diff --git a/lab4/lib/cuon-matrix.js b/lab4/lib/cuon-matrix.js
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+++ b/lab4/lib/cuon-matrix.js
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+// cuon-matrix.js (c) 2012 kanda and matsuda
+/**
+ * This is a class treating 4x4 matrix.
+ * This class contains the function that is equivalent to OpenGL matrix stack.
+ * The matrix after conversion is calculated by multiplying a conversion matrix from the right.
+ * The matrix is replaced by the calculated result.
+ */
+
+/**
+ * Constructor of Matrix4
+ * If opt_src is specified, new matrix is initialized by opt_src.
+ * Otherwise, new matrix is initialized by identity matrix.
+ * @param opt_src source matrix(option)
+ */
+var Matrix4 = function(opt_src) {
+ var i, s, d;
+ if (opt_src && typeof opt_src === 'object' && opt_src.hasOwnProperty('elements')) {
+ s = opt_src.elements;
+ d = new Float32Array(16);
+ for (i = 0; i < 16; ++i) {
+ d[i] = s[i];
+ }
+ this.elements = d;
+ } else {
+ this.elements = new Float32Array([1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0,0,1]);
+ }
+};
+
+/**
+ * Set the identity matrix.
+ * @return this
+ */
+Matrix4.prototype.setIdentity = function() {
+ var e = this.elements;
+ e[0] = 1; e[4] = 0; e[8] = 0; e[12] = 0;
+ e[1] = 0; e[5] = 1; e[9] = 0; e[13] = 0;
+ e[2] = 0; e[6] = 0; e[10] = 1; e[14] = 0;
+ e[3] = 0; e[7] = 0; e[11] = 0; e[15] = 1;
+ return this;
+};
+
+/**
+ * Copy matrix.
+ * @param src source matrix
+ * @return this
+ */
+Matrix4.prototype.set = function(src) {
+ var i, s, d;
+
+ s = src.elements;
+ d = this.elements;
+
+ if (s === d) {
+ return;
+ }
+
+ for (i = 0; i < 16; ++i) {
+ d[i] = s[i];
+ }
+
+ return this;
+};
+
+/**
+ * Multiply the matrix from the right.
+ * @param other The multiply matrix
+ * @return this
+ */
+Matrix4.prototype.concat = function(other) {
+ var i, e, a, b, ai0, ai1, ai2, ai3;
+
+ // Calculate e = a * b
+ e = this.elements;
+ a = this.elements;
+ b = other.elements;
+
+ // If e equals b, copy b to temporary matrix.
+ if (e === b) {
+ b = new Float32Array(16);
+ for (i = 0; i < 16; ++i) {
+ b[i] = e[i];
+ }
+ }
+
+ for (i = 0; i < 4; i++) {
+ ai0=a[i]; ai1=a[i+4]; ai2=a[i+8]; ai3=a[i+12];
+ e[i] = ai0 * b[0] + ai1 * b[1] + ai2 * b[2] + ai3 * b[3];
+ e[i+4] = ai0 * b[4] + ai1 * b[5] + ai2 * b[6] + ai3 * b[7];
+ e[i+8] = ai0 * b[8] + ai1 * b[9] + ai2 * b[10] + ai3 * b[11];
+ e[i+12] = ai0 * b[12] + ai1 * b[13] + ai2 * b[14] + ai3 * b[15];
+ }
+
+ return this;
+};
+Matrix4.prototype.multiply = Matrix4.prototype.concat;
+
+/**
+ * Multiply the three-dimensional vector.
+ * @param pos The multiply vector
+ * @return The result of multiplication(Float32Array)
+ */
+Matrix4.prototype.multiplyVector3 = function(pos) {
+ var e = this.elements;
+ var p = pos.elements;
+ var v = new Vector3();
+ var result = v.elements;
+
+ result[0] = p[0] * e[0] + p[1] * e[4] + p[2] * e[ 8] + e[12];
+ result[1] = p[0] * e[1] + p[1] * e[5] + p[2] * e[ 9] + e[13];
+ result[2] = p[0] * e[2] + p[1] * e[6] + p[2] * e[10] + e[14];
+
+ return v;
+};
+
+/**
+ * Multiply the four-dimensional vector.
+ * @param pos The multiply vector
+ * @return The result of multiplication(Float32Array)
+ */
+Matrix4.prototype.multiplyVector4 = function(pos) {
+ var e = this.elements;
+ var p = pos.elements;
+ var v = new Vector4();
+ var result = v.elements;
+
+ result[0] = p[0] * e[0] + p[1] * e[4] + p[2] * e[ 8] + p[3] * e[12];
+ result[1] = p[0] * e[1] + p[1] * e[5] + p[2] * e[ 9] + p[3] * e[13];
+ result[2] = p[0] * e[2] + p[1] * e[6] + p[2] * e[10] + p[3] * e[14];
+ result[3] = p[0] * e[3] + p[1] * e[7] + p[2] * e[11] + p[3] * e[15];
+
+ return v;
+};
+
+/**
+ * Transpose the matrix.
+ * @return this
+ */
+Matrix4.prototype.transpose = function() {
+ var e, t;
+
+ e = this.elements;
+
+ t = e[ 1]; e[ 1] = e[ 4]; e[ 4] = t;
+ t = e[ 2]; e[ 2] = e[ 8]; e[ 8] = t;
+ t = e[ 3]; e[ 3] = e[12]; e[12] = t;
+ t = e[ 6]; e[ 6] = e[ 9]; e[ 9] = t;
+ t = e[ 7]; e[ 7] = e[13]; e[13] = t;
+ t = e[11]; e[11] = e[14]; e[14] = t;
+
+ return this;
+};
+
+/**
+ * Calculate the inverse matrix of specified matrix, and set to this.
+ * @param other The source matrix
+ * @return this
+ */
+Matrix4.prototype.setInverseOf = function(other) {
+ var i, s, d, inv, det;
+
+ s = other.elements;
+ d = this.elements;
+ inv = new Float32Array(16);
+
+ inv[0] = s[5]*s[10]*s[15] - s[5] *s[11]*s[14] - s[9] *s[6]*s[15]
+ + s[9]*s[7] *s[14] + s[13]*s[6] *s[11] - s[13]*s[7]*s[10];
+ inv[4] = - s[4]*s[10]*s[15] + s[4] *s[11]*s[14] + s[8] *s[6]*s[15]
+ - s[8]*s[7] *s[14] - s[12]*s[6] *s[11] + s[12]*s[7]*s[10];
+ inv[8] = s[4]*s[9] *s[15] - s[4] *s[11]*s[13] - s[8] *s[5]*s[15]
+ + s[8]*s[7] *s[13] + s[12]*s[5] *s[11] - s[12]*s[7]*s[9];
+ inv[12] = - s[4]*s[9] *s[14] + s[4] *s[10]*s[13] + s[8] *s[5]*s[14]
+ - s[8]*s[6] *s[13] - s[12]*s[5] *s[10] + s[12]*s[6]*s[9];
+
+ inv[1] = - s[1]*s[10]*s[15] + s[1] *s[11]*s[14] + s[9] *s[2]*s[15]
+ - s[9]*s[3] *s[14] - s[13]*s[2] *s[11] + s[13]*s[3]*s[10];
+ inv[5] = s[0]*s[10]*s[15] - s[0] *s[11]*s[14] - s[8] *s[2]*s[15]
+ + s[8]*s[3] *s[14] + s[12]*s[2] *s[11] - s[12]*s[3]*s[10];
+ inv[9] = - s[0]*s[9] *s[15] + s[0] *s[11]*s[13] + s[8] *s[1]*s[15]
+ - s[8]*s[3] *s[13] - s[12]*s[1] *s[11] + s[12]*s[3]*s[9];
+ inv[13] = s[0]*s[9] *s[14] - s[0] *s[10]*s[13] - s[8] *s[1]*s[14]
+ + s[8]*s[2] *s[13] + s[12]*s[1] *s[10] - s[12]*s[2]*s[9];
+
+ inv[2] = s[1]*s[6]*s[15] - s[1] *s[7]*s[14] - s[5] *s[2]*s[15]
+ + s[5]*s[3]*s[14] + s[13]*s[2]*s[7] - s[13]*s[3]*s[6];
+ inv[6] = - s[0]*s[6]*s[15] + s[0] *s[7]*s[14] + s[4] *s[2]*s[15]
+ - s[4]*s[3]*s[14] - s[12]*s[2]*s[7] + s[12]*s[3]*s[6];
+ inv[10] = s[0]*s[5]*s[15] - s[0] *s[7]*s[13] - s[4] *s[1]*s[15]
+ + s[4]*s[3]*s[13] + s[12]*s[1]*s[7] - s[12]*s[3]*s[5];
+ inv[14] = - s[0]*s[5]*s[14] + s[0] *s[6]*s[13] + s[4] *s[1]*s[14]
+ - s[4]*s[2]*s[13] - s[12]*s[1]*s[6] + s[12]*s[2]*s[5];
+
+ inv[3] = - s[1]*s[6]*s[11] + s[1]*s[7]*s[10] + s[5]*s[2]*s[11]
+ - s[5]*s[3]*s[10] - s[9]*s[2]*s[7] + s[9]*s[3]*s[6];
+ inv[7] = s[0]*s[6]*s[11] - s[0]*s[7]*s[10] - s[4]*s[2]*s[11]
+ + s[4]*s[3]*s[10] + s[8]*s[2]*s[7] - s[8]*s[3]*s[6];
+ inv[11] = - s[0]*s[5]*s[11] + s[0]*s[7]*s[9] + s[4]*s[1]*s[11]
+ - s[4]*s[3]*s[9] - s[8]*s[1]*s[7] + s[8]*s[3]*s[5];
+ inv[15] = s[0]*s[5]*s[10] - s[0]*s[6]*s[9] - s[4]*s[1]*s[10]
+ + s[4]*s[2]*s[9] + s[8]*s[1]*s[6] - s[8]*s[2]*s[5];
+
+ det = s[0]*inv[0] + s[1]*inv[4] + s[2]*inv[8] + s[3]*inv[12];
+ if (det === 0) {
+ return this;
+ }
+
+ det = 1 / det;
+ for (i = 0; i < 16; i++) {
+ d[i] = inv[i] * det;
+ }
+
+ return this;
+};
+
+/**
+ * Calculate the inverse matrix of this, and set to this.
