Util完成

src/render/common.ts

@@ -31,3 +31,9 @@ export enum EGLTexWrapType {
     GL_MIRRORED_REPEAT,
     GL_CLAMP_TO_EDGE
 }
+
+export enum EPlaneLoc {
+    FRONT,         // 在平面的正面
+    BACK,          // 在平面的背面
+    COPLANAR       // 与平面共面
+}

src/render/core/Primitives.ts

@@ -0,0 +1,128 @@
+import { vec2, vec3, vec4, mat4 } from "../math";
+import { GLAttribBits, GLAttribState } from "../webgl/WebGLAttribState";
+import { GLStaticMesh } from "../webgl/WebGLMesh";
+
+export class GeometryData {
+
+    /**
+     * @var 点的位置
+     */
+    public positions: vec3[] = [];
+
+    /**
+     * @var uv坐标
+     */
+    public uvs: vec2[] = [];
+
+    /**
+     * @var 法线坐标
+     */
+    public normals: vec3[] = [];
+
+    /**
+     * @var 颜色坐标
+     */
+    public colors: vec4[] = [];
+
+    /**
+     * @var 切线坐标
+     */
+    public tangents: vec4[] = [];
+
+    /**
+     * @var 索引
+     */
+    public indices: number[] = [];
+
+    /**
+     * 生成一个attrib bit
+     * @returns 
+     */
+    public getAttribBits(): GLAttribBits {
+
+        if (this.positions.length === 0) {
+            throw new Error("position data is required");
+        }
+
+        let ret: GLAttribBits = GLAttribState.POSITION_BIT;
+
+        if (this.uvs.length > 0) {
+            ret |= GLAttribState.TEXCOORD_BIT;
+        }
+
+        if (this.normals.length > 0) {
+            ret |= GLAttribState.NORMAL_BIT;
+        }
+
+        if (this.colors.length > 0) {
+            ret |= GLAttribState.COLOR_BIT;
+        }
+
+        if (this.tangents.length > 0) {
+            ret |= GLAttribState.TANGENT_BIT;
+        }
+
+        return ret;
+    }
+
+    public makeStaticVAO(gl: WebGLRenderingContext, needNormal: boolean = false, needUV: boolean = true): GLStaticMesh {
+
+        let bits: GLAttribBits = this.getAttribBits();
+
+        if (needNormal === false) {
+            bits &= ~GLAttribState.NORMAL_BIT;
+        }
+
+        if (needUV === false) {
+            bits &= ~GLAttribState.TEXCOORD_BIT;
+        }
+
+        let stride: number = GLAttribState.getVertexBytesStride(bits);
+        let step: number = stride / Float32Array.BYTES_PER_ELEMENT;
+        let arrayBuffer: ArrayBuffer = new ArrayBuffer(stride * this.positions.length);
+        let buffer: Float32Array = new Float32Array(arrayBuffer);
+
+        for (let i: number = 0; i < this.positions.length; i++) {
+            let j: number = i * step;
+            let idx: number = 0;
+
+            //位置
+            buffer[j + (idx++)] = this.positions[i].x;
+            buffer[j + (idx++)] = this.positions[i].y;
+            buffer[j + (idx++)] = this.positions[i].z;
+
+            //法线
+            if (bits & GLAttribState.NORMAL_BIT) {
+                buffer[j + (idx++)] = this.normals[i].x;
+                buffer[j + (idx++)] = this.normals[i].y;
+                buffer[j + (idx++)] = this.normals[i].z;
+            }
+
+            //纹理
+            if (bits & GLAttribState.TEXCOORD_BIT) {
+                buffer[j + (idx++)] = this.uvs[i].x;
+                buffer[j + (idx++)] = this.uvs[i].y;
+            }
+
+            //颜色
+            if (bits & GLAttribState.COLOR_BIT) {
+                buffer[j + (idx++)] = this.colors[i].x;
+                buffer[j + (idx++)] = this.colors[i].y;
+                buffer[j + (idx++)] = this.colors[i].z;
+                buffer[j + (idx++)] = this.colors[i].w;
+            }
+
+            //切线
+            if (bits & GLAttribState.TANGENT_BIT) {
+                buffer[j + (idx++)] = this.tangents[i].x;
+                buffer[j + (idx++)] = this.tangents[i].y;
+                buffer[j + (idx++)] = this.tangents[i].z;
+                buffer[j + (idx++)] = this.tangents[i].w;
+            }
+        }
+
+        let mesh: GLStaticMesh = new GLStaticMesh(gl, bits, buffer, this.indices.length > 0 ? new Uint16Array(this.indices) : null);
+
+        return mesh;
+    }
+}

src/render/math/Util.ts

@@ -1,3 +1,7 @@
+import { EPSILON, EPlaneLoc } from "../common";
+import { vec2, vec3, vec4, mat4 } from ".";
+import { quat } from "./Quat";
+
 export class Util {
     /**
        * 判断参数x是否是2的n次方，即x是不是1、2、4、8、16、32、64、.....
