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webgp.js
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webgp.js
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// WebGP - a simple library for WEBGL2 computing, visualization, and interactivity
WebGP = function(canvas, context) {
"use strict";
if (typeof document == typeof undefined && !canvas && !context) {
console.log("going headless.... ha ha ha ha....");
canvas = { width: 100, height: 100 };
try { context = require('gl')( canvas.width, canvas.height, { preserveDrawingBuffer: true }) } catch (err) { console.error(err); }
if (!context) {
console.error("Sorry, could not create a GPU context");
return;
}
}
if (!canvas) {
canvas = document.createElement("canvas");
canvas.setAttribute("style","display: block; cursor: default; user-select: none;");
canvas.width = window.innerWidth - 1;
canvas.height = window.innerHeight - 1;
document.body.appendChild(canvas);
}
if (!context) { context = canvas.getContext("webgl2", {antialias: false} );
if (!context) throw "Invalid GL context - browser probably doesn't support WebGL2";
}
const gl = context;
// Extensions needed to render to float array textures
let oes_texture_float_linear = gl.getExtension("OES_texture_float_linear");
if (!oes_texture_float_linear) console.log("No OES_texture_float_linear support - you may have problems with numbers in textures normalizing to 1.0");
let ext_color_buffer_float = gl.getExtension("EXT_color_buffer_float");
if (!ext_color_buffer_float) console.log("No EXT_color_buffer_float support - you may have problems using the framebuffer to capture textures");
let webgl_debug_shaders = gl.getExtension("WEBGL_debug_shaders"); // Turn on capture of translated shader
if (!webgl_debug_shaders) console.log("No WEBGL_debug_shaders support - not a problem - just cannot capture local translation of shader");
class VertexComputer { // A non-abstract representation of a GPU process
constructor(description) {
this.primitiveType = description.type || gl.POINTS; // Default of points makes sense for computation
if (description.vertexArray) { // Use a pre-defined VertexArray object (copies its attributes/structure, shares the buffer)
this.units = description.vertexArray.units;
this.struct = { fields: description.vertexArray.struct.fields, layout: description.vertexArray.struct.layout };
this.struct.byteSize = description.vertexArray.struct.byteSize;
this.vertexBuffers = description.vertexArray.vertexBuffers;
} else {
this.units = description.units; // Or build an array for this computer
this.struct = {
fields: description.struct,
layout: Object.entries(description.struct).map(([field, type], i) => Object.assign({field: field}, Util.glTypes[type]))
};
// Fill up byte-wise layout information
this.bytesSoFar = 0;
this.struct.layout.forEach(field => {field.offset = this.bytesSoFar; this.bytesSoFar += field.bytes; });
this.struct.byteSize = this.bytesSoFar;
}
if (description.divisor) this.divisor = description.divisor; // If this is being used as an instance array
this.uniforms = description.uniforms || {}; // pointer to object containing the values for the uniforms (pulled by name)
if (description.uniformBlock) this.uniformBlock = description.uniformBlock; // pointer to a UniformBuffer object to use for uniforms
if (description.uniformBlocks) this.uniformBlocks = description.uniformBlocks; // array of UniformBuffer object to use for uniforms
// If capturing a texture, setup the capture framebuffer
if (description.textureOut) { // TODO: allow supplying the texture buffers? not sure it's really needed
this.textureOut = description.textureOut; // something truthy (will create buffers) or an array of textures
this.frameBuffer = gl.createFramebuffer();
if (description.textureFeedback) {
this.textureFeedback = description.textureFeedback; // setup configured feedback texture
}
}
if (description.initialize) { // if initialize: Call it for every unit sub-buffer
let markTime = Date.now();
this.initialData = new ArrayBuffer(this.units * this.struct.byteSize);
for (let i = 0; i < this.units; i++) description.initialize(i, new Uint8Array(this.initialData, i * this.struct.byteSize, this.struct.byteSize));
if (Util.logger) Util.logger("initialized "+this.units+" objects in "+(Date.now()-markTime)+" ms");
}
if (description.initializeObject) { // Initialize with objects created by a closure given the index that returns an object with properties for each value
let markTime = Date.now();
this.initialData = new ArrayBuffer(this.units * this.struct.byteSize);
let dataview = new DataView(this.initialData);
for (let i = 0; i < this.units; i++) {
let off = i * this.struct.byteSize; // Offset to the unit data
let newdata = description.initializeObject(i);
this.struct.layout.forEach(f => { f.setFunction(dataview, off + f.offset, newdata[f.field]); });
}
if (Util.logger) Util.logger("initialized "+this.units+" objects in "+(Date.now()-markTime)+" ms");
}
if (description.initializeBuffer) {
if (description.initializeBuffer instanceof ArrayBuffer && description.initializeBuffer.byteLength === this.units * this.struct.byteSize) {
this.initialData = description.initializeBuffer;
} else {
Util.logger("Cannot initialize with buffer instanceof ArrayBuffer "+(description.initializeBuffer instanceof ArrayBuffer ? "yes bytelength="+description.initializeBuffer.byteLength+" bytelength s/b:"+this.units * this.struct.byteSize : "not an ArrayBuffer "));
}
}
if (description.instanceArray) this.instanceArray = description.instanceArray; // Instancing will only apply on rendering but each vertex buffer needs it
if (description.instanceComputer) { // Instancing will only apply on rendering but each vertex buffer needs it
this.instanceArray = description.instanceComputer; // it resembles an instance array enough for this
this.instanceComputer = description.instanceComputer; // step will be called on this at the appropriate time if this is set
this.instanceComputer.divisor = this.instanceComputer.divisor || 1; // default to one if divisor not specified
}
// Setup the double buffers for the vertex arrays
// if no initial data in description, assume buffers will be given later (before the first step if you want it to work)
// attributes for instance arrays must be setup right after the vertex arrays as they will use next attribute locations
if (this.initialData) {
this.vertexBuffers = [Util.buildVertexBuffer(this.struct, this.initialData, this.instanceArray, 0),
Util.buildVertexBuffer(this.struct, this.initialData, this.instanceArray, 1)];
}
if (description.preStep) {
if (description.preStep instanceof Function) {
this.preStep = description.preStep;
} else {
console.error("preStep is not a function, please give a function to call before step");
}
}
if (description.updateStep) { // update step is optional, it will just render
this.updateUniforms = description.updateStep.params;
let uniformBlocks = "";