+ * @return this
+ */
+Matrix4.prototype.invert = function() {
+ return this.setInverseOf(this);
+};
+
+/**
+ * Set the orthographic projection matrix.
+ * @param left The coordinate of the left of clipping plane.
+ * @param right The coordinate of the right of clipping plane.
+ * @param bottom The coordinate of the bottom of clipping plane.
+ * @param top The coordinate of the top top clipping plane.
+ * @param near The distances to the nearer depth clipping plane. This value is minus if the plane is to be behind the viewer.
+ * @param far The distances to the farther depth clipping plane. This value is minus if the plane is to be behind the viewer.
+ * @return this
+ */
+Matrix4.prototype.setOrtho = function(left, right, bottom, top, near, far) {
+ var e, rw, rh, rd;
+
+ if (left === right || bottom === top || near === far) {
+ throw 'null frustum';
+ }
+
+ rw = 1 / (right - left);
+ rh = 1 / (top - bottom);
+ rd = 1 / (far - near);
+
+ e = this.elements;
+
+ e[0] = 2 * rw;
+ e[1] = 0;
+ e[2] = 0;
+ e[3] = 0;
+
+ e[4] = 0;
+ e[5] = 2 * rh;
+ e[6] = 0;
+ e[7] = 0;
+
+ e[8] = 0;
+ e[9] = 0;
+ e[10] = -2 * rd;
+ e[11] = 0;
+
+ e[12] = -(right + left) * rw;
+ e[13] = -(top + bottom) * rh;
+ e[14] = -(far + near) * rd;
+ e[15] = 1;
+
+ return this;
+};
+
+/**
+ * Multiply the orthographic projection matrix from the right.
+ * @param left The coordinate of the left of clipping plane.
+ * @param right The coordinate of the right of clipping plane.
+ * @param bottom The coordinate of the bottom of clipping plane.
+ * @param top The coordinate of the top top clipping plane.
+ * @param near The distances to the nearer depth clipping plane. This value is minus if the plane is to be behind the viewer.
+ * @param far The distances to the farther depth clipping plane. This value is minus if the plane is to be behind the viewer.
+ * @return this
+ */
+Matrix4.prototype.ortho = function(left, right, bottom, top, near, far) {
+ return this.concat(new Matrix4().setOrtho(left, right, bottom, top, near, far));
+};
+
+/**
+ * Set the perspective projection matrix.
+ * @param left The coordinate of the left of clipping plane.
+ * @param right The coordinate of the right of clipping plane.
+ * @param bottom The coordinate of the bottom of clipping plane.
+ * @param top The coordinate of the top top clipping plane.
+ * @param near The distances to the nearer depth clipping plane. This value must be plus value.
+ * @param far The distances to the farther depth clipping plane. This value must be plus value.
+ * @return this
+ */
+Matrix4.prototype.setFrustum = function(left, right, bottom, top, near, far) {
+ var e, rw, rh, rd;
+
+ if (left === right || top === bottom || near === far) {
+ throw 'null frustum';
+ }
+ if (near <= 0) {
+ throw 'near <= 0';
+ }
+ if (far <= 0) {
+ throw 'far <= 0';
+ }
+
+ rw = 1 / (right - left);
+ rh = 1 / (top - bottom);
+ rd = 1 / (far - near);
+
+ e = this.elements;
+
+ e[ 0] = 2 * near * rw;
+ e[ 1] = 0;
+ e[ 2] = 0;
+ e[ 3] = 0;
+
+ e[ 4] = 0;
+ e[ 5] = 2 * near * rh;
+ e[ 6] = 0;
+ e[ 7] = 0;
+
+ e[ 8] = (right + left) * rw;
+ e[ 9] = (top + bottom) * rh;
+ e[10] = -(far + near) * rd;
+ e[11] = -1;
+
+ e[12] = 0;
+ e[13] = 0;
+ e[14] = -2 * near * far * rd;
+ e[15] = 0;
+
+ return this;
+};
+
+/**
+ * Multiply the perspective projection matrix from the right.
+ * @param left The coordinate of the left of clipping plane.
+ * @param right The coordinate of the right of clipping plane.
+ * @param bottom The coordinate of the bottom of clipping plane.
+ * @param top The coordinate of the top top clipping plane.
+ * @param near The distances to the nearer depth clipping plane. This value must be plus value.
+ * @param far The distances to the farther depth clipping plane. This value must be plus value.
+ * @return this
+ */
+Matrix4.prototype.frustum = function(left, right, bottom, top, near, far) {
+ return this.concat(new Matrix4().setFrustum(left, right, bottom, top, near, far));
+};
+
+/**
+ * Set the perspective projection matrix by fovy and aspect.
+ * @param fovy The angle between the upper and lower sides of the frustum.
+ * @param aspect The aspect ratio of the frustum. (width/height)
+ * @param near The distances to the nearer depth clipping plane. This value must be plus value.
+ * @param far The distances to the farther depth clipping plane. This value must be plus value.
+ * @return this
+ */
+Matrix4.prototype.setPerspective = function(fovy, aspect, near, far) {
+ var e, rd, s, ct;
+
+ if (near === far || aspect === 0) {
+ throw 'null frustum';
+ }
+ if (near <= 0) {
+ throw 'near <= 0';
+ }
+ if (far <= 0) {
+ throw 'far <= 0';
+ }
+
+ fovy = Math.PI * fovy / 180 / 2;
+ s = Math.sin(fovy);
+ if (s === 0) {
+ throw 'null frustum';
+ }
+
+ rd = 1 / (far - near);
+ ct = Math.cos(fovy) / s;
+
+ e = this.elements;
+
+ e[0] = ct / aspect;
+ e[1] = 0;
+ e[2] = 0;
+ e[3] = 0;
+
+ e[4] = 0;
+ e[5] = ct;
+ e[6] = 0;
+ e[7] = 0;
+
+ e[8] = 0;
+ e[9] = 0;
+ e[10] = -(far + near) * rd;
+ e[11] = -1;
+
+ e[12] = 0;
+ e[13] = 0;
+ e[14] = -2 * near * far * rd;
+ e[15] = 0;
+
+ return this;
+};
+
+/**
+ * Multiply the perspective projection matrix from the right.
+ * @param fovy The angle between the upper and lower sides of the frustum.
+ * @param aspect The aspect ratio of the frustum. (width/height)
+ * @param near The distances to the nearer depth clipping plane. This value must be plus value.
+ * @param far The distances to the farther depth clipping plane. This value must be plus value.
+ * @return this
+ */
+Matrix4.prototype.perspective = function(fovy, aspect, near, far) {
+ return this.concat(new Matrix4().setPerspective(fovy, aspect, near, far));
+};
+
+/**
+ * Set the matrix for scaling.
+ * @param x The scale factor along the X axis
+ * @param y The scale factor along the Y axis
+ * @param z The scale factor along the Z axis
+ * @return this
+ */
+Matrix4.prototype.setScale = function(x, y, z) {
+ var e = this.elements;
+ e[0] = x; e[4] = 0; e[8] = 0; e[12] = 0;
+ e[1] = 0; e[5] = y; e[9] = 0; e[13] = 0;
+ e[2] = 0; e[6] = 0; e[10] = z; e[14] = 0;
+ e[3] = 0; e[7] = 0; e[11] = 0; e[15] = 1;
+ return this;
+};
+
+/**
+ * Multiply the matrix for scaling from the right.
+ * @param x The scale factor along the X axis
+ * @param y The scale factor along the Y axis
+ * @param z The scale factor along the Z axis
+ * @return this
+ */
+Matrix4.prototype.scale = function(x, y, z) {
+ var e = this.elements;
+ e[0] *= x; e[4] *= y; e[8] *= z;
+ e[1] *= x; e[5] *= y; e[9] *= z;
+ e[2] *= x; e[6] *= y; e[10] *= z;
+ e[3] *= x; e[7] *= y; e[11] *= z;
+ return this;
+};
+
+/**
+ * Set the matrix for translation.
+ * @param x The X value of a translation.
+ * @param y The Y value of a translation.
+ * @param z The Z value of a translation.
+ * @return this
+ */
+Matrix4.prototype.setTranslate = function(x, y, z) {
+ var e = this.elements;
+ e[0] = 1; e[4] = 0; e[8] = 0; e[12] = x;
+ e[1] = 0; e[5] = 1; e[9] = 0; e[13] = y;
+ e[2] = 0; e[6] = 0; e[10] = 1; e[14] = z;
+ e[3] = 0; e[7] = 0; e[11] = 0; e[15] = 1;
+ return this;
+};
+
+/**
+ * Multiply the matrix for translation from the right.
+ * @param x The X value of a translation.
