spine-runtimes/spine-ts/webgl/src/Mesh.ts

/******************************************************************************
 * Spine Runtimes Software License
 * Version 2.5
 * 
 * Copyright (c) 2013-2016, Esoteric Software
 * All rights reserved.
 * 
 * You are granted a perpetual, non-exclusive, non-sublicensable, and
 * non-transferable license to use, install, execute, and perform the Spine
 * Runtimes software and derivative works solely for personal or internal
 * use. Without the written permission of Esoteric Software (see Section 2 of
 * the Spine Software License Agreement), you may not (a) modify, translate,
 * adapt, or develop new applications using the Spine Runtimes or otherwise
 * create derivative works or improvements of the Spine Runtimes or (b) remove,
 * delete, alter, or obscure any trademarks or any copyright, trademark, patent,
 * or other intellectual property or proprietary rights notices on or in the
 * Software, including any copy thereof. Redistributions in binary or source
 * form must include this license and terms.
 * 
 * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL ESOTERIC SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *****************************************************************************/

module spine.webgl {
	export class Mesh implements Disposable {
		private _gl: WebGLRenderingContext;
		private _vertices:Float32Array;
		private _verticesBuffer: WebGLBuffer;
		private _verticesLength = 0;
		private _dirtyVertices = false;
		private _indices:Uint16Array;
		private _indicesBuffer: WebGLBuffer;
		private _indicesLength = 0;
		private _dirtyIndices = false;
		private _elementsPerVertex = 0;

		attributes (): VertexAttribute[] { return this._attributes; }

		maxVertices (): number { return this._vertices.length / this._elementsPerVertex; }
		numVertices (): number { return this._verticesLength / this._elementsPerVertex; }
		setVerticesLength (length: number) {
			this._dirtyVertices = true;
			this._verticesLength = length;
		}
		vertices (): Float32Array { return this._vertices; }

		maxIndices (): number { return this._indices.length; }
		numIndices (): number { return this._indicesLength; }
		setIndicesLength (length: number) {
			this._dirtyIndices = true;
			this._indicesLength = length;
		}
		indices (): Uint16Array { return this._indices };

		constructor (gl: WebGLRenderingContext, private _attributes: VertexAttribute[], maxVertices: number, maxIndices: number) {
			this._gl = gl;
			this._elementsPerVertex = 0;
			for (let i = 0; i < _attributes.length; i++) {
				this._elementsPerVertex += _attributes[i].numElements;
			}
			this._vertices = new Float32Array(maxVertices * this._elementsPerVertex);
			this._indices = new Uint16Array(maxIndices);
		}

		setVertices (vertices: Array<number>) {
			this._dirtyVertices = true;
			if (vertices.length > this._vertices.length) throw Error("Mesh can't store more than " + this.maxVertices() + " vertices");
			this._vertices.set(vertices, 0);
			this._verticesLength = vertices.length;
		}

		setIndices (indices: Array<number>) {
			this._dirtyIndices = true;
			if (indices.length > this._indices.length) throw Error("Mesh can't store more than " + this.maxIndices() + " indices");
			this._indices.set(indices, 0);
			this._indicesLength = indices.length;
		}

		draw (shader: Shader, primitiveType: number) {
			this.drawWithOffset(shader, primitiveType, 0, this._indicesLength > 0? this._indicesLength: this._verticesLength);
		}

		drawWithOffset (shader: Shader, primitiveType: number, offset: number, count: number) {
			let gl = this._gl;
			if (this._dirtyVertices || this._dirtyIndices) this.update();
			this.bind(shader);
			if (this._indicesLength > 0) gl.drawElements(primitiveType, count, gl.UNSIGNED_SHORT, offset * 2);
			else gl.drawArrays(primitiveType, offset, count);
			this.unbind(shader);
		}

		bind (shader: Shader) {
			let gl = this._gl;
			gl.bindBuffer(gl.ARRAY_BUFFER, this._verticesBuffer);
			let offset = 0;
			for (let i = 0; i < this._attributes.length; i++) {
				let attrib = this._attributes[i];
				let location = shader.getAttributeLocation(attrib.name);
				gl.enableVertexAttribArray(location);
				gl.vertexAttribPointer(location, attrib.numElements, gl.FLOAT, false, this._elementsPerVertex * 4, offset * 4);
				offset += attrib.numElements;
			}
			if (this._indicesLength > 0) gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this._indicesBuffer);
		}

		unbind (shader: Shader) {
			let gl = this._gl;
			for (let i = 0; i < this._attributes.length; i++) {
				let attrib = this._attributes[i];
				let location = shader.getAttributeLocation(attrib.name);
				gl.disableVertexAttribArray(location);
			}
			gl.bindBuffer(gl.ARRAY_BUFFER, null);
			if (this._indicesLength > 0) gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, null);
		}

		private update () {
			let gl = this._gl;
			if (this._dirtyVertices) {
				if (!this._verticesBuffer) {
					this._verticesBuffer = gl.createBuffer();
				}
				gl.bindBuffer(gl.ARRAY_BUFFER, this._verticesBuffer);
				gl.bufferData(gl.ARRAY_BUFFER, this._vertices.subarray(0, this._verticesLength), gl.STATIC_DRAW);
				this._dirtyVertices = false;
			}

			if (this._dirtyIndices) {
				if (!this._indicesBuffer) {
					this._indicesBuffer = gl.createBuffer();
				}
				gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this._indicesBuffer);
				gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, this._indices.subarray(0, this._indicesLength), gl.STATIC_DRAW);
				this._dirtyIndices = false;
			}
		}

		dispose () {
			let gl = this._gl;
			gl.deleteBuffer(this._verticesBuffer);
			gl.deleteBuffer(this._indicesBuffer);
		}
	}

	export class VertexAttribute {
		constructor (public name: string, public type: VertexAttributeType, public numElements: number) { }
	}

	export class Position2Attribute extends VertexAttribute {
		constructor () {
			super(Shader.POSITION, VertexAttributeType.Float, 2);
		}
	}

	export class Position3Attribute extends VertexAttribute {
		constructor () {
			super(Shader.POSITION, VertexAttributeType.Float, 3);
		}
	}

	export class TexCoordAttribute extends VertexAttribute {
		constructor (unit: number = 0) {
			super(Shader.TEXCOORDS + (unit == 0? "": unit), VertexAttributeType.Float, 2);
		}
	}

	export class ColorAttribute extends VertexAttribute {
		constructor () {
			super(Shader.COLOR, VertexAttributeType.Float, 4);
		}
	}

	export enum VertexAttributeType {
		Float
	}
}