if (this.uniformBlock) { // TODO: should depracate, can just use the array version
uniformBlocks = "\nlayout(std140) uniform ublock {\n"
+ Util.declarationList("", Util.prefixKeys("u_", this.uniformBlock.struct.fields))
+ "\n}"+(this.uniformBlock.name ? this.uniformBlock.name : "")+";\n";
}
if (this.uniformBlocks) {
uniformBlocks = this.uniformBlocks.map((b,i) =>
"\nlayout(std140) uniform ublocks"+i+" {\n"
+ Util.declarationList("", Util.prefixKeys("u_", b.struct.fields))
+ "\n}"+(b.name ? b.name : "")+";\n").join("\n\n");
}
this.updateShaderCode = description.updateStep.glsl;
let ofields = Util.prefixKeys("o_", this.struct.fields); // so we can add one for texture out if needed
if (this.textureOut) ofields["textureColor"] = "vec4"; // If capturing a texture with textureOut, must have a textureColor output
this.updateShaderCodeVertex = Util.buildShaderCode(gl.VERTEX_SHADER, // Takes in unit struct and output new values for the unit struct
Util.prefixKeys("u_", this.updateUniforms), // uniforms
Util.prefixKeys("i_", this.struct.fields), // inputs
ofields, // outputs
uniformBlocks+this.updateShaderCode // code
);
this.updateShaderCodeFragment = Util.buildShaderCode(gl.FRAGMENT_SHADER, // Default constant fragment shader (has no effect on the feedback transform) - but may output a texture
{}, // uniforms
this.textureOut ? {textureColor: "vec4"} : {}, // inputs
{fragColor: "vec4"}, // outputs
this.textureOut ? `void main() {fragColor=textureColor;}` : `void main() {fragColor=vec4(1.,1.,1.,1.);}` // fragment may not be used because RASTERIZER_DISCARD
);
this.updateShaderVertex = Util.buildShader(gl.VERTEX_SHADER, this.updateShaderCodeVertex);
this.updateShaderFragment = Util.buildShader(gl.FRAGMENT_SHADER, this.updateShaderCodeFragment);
if (webgl_debug_shaders) {
this.updateShaderCodeVertexLines = Util.numberedLines(this.updateShaderCodeVertex);
this.updateShaderCodeFragmentLines = Util.numberedLines(this.updateShaderCodeFragment);
this.updateShaderCodeVertexTranslated = webgl_debug_shaders.getTranslatedShaderSource(this.updateShaderVertex);
this.updateShaderCodeFragmentTranslated = webgl_debug_shaders.getTranslatedShaderSource(this.updateShaderFragment);
}
this.updateProgram = Util.buildProgram(this.updateShaderVertex,this.updateShaderFragment);
if (this.updateProgram) {
Object.keys(this.struct.fields).map((name, i) => gl.bindAttribLocation(this.updateProgram, i, "i_" + name));
if (this.instanceArray) Object.keys(this.instanceArray.struct.fields).map((name, i) => gl.bindAttribLocation(this.renderProgram, this.struct.layout.length+i, name));
gl.transformFeedbackVaryings(this.updateProgram, Object.keys(this.struct.fields).map(name => "o_" + name), gl.INTERLEAVED_ATTRIBS);
gl.linkProgram(this.updateProgram);
if (!gl.getProgramParameter(this.updateProgram, gl.LINK_STATUS)) {
let log = gl.getProgramInfoLog(this.updateProgram);
if (log) {
let error = "Error linking update program " + log;
if (Util.logger) Util.logger(error); else console.error(error);
console.error("Shader code(vertex):\n" + this.updateShaderCodeVertexLines+"\nShader code(fragment):\n" + this.updateShaderCodeFragmentLines);
throw error;
}
}
// Get uniform locations (note, if not used in the code, the uniform location will return null but this seems to be ok)
if (this.updateUniforms) {
this.updateUniformLocations = Object.entries(this.updateUniforms).reduce((o, [k, v]) => (Object.assign(o, {[k]: gl.getUniformLocation(this.updateProgram, "u_" + k)})), {});
}
// If a uniform block is being used, get its index and bind it
if (this.uniformBlock) {
gl.uniformBlockBinding(this.updateProgram, gl.getUniformBlockIndex(this.updateProgram,"ublock"), 0);
}
// If uniform blocks are being used, get its index and bind it
if (this.uniformBlocks) {
this.uniformBlocks.map((b,i) => gl.uniformBlockBinding(this.updateProgram, gl.getUniformBlockIndex(this.updateProgram,"ublocks"+i), i) );
}
this.transformFeedback = gl.createTransformFeedback();
}
}
// Render step is optional, so just update
if (description.renderStep) {
let uniformBlocks = "";
if (this.uniformBlock) {
uniformBlocks = "\nlayout(std140) uniform ublock {\n"
+ Util.declarationList("", Util.prefixKeys("u_", this.uniformBlock.struct.fields))
+ "\n}"+(this.uniformBlock.name ? this.uniformBlock.name : "")+";\n";
}
if (this.uniformBlocks) {
uniformBlocks = this.uniformBlocks.map((b,i) =>
"\nlayout(std140) uniform ublocks"+i+" {\n"
+ Util.declarationList("", Util.prefixKeys("u_", b.struct.fields))
+ "\n}"+(b.name ? b.name : "")+";\n").join("\n\n");
}
this.renderUniforms = description.renderStep.params;
this.renderViewport = description.renderStep.viewport;
this.renderShaderCode = description.renderStep.glsl;
this.renderFragCode = description.renderStep.fragment ? uniformBlocks + description.renderStep.fragment : `void main() { fragColor = vertexColor;}`;
this.renderFragUniforms = description.renderStep.fragmentParams; // || {vertexColor: "vec4"};
this.renderFragIn = description.renderStep.fragmentIn || {vertexColor: "vec4"};
this.renderFragOut = description.renderStep.fragmentOut || {fragColor: "vec4"};
this.renderShaderCodeVertex = Util.buildShaderCode(gl.VERTEX_SHADER, // Takes in unit struct and output new values for the unit struct
Util.prefixKeys("u_", this.renderUniforms), // uniforms
this.instanceArray ? Util.prefixKeys("i_", Object.assign({},this.struct.fields,this.instanceArray.struct.fields)) : Util.prefixKeys("i_", this.struct.fields ), // inputs
this.instanceArray ? Object.assign({},Util.prefixKeys("v_", this.instanceArray.struct.fields),{vertexColor: "vec4"}) : {vertexColor: "vec4"}, // outputs
uniformBlocks+this.renderShaderCode // code
);
this.renderShaderCodeFragment = Util.buildShaderCode(gl.FRAGMENT_SHADER, // Default constant fragment shader (has no effect on the feedback transform) - but may output a texture
Util.prefixKeys("u_", this.renderFragUniforms), // uniforms
this.instanceArray ? Object.assign({},this.renderFragIn,Util.prefixKeys("v_", this.instanceArray.struct.fields)) : this.renderFragIn, // inputs this.renderFragIn,
this.renderFragOut, // outputs
this.renderFragCode // code
);
this.renderShaderVertex = Util.buildShader(gl.VERTEX_SHADER, this.renderShaderCodeVertex);
this.renderShaderFragment = Util.buildShader(gl.FRAGMENT_SHADER, this.renderShaderCodeFragment);
if (webgl_debug_shaders) { // capture translated if we can for troubleshooting down the line
this.renderShaderCodeVertexLines = Util.numberedLines(this.renderShaderCodeVertex);
this.renderShaderCodeFragmentLines = Util.numberedLines(this.renderShaderCodeFragment);
this.renderShaderCodeVertexTranslated = webgl_debug_shaders.getTranslatedShaderSource(this.renderShaderVertex);
this.renderShaderCodeFragmentTranslated = webgl_debug_shaders.getTranslatedShaderSource(this.renderShaderFragment);
}
this.renderProgram = Util.buildProgram(this.renderShaderVertex,this.renderShaderFragment);
if (this.renderProgram) {