+ * @param y The Y value of a translation.
+ * @param z The Z value of a translation.
+ * @return this
+ */
+Matrix4.prototype.translate = function(x, y, z) {
+ var e = this.elements;
+ e[12] += e[0] * x + e[4] * y + e[8] * z;
+ e[13] += e[1] * x + e[5] * y + e[9] * z;
+ e[14] += e[2] * x + e[6] * y + e[10] * z;
+ e[15] += e[3] * x + e[7] * y + e[11] * z;
+ return this;
+};
+
+/**
+ * Set the matrix for rotation.
+ * The vector of rotation axis may not be normalized.
+ * @param angle The angle of rotation (degrees)
+ * @param x The X coordinate of vector of rotation axis.
+ * @param y The Y coordinate of vector of rotation axis.
+ * @param z The Z coordinate of vector of rotation axis.
+ * @return this
+ */
+Matrix4.prototype.setRotate = function(angle, x, y, z) {
+ var e, s, c, len, rlen, nc, xy, yz, zx, xs, ys, zs;
+
+ angle = Math.PI * angle / 180;
+ e = this.elements;
+
+ s = Math.sin(angle);
+ c = Math.cos(angle);
+
+ if (0 !== x && 0 === y && 0 === z) {
+ // Rotation around X axis
+ if (x < 0) {
+ s = -s;
+ }
+ e[0] = 1; e[4] = 0; e[ 8] = 0; e[12] = 0;
+ e[1] = 0; e[5] = c; e[ 9] =-s; e[13] = 0;
+ e[2] = 0; e[6] = s; e[10] = c; e[14] = 0;
+ e[3] = 0; e[7] = 0; e[11] = 0; e[15] = 1;
+ } else if (0 === x && 0 !== y && 0 === z) {
+ // Rotation around Y axis
+ if (y < 0) {
+ s = -s;
+ }
+ e[0] = c; e[4] = 0; e[ 8] = s; e[12] = 0;
+ e[1] = 0; e[5] = 1; e[ 9] = 0; e[13] = 0;
+ e[2] =-s; e[6] = 0; e[10] = c; e[14] = 0;
+ e[3] = 0; e[7] = 0; e[11] = 0; e[15] = 1;
+ } else if (0 === x && 0 === y && 0 !== z) {
+ // Rotation around Z axis
+ if (z < 0) {
+ s = -s;
+ }
+ e[0] = c; e[4] =-s; e[ 8] = 0; e[12] = 0;
+ e[1] = s; e[5] = c; e[ 9] = 0; e[13] = 0;
+ e[2] = 0; e[6] = 0; e[10] = 1; e[14] = 0;
+ e[3] = 0; e[7] = 0; e[11] = 0; e[15] = 1;
+ } else {
+ // Rotation around another axis
+ len = Math.sqrt(x*x + y*y + z*z);
+ if (len !== 1) {
+ rlen = 1 / len;
+ x *= rlen;
+ y *= rlen;
+ z *= rlen;
+ }
+ nc = 1 - c;
+ xy = x * y;
+ yz = y * z;
+ zx = z * x;
+ xs = x * s;
+ ys = y * s;
+ zs = z * s;
+
+ e[ 0] = x*x*nc + c;
+ e[ 1] = xy *nc + zs;
+ e[ 2] = zx *nc - ys;
+ e[ 3] = 0;
+
+ e[ 4] = xy *nc - zs;
+ e[ 5] = y*y*nc + c;
+ e[ 6] = yz *nc + xs;
+ e[ 7] = 0;
+
+ e[ 8] = zx *nc + ys;
+ e[ 9] = yz *nc - xs;
+ e[10] = z*z*nc + c;
+ e[11] = 0;
+
+ e[12] = 0;
+ e[13] = 0;
+ e[14] = 0;
+ e[15] = 1;
+ }
+
+ return this;
+};
+
+/**
+ * Multiply the matrix for rotation from the right.
+ * The vector of rotation axis may not be normalized.
+ * @param angle The angle of rotation (degrees)
+ * @param x The X coordinate of vector of rotation axis.
+ * @param y The Y coordinate of vector of rotation axis.
+ * @param z The Z coordinate of vector of rotation axis.
+ * @return this
+ */
+Matrix4.prototype.rotate = function(angle, x, y, z) {
+ return this.concat(new Matrix4().setRotate(angle, x, y, z));
+};
+
+/**
+ * Set the viewing matrix.
+ * @param eyeX, eyeY, eyeZ The position of the eye point.
+ * @param centerX, centerY, centerZ The position of the reference point.
+ * @param upX, upY, upZ The direction of the up vector.
+ * @return this
+ */
+Matrix4.prototype.setLookAt = function(eyeX, eyeY, eyeZ, centerX, centerY, centerZ, upX, upY, upZ) {
+ var e, fx, fy, fz, rlf, sx, sy, sz, rls, ux, uy, uz;
+
+ fx = centerX - eyeX;
+ fy = centerY - eyeY;
+ fz = centerZ - eyeZ;
+
+ // Normalize f.
+ rlf = 1 / Math.sqrt(fx*fx + fy*fy + fz*fz);
+ fx *= rlf;
+ fy *= rlf;
+ fz *= rlf;
+
+ // Calculate cross product of f and up.
+ sx = fy * upZ - fz * upY;
+ sy = fz * upX - fx * upZ;
+ sz = fx * upY - fy * upX;
+
+ // Normalize s.
+ rls = 1 / Math.sqrt(sx*sx + sy*sy + sz*sz);
+ sx *= rls;
+ sy *= rls;
+ sz *= rls;
+
+ // Calculate cross product of s and f.
+ ux = sy * fz - sz * fy;
+ uy = sz * fx - sx * fz;
+ uz = sx * fy - sy * fx;
+
+ // Set to this.
+ e = this.elements;
+ e[0] = sx;
+ e[1] = ux;
+ e[2] = -fx;
+ e[3] = 0;
+
+ e[4] = sy;
+ e[5] = uy;
+ e[6] = -fy;
+ e[7] = 0;
+
+ e[8] = sz;
+ e[9] = uz;
+ e[10] = -fz;
+ e[11] = 0;
+
+ e[12] = 0;
+ e[13] = 0;
+ e[14] = 0;
+ e[15] = 1;
+
+ // Translate.
+ return this.translate(-eyeX, -eyeY, -eyeZ);
+};
+
+/**
+ * Multiply the viewing matrix from the right.
+ * @param eyeX, eyeY, eyeZ The position of the eye point.
+ * @param centerX, centerY, centerZ The position of the reference point.
+ * @param upX, upY, upZ The direction of the up vector.
+ * @return this
+ */
+Matrix4.prototype.lookAt = function(eyeX, eyeY, eyeZ, centerX, centerY, centerZ, upX, upY, upZ) {
+ return this.concat(new Matrix4().setLookAt(eyeX, eyeY, eyeZ, centerX, centerY, centerZ, upX, upY, upZ));
+};
+
+/**
+ * Multiply the matrix for project vertex to plane from the right.
+ * @param plane The array[A, B, C, D] of the equation of plane "Ax + By + Cz + D = 0".
+ * @param light The array which stored coordinates of the light. if light[3]=0, treated as parallel light.
+ * @return this
+ */
+Matrix4.prototype.dropShadow = function(plane, light) {
+ var mat = new Matrix4();
+ var e = mat.elements;
+
+ var dot = plane[0] * light[0] + plane[1] * light[1] + plane[2] * light[2] + plane[3] * light[3];
+
+ e[ 0] = dot - light[0] * plane[0];
+ e[ 1] = - light[1] * plane[0];
+ e[ 2] = - light[2] * plane[0];
+ e[ 3] = - light[3] * plane[0];
+
+ e[ 4] = - light[0] * plane[1];
+ e[ 5] = dot - light[1] * plane[1];
+ e[ 6] = - light[2] * plane[1];
+ e[ 7] = - light[3] * plane[1];
+
+ e[ 8] = - light[0] * plane[2];
+ e[ 9] = - light[1] * plane[2];
+ e[10] = dot - light[2] * plane[2];
+ e[11] = - light[3] * plane[2];
+
+ e[12] = - light[0] * plane[3];
+ e[13] = - light[1] * plane[3];
+ e[14] = - light[2] * plane[3];
+ e[15] = dot - light[3] * plane[3];
+
+ return this.concat(mat);
+}
+
+/**
+ * Multiply the matrix for project vertex to plane from the right.(Projected by parallel light.)
+ * @param normX, normY, normZ The normal vector of the plane.(Not necessary to be normalized.)
+ * @param planeX, planeY, planeZ The coordinate of arbitrary points on a plane.
+ * @param lightX, lightY, lightZ The vector of the direction of light.(Not necessary to be normalized.)
+ * @return this
+ */
+Matrix4.prototype.dropShadowDirectionally = function(normX, normY, normZ, planeX, planeY, planeZ, lightX, lightY, lightZ) {
+ var a = planeX * normX + planeY * normY + planeZ * normZ;
+ return this.dropShadow([normX, normY, normZ, -a], [lightX, lightY, lightZ, 0]);
+};
+
+/**
+ * Constructor of Vector3
+ * If opt_src is specified, new vector is initialized by opt_src.
+ * @param opt_src source vector(option)
+ */
+var Vector3 = function(opt_src) {
+ var v = new Float32Array(3);
+ if (opt_src && typeof opt_src === 'object') {
+ v[0] = opt_src[0]; v[1] = opt_src[1]; v[2] = opt_src[2];
+ }
+ this.elements = v;
+}
+
+/**
+ * Normalize.
