodeUI) {
if (nodesCount > 0) { nodesCount -= 1; }
if (nodeUI.id < nodesCount && nodesCount > 0) {
if (nodeUI.src) {
atlas.remove(nodeUI.src);
}
utils.copyArrayPart(nodes, nodeUI.id * ATTRIBUTES_PER_PRIMITIVE, nodesCount * ATTRIBUTES_PER_PRIMITIVE, ATTRIBUTES_PER_PRIMITIVE);
}
},
replaceProperties : function (replacedNode, newNode) {
newNode._offset = replacedNode._offset;
},
updateTransform : function (newTransform) {
sizeDirty = true;
transform = newTransform;
},
updateSize : function (w, h) {
width = w;
height = h;
sizeDirty = true;
},
render : function () {
gl.useProgram(program);
gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
gl.bufferData(gl.ARRAY_BUFFER, nodes, gl.DYNAMIC_DRAW);
if (sizeDirty) {
sizeDirty = false;
gl.uniformMatrix4fv(locations.transform, false, transform);
gl.uniform2f(locations.screenSize, width, height);
}
gl.vertexAttribPointer(locations.vertexPos, 2, gl.FLOAT, false, 3 * Float32Array.BYTES_PER_ELEMENT, 0);
gl.vertexAttribPointer(locations.customAttributes, 1, gl.FLOAT, false, 3 * Float32Array.BYTES_PER_ELEMENT, 2 * 4);
ensureAtlasTextureUpdated();
gl.drawArrays(gl.TRIANGLES, 0, nodesCount * 6);
}
};
};
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