Object.keys(this.struct.fields).map((name, i) => gl.bindAttribLocation(this.renderProgram, i, "i_"+name));
if (this.instanceArray) Object.keys(this.instanceArray.struct.fields).map((name, i) => gl.bindAttribLocation(this.renderProgram, this.struct.layout.length+i, "i_"+name) );
gl.linkProgram(this.renderProgram);
if (!gl.getProgramParameter(this.renderProgram, gl.LINK_STATUS)) {
let log = gl.getProgramInfoLog(this.renderProgram);
if (log) {
let error = "Error linking render program " + log;
if (Util.logger) Util.logger(error); else console.error(error);
console.error("Shader code(vertex):\n" + this.renderShaderCodeVertexLines+"\nShader code(fragment):\n" + this.renderShaderCodeFragmentLines);
throw error;
}
}
// Get uniform locations (note, if not used in the code, the uniform location will return null but this seems to be ok)
if (this.renderUniforms) this.renderUniformLocations = Object.entries(this.renderUniforms).reduce((o, [k, v]) => (Object.assign(o, {[k]: gl.getUniformLocation(this.renderProgram, "u_" + k)})), {});
// Get fragment uniform locations (note, if not used in the code, the uniform location will return null but this seems to be ok)
if (this.renderFragUniforms) this.renderFragUniformLocations = Object.entries(this.renderFragUniforms).reduce((o, [k, v]) => (Object.assign(o, {[k]: gl.getUniformLocation(this.renderProgram, "u_" + k)})), {});
// If a uniform block is being used, get its index and bind it
if (this.uniformBlock) gl.uniformBlockBinding(this.renderProgram, gl.getUniformBlockIndex(this.renderProgram, "ublock"), 0);
if (this.uniformBlocks) this.uniformBlocks.map((b, i) => gl.uniformBlockBinding(this.renderProgram, gl.getUniformBlockIndex(this.renderProgram, "ublocks" + i), i));
}
}
if (this.textureOut) { // Setup the output textures for double buffering,
this.textureWidth = description.textureWidth || Util.data2d(this.units);
this.textureHeight = description.textureHeight || this.textureWidth;
if (this.textureOut instanceof Array) {
if (Util.logger) Util.logger("using output texture of "+this.textureWidth+" x "+this.textureHeight);
this.textureBuffers = this.textureOut;
} else {
if (Util.logger) Util.logger("creating output texture of "+this.textureWidth+" x "+this.textureHeight);
this.textureBuffers = [Util.buildTextureOut(this.textureWidth, this.textureHeight), Util.buildTextureOut(this.textureWidth, this.textureHeight)];
}
this.lastTextureOut = this.textureBuffers[1];
if (this.textureFeedback) this.uniforms[this.textureFeedback] = this.lastTextureOut; // update the uniforms for the feedbackTexture
}
this.iteration = 0;
}
update(source, destination, textureBuffers) { // Run the update step using transform feedback
gl.useProgram(this.updateProgram);
if (this.uniformBlock) gl.bindBufferBase(gl.UNIFORM_BUFFER, 0, this.uniformBlock.buffer);
if (this.uniformBlocks) this.uniformBlocks.map((b,i) => gl.bindBufferBase(gl.UNIFORM_BUFFER, i, this.uniformBlocks[i].buffer) );
if (this.updateUniformLocations) { let tc = 0; Object.entries(this.updateUniforms).forEach(([k, v]) => (tc = this.setUniform(tc, k, v, this.updateUniformLocations[k], this.uniforms[k]))); }
if (this.textureOut) { // capture the output texture or discard the pixels
gl.viewport(0, 0,this.textureWidth, this.textureHeight);
gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, this.frameBuffer);
this.lastTextureOut = textureBuffers[this.iteration % 2];
gl.framebufferTexture2D(gl.DRAW_FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, this.lastTextureOut, 0);
} else {
gl.enable(gl.RASTERIZER_DISCARD);
}
gl.bindVertexArray(source.vertexArray); // Bind source and destination buffers
gl.bindBuffer(gl.ARRAY_BUFFER, source.vertexBuffer);
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, this.transformFeedback);
gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, destination.vertexBuffer);
gl.beginTransformFeedback(this.primitiveType);
gl.drawArrays(this.primitiveType, 0, this.units); // do the stuff
gl.endTransformFeedback();
if (this.textureOut) {
gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, null);
gl.viewport(0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight);
if (this.textureFeedback) this.uniforms[this.textureFeedback] = this.lastTextureOut; // update the uniforms for the feedbackTexture
} else {
gl.disable(gl.RASTERIZER_DISCARD);
}
gl.useProgram(null); // Restore context and cleanup
if (this.uniformBlock || this.uniformBlocks) gl.bindBuffer(gl.UNIFORM_BUFFER, null);
gl.bindBuffer(gl.ARRAY_BUFFER, null);
gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, null);
gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK, null);
gl.bindVertexArray(null);
}
render(source) { // Run the render step
if (this.renderViewport) gl.viewport(this.renderViewport.x, this.renderViewport.y, this.renderViewport.width, this.renderViewport.height);
gl.useProgram(this.renderProgram);
if (this.uniformBlock) gl.bindBufferBase(gl.UNIFORM_BUFFER, 0, this.uniformBlock.buffer);
if (this.uniformBlocks) this.uniformBlocks.map((b,i) => gl.bindBufferBase(gl.UNIFORM_BUFFER, i, this.uniformBlocks[i].buffer) );
gl.bindVertexArray(source.vertexArray);
gl.bindBuffer(gl.ARRAY_BUFFER, source.vertexBuffer);
gl.enable(gl.BLEND);
gl.blendFunc(gl.SRC_ALPHA, gl.ONE);
if (this.renderUniformLocations) { let tc = 0; Object.entries(this.renderUniforms).forEach(([k, v]) => (tc = this.setUniform(tc, k, v, this.renderUniformLocations[k], this.uniforms[k]))); }
if (this.renderFragUniformLocations) { let tc = 0; Object.entries(this.renderFragUniforms).forEach(([k, v]) => (tc = this.setUniform(tc, k, v, this.renderFragUniformLocations[k], this.uniforms[k]))); }
if (source.instanceBuffer) { // Render multiple instances of each unit
gl.bindBuffer(gl.ARRAY_BUFFER, source.instanceBuffer);
gl.drawArraysInstanced(this.primitiveType, 0, this.units, this.instanceArray.units);
} else {
gl.drawArrays(this.primitiveType, 0, this.units); // Render each unit once
}
gl.useProgram(null);
if (this.uniformBlock || this.uniformBlocks) gl.bindBuffer(gl.UNIFORM_BUFFER, null);
gl.disable(gl.BLEND);
gl.bindBuffer(gl.ARRAY_BUFFER, null);
gl.bindVertexArray(null);
if (this.renderViewport) gl.viewport(0, 0, canvas.width, canvas.height);
}
setUniform(tc, name, type, loc, val) { // tc = texture count - will increment for each texture
if (val === undefined) { let error = "can't set uniform "+name+" of type " + type + " with value " + val; Util.logger(error); console.error(new Error(error)); }
switch (Util.glTypes[type].constant) { // Getting the gl constant avoids a bunch of string compares
// Texture is first as it is mostly what this is for - you should use uniformBuffers for all other data as they are much faster
case gl.TEXTURE_2D:
if (this.textureBuffers && val === this.textureBuffers[this.iteration % 2]) { // override from alternate buffer if this is a texture we will be writing to
console.error("warning: texture buffer flipped to avoid trying to read and write from same texture - you should look into this (check iterations)");