+ * @return this
+ */
+Vector3.prototype.normalize = function() {
+ var v = this.elements;
+ var c = v[0], d = v[1], e = v[2], g = Math.sqrt(c*c+d*d+e*e);
+ if(g){
+ if(g == 1)
+ return this;
+ } else {
+ v[0] = 0; v[1] = 0; v[2] = 0;
+ return this;
+ }
+ g = 1/g;
+ v[0] = c*g; v[1] = d*g; v[2] = e*g;
+ return this;
+};
+
+/**
+ * Constructor of Vector4
+ * If opt_src is specified, new vector is initialized by opt_src.
+ * @param opt_src source vector(option)
+ */
+var Vector4 = function(opt_src) {
+ var v = new Float32Array(4);
+ if (opt_src && typeof opt_src === 'object') {
+ v[0] = opt_src[0]; v[1] = opt_src[1]; v[2] = opt_src[2]; v[3] = opt_src[3];
+ }
+ this.elements = v;
+}
\ No newline at end of file
diff --git a/lab4/lib/webgl-debug.1.js b/lab4/lib/webgl-debug.1.js
new file mode 100644
index 0000000000000000000000000000000000000000..685868dc61347ea10c0376520f1e20ed57a765c7
--- /dev/null
+++ b/lab4/lib/webgl-debug.1.js
@@ -0,0 +1,677 @@
+//Copyright (c) 2009 The Chromium Authors. All rights reserved.
+//Use of this source code is governed by a BSD-style license that can be
+//found in the LICENSE file.
+
+// Various functions for helping debug WebglInstance apps.
+
+WebGLDebugUtils = function() {
+
+/**
+ * Wrapped logging function.
+ * @param {string} msg Message to log.
+ */
+var log = function(msg) {
+ if (window.console && window.console.log) {
+ window.console.log(msg);
+ }
+};
+
+/**
+ * Which arguements are enums.
+ * @type {!Object.<number, string>}
+ */
+var glValidEnumContexts = {
+
+ // Generic setters and getters
+
+ 'enable': { 0:true },
+ 'disable': { 0:true },
+ 'getParameter': { 0:true },
+
+ // Rendering
+
+ 'drawArrays': { 0:true },
+ 'drawElements': { 0:true, 2:true },
+
+ // Shaders
+
+ 'createShader': { 0:true },
+ 'getShaderParameter': { 1:true },
+ 'getProgramParameter': { 1:true },
+
+ // Vertex attributes
+
+ 'getVertexAttrib': { 1:true },
+ 'vertexAttribPointer': { 2:true },
+
+ // Textures
+
+ 'bindTexture': { 0:true },
+ 'activeTexture': { 0:true },
+ 'getTexParameter': { 0:true, 1:true },
+ 'texParameterf': { 0:true, 1:true },
+ 'texParameteri': { 0:true, 1:true, 2:true },
+ 'texImage2D': { 0:true, 2:true, 6:true, 7:true },
+ 'texSubImage2D': { 0:true, 6:true, 7:true },
+ 'copyTexImage2D': { 0:true, 2:true },
+ 'copyTexSubImage2D': { 0:true },
+ 'generateMipmap': { 0:true },
+
+ // Buffer objects
+
+ 'bindBuffer': { 0:true },
+ 'bufferData': { 0:true, 2:true },
+ 'bufferSubData': { 0:true },
+ 'getBufferParameter': { 0:true, 1:true },
+
+ // Renderbuffers and framebuffers
+
+ 'pixelStorei': { 0:true, 1:true },
+ 'readPixels': { 4:true, 5:true },
+ 'bindRenderbuffer': { 0:true },
+ 'bindFramebuffer': { 0:true },
+ 'checkFramebufferStatus': { 0:true },
+ 'framebufferRenderbuffer': { 0:true, 1:true, 2:true },
+ 'framebufferTexture2D': { 0:true, 1:true, 2:true },
+ 'getFramebufferAttachmentParameter': { 0:true, 1:true, 2:true },
+ 'getRenderbufferParameter': { 0:true, 1:true },
+ 'renderbufferStorage': { 0:true, 1:true },
+
+ // Frame buffer operations (clear, blend, depth test, stencil)
+
+ 'clear': { 0:true },
+ 'depthFunc': { 0:true },
+ 'blendFunc': { 0:true, 1:true },
+ 'blendFuncSeparate': { 0:true, 1:true, 2:true, 3:true },
+ 'blendEquation': { 0:true },
+ 'blendEquationSeparate': { 0:true, 1:true },
+ 'stencilFunc': { 0:true },
+ 'stencilFuncSeparate': { 0:true, 1:true },
+ 'stencilMaskSeparate': { 0:true },
+ 'stencilOp': { 0:true, 1:true, 2:true },
+ 'stencilOpSeparate': { 0:true, 1:true, 2:true, 3:true },
+
+ // Culling
+
+ 'cullFace': { 0:true },
+ 'frontFace': { 0:true },
+};
+
+/**
+ * Map of numbers to names.
+ * @type {Object}
+ */
+var glEnums = null;
+
+/**
+ * Initializes this module. Safe to call more than once.
+ * @param {!WebGLRenderingContext} ctx A WebglInstance context. If
+ * you have more than one context it doesn't matter which one
+ * you pass in, it is only used to pull out constants.
+ */
+function init(ctx) {
+ if (glEnums == null) {
+ glEnums = { };
+ for (var propertyName in ctx) {
+ if (typeof ctx[propertyName] == 'number') {
+ glEnums[ctx[propertyName]] = propertyName;
+ }
+ }
+ }
+}
+
+/**
+ * Checks the utils have been initialized.
+ */
+function checkInit() {
+ if (glEnums == null) {
+ throw 'WebGLDebugUtils.init(ctx) not called';
+ }
+}
+
+/**
+ * Returns true or false if value matches any WebglInstance enum
+ * @param {*} value Value to check if it might be an enum.
+ * @return {boolean} True if value matches one of the WebglInstance defined enums
+ */
+function mightBeEnum(value) {
+ checkInit();
+ return (glEnums[value] !== undefined);
+}
+
+/**
+ * Gets an string version of an WebglInstance enum.
+ *
+ * Example:
+ * var str = WebGLDebugUtil.glEnumToString(ctx.getError());
+ *
+ * @param {number} value Value to return an enum for
+ * @return {string} The string version of the enum.
+ */
+function glEnumToString(value) {
+ checkInit();
+ var name = glEnums[value];
+ return (name !== undefined) ? name :
+ ("*UNKNOWN WebglInstance ENUM (0x" + value.toString(16) + ")");
+}
+
+/**
+ * Returns the string version of a WebglInstance argument.
+ * Attempts to convert enum arguments to strings.
+ * @param {string} functionName the name of the WebglInstance function.
+ * @param {number} argumentIndx the index of the argument.
+ * @param {*} value The value of the argument.
+ * @return {string} The value as a string.
+ */
+function glFunctionArgToString(functionName, argumentIndex, value) {
+ var funcInfo = glValidEnumContexts[functionName];
+ if (funcInfo !== undefined) {
+ if (funcInfo[argumentIndex]) {
+ return glEnumToString(value);
+ }
+ }
+ return value.toString();
+}
+
+/**
+ * Given a WebglInstance context returns a wrapped context that calls
+ * gl.getError after every command and calls a function if the
+ * result is not gl.NO_ERROR.
+ *
+ * @param {!WebGLRenderingContext} ctx The webgl context to
+ * wrap.
+ * @param {!function(err, funcName, args): void} opt_onErrorFunc
+ * The function to call when gl.getError returns an
+ * error. If not specified the default function calls
+ * console.log with a message.
+ */
+function makeDebugContext(ctx, opt_onErrorFunc) {
+ init(ctx);
+ opt_onErrorFunc = opt_onErrorFunc || function(err, functionName, args) {
+ // apparently we can't do args.join(",");
+ var argStr = "";
+ for (var ii = 0; ii < args.length; ++ii) {
+ argStr += ((ii == 0) ? '' : ', ') +
+ glFunctionArgToString(functionName, ii, args[ii]);
+ }
+ log("WebglInstance error "+ glEnumToString(err) + " in "+ functionName +
+ "(" + argStr + ")");
+ };
+
+ // Holds booleans for each GL error so after we get the error ourselves
+ // we can still return it to the client app.
+ var glErrorShadow = { };
+
+ // Makes a function that calls a WebglInstance function and then calls getError.
+ function makeErrorWrapper(ctx, functionName) {
+ return function() {
+ var result = ctx[functionName].apply(ctx, arguments);
+ var err = ctx.getError();
+ if (err != 0) {
+ glErrorShadow[err] = true;
+ opt_onErrorFunc(err, functionName, arguments);
+ }
+ return result;
+ };
+ }
+
+ // Make a an object that has a copy of every property of the WebglInstance context
+ // but wraps all functions.
+ var wrapper = {};
+ for (var propertyName in ctx) {
+ if (typeof ctx[propertyName] == 'function') {
+ wrapper[propertyName] = makeErrorWrapper(ctx, propertyName);
+ } else {
+ wrapper[propertyName] = ctx[propertyName];
+ }
+ }
+
+ // Override the getError function with one that returns our saved results.