@@ -26,4 +30,385 @@ export class Util {
         }
         return x + 1;
     }
+
+    /**
+     * 角度/弧度互转函数
+     * @param degree 
+     * @returns 
+     */
+    public static toRadian(degree: number): number {
+        return degree * Math.PI / 180;
+    }
+
+    /**
+     * 浮点容差相等函数
+     * @param left 
+     * @param right 
+     * @returns 
+     */
+    public static numberEuaqls(left: number, right: number): boolean {
+
+        if (Math.abs(left - right) > EPSILON) {
+            return false;
+        }
+        return true;
+    }
+
+    /**
+     * 
+     * @param x 
+     * @param min 
+     * @param max 
+     * @returns 
+     */
+    public static clamp(x: number, min: number, max: number): number {
+        return (x < min) ? min : (x > max) ? max : x;
+    }
+
+    /**
+     * 
+     * @param localPt 
+     * @param mvp 
+     * @param viewport 
+     * @param viewportPt 
+     * @returns 
+     */
+    public static obj2GLViewportSpace(localPt: vec3, mvp: mat4, viewport: Int32Array | Float32Array, viewportPt: vec3): boolean {
+
+        let v: vec4 = new vec4([localPt.x, localPt.y, localPt.z, 1.0]);
+        //这里相当于 v = mvp * v, 将顶点从local坐标系变换到投影坐标系
+        mvp.multiplyVec4(v, v);
+
+        //如果变换后的w为0，则返回false
+        if (v.w === 0.0) {
+            return false;
+        }
+
+        // 将裁剪坐标系的点的x / y / z分量除以w，得到normalized坐标值[ -1 , 1 ]之间
+        v.x /= v.w;
+        v.y /= v.w;
+        v.z /= v.w;
+
+        // [-1 , 1]标示的点变换到视口坐标系
+        v.x = v.x * 0.5 + 0.5;
+        v.y = v.y * 0.5 + 0.5;
+        v.z = v.z * 0.5 + 0.5;
+
+        // 视口坐标系再变换到屏幕坐标系
+        viewportPt.x = v.x * viewport[2] + viewport[0];
+        viewportPt.y = v.y * viewport[3] + viewport[1];
+        viewportPt.z = v.z;
+
+        return true;
+    }
+
+    /**
+     * 给出3个点，计算法向
+     * @param a 
+     * @param b 
+     * @param c 
+     * @param result 
+     * @returns 
+     */
+    public static computeNormal(a: vec3, b: vec3, c: vec3, result: vec3 | null): vec3 {
+        if (!result) {
+            result = new vec3();
+        }
+
+        let l0: vec3 = new vec3();
+        let l1: vec3 = new vec3();
+
+        vec3.difference(b, a, l0);
+        vec3.difference(c, a, l1);
+        vec3.cross(l0, l1, result);
+        result.normalize();
+
+        return result;
+    }
+
+    /**
+     * 通过3个点，创建一个平面
+     * @param a 
+     * @param b 
+     * @param c 
+     * @param result 
+     * @returns 
+     */
+    public static planeFromPoints(a: vec3, b: vec3, c: vec3, result: vec4 | null = null): vec4 {
+        if (!result) {
+            result = new vec4();
+        }
+
+        let normal: vec3 = new vec3();
+        Util.computeNormal(a, b, c, normal);
+        let d: number = -vec3.dot(normal, a);
+
+        result.x = normal.x;
+        result.y = normal.y;
+        result.z = normal.z;
+        result.w = d;
+
+        return result;
+    }
+
+    /**
+     * 通过平面的一个点和法线创建一个平面
+     * @param p 
+     * @param normal 
+     * @param result 
+     * @returns 
+     */
+    public static planeFromPointNormal(p: vec3, normal: vec3, result: vec4 | null = null): vec4 {
+        if (!result) {
+            result = new vec4();
+        }
+        let d: number = -vec3.dot(normal, p);
+
+        result.x = normal.x;
+        result.y = normal.y;
+        result.z = normal.z;
+        result.w = d;
+
+        return result;
+    }
+
+    /**