val = this.textureBuffers[(this.iteration - 1) % 2]; // avoid setting up to read from a texture we are about to write to because the iterations may have incremented in other steps without texture rewrite
}
gl.activeTexture(gl.TEXTURE0 + tc);
gl.bindTexture(gl.TEXTURE_2D, val);
gl.uniform1i(loc, tc);
tc++;
break;
case gl.FLOAT: gl.uniform1f(loc, val); break; // Value types are assumed to match, a vec3 value should be a Float32Array[3] TODO: add more types here
case gl.FLOAT_VEC2: gl.uniform2fv(loc, val); break;
case gl.FLOAT_VEC3: gl.uniform3fv(loc, val); break;
case gl.FLOAT_VEC4: gl.uniform4fv(loc, val); break;
case gl.INT: gl.uniform1i(loc, val); break;
case gl.UINT: gl.uniform1ui(loc, val); break;
default:
let error = "can't set uniform type " + type + " with value " + val;
if (Util.logger) Util.logger(error); else console.error(error);
throw error;
}
return tc;
}
run() { // run in loop forever
Util.clear();
this.step();
Util.GPControls(this.run.bind(this));
}
step(render = true) { // run a single step - Use each buffer alternatively on each step (send iteration to coordinate shared buffers)
if (!this.vertexBuffers) {
let error = new Error("sorry, no buffers, no step - please initialize the buffers on creation (giving array of two buffers or initialization function) or call setBuffers(array of 2 vertex buffer objects)");
if (Util.logger) Util.logger(error); console.error(error); // will give us a stack trace
}
if (this.iteration % 2 === 0) {
if (this.updateProgram) this.update(this.vertexBuffers[0], this.vertexBuffers[1], this.textureBuffers);
if (this.instanceComputer) this.instanceComputer.step();
if (render && this.renderProgram) this.render(this.vertexBuffers[1]);
} else {
if (this.updateProgram) this.update(this.vertexBuffers[1], this.vertexBuffers[0], this.textureBuffers);
if (this.instanceComputer) this.instanceComputer.step();
if (render && this.renderProgram) this.render(this.vertexBuffers[0]);
}
this.iteration++;
}
getResultBuffer() { // return the buffer from the last iteration (iteration was incremented after step)
return this.vertexBuffers[this.iteration % 2];
}
getNextBuffer() { // return the buffer the will be used as the source for the next iteration
return this.vertexBuffers[(this.iteration + 1) % 2];
}
getBuffers() { // return an array of the buffers
return this.vertexBuffers;
}
setBuffers(objArray) { // set the next buffer to use
this.vertexBuffers = objArray;
}
getResultTexture() { // return the output texture from the last iteration
return this.lastTextureOut;
}
getTextureData() { // Return the textureOut pixel values
if (this.textureOut) {
let pixels = new Float32Array(this.textureWidth * this.textureWidth * 4); // to hold the pixels
gl.bindFramebuffer(gl.FRAMEBUFFER, this.frameBuffer);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, this.lastTextureOut, 0);
if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) === gl.FRAMEBUFFER_COMPLETE) {
gl.readPixels(0, 0, this.textureWidth, this.textureWidth, gl.RGBA, gl.FLOAT, pixels);
} else {
log("problem reading pixels, framebuffer not ready");
}
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
return pixels;
} else {
log("Sorry, can only get pixels when doing textureOut");
return undefined;
}
}
getResultDataView() { // Get the entire result in a data view
let vb = this.getResultBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vb.vertexBuffer);
gl.getBufferSubData(gl.ARRAY_BUFFER, 0, new Uint8Array(vb.data));
gl.bindBuffer(gl.ARRAY_BUFFER, null);
return new DataView(vb.data);
}
getResultUnitDataView(index) { // Copy a unit from the result buffer to a dataview
let vb = this.getResultBuffer();
let a = new ArrayBuffer(this.struct.byteSize);
gl.bindBuffer(gl.ARRAY_BUFFER, vb.vertexBuffer);
gl.getBufferSubData(gl.ARRAY_BUFFER, index * this.struct.byteSize, new Uint8Array(a));
gl.bindBuffer(gl.ARRAY_BUFFER, null);
return new DataView(a);
}
getResultUnit(index) { // Copy the unit from the result buffer into an object
return this.getUnit(this.getResultUnitDataView(index),0);
}
getResultUnits() { // gets all the units as an array of objects
let out = [];
let dv = this.getResultDataView(); // Only want to do this once if getting multiple units
for (let i = 0; i < this.units; i++) {
out.push(this.getUnit(dv, i));
}
return out;
}
getUnit(dataview, index) { // Get a unit as an object
let off = index * this.struct.byteSize;
return this.struct.layout.reduce((o, f) => (Object.assign(o, {[f.field]: f.getFunction(dataview,off+f.offset)})), {});
}
// Update a set of values for a unit (does not need to update all of them)
updateUnit(index, newdata) { // newdata is an object with the properties to be updated
// Get the last result unit data into a buffer
let cunit = this.getResultUnitDataView(index);
// set the specified values
this.struct.layout.map(f => { if (newdata.hasOwnProperty(f.field)) { f.setFunction(cunit, f.offset, newdata[f.field]); } });
// write the unit to the next buffer
let off = index * this.struct.byteSize; // Offset to the unit data
gl.bindBuffer(gl.ARRAY_BUFFER, this.getResultBuffer().vertexBuffer);
gl.bufferSubData(gl.ARRAY_BUFFER, off, cunit);
gl.bindBuffer(gl.ARRAY_BUFFER, null);
}
copyUnitToBlock(unit,block) { // Populate a uniform block with a unit
//console.log("copying "+this.struct.byteSize+" into "+block.struct.byteSize);
if (this.struct.byteSize > block.struct.byteSize) {
console.log("too big to fit "+this.struct.byteSize+" into "+block.struct.byteSize);
} else {
gl.bindBuffer(gl.ARRAY_BUFFER, this.getResultBuffer().vertexBuffer);
gl.bindBuffer(gl.UNIFORM_BUFFER, block.buffer);
gl.copyBufferSubData(gl.ARRAY_BUFFER,gl.UNIFORM_BUFFER,unit*this.struct.byteSize,0,this.struct.byteSize);
gl.bindBuffer(gl.ARRAY_BUFFER, null);
gl.bindBuffer(gl.UNIFORM_BUFFER, null);
}
}
destroy() {
gl.deleteTransformFeedback(this.transformFeedback);
gl.deleteProgram(this.updateProgram);
gl.deleteProgram(this.renderProgram);
gl.deleteBuffer(this.vertexBuffers[0].vertexBuffer);
gl.deleteBuffer(this.vertexBuffers[1].vertexBuffer);
if (this.textureOut) {
gl.deleteTexture(this.frontTexture);
gl.deleteTexture(this.backTexture);
}
gl.deleteVertexArray(this.vertexBuffers[0].vertexArray);
gl.deleteVertexArray(this.vertexBuffers[1].vertexArray);
}
}
// Object to wrap just the VertexArray buffers so we can share them amongst computers (must share iteration variable)
// NOTE: not sure this is working well, should probably avoid - seems to get confused when textureout is also involved
class VertexArray {
constructor(description) {
this.units = description.units;
this.struct = {
fields: description.struct,
layout: Object.entries(description.struct).map(([field, type], i) => Object.assign({field: field}, Util.glTypes[type])),
};
this.bytesSoFar = 0; // Fill up byte-wise layout information
this.struct.layout.forEach(field => { field.offset = this.bytesSoFar; this.bytesSoFar += field.bytes; });