+ wrapper.getError = function() {
+ for (var err in glErrorShadow) {
+ if (glErrorShadow[err]) {
+ glErrorShadow[err] = false;
+ return err;
+ }
+ }
+ return ctx.NO_ERROR;
+ };
+
+ return wrapper;
+}
+
+function resetToInitialState(ctx) {
+ var numAttribs = ctx.getParameter(ctx.MAX_VERTEX_ATTRIBS);
+ var tmp = ctx.createBuffer();
+ ctx.bindBuffer(ctx.ARRAY_BUFFER, tmp);
+ for (var ii = 0; ii < numAttribs; ++ii) {
+ ctx.disableVertexAttribArray(ii);
+ ctx.vertexAttribPointer(ii, 4, ctx.FLOAT, false, 0, 0);
+ ctx.vertexAttrib1f(ii, 0);
+ }
+ ctx.deleteBuffer(tmp);
+
+ var numTextureUnits = ctx.getParameter(ctx.MAX_TEXTURE_IMAGE_UNITS);
+ for (var ii = 0; ii < numTextureUnits; ++ii) {
+ ctx.activeTexture(ctx.TEXTURE0 + ii);
+ ctx.bindTexture(ctx.TEXTURE_CUBE_MAP, null);
+ ctx.bindTexture(ctx.TEXTURE_2D, null);
+ }
+
+ ctx.activeTexture(ctx.TEXTURE0);
+ ctx.useProgram(null);
+ ctx.bindBuffer(ctx.ARRAY_BUFFER, null);
+ ctx.bindBuffer(ctx.ELEMENT_ARRAY_BUFFER, null);
+ ctx.bindFramebuffer(ctx.FRAMEBUFFER, null);
+ ctx.bindRenderbuffer(ctx.RENDERBUFFER, null);
+ ctx.disable(ctx.BLEND);
+ ctx.disable(ctx.CULL_FACE);
+ ctx.disable(ctx.DEPTH_TEST);
+ ctx.disable(ctx.DITHER);
+ ctx.disable(ctx.SCISSOR_TEST);
+ ctx.blendColor(0, 0, 0, 0);
+ ctx.blendEquation(ctx.FUNC_ADD);
+ ctx.blendFunc(ctx.ONE, ctx.ZERO);
+ ctx.clearColor(0, 0, 0, 0);
+ ctx.clearDepth(1);
+ ctx.clearStencil(-1);
+ ctx.colorMask(true, true, true, true);
+ ctx.cullFace(ctx.BACK);
+ ctx.depthFunc(ctx.LESS);
+ ctx.depthMask(true);
+ ctx.depthRange(0, 1);
+ ctx.frontFace(ctx.CCW);
+ ctx.hint(ctx.GENERATE_MIPMAP_HINT, ctx.DONT_CARE);
+ ctx.lineWidth(1);
+ ctx.pixelStorei(ctx.PACK_ALIGNMENT, 4);
+ ctx.pixelStorei(ctx.UNPACK_ALIGNMENT, 4);
+ ctx.pixelStorei(ctx.UNPACK_FLIP_Y_WEBGL, false);
+ ctx.pixelStorei(ctx.UNPACK_PREMULTIPLY_ALPHA_WEBGL, false);
+ // TODO: Delete this IF.
+ if (ctx.UNPACK_COLORSPACE_CONVERSION_WEBGL) {
+ ctx.pixelStorei(ctx.UNPACK_COLORSPACE_CONVERSION_WEBGL, ctx.BROWSER_DEFAULT_WEBGL);
+ }
+ ctx.polygonOffset(0, 0);
+ ctx.sampleCoverage(1, false);
+ ctx.scissor(0, 0, ctx.canvas.width, ctx.canvas.height);
+ ctx.stencilFunc(ctx.ALWAYS, 0, 0xFFFFFFFF);
+ ctx.stencilMask(0xFFFFFFFF);
+ ctx.stencilOp(ctx.KEEP, ctx.KEEP, ctx.KEEP);
+ ctx.viewport(0, 0, ctx.canvas.clientWidth, ctx.canvas.clientHeight);
+ ctx.clear(ctx.COLOR_BUFFER_BIT | ctx.DEPTH_BUFFER_BIT | ctx.STENCIL_BUFFER_BIT);
+
+ // TODO: This should NOT be needed but Firefox fails with 'hint'
+ while(ctx.getError());
+}
+
+function makeLostContextSimulatingContext(ctx) {
+ var wrapper_ = {};
+ var contextId_ = 1;
+ var contextLost_ = false;
+ var resourceId_ = 0;
+ var resourceDb_ = [];
+ var onLost_ = undefined;
+ var onRestored_ = undefined;
+ var nextOnRestored_ = undefined;
+
+ // Holds booleans for each GL error so can simulate errors.
+ var glErrorShadow_ = { };
+
+ function isWebGLObject(obj) {
+ //return false;
+ return (obj instanceof WebGLBuffer ||
+ obj instanceof WebGLFramebuffer ||
+ obj instanceof WebGLProgram ||
+ obj instanceof WebGLRenderbuffer ||
+ obj instanceof WebGLShader ||
+ obj instanceof WebGLTexture);
+ }
+
+ function checkResources(args) {
+ for (var ii = 0; ii < args.length; ++ii) {
+ var arg = args[ii];
+ if (isWebGLObject(arg)) {
+ return arg.__webglDebugContextLostId__ == contextId_;
+ }
+ }
+ return true;
+ }
+
+ function clearErrors() {
+ var k = Object.keys(glErrorShadow_);
+ for (var ii = 0; ii < k.length; ++ii) {
+ delete glErrorShdow_[k];
+ }
+ }
+
+ // Makes a function that simulates WebglInstance when out of context.
+ function makeLostContextWrapper(ctx, functionName) {
+ var f = ctx[functionName];
+ return function() {
+ // Only call the functions if the context is not lost.
+ if (!contextLost_) {
+ if (!checkResources(arguments)) {
+ glErrorShadow_[ctx.INVALID_OPERATION] = true;
+ return;
+ }
+ var result = f.apply(ctx, arguments);
+ return result;
+ }
+ };
+ }
+
+ for (var propertyName in ctx) {
+ if (typeof ctx[propertyName] == 'function') {
+ wrapper_[propertyName] = makeLostContextWrapper(ctx, propertyName);
+ } else {
+ wrapper_[propertyName] = ctx[propertyName];
+ }
+ }
+
+ function makeWebGLContextEvent(statusMessage) {
+ return {statusMessage: statusMessage};
+ }
+
+ function freeResources() {
+ for (var ii = 0; ii < resourceDb_.length; ++ii) {
+ var resource = resourceDb_[ii];
+ if (resource instanceof WebGLBuffer) {
+ ctx.deleteBuffer(resource);
+ } else if (resource instanceof WebctxFramebuffer) {
+ ctx.deleteFramebuffer(resource);
+ } else if (resource instanceof WebctxProgram) {
+ ctx.deleteProgram(resource);
+ } else if (resource instanceof WebctxRenderbuffer) {
+ ctx.deleteRenderbuffer(resource);
+ } else if (resource instanceof WebctxShader) {
+ ctx.deleteShader(resource);
+ } else if (resource instanceof WebctxTexture) {
+ ctx.deleteTexture(resource);
+ }
+ }
+ }
+
+ wrapper_.loseContext = function() {
+ if (!contextLost_) {
+ contextLost_ = true;
+ ++contextId_;
+ while (ctx.getError());
+ clearErrors();
+ glErrorShadow_[ctx.CONTEXT_LOST_WEBGL] = true;
+ setTimeout(function() {
+ if (onLost_) {
+ onLost_(makeWebGLContextEvent("context lost"));
+ }
+ }, 0);
+ }
+ };
+
+ wrapper_.restoreContext = function() {
+ if (contextLost_) {
+ if (onRestored_) {
+ setTimeout(function() {
+ freeResources();
+ resetToInitialState(ctx);
+ contextLost_ = false;
+ if (onRestored_) {
+ var callback = onRestored_;
+ onRestored_ = nextOnRestored_;
+ nextOnRestored_ = undefined;
+ callback(makeWebGLContextEvent("context restored"));
+ }
+ }, 0);
+ } else {
+ throw "You can not restore the context without a listener"
+ }
+ }
+ };
+
+ // Wrap a few functions specially.