+     * 通过多边形创建一个屏幕
+     * @param polygon 
+     * @returns 
+     */
+    public static planeFromPolygon(polygon: vec3[]): vec4 {
+        if (polygon.length < 3) {
+            throw new Error("The number of vertices of polygon must be greater than or equal to 3 ");
+        }
+        return Util.planeFromPoints(polygon[0], polygon[1], polygon[2]);
+    }
+
+    /**
+     * 点到平面距离
+     * @param plane 
+     * @param point 
+     * @returns 
+     */
+    public static planeDistanceFromPoint(plane: vec4, point: vec3): number {
+        return (point.x * plane.x + point.y * plane.y + point.z * plane.z + plane.w);
+    }
+
+    /**
+     * 判断点和平面的关系
+     * @param plane 
+     * @param point 
+     * @returns 
+     */
+    public static planeTestPoint(plane: vec4, point: vec3): EPlaneLoc {
+        let num: number = Util.planeDistanceFromPoint(plane, point);
+        if (num > EPSILON) {
+            return EPlaneLoc.FRONT;
+        } else if (num < - EPSILON) {
+            return EPlaneLoc.BACK;
+        } else {
+            return EPlaneLoc.COPLANAR;
+        }
+    }
+
+    /**
+     * 平面单位化
+     * @param plane 
+     * @returns 
+     */
+    public static planeNormalize(plane: vec4): number {
+        let length: number;
+        length = Math.sqrt(plane.x * plane.x + plane.y * plane.y + plane.z * plane.z);
+        if (length === 0) {
+            throw new Error("The plane area is 0");
+        }
+        plane.x /= length;
+        plane.y /= length;
+        plane.z /= length;
+        plane.w /= length;
+        return length;
+    }
+
+    /**
+     * 获取包围盒
+     * @param v 
+     * @param mins 
+     * @param maxs 
+     */
+    public static boundBoxAddPoint(v: vec3, mins: vec3, maxs: vec3): void {
+
+        if (v.x < mins.x) {
+            mins.x = v.x;
+        }
+        if (v.x > maxs.x) {
+            maxs.x = v.x;
+        }
+
+        if (v.y < mins.y) {
+            mins.y = v.y;
+        }
+        if (v.y > maxs.y) {
+            maxs.y = v.y;
+        }
+
+        if (v.z < mins.z) {
+            mins.z = v.z;
+        }
+        if (v.z > maxs.z) {
+            maxs.z = v.z;
+        }
+    }
+
+    /**
+     * 清除包围盒
+     * @param mins 
+     * @param maxs 
+     * @param value 
+     */
+    public static boundBoxClear(mins: vec3, maxs: vec3, value: number = Infinity): void {
+        mins.x = mins.y = mins.z = value;   // 初始化时，让mins表示浮点数的最大范围
+        maxs.x = maxs.y = maxs.z = -value;  // 初始化是，让maxs表示浮点数的最小范围
+    }
+
+    /**
+     * 获取包围盒的中心点坐标
+     * @param mins 
+     * @param maxs 
+     * @param out 
+     * @returns 
+     */
+    public static boundBoxGetCenter(mins: vec3, maxs: vec3, out: vec3 | null = null): vec3 {
+        if (out === null) {
+            out = new vec3();
+        }
+        //(maxs + mins) * 0.5
+        vec3.sum(mins, maxs, out);
+        out.scale(0.5);
+        return out;
+    }
+
+    /**
+     * 获取包围盒的8个顶点
+     * @param mins 
+     * @param maxs 
+     * @param pts8 
+     *  /3--------/7  |
+     *  / |       /   |
+     *  /  |      /   |
+     *  1---------5   |
+     *  |  /2- - -|- -6
+     *  | /       |  /
+     *  |/        | /
+     * 0---------4/
+     */
+    public static boundBoxGet8Points(mins: vec3, maxs: vec3, pts8: vec3[]): void {
+
+        //获取中心点
+        let center: vec3 = Util.boundBoxGetCenter(mins, maxs);
+
+        //获取最大点到中心点之间的距离向量