this.struct.byteSize = this.bytesSoFar;
if (description.initialize) { // if initialize: Call it for every unit sub-buffer
let markTime = Date.now();
this.initialData = new ArrayBuffer(this.units * this.struct.byteSize);
for (let i = 0; i < this.units; i++) description.initialize(i, new Uint8Array(this.initialData, i * this.struct.byteSize, this.struct.byteSize));
if (Util.logger) Util.logger("initialized "+this.units+" unit buffers in "+(Date.now()-markTime)+" ms");
}
if (description.initializeObject) { // or initialize based on objects returned by a closure given the index
let markTime = Date.now();
this.initialData = new ArrayBuffer(this.units * this.struct.byteSize);
let dataview = new DataView(this.initialData);
for (let i = 0; i < this.units; i++) {
let off = i * this.struct.byteSize; // Offset to the unit data
let newdata = description.initializeObject(i);
this.struct.layout.forEach(f => { f.setFunction(dataview, off + f.offset, newdata[f.field]); });
}
if (Util.logger) Util.logger("initialized "+this.units+" unit objects in "+(Date.now()-markTime)+" ms");
}
if (description.initializeBuffer) {
if (description.initializeBuffer instanceof ArrayBuffer && description.initializeBuffer.byteLength === this.units * this.struct.byteSize) {
this.initialData = description.initializeBuffer;
} else {
Util.logger("Cannot initialize with buffer instanceof ArrayBuffer "+(description.initializeBuffer instanceof ArrayBuffer ? "yes bytelength="+description.initializeBuffer.byteLength+" bytelength s/b:"+this.units * this.struct.byteSize : "not an ArrayBuffer "));
}
}
if (this.initialData) { // Set up the vertex buffers
this.vertexBuffers = [Util.buildVertexBuffer(this.struct, this.initialData), Util.buildVertexBuffer(this.struct, this.initialData)];
}
}
}
// Object to wrap instance data for instanced drawing
class InstanceArray {
constructor(description) {
this.units = description.units;
this.divisor = description.divisor || 1;
this.struct = {
fields: description.struct,
layout: Object.entries(description.struct).map(([field, type], i) => Object.assign({field: field}, Util.glTypes[type])),
};
this.bytesSoFar = 0; // Fill up byte-wise layout information
this.struct.layout.forEach(field => { field.offset = this.bytesSoFar; this.bytesSoFar += field.bytes; });
this.struct.byteSize = this.bytesSoFar;
if (description.initialize) { // if initialize: Call it for every unit sub-buffer
let markTime = Date.now();
this.initialData = new ArrayBuffer(this.units * this.struct.byteSize);
for (let i = 0; i < this.units; i++) description.initialize(i, new Uint8Array(this.initialData, i * this.struct.byteSize, this.struct.byteSize));
if (Util.logger) Util.logger("initialized "+this.units+" unit buffers in "+(Date.now()-markTime)+" ms");
}
// or initialize based on objects returned by a closure given the index
if (description.initializeObject) {
let markTime = Date.now();
this.initialData = new ArrayBuffer(this.units * this.struct.byteSize);
let dataview = new DataView(this.initialData);
for (let i = 0; i < this.units; i++) {
let off = i * this.struct.byteSize; // Offset to the unit data
let newdata = description.initializeObject(i);
this.struct.layout.forEach(f => { f.setFunction(dataview, off + f.offset, newdata[f.field]); });
}
if (Util.logger) Util.logger("initialized "+this.units+" unit objects in "+(Date.now()-markTime)+" ms");
}
if (description.initializeBuffer) {
if (description.initializeBuffer instanceof ArrayBuffer && description.initializeBuffer.byteLength === this.units * this.struct.byteSize) {
this.initialData = description.initializeBuffer;
} else {
Util.logger("Cannot initialize with buffer instanceof ArrayBuffer "+(description.initializeBuffer instanceof ArrayBuffer ? "yes bytelength="+description.initializeBuffer.byteLength+" bytelength s/b:"+this.units * this.struct.byteSize : "not an ArrayBuffer "));
}
}
}
}
// Object to wrap a uniform buffer so we can maintain its data and share them amongst computers
// Be wary of byte packing,
class UniformBlock {
constructor(description) {
// If name is defined, then shader references to the uniforms must be prefixed by it as in name.x
if (description.name) this.name = description.name;
this.struct = {
fields: description.struct,
layout: Object.entries(description.struct).map(([field, type], i) => Object.assign({field: field}, Util.glTypes[type]))
};
this.bytesSoFar = 0; // Fill up byte-wise layout information
this.struct.layout.forEach(field => { field.offset = this.bytesSoFar; this.bytesSoFar += field.bytes; });
this.struct.byteSize = this.bytesSoFar + (16 % this.bytesSoFar); // Size must be divisible by 16 so pad it
this.struct.layout.forEach(o => { if (!o.literal) console.log("UniformBlock error initializing: "+o.field+" as type "+this.struct.fields[o.field]+" was not mapped to a glType"); } ); // check field types
//console.log("size="+this.struct.byteSize+" soFar="+this.bytesSoFar);
if (description.initialize) { // or initialize based on objects returned by a closure given the index
this.data = new ArrayBuffer(this.struct.byteSize);
this.dataview = new DataView(this.data);
this.struct.layout.forEach(f => { f.setFunction(this.dataview, f.offset, description.initialize[f.field]); });
} else {
this.data = new ArrayBuffer(this.struct.byteSize);
this.dataview = new DataView(this.data);
}
if (this.data) { // Set up the buffer
this.buffer = gl.createBuffer();
gl.bindBuffer(gl.UNIFORM_BUFFER, this.buffer);
gl.bufferData(gl.UNIFORM_BUFFER, this.data, gl.STREAM_READ);
gl.bindBuffer(gl.UNIFORM_BUFFER, null);
}
// Update one or more values in the buffer (does not need to update all of them and the buffer is not written to the GPU)
this.set = function(newdata) { // newdata is an object with the properties to be updated
this.struct.layout.map(f => { if (newdata.hasOwnProperty(f.field)) { f.setFunction(this.dataview, f.offset, newdata[f.field]); } });
return this;
};
this.setWrite = function(newdata) { // Updates each property and write only its data in the buffer
gl.bindBuffer(gl.UNIFORM_BUFFER, this.buffer);
this.struct.layout.map(f => { // useful if your buffer is really big and you only want to update a single value
if (newdata.hasOwnProperty(f.field)) {
f.setFunction(this.dataview, f.offset, newdata[f.field]);
gl.bufferSubData(gl.UNIFORM_BUFFER, f.offset, this.dataview, f.offset, f.bytes);
}
});
gl.bindBuffer(gl.UNIFORM_BUFFER, null);
return this;
};
this.write = function() { // write all the buffer data to the uniform buffer in the GPU
gl.bindBuffer(gl.UNIFORM_BUFFER, this.buffer);
gl.bufferSubData(gl.UNIFORM_BUFFER, 0, this.data);
gl.bindBuffer(gl.UNIFORM_BUFFER, null);
};
}
}
// Some helper functions to help manage different data types inside dataviews
function getLittleEndian() {
let buffer = new ArrayBuffer(2);
new DataView(buffer).setInt16(0, 256, true /* littleEndian */);
return new Int16Array(buffer)[0] === 256; // Int16Array uses the platform's endianness.