+ wrapper_.getError = function() {
+ if (!contextLost_) {
+ var err;
+ while (err = ctx.getError()) {
+ glErrorShadow_[err] = true;
+ }
+ }
+ for (var err in glErrorShadow_) {
+ if (glErrorShadow_[err]) {
+ delete glErrorShadow_[err];
+ return err;
+ }
+ }
+ return ctx.NO_ERROR;
+ };
+
+ var creationFunctions = [
+ "createBuffer",
+ "createFramebuffer",
+ "createProgram",
+ "createRenderbuffer",
+ "createShader",
+ "createTexture"
+ ];
+ for (var ii = 0; ii < creationFunctions.length; ++ii) {
+ var functionName = creationFunctions[ii];
+ wrapper_[functionName] = function(f) {
+ return function() {
+ if (contextLost_) {
+ return null;
+ }
+ var obj = f.apply(ctx, arguments);
+ obj.__webglDebugContextLostId__ = contextId_;
+ resourceDb_.push(obj);
+ return obj;
+ };
+ }(ctx[functionName]);
+ }
+
+ var functionsThatShouldReturnNull = [
+ "getActiveAttrib",
+ "getActiveUniform",
+ "getBufferParameter",
+ "getContextAttributes",
+ "getAttachedShaders",
+ "getFramebufferAttachmentParameter",
+ "getParameter",
+ "getProgramParameter",
+ "getProgramInfoLog",
+ "getRenderbufferParameter",
+ "getShaderParameter",
+ "getShaderInfoLog",
+ "getShaderSource",
+ "getTexParameter",
+ "getUniform",
+ "getUniformLocation",
+ "getVertexAttrib"
+ ];
+ for (var ii = 0; ii < functionsThatShouldReturnNull.length; ++ii) {
+ var functionName = functionsThatShouldReturnNull[ii];
+ wrapper_[functionName] = function(f) {
+ return function() {
+ if (contextLost_) {
+ return null;
+ }
+ return f.apply(ctx, arguments);
+ }
+ }(wrapper_[functionName]);
+ }
+
+ var isFunctions = [
+ "isBuffer",
+ "isEnabled",
+ "isFramebuffer",
+ "isProgram",
+ "isRenderbuffer",
+ "isShader",
+ "isTexture"
+ ];
+ for (var ii = 0; ii < isFunctions.length; ++ii) {
+ var functionName = isFunctions[ii];
+ wrapper_[functionName] = function(f) {
+ return function() {
+ if (contextLost_) {
+ return false;
+ }
+ return f.apply(ctx, arguments);
+ }
+ }(wrapper_[functionName]);
+ }
+
+ wrapper_.checkFramebufferStatus = function(f) {
+ return function() {
+ if (contextLost_) {
+ return ctx.FRAMEBUFFER_UNSUPPORTED;
+ }
+ return f.apply(ctx, arguments);
+ };
+ }(wrapper_.checkFramebufferStatus);
+
+ wrapper_.getAttribLocation = function(f) {
+ return function() {
+ if (contextLost_) {
+ return -1;
+ }
+ return f.apply(ctx, arguments);
+ };
+ }(wrapper_.getAttribLocation);
+
+ wrapper_.getVertexAttribOffset = function(f) {
+ return function() {
+ if (contextLost_) {
+ return 0;
+ }
+ return f.apply(ctx, arguments);
+ };
+ }(wrapper_.getVertexAttribOffset);
+
+ wrapper_.isContextLost = function() {
+ return contextLost_;
+ };
+
+ function wrapEvent(listener) {
+ if (typeof(listener) == "function") {
+ return listener;
+ } else {
+ return function(info) {
+ listener.handleEvent(info);
+ }
+ }
+ }
+
+ wrapper_.registerOnContextLostListener = function(listener) {
+ onLost_ = wrapEvent(listener);
+ };
+
+ wrapper_.registerOnContextRestoredListener = function(listener) {
+ if (contextLost_) {
+ nextOnRestored_ = wrapEvent(listener);
+ } else {
+ onRestored_ = wrapEvent(listener);
+ }
+ }
+
+ return wrapper_;
+}
+
+return {
+ /**
+ * Initializes this module. Safe to call more than once.
+ * @param {!WebGLRenderingContext} ctx A WebglInstance context. If
+ * you have more than one context it doesn't matter which one
+ * you pass in, it is only used to pull out constants.
+ */
+ 'init': init,
+
+ /**
+ * Returns true or false if value matches any WebglInstance enum
+ * @param {*} value Value to check if it might be an enum.
+ * @return {boolean} True if value matches one of the WebglInstance defined enums
+ */
+ 'mightBeEnum': mightBeEnum,
+
+ /**
+ * Gets an string version of an WebglInstance enum.
+ *
+ * Example:
+ * WebGLDebugUtil.init(ctx);
+ * var str = WebGLDebugUtil.glEnumToString(ctx.getError());
+ *
+ * @param {number} value Value to return an enum for
+ * @return {string} The string version of the enum.
+ */
+ 'glEnumToString': glEnumToString,
+
+ /**
+ * Converts the argument of a WebglInstance function to a string.
+ * Attempts to convert enum arguments to strings.
+ *
+ * Example:
+ * WebGLDebugUtil.init(ctx);
+ * var str = WebGLDebugUtil.glFunctionArgToString('bindTexture', 0, gl.TEXTURE_2D);
+ *
+ * would return 'TEXTURE_2D'
+ *
+ * @param {string} functionName the name of the WebglInstance function.
+ * @param {number} argumentIndx the index of the argument.
+ * @param {*} value The value of the argument.
+ * @return {string} The value as a string.
+ */
+ 'glFunctionArgToString': glFunctionArgToString,
+
+ /**
+ * Given a WebglInstance context returns a wrapped context that calls
+ * gl.getError after every command and calls a function if the
+ * result is not NO_ERROR.
+ *
+ * You can supply your own function if you want. For example, if you'd like
+ * an exception thrown on any GL error you could do this
+ *
+ * function throwOnGLError(err, funcName, args) {
+ * throw WebGLDebugUtils.glEnumToString(err) + " was caused by call to" +
+ * funcName;
+ * };
+ *
+ * ctx = WebGLDebugUtils.makeDebugContext(
+ * canvas.getContext("webgl"), throwOnGLError);
+ *
+ * @param {!WebGLRenderingContext} ctx The webgl context to wrap.
+ * @param {!function(err, funcName, args): void} opt_onErrorFunc The function
+ * to call when gl.getError returns an error. If not specified the default
+ * function calls console.log with a message.
+ */
+ 'makeDebugContext': makeDebugContext,
+
+ /**
+ * Given a WebglInstance context returns a wrapped context that adds 4
+ * functions.
+ *
+ * ctx.loseContext:
+ * simulates a lost context event.
+ *
+ * ctx.restoreContext:
+ * simulates the context being restored.
+ *
+ * ctx.registerOnContextLostListener(listener):
+ * lets you register a listener for context lost. Use instead
+ * of addEventListener('webglcontextlostevent', listener);
+ *
+ * ctx.registerOnContextRestoredListener(listener):
+ * lets you register a listener for context restored. Use
+ * instead of addEventListener('webglcontextrestored',
+ * listener);
+ *
+ * @param {!WebGLRenderingContext} ctx The webgl context to wrap.
+ */
+ 'makeLostContextSimulatingContext': makeLostContextSimulatingContext,
+
+ /**
+ * Resets a context to the initial state.
+ * @param {!WebGLRenderingContext} ctx The webgl context to
+ * reset.
+ */
+ 'resetToInitialState': resetToInitialState
+};
+
+}();
+
diff --git a/lab4/src/lab4.html b/lab4/src/lab4.html
index 2bb37bcbd21a70f6bb9acddb83953d93aa5bf516..c3e0a625728311961f2071e7d67cd23afec55a30 100644
--- a/lab4/src/lab4.html
+++ b/lab4/src/lab4.html
@@ -5,12 +5,22 @@
<title>Lab 4</title>
</head>
<body onload="main()">
-<canvas width="400" height="600" id="my-canvas">
- Please use a browser that supports "canvas"
-</canvas>
+ <canvas width="400" height="600" id="my-canvas">
+ Please use a browser that supports "canvas"
+ </canvas>
+ <canvas width="400" height="600" id="my-canvas2">
+ Please use a browser that supports "canvas"
+ </canvas>
+ <p id="light_x_dir">Light X directionnal : </p>
+ <p id="light_y_dir">Light Y directionnal : </p>
+ <p id="light_z_dir">Light Z directionnal : </p>
+ <p id="light_x_point">Light X point : </p>
+ <p id="light_y_point">Light Y point : </p>
+ <p id="light_z_point">Light Z point : </p>
<script src="../lib/webgl-utils.js"></script>
<script src="../lib/webgl-debug.js"></script>
<script src="../lib/cuon-utils.js"></script>
+<script src="../lib/cuon-matrix.js"></script>
<script src="lab4.js"></script>
</body>
</html>
\ No newline at end of file
diff --git a/lab4/src/lab4.js b/lab4/src/lab4.js
index 105a227db9e7e4d4abde40b5002e7c75eb860fb4..14aadf23d197f62df2553cd584c46bf2be297361 100644