+        let maxs2center: vec3 = vec3.difference(center, maxs);
+
+        pts8.push(new vec3([center.x + maxs2center.x, center.y + maxs2center.y, center.z + maxs2center.z]));  // 0
+        pts8.push(new vec3([center.x + maxs2center.x, center.y - maxs2center.y, center.z + maxs2center.z]));  // 1
+        pts8.push(new vec3([center.x + maxs2center.x, center.y + maxs2center.y, center.z - maxs2center.z]));  // 2
+        pts8.push(new vec3([center.x + maxs2center.x, center.y - maxs2center.y, center.z - maxs2center.z]));  // 3
+        pts8.push(new vec3([center.x - maxs2center.x, center.y + maxs2center.y, center.z + maxs2center.z]));  // 4
+        pts8.push(new vec3([center.x - maxs2center.x, center.y - maxs2center.y, center.z + maxs2center.z]));  // 5
+        pts8.push(new vec3([center.x - maxs2center.x, center.y + maxs2center.y, center.z - maxs2center.z]));  // 6
+        pts8.push(new vec3([center.x - maxs2center.x, center.y - maxs2center.y, center.z - maxs2center.z]));  // 7
+    }
+
+    /**
+     * 包围盒坐标变换
+     * @param mat 
+     * @param mins 
+     * @param maxs 
+     */
+    public static boundBoxTransform(mat: mat4, mins: vec3, maxs: vec3): void {
+        // 获得局部坐标系表示的AABB的8个顶点坐标
+        let pts: vec3[] = [];
+        Util.boundBoxGet8Points(mins, maxs, pts);
+
+        //变换后的顶点
+        let out: vec3 = new vec3();
+
+        for (let i: number = 0; i < pts.length; i++) {
+            // 将局部坐标表示的顶点变换到mat坐标空间中去，变换后的结果放在out变量中
+            mat.multiplyVec3(pts[i], out);
+            Util.boundBoxAddPoint(out, mins, maxs);
+        }
+    }
+
+    /**
+     * 判断某个点是否在包围盒内
+     * @param point 
+     * @param mins 
+     * @param maxs 
+     */
+    public static boundBoxContainPoint(point: vec3, mins: vec3, maxs: vec3): boolean {
+        return (point.x >= mins.x && point.x <= maxs.x && point.y >= mins.y && point.y <= maxs.y && point.z >= mins.z && point.z <= maxs.z);
+    }
+
+    /**
+     * 
+     * @param min1 判断包围盒1 是的在包围盒2内
+     * @param max1 
+     * @param min2 
+     * @param max2 
+     * @returns 
+     */
+    public static boundBoxBoundBoxOverlap(min1: vec3, max1: vec3, min2: vec3, max2: vec3): boolean {
+        if (min1.x > max2.x) return false;
+        if (max1.x < min2.x) return false;
+        if (min1.y > max2.y) return false;
+        if (max1.y < min2.y) return false;
+        if (min1.z > max2.z) return false;
+        if (max1.z < min2.z) return false;
+        return true;
+    }
+
+    /**
+     * 交换y轴 和 z轴
+     * @param v 
+     * @param scale 
+     */
+    public static convertVec3IDCoord2GLCoord(v: vec3, scale: number = 10.0): void {
+        let f: number = v.y;
+        v.y = v.z;
+        v.z = -f;
+        if (!Util.numberEuaqls(scale, 0) && !Util.numberEuaqls(scale, 1.0)) {
+            v.x /= scale;
+            v.y /= scale;
+            v.z /= scale;
+        }
+    }
+
+    /**
+     * 
+     * @param v 
+     */
+    public static convertVec2IDCoord2GLCoord(v: vec2): void {
+        v.y = 1.0 - v.y;
+    }
+
+    /**
+     * 
+     * @param pos 
+     * @param q 
+     * @param dest 
+     * @returns 
+     */
+    public static matrixFrom(pos: vec3, q: quat, dest: mat4 | null = null): mat4 {
+        if (dest === null) {
+            dest = new mat4();
+        }
+
+        q.toMat4(dest);
+        dest.values[12] = pos.x;
+        dest.values[13] = pos.y;
+        dest.values[14] = pos.z;
+
+        return dest;
+    }
 }