}
const littleEndian = getLittleEndian(); // Only need to call this once and yes, it actually matters
// handy functions to get data from a dataview
function getIntField(dataview, foffset) {
return dataview.getInt32(foffset, littleEndian);
}
function getIVec2Field(dataview, foffset) {
return [dataview.getInt32(foffset, littleEndian)
, dataview.getInt32(foffset + 4, littleEndian)];
}
function getIVec3Field(dataview, foffset) {
return [dataview.getInt32(foffset, littleEndian)
, dataview.getInt32(foffset + 4, littleEndian)
, dataview.getInt32(foffset + 8, littleEndian)];
}
function getIVec4Field(dataview, foffset) {
return [dataview.getInt32(foffset, littleEndian)
, dataview.getInt32(foffset + 4, littleEndian)
, dataview.getInt32(foffset + 8, littleEndian)
, dataview.getInt32(foffset + 12,littleEndian)];
}
function getFloatField(dataview, foffset) {
return dataview.getFloat32(foffset, littleEndian);
}
function getVec2Field(dataview, foffset) {
return [dataview.getFloat32(foffset, littleEndian)
, dataview.getFloat32(foffset + 4, littleEndian)];
}
function getVec3Field(dataview, foffset) {
return [dataview.getFloat32(foffset, littleEndian)
, dataview.getFloat32(foffset + 4, littleEndian)
, dataview.getFloat32(foffset + 8, littleEndian)];
}
function getVec4Field(dataview, foffset) {
return [dataview.getFloat32(foffset, littleEndian)
, dataview.getFloat32(foffset + 4, littleEndian)
, dataview.getFloat32(foffset + 8, littleEndian)
, dataview.getFloat32(foffset + 12,littleEndian)];
}
function getMat4Field(dataview, foffset) {
return [dataview.getFloat32(foffset, littleEndian)
,dataview.getFloat32(foffset + 4, littleEndian)
,dataview.getFloat32(foffset + 8, littleEndian)
,dataview.getFloat32(foffset + 12,littleEndian)
,dataview.getFloat32(foffset + 16, littleEndian)
,dataview.getFloat32(foffset + 20, littleEndian)
,dataview.getFloat32(foffset + 24, littleEndian)
,dataview.getFloat32(foffset + 28,littleEndian)
,dataview.getFloat32(foffset + 32, littleEndian)
,dataview.getFloat32(foffset + 36, littleEndian)
,dataview.getFloat32(foffset + 40, littleEndian)
,dataview.getFloat32(foffset + 44,littleEndian)
,dataview.getFloat32(foffset + 48, littleEndian)
,dataview.getFloat32(foffset + 52, littleEndian)
,dataview.getFloat32(foffset + 56, littleEndian)
,dataview.getFloat32(foffset + 60,littleEndian)];
}
function getBoolField(dataview, foffset) {
return dataview.getUint8(foffset);
}
function getBVec2Field(dataview, foffset) {
return [dataview.getUint8(foffset)
, dataview.getUint8(foffset + 1)];
}
function getBVec3Field(dataview, foffset) {
return [dataview.getUint8(foffset)
, dataview.getUint8(foffset + 1)
, dataview.getUint8(foffset + 2)];
}
function getBVec4Field(dataview, foffset) {
return [dataview.getUint8(foffset)
, dataview.getUint8(foffset + 1)
, dataview.getUint8(foffset + 2)
, dataview.getUint8(foffset + 3)];
}
// Handy functions to set data in a dataview
function setIntField(dataview, foffset, val) {
dataview.setInt32(foffset, val, littleEndian);
}
function setIVec2Field(dataview, foffset, val) {
dataview.setInt32(foffset, val[0], littleEndian);
dataview.setInt32(foffset + 4, val[1], littleEndian);
}
function setIVec3Field(dataview, foffset, val) {
dataview.setInt32(foffset, val[0], littleEndian);
dataview.setInt32(foffset + 4, val[1], littleEndian);
dataview.setInt32(foffset + 8, val[2], littleEndian);
}
function setIVec4Field(dataview, foffset, val) {
dataview.setInt32(foffset, val[0], littleEndian);
dataview.setInt32(foffset + 4, val[1], littleEndian);
dataview.setInt32(foffset + 8, val[2], littleEndian);
dataview.setInt32(foffset + 12, val[3], littleEndian);
}
function setByteField(dataview, foffset, val) {
dataview.setUint8(foffset, val);
}
function setFloatField(dataview, foffset, val) {
dataview.setFloat32(foffset, val, littleEndian);
}
function setVec2Field(dataview, foffset, val) {
dataview.setFloat32(foffset, val[0], littleEndian);
dataview.setFloat32(foffset + 4, val[1], littleEndian);
}
function setVec3Field(dataview, foffset, val) {
dataview.setFloat32(foffset, val[0], littleEndian);
dataview.setFloat32(foffset + 4, val[1], littleEndian);
dataview.setFloat32(foffset + 8, val[2], littleEndian);
}
function setVec4Field(dataview, foffset, val) {
dataview.setFloat32(foffset, val[0], littleEndian);
dataview.setFloat32(foffset + 4, val[1], littleEndian);
dataview.setFloat32(foffset + 8, val[2], littleEndian);
dataview.setFloat32(foffset + 12, val[3], littleEndian);
}
function setMat4Field(dataview, foffset, val) {
dataview.setFloat32(foffset, val[0], littleEndian);
dataview.setFloat32(foffset + 4, val[1], littleEndian);
dataview.setFloat32(foffset + 8, val[2], littleEndian);
dataview.setFloat32(foffset + 12, val[3], littleEndian);
dataview.setFloat32(foffset + 16, val[4], littleEndian);
dataview.setFloat32(foffset + 20, val[5], littleEndian);
dataview.setFloat32(foffset + 24, val[6], littleEndian);
dataview.setFloat32(foffset + 28, val[7], littleEndian);
dataview.setFloat32(foffset + 32, val[8], littleEndian);
dataview.setFloat32(foffset + 36, val[9], littleEndian);
dataview.setFloat32(foffset + 40, val[10], littleEndian);
dataview.setFloat32(foffset + 44, val[11], littleEndian);
dataview.setFloat32(foffset + 48, val[12], littleEndian);
dataview.setFloat32(foffset + 52, val[13], littleEndian);
dataview.setFloat32(foffset + 56, val[14], littleEndian);
dataview.setFloat32(foffset + 60, val[15], littleEndian);
}
function setBoolField(dataview, foffset, val) {
dataview.setUint8(foffset, val);
}
function setBVec2Field(dataview, foffset, val) {
dataview.setUint8(foffset, val[0]);
dataview.setUint8(foffset + 1, val[1]);
}
function setBVec3Field(dataview, foffset, val) {
dataview.setUint8(foffset, val[0]);
dataview.setUint8(foffset + 1, val[1]);
dataview.setUint8(foffset + 2, val[2]);
}
function setBVec4Field(dataview, foffset, val) {
dataview.setUint8(foffset, val[0]);
dataview.setUint8(foffset + 1, val[1]);
dataview.setUint8(foffset + 2, val[2]);
dataview.setUint8(foffset + 3, val[3]);
}
const Util = {
// Define types used in VertexArrays and Uniforms (Note: not all have been tested, only the float vectors, float, int, and sampler2D have been tested)
glTypes: {
"float": {literal: "float", constant: gl.FLOAT, slotType: gl.FLOAT, slots: 1, bytes: 4, qualifier: "", getFunction: getFloatField, setFunction: setFloatField },
"vec2": {literal: "vec2", constant: gl.FLOAT_VEC2, slotType: gl.FLOAT, slots: 2, bytes: 8, qualifier: "", getFunction: getVec2Field, setFunction: setVec2Field },
"vec3": {literal: "vec3", constant: gl.FLOAT_VEC3, slotType: gl.FLOAT, slots: 3, bytes: 12, qualifier: "", getFunction: getVec3Field, setFunction: setVec3Field },
"vec4": {literal: "vec4", constant: gl.FLOAT_VEC4, slotType: gl.FLOAT, slots: 4, bytes: 16, qualifier: "", getFunction: getVec4Field, setFunction: setVec4Field },