--- a/lab4/src/lab4.js
+++ b/lab4/src/lab4.js
@@ -1,18 +1,567 @@
-// Vertex shader program
-const VSHADER_SOURCE =
- '\n' +
- // TODO: Implement your vertex shader code here
- '\n';
-
-// Fragment shader program
-const FSHADER_SOURCE =
- '\n' +
- // TODO: Implement your fragment shader code here
- '\n';
+/*
+Author : Jorge José Goncalves
+*/
+
+// variable for camera and light
+var eyeX = 2;
+var eyeY = 4;
+var eyeZ = 6;
+const STEP = 0.1;
+var lightDirectionnalX = 0.5;
+var lightDirectionnalY = 3.0;
+var lightDirectionnalZ = 4.0;
+var lightPositionX = 0.0;
+var lightPositionY = 5.0;
+var lightPositionZ = 0.0;
+var OFFSCREEN_WIDTH = 2048;
+var OFFSCREEN_HEIGHT = 2048;
+var clicked_canvas = false;
+var x_clicked = 0;
+var y_clicked = 0;
+var VSHADER_SOURCE_DIRECTIONNAL_LIGHT =
+ 'attribute vec4 a_Position;\n' +
+ 'attribute vec4 a_Color;\n' +
+ 'attribute vec4 a_Normal;\n' +
+ 'uniform mat4 mMVP;\n' +
+ 'uniform mat4 mNormal;\n' +
+ 'uniform vec3 vLightDirection;\n' +
+ 'varying vec4 v_Color;\n' +
+ 'void main() {\n' +
+ ' gl_Position = mMVP * a_Position;\n' +
+ ' vec4 normal = mNormal * a_Normal;\n' +
+ ' float nDotL = max(dot(normalize(normal.xyz), vLightDirection), 0.0);\n' +
+ ' v_Color = vec4(a_Color.xyz * nDotL, a_Color.a);\n' +
+ '}\n';
+
+var FSHADER_SOURCE_DIRECTIONNAL_LIGHT =
+ '#ifdef GL_ES\n' +
+ 'precision mediump float;\n' +
+ '#endif\n' +
+ 'varying vec4 v_Color;\n' +
+ 'void main() {\n' +
+ ' gl_FragColor = v_Color;\n' +
+ '}\n';
+
+ var VSHADER_SOURCE_PONCTUAL_LIGHT =
+ 'attribute vec4 a_Position;\n' +
+ 'attribute vec4 a_Color;\n' +
+ 'attribute vec4 a_Normal;\n' +
+ 'uniform mat4 mMVP;\n' +
+ 'uniform mat4 mModel;\n' +
+ 'uniform mat4 mNormal;\n' +
+ 'varying vec4 v_Color;\n' +
+ 'varying vec3 normal;\n' +
+ 'varying vec4 vertexPosition;\n' +
+ 'uniform bool u_Clicked;\n' +
+ 'uniform bool u_is_hourglass;\n' +
+ 'uniform mat4 u_MvpMatrixFromLight;\n' +
+ 'varying vec4 v_PositionFromLight;\n' +
+ 'void main() {\n' +
+ ' gl_Position = mMVP * a_Position;\n' +
+ ' normal = normalize(vec3(mNormal * a_Normal));\n' +
+ ' vertexPosition = mModel * a_Position;\n' +
+ ' if(u_Clicked && u_is_hourglass) {\n' +
+ ' v_Color = vec4(0.0, 1.0, 0.0, 1.0);\n' +
+ ' } else {\n' +
+ ' v_Color = a_Color;\n' +
+ ' }\n' +
+ '}\n';
+
+var FSHADER_SOURCE_PONCTUAL_LIGHT =
+ '#ifdef GL_ES\n' +
+ 'precision mediump float;\n' +
+ '#endif\n' +
+ 'varying vec4 v_Color;\n' +
+ 'uniform vec3 vLightColor;\n' +
+ 'uniform vec3 vLightPosition;\n' +
+ 'varying vec3 normal;\n' +
+ 'varying vec4 vertexPosition;\n' +
+ 'varying vec4 v_PositionFromLight;\n' +
+ 'void main() {\n' +
+ ' vec3 vLightDirection = normalize(vLightPosition - vec3(vertexPosition));\n' +
+ ' float nDotL = max(dot(normal, vLightDirection), 0.0);\n' +
+ ' vec3 diffuse = vLightColor * v_Color.rgb * nDotL;\n' +
+ ' gl_FragColor = vec4(diffuse, v_Color.a);\n' +
+ '}\n';
+
+var SHADOW_VSHADER_SOURCE =
+ 'attribute vec4 a_Position;\n' +
+ 'uniform mat4 u_MvpMatrix;\n' +
+ 'void main() {\n' +
+ ' gl_Position = u_MvpMatrix * a_Position;\n' +
+ '}\n';
+
+var SHADOW_FSHADER_SOURCE =
+'#ifdef GL_ES\n' +
+'precision mediump float;\n' +
+'#endif\n' +
+'void main() {\n' +
+' gl_FragColor = vec4(gl_FragCoord.z, 0.0, 0.0, 0.0);\n' + // Write the z-value in R
+'}\n';
function main() {
- // Retrieve <canvas> element
- const canvas = document.getElementById('my-canvas');
+ //directionnal_light();
+ ponctual_light();
+ // Control camera or lights
+ document.addEventListener("keydown", (event) => {
+ switch (event.key) {
+ case 'a':
+ eyeX -= STEP;
+ break;
+ case 'd':
+ eyeX += STEP;
+ break;
+ case 's':
+ eyeY -= STEP;
+ break;
+ case 'w':
+ eyeY += STEP;
+ break;
+ case 'r':
+ eyeZ -= STEP;
+ break;
+ case 'f':
+ eyeZ += STEP;
+ break;
+ case 'ArrowRight':
+ lightDirectionnalX += STEP;
+ lightPositionX += STEP;
+ break;
+ case 'ArrowLeft':
+ lightDirectionnalX -= STEP;
+ lightPositionX -= STEP;
+ break;
+ case 'ArrowDown':
+ lightDirectionnalY -= STEP;
+ lightPositionY -= STEP;
+ break;
+ case 'ArrowUp':
+ lightDirectionnalY += STEP;
+ lightPositionY += STEP;
+ break;
+ case 'z':
+ lightDirectionnalZ += STEP;
+ lightPositionZ += STEP;
+ break;
+ case 'h':
+ lightDirectionnalZ -= STEP;
+ lightPositionZ -= STEP;
+ break;
+ default:
+ break;
+ }
+
+ // update html
+ document.getElementById("light_x_dir").textContent = "Light X directionnal : " + lightDirectionnalX
+ document.getElementById("light_y_dir").textContent = "Light Y directionnal : " + lightDirectionnalY
+ document.getElementById("light_z_dir").textContent = "Light Z directionnal : : " + lightDirectionnalZ
+
+ document.getElementById("light_x_point").textContent = "Light X point : " + lightPositionX
+ document.getElementById("light_y_point").textContent = "Light Y point : " + lightPositionY
+ document.getElementById("light_z_point").textContent = "Light Z point : " + lightPositionZ
+ });
+}
+
+function directionnal_light() {
+ var canvas = document.getElementById('my-canvas');
+
+ // Get the rendering context for WebGL
+ var gl = getWebGLContext(canvas);
+ if (!gl) {
+ console.log('Failed to get the rendering context for WebGL');
+ return;
+ }
+
+ // Initialize shaders for light directionnal
+ if (!initShaders(gl, VSHADER_SOURCE_DIRECTIONNAL_LIGHT, FSHADER_SOURCE_DIRECTIONNAL_LIGHT)) {
+ console.log('Failed to intialize shaders.');
+ return;
+ }
+
+ // Set the clear color and enable the depth test
+ gl.clearColor(0, 0, 0, 1);
+ gl.enable(gl.DEPTH_TEST);
+
+ // Get the storage locations
+ var mMVP = gl.getUniformLocation(gl.program, 'mMVP');
+ var mNormal = gl.getUniformLocation(gl.program, 'mNormal');
+ var vLightDirection = gl.getUniformLocation(gl.program, 'vLightDirection');
+ if (!mMVP || !mNormal || !vLightDirection) {
+ console.log('Failed to get the storage location');
+ return;
+ }
+
+ var vpMatrix = new Matrix4(); // View projection matrix
+
+ var tick = function () {
+ // Set perspective and camera
+ vpMatrix.setPerspective(50, canvas.width / canvas.height, 1, 100);
+ vpMatrix.lookAt(eyeX, eyeY, eyeZ, 0, 0, 0, 0, 1, 0);
+
+ // Set the light direction
+ var lightDirection = new Vector3([lightDirectionnalX, lightDirectionnalY, lightDirectionnalZ]);
+ lightDirection.normalize(); // Normalize
+ gl.uniform3fv(vLightDirection, lightDirection.elements);
+
+ // Clear color and depth buffer
+ gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
+
+ // Draw
+ drawHourGlass(gl, vpMatrix, mMVP, mNormal, null, false);
+ drawPlaneBase(gl, vpMatrix, mMVP, mNormal, null, false);
+
+ requestAnimationFrame(tick, canvas);
+ };
+ tick();
+}
+
+function ponctual_light() {
+ var canvas = document.getElementById('my-canvas2');
+ // Get the rendering context for WebGL
+ var gl = getWebGLContext(canvas);
+ if (!gl) {
+ console.log('Failed to get the rendering context for WebGL');
+ return;
+ }
+
+ // Initialize shaders shadow
+ if (!initShaders(gl, SHADOW_VSHADER_SOURCE, SHADOW_FSHADER_SOURCE)) {
+ console.log('Failed to intialize shaders.');
+ return;
+ }
+
+ // Initialize shaders
+ if (!initShaders(gl, VSHADER_SOURCE_PONCTUAL_LIGHT, FSHADER_SOURCE_PONCTUAL_LIGHT)) {
+ console.log('Failed to intialize shaders.');
+ return;
+ }
+
+ // Initialize framebuffer object (FBO)
+ var fbo = initFramebufferObject(gl);
+ if (!fbo) {
+ console.log('Failed to initialize frame buffer object');
+ return;
+ }
+ gl.activeTexture(gl.TEXTURE0); // Set a texture object to the texture unit
+ gl.bindTexture(gl.TEXTURE_2D, fbo.texture);
+
+ // Set the clear color and enable the depth test
+ gl.clearColor(0, 0, 0, 1);
+ gl.enable(gl.DEPTH_TEST);