"mat4": {literal: "mat4", constant: gl.FLOAT_MAT4, slotType: gl.FLOAT, slots: 4, bytes: 64, qualifier: "", getFunction: getMat4Field, setFunction: setMat4Field },
"int": {literal: "int", constant: gl.INT, slotType: gl.INT, slots: 1, bytes: 4, qualifier: "flat", getFunction: getIntField, setFunction: setIntField },
"ivec2": {literal: "ivec2", constant: gl.INT_VEC2, slotType: gl.INT, slots: 2, bytes: 8, qualifier: "flat", getFunction: getIVec2Field, setFunction: setIVec2Field },
"ivec3": {literal: "ivec3", constant: gl.INT_VEC3, slotType: gl.INT, slots: 3, bytes: 12, qualifier: "flat", getFunction: getIVec3Field, setFunction: setIVec3Field },
"ivec4": {literal: "ivec4", constant: gl.INT_VEC4, slotType: gl.INT, slots: 4, bytes: 16, qualifier: "flat", getFunction: getIVec4Field, setFunction: setIVec4Field },
"byte": {literal: "byte", constant: gl.BYTE, slotType: gl.BYTE, slots: 1, bytes: 1, qualifier: "", getFunction: getIntField, setFunction: setIntField },
"ubyte": {literal: "ubyte", constant: gl.UNSIGNED_BYTE, slotType: gl.UNSIGNED_BYTE, slots: 1, bytes: 1, qualifier: "", getFunction: getIntField, setFunction: setIntField },
"short": {literal: "short", constant: gl.SHORT, slotType: gl.SHORT, slots: 1, bytes: 2, qualifier: "", getFunction: getIntField, setFunction: setIntField },
"ushort": {literal: "ushort", constant: gl.UNSIGNED_SHORT, slotType: gl.UNSIGNED_SHORT, slots: 1, bytes: 2, qualifier: "", getFunction: getIntField, setFunction: setIntField },
"uint": {literal: "uint", constant: gl.UNSIGNED_INT, slotType: gl.UNSIGNED_INT, slots: 1, bytes: 4, qualifier: "", getFunction: getIntField, setFunction: setIntField },
"bool": {literal: "bool", constant: gl.BOOL, slotType: gl.BOOL, slots: 1, bytes: 4, qualifier: "", getFunction: getBoolField, setFunction: setBoolField },
"sampler2D": {literal: "sampler2D", constant: gl.TEXTURE_2D, slotType: gl.TEXTURE_2D, slots: 1, bytes: 4, qualifier: "", getFunction: getIntField, setFunction: setIntField },
"isampler2D": {literal: "highp isampler2D", constant: gl.TEXTURE_2D, slotType: gl.TEXTURE_2D, slots: 1, bytes: 4, qualifier: "", getFunction: getIntField, setFunction: setIntField },
"usampler2D": {literal: "highp usampler2D", constant: gl.TEXTURE_2D, slotType: gl.TEXTURE_2D, slots: 1, bytes: 4, qualifier: "", getFunction: getIntField, setFunction: setIntField }
},
dataTextureMacros: ` // Handy macros to include in vertex shaders when using data textures
#define TEXTURE_XY(v,w) ivec2(trunc(mod(float(v),float(w))), trunc(float(v) / float(w)))
#define TEXTURE_XY_POS(c,w) vec4((vec2(c)+0.5) / float(w) * 2.0 - 1.0, 1.0, 1.0)
#define TEXTURE_POS(v,w) TEXTURE_XY_POS(TEXTURE_XY(v,w),w)
#define TEXTURE_FETCH(t,v,w) texelFetch(t,TEXTURE_XY(v, w), 0)
`,
cornerVectors: ` // These are used to locate the control points
#define sizerVector vec2(1.0, 1.0)
#define moverTVector vec2(0.5, 1.0)
#define moverRVector vec2(1.0, 0.5)
#define sizeVVector vec2(0.0, 1.0)
#define sizeHVector vec2(1.0, 0.0)
`,
matrixFunctions: `
mat4 frustum(float angle_of_view, float aspect_ratio, float z_near, float z_far) {
return mat4( vec4(1.0/tan(angle_of_view), 0.0, 0.0, 0.0),
vec4(0.0, aspect_ratio/tan(angle_of_view), 0.0, 0.0),
vec4(0.0, 0.0, (z_far+z_near)/(z_far-z_near), 1.0),
vec4(0.0, 0.0, -2.0*z_far*z_near/(z_far-z_near), 0.0) ); }
mat4 scale(float x, float y, float z) { return mat4(vec4(x, 0.0, 0.0, 0.0),
vec4(0.0, y, 0.0, 0.0),
vec4(0.0, 0.0, z, 0.0),
vec4(0.0, 0.0, 0.0, 1.0)); }
mat4 translate(float x, float y, float z) { return mat4(vec4(1.0, 0.0, 0.0, 0.0),
vec4(0.0, 1.0, 0.0, 0.0),
vec4(0.0, 0.0, 1.0, 0.0),
vec4(x, y, z, 1.0)); }
mat4 rotate_x(float theta) { return mat4( vec4(1.0, 0.0, 0.0, 0.0),
vec4(0.0, cos(theta), sin(theta), 0.0),
vec4(0.0, -sin(theta), cos(theta), 0.0),
vec4(0.0, 0.0, 0.0, 1.0)); }
mat4 rotate_y(float theta) { return mat4( vec4(cos(theta), 0.0, sin(theta), 0.0),
vec4(0.0, 1.0, 0.0, 0.0),
vec4(-sin(theta), 0.0, cos(theta), 0.0),
vec4(0.0, 0.0, 0.0, 1.0)); }
mat4 rotate_z(float theta) { return mat4( vec4(cos(theta), -sin(theta), 0.0, 0.0),
vec4(sin(theta), cos(theta), 0.0, 0.0),
vec4(0.0, 0.0, 1.0, 0.0),
vec4(0.0, 0.0, 0.0, 1.0)); }
mat4 projection(vec4 viewport) {
return //frustum(radians(45.0), u_resolution.x/u_resolution.y, 0.5, 5.0) * // no frustum needed (yet?)
translate(viewport.x + viewport.z/2.0, viewport.y + viewport.w/2.0, 0.0) *
scale(viewport.z/2.0, viewport.w/2.0, 1.0); }
`,
clear() { gl.clear(gl.COLOR_BUFFER_BIT); }, // Clear the display
flush() { gl.flush(); },
data2d(units) { // calculates the size of a side of a 2d square to hold the units in a texture
return Math.round(Math.sqrt(units)) + 1;
},
quadPoints: new Float32Array([-1,-1,1,-1,-1,1,-1,1,1,-1,1,1]).buffer, // common buffer of 6 points describing 2 triangles
quadBuffer() { return Util.quadPoints },
createDataTexture(internalFormat, format, type, width, height, data) {
const texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);
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);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.texImage2D(gl.TEXTURE_2D, 0, internalFormat, width, height, 0, format, type, data);
return texture;
},
// Create textures to hold work data
buildTextureOut(width, height, data) { return Util.build4FloatTexture(width, height, data); }, // Texture out is always a 4 float rgba
buildFloatTexture(width, height, data) { return Util.build4FloatTexture(width, height, data); },
build4FloatTexture(width, height, data) { return Util.createDataTexture(gl.RGBA32F, gl.RGBA, gl.FLOAT, width, height, data); },
build4IntTexture(width, height, data) { return Util.createDataTexture(gl.RGBA32I, gl.RGBA, gl.INT, width, height, data); },
build4uIntTexture(width, height, data) { return Util.createDataTexture(gl.RGBA32UI, gl.RGBA, gl.UNSIGNED_INT, width, height, data); },
build1IntTexture(width, height, data) { return Util.createDataTexture(gl.R32I, gl.RED_INTEGER, gl.INT, width, height, data); },
build1uIntTexture(width, height, data) { return Util.createDataTexture(gl.R32UI, gl.RED_INTEGER, gl.UNSIGNED_INT, width, height, data); },
build4ByteTexture(width, height, data) { return Util.createDataTexture(gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, width, height, data); },
build1ShortTexture(width, height, data) { return Util.createDataTexture(gl.R16I, gl.RED_INTEGER, gl.SHORT, width, height, data); },
build1uShortTexture(width, height, data) { return Util.createDataTexture(gl.R16UI, gl.RED_INTEGER, gl.UNSIGNED_SHORT, width, height, data); },
build1ByteTexture(width, height, data) { return Util.createDataTexture(gl.R8I, gl.RED_INTEGER, gl.BYTE, width, height, data); },
build1uByteTexture(width, height, data) { return Util.createDataTexture(gl.R8UI, gl.RED_INTEGER, gl.UNSIGNED_BYTE, width, height, data); },
deleteTexture(tex) { gl.deleteTexture(tex); },
buildImageTexture(image) { // Create a texture to hold an image
const texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, image);
return texture;
},
buildAudioTexture(audioContext, url) { // Create a texture to hold audio (uses bincount to determine size)
let texture = gl.createTexture();
let analyser = audioContext.createAnalyser()
let binCount = analyser.frequencyBinCount;
//console.log("binCount="+binCount);
let freqData = new Uint8Array(binCount);
let waveData = new Uint8Array(binCount);
gl.bindTexture(gl.TEXTURE_2D, texture);
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);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.R8, binCount, 2, 0, gl.RED, gl.UNSIGNED_BYTE, null);
return { url: url, binCount: binCount, texture: texture, analyser: analyser, freqData: freqData, waveData: waveData,
update() {
gl.bindTexture(gl.TEXTURE_2D, this.texture);
this.analyser.getByteFrequencyData(this.freqData);
gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 0, this.binCount, 1, gl.RED, gl.UNSIGNED_BYTE, this.freqData);
this.analyser.getByteTimeDomainData(this.waveData);
gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 1, this.binCount, 1, gl.RED, gl.UNSIGNED_BYTE, this.waveData);
gl.bindTexture(gl.TEXTURE_2D, null);
}
};
},
buildVertexBuffer(struct, bufferData, instanceArray, bindex) {
if (!bufferData) { console.error("call to build vertex buffer with no initial data"); return; }
const vertexArray = gl.createVertexArray(); // Create a new VAO (access wrapper) and a new VBO (actual memory region)
const vertexBuffer = gl.createBuffer();
gl.bindVertexArray(vertexArray); // Associate the VBO with the VAO and fill it with the initial data
gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);
gl.bufferData(gl.ARRAY_BUFFER, bufferData, gl.DYNAMIC_READ);
let loc = 0; // Set the VAO to the same bytewise layout as the struct
struct.layout.map((field, i) => {
gl.enableVertexAttribArray(loc);
if (field.literal === "mat4") {
gl.vertexAttribPointer(loc++, field.slots, field.slotType, false, struct.byteSize, field.offset);
gl.enableVertexAttribArray(loc);
gl.vertexAttribPointer(loc++, field.slots, field.slotType, false, struct.byteSize, field.offset + 16);
gl.enableVertexAttribArray(loc);
gl.vertexAttribPointer(loc++, field.slots, field.slotType, false, struct.byteSize, field.offset + 32);
gl.enableVertexAttribArray(loc);
gl.vertexAttribPointer(loc++, field.slots, field.slotType, false, struct.byteSize, field.offset + 48);
} else if (field.slotType === gl.INT) {
gl.vertexAttribIPointer(loc++, field.slots, field.slotType, struct.byteSize, field.offset);
} else {
gl.vertexAttribPointer(loc++, field.slots, field.slotType, false, struct.byteSize, field.offset);
}
});
// loc is passed to instanceArray to bind the instance attributes
return {vertexArray: vertexArray, vertexBuffer: vertexBuffer, instanceBuffer: Util.buildInstanceBuffer(loc,instanceArray,bindex), data: bufferData};
},
buildInstanceBuffer(startLoc, instanceArray, bindex) {
if (!instanceArray) return; // no instanceArray needed
let inbuf;
if (instanceArray instanceof VertexComputer) {
inbuf = instanceArray.vertexBuffers[bindex].vertexBuffer;
gl.bindBuffer(gl.ARRAY_BUFFER, inbuf);
} else {
if (!instanceArray.initialData) { console.error("call to build instance buffer with no initial data"); return; }
const instanceBuffer = gl.createBuffer();
inbuf = instanceBuffer;
gl.bindBuffer(gl.ARRAY_BUFFER, inbuf);
gl.bufferData(gl.ARRAY_BUFFER, instanceArray.initialData, gl.DYNAMIC_READ);
}
// Set the vertex attributes and instance divisor using the same bytewise layout as the struct
let loc = startLoc;
//let loc = 0;
instanceArray.struct.layout.map((field, i) => {
gl.enableVertexAttribArray(loc);
if (field.literal === "mat4") {
gl.vertexAttribPointer(loc++, field.slots, field.slotType, false, instanceArray.struct.byteSize, field.offset);
gl.enableVertexAttribArray(loc);
gl.vertexAttribPointer(loc++, field.slots, field.slotType, false, instanceArray.struct.byteSize, field.offset + 16);
gl.enableVertexAttribArray(loc);
gl.vertexAttribPointer(loc++, field.slots, field.slotType, false, instanceArray.struct.byteSize, field.offset + 32);
gl.enableVertexAttribArray(loc);
gl.vertexAttribPointer(loc++, field.slots, field.slotType, false, instanceArray.struct.byteSize, field.offset + 48);
} else if (field.slotType === gl.INT) {
gl.vertexAttribIPointer(loc++, field.slots, field.slotType, instanceArray.struct.byteSize, field.offset);
} else {
gl.vertexAttribPointer(loc++, field.slots, field.slotType, false, instanceArray.struct.byteSize, field.offset);
}
gl.vertexAttribDivisor(loc-1,instanceArray.divisor); // minus 1 because loc was incremented after use
});
return inbuf;
},
copyBufferToBuffer(buffera,bufferb) { // Populate a uniform block with a unit
gl.bindBuffer(gl.COPY_READ_BUFFER, buffera);
let basize = gl.getBufferParameter(gl.COPY_READ_BUFFER,gl.BUFFER_SIZE);
gl.bindBuffer(gl.COPY_WRITE_BUFFER, bufferb);
let bbsize = gl.getBufferParameter(gl.COPY_WRITE_BUFFER,gl.BUFFER_SIZE);
//console.log("copy bufa="+basize+" to bufb="+bbsize);
gl.copyBufferSubData(gl.COPY_READ_BUFFER,gl.COPY_WRITE_BUFFER,0,0,bbsize<basize?bbsize:basize);
gl.bindBuffer(gl.COPY_READ_BUFFER, null);
gl.bindBuffer(gl.COPY_WRITE_BUFFER, null);
},
// Generate a list of customizable GLSL declaration from a Javascript map with qualifier option (to support integers in the vertex attribute array)
declarationList: (scope, map, qual) => Object.entries(map || {}).map(([name, type]) => `${qual ? Util.glTypes[type].qualifier : ""} ${scope} ${Util.glTypes[type].literal} ${name};`).join("\n"),
prefixKeys(prefix, map) { // Prefix all keys of an object with a given string
if (map === undefined) return {};
const prefixedMap = {};
Object.keys(map).map(key => prefixedMap[prefix + key] = map[key] );
return prefixedMap;
},
buildShaderCode(type, uniforms, inputs, outputs, code) { // build a standard WebGP GLSL program
return `#version 300 es
precision highp float;
precision highp int;
${Util.declarationList("uniform", uniforms)}
${Util.declarationList("in", inputs, type === gl.FRAGMENT_SHADER ? true : false)}
${Util.declarationList("out", outputs, type === gl.VERTEX_SHADER ? true : false)}
${code}`; },
buildShader(type, source) {
const shader = gl.createShader(type);
gl.shaderSource(shader, source);
gl.compileShader(shader);
// Check for errors
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
let log = gl.getShaderInfoLog(shader);
if (log.length > 0) {
let error = "buildShader error: \n"+(type === gl.VERTEX_SHADER ? "Vertex" : type === gl.FRAGMENT_SHADER ? "Fragment" : "???") + " shader.COMPILE_STATUS Error="+log;
if (Util.logger) Util.logger(error); else console.error(error);