+
+ // Get the storage locations
+ var mModel = gl.getUniformLocation(gl.program, 'mModel');
+ var mMVP = gl.getUniformLocation(gl.program, 'mMVP');
+ var mNormal = gl.getUniformLocation(gl.program, 'mNormal');
+ var vLightColor = gl.getUniformLocation(gl.program, 'vLightColor');
+ var vLightPosition = gl.getUniformLocation(gl.program, 'vLightPosition');
+ var u_Clicked = gl.getUniformLocation(gl.program, 'u_Clicked');
+ var u_is_hourglass = gl.getUniformLocation(gl.program, 'u_is_hourglass');
+ if (!mMVP || !mNormal || !vLightColor || !vLightPosition || !mModel || !u_Clicked) {
+ console.log('Failed to get the storage location');
+ return;
+ }
+
+ canvas.onmousedown = function(ev) { // Mouse is pressed
+ var x = ev.clientX, y = ev.clientY;
+ var rect = ev.target.getBoundingClientRect();
+ if (rect.left <= x && x < rect.right && rect.top <= y && y < rect.bottom) {
+ clicked_canvas = true;
+ x_clicked = x - rect.left;
+ y_clicked = rect.bottom - y;
+ }
+ }
+
+ var vpMatrix = new Matrix4(); // View projection matrix
+
+ var tick = function () {
+ // Set perspective and camera
+ vpMatrix.setPerspective(50, canvas.width / canvas.height, 1, 100);
+ vpMatrix.lookAt(eyeX, eyeY, eyeZ, 0, 0, 0, 0, 1, 0);
+
+ // Set the light color (white)
+ gl.uniform3f(vLightColor, 1.0, 1.0, 1.0);
+ // Set the light position
+ gl.uniform3f(vLightPosition, lightPositionX, lightPositionY, lightPositionZ);
+
+ // Clear color and depth buffer
+ gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
+
+ drawHourGlass(gl, vpMatrix, mMVP, mNormal, mModel, true, u_Clicked, u_is_hourglass);
+ drawPlaneBase(gl, vpMatrix, mMVP, mNormal, mModel, true, u_is_hourglass);
+
+ requestAnimationFrame(tick, canvas);
+ };
+ tick();
+}
+
+function drawPlaneBase(gl, vpMatrix, mMVP, mNormal, mModel, isPonct, u_is_hourglass) {
+ gl.uniform1i(u_is_hourglass, 0);
+ var n = initVertexBuffersPlaneBase(gl);
+ if (n < 0) {
+ console.log('Failed to set the vertex information');
+ return;
+ }
+
+ var modelMatrixTranslate = new Matrix4();
+ var mvpMatrix = new Matrix4();
+ var normalMatrix = new Matrix4();
+
+ modelMatrixTranslate.setTranslate(0, -0.001, 0);
+ if (isPonct) {
+ gl.uniformMatrix4fv(mModel, false, modelMatrixTranslate.elements);
+ }
+ mvpMatrix.set(vpMatrix).multiply(modelMatrixTranslate);
+ gl.uniformMatrix4fv(mMVP, false, mvpMatrix.elements);
+ normalMatrix.setInverseOf(modelMatrixTranslate);
+ normalMatrix.transpose();
+ gl.uniformMatrix4fv(mNormal, false, normalMatrix.elements);
+
+ gl.drawElements(gl.TRIANGLES, n, gl.UNSIGNED_BYTE, 0);
+}
+
+var angle = 0;
+var trans = 0;
+function drawHourGlass(gl, vpMatrix, mMVP, mNormal, mModel, isPonct, u_Clicked, u_is_hourglass) {
+ //angle += 1;
+ gl.uniform1i(u_is_hourglass, 1);
+ var n = initVertexBuffersHourglass(gl);
+ if (n < 0) {
+ console.log('Failed to set the vertex information');
+ return;
+ }
+
+ var modelMatrixRotate = new Matrix4(); // Model matrix
+ var modelMatrixTranslate = new Matrix4();
+ var modelMatrixScale = new Matrix4();
+ var mvpMatrix = new Matrix4(); // Model view projection matrix
+ var normalMatrix = new Matrix4(); // Transformation matrix for normals
+
+ // First frustrum
+ modelMatrixRotate.setRotate(0 + angle, 1, 0, 0); // Rotate around the y-axis
+ modelMatrixTranslate.setTranslate(0, 0.0 - trans, 0);
+ var finalModelMatrix = modelMatrixRotate.multiply(modelMatrixTranslate).multiply(modelMatrixScale);
+ if (isPonct) {
+ gl.uniformMatrix4fv(mModel, false, finalModelMatrix.elements);
+ }
+
+ mvpMatrix.set(vpMatrix).multiply(modelMatrixRotate);
+ gl.uniformMatrix4fv(mMVP, false, mvpMatrix.elements);
+ normalMatrix.setInverseOf(modelMatrixRotate);
+ normalMatrix.transpose();
+ gl.uniformMatrix4fv(mNormal, false, normalMatrix.elements);
+
+
+ gl.drawElements(gl.TRIANGLES, n, gl.UNSIGNED_BYTE, 0);
+
+ // Second frustrum
+ modelMatrixRotate.setRotate(180 + angle, 1, 0, 0);
+ modelMatrixTranslate.setTranslate(0, -2.0 + trans, 0);
+ modelMatrixScale.setScale(-1, 1, -1);
+ var finalModelMatrix = modelMatrixRotate.multiply(modelMatrixTranslate).multiply(modelMatrixScale);
+ if (isPonct) {
+ gl.uniformMatrix4fv(mModel, false, finalModelMatrix.elements);
+ }
+ mvpMatrix.set(vpMatrix).multiply(finalModelMatrix)
+ gl.uniformMatrix4fv(mMVP, false, mvpMatrix.elements);
+ normalMatrix.setInverseOf(finalModelMatrix);
+ normalMatrix.transpose();
+ gl.uniformMatrix4fv(mNormal, false, normalMatrix.elements);
+ gl.drawElements(gl.TRIANGLES, n, gl.UNSIGNED_BYTE, 0);
+
+ if(clicked_canvas){
+ var pixels = new Uint8Array(4); // Array for storing the pixel value
+ gl.readPixels(x_clicked, y_clicked, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixels);
+ console.log(pixels);
+ if(pixels[0] > 0){
+ console.log("Rouge");
+ if(isPonct){
+ gl.getUniform(gl.program, u_Clicked);
+ }
+ gl.uniform1i(u_Clicked, 1);
+ }
+ else if(pixels[1] > 0){
+ console.log("Vert");
+ gl.uniform1i(u_Clicked, 0);
+ }
+ clicked_canvas = false;
+ }
+}
+
+function initVertexBuffersPlaneBase(gl) {
+ var vertices_position = new Float32Array([
+ -2.0, -0.5, -2.0, 2.0, -0.5, 2.0, -2.0, -0.5, 2.0, 2.0, -0.5, -2.0
+ ]);
+
+ // Colors only white for this tp
+ var colors = new Float32Array([
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
+ ]);
+
+ var normals = new Float32Array([
+ 0.0, 1.0, 0.0, 0.0, 1.0, 0.0, 0.0, 1.0, 0.0, 0.0, 1.0, 0.0
+ ]);
+
+ var indices = new Uint8Array([
+ 0, 1, 2, 0, 1, 3
+ ]);
+
+ // Write the vertex property to buffers (positions, colors and normals)
+ if (!initArrayBuffer(gl, 'a_Position', vertices_position, 3, gl.FLOAT)) return -1;
+ if (!initArrayBuffer(gl, 'a_Color', colors, 3, gl.FLOAT)) return -1;
+ if (!initArrayBuffer(gl, 'a_Normal', normals, 3, gl.FLOAT)) return -1;
+
+ // Unbind the buffer object
+ gl.bindBuffer(gl.ARRAY_BUFFER, null);
+
+ // Write the indices to the buffer object
+ var indexBuffer = gl.createBuffer();
+ if (!indexBuffer) {
+ console.log('Failed to create the buffer object');
+ return false;
+ }
+ gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuffer);
+ gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, indices, gl.STATIC_DRAW);
+
+ return indices.length;
+}
+
+function initVertexBuffersHourglass(gl) {
+ var vertices_position = new Float32Array([
+ -0.25, 1.0, 0.25, 0.5, -0.5, 0.5, -0.5, -0.5, 0.5, 0.25, 1.0, 0.25, // front face
+ 0.25, 1.0, 0.25, 0.5, -0.5, -0.5, 0.5, -0.5, 0.5, 0.25, 1.0, -0.25,// right face
+ -0.25, 1.0, -0.25, 0.25, 1.0, 0.25, -0.25, 1.0, 0.25, 0.25, 1.0, -0.25, // Up face
+ -0.25, 1, -0.25, -0.5, -0.5, 0.5, -0.5, -0.5, -0.5, -0.25, 1.0, 0.25, // left face
+ -0.5, -0.5, -0.5, 0.5, -0.5, 0.5, -0.5, -0.5, 0.5, 0.5, -0.5, -0.5, // down face
+ 0.25, 1.0, -0.25, -0.5, -0.5, -0.5, 0.5, -0.5, -0.5, -0.25, 1.0, -0.25 // back face
+ ]);
+
+ // Colors only red for this tp
+ var colors = new Float32Array([
+ 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0,
+ 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0,
+ 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0,
+ 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0,
+ 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0,
+ 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0
+ ]);
+
+ var normals = new Float32Array([
+ 0.0, 1.0, 1.0, 0.0, 1.0, 1.0, 0.0, 1.0, 1.0, 0.0, 1.0, 1.0, // front face
+ 1.0, 1.0, 0.0, 1.0, 1.0, 0.0, 1.0, 1.0, 0.0, 1.0, 1.0, 0.0, // right face
+ 0.0, 1.0, 0.0, 0.0, 1.0, 0.0, 0.0, 1.0, 0.0, 0.0, 1.0, 0.0, // up face
+ -1.0, 1.0, 0.0, -1.0, 1.0, 0.0, -1.0, 1.0, 0.0, -1.0, 1.0, 0.0, // left face
+ 0.0, -1.0, 0.0, 0.0, -1.0, 0.0, 0.0, -1.0, 0.0, 0.0, -1.0, 0.0, // down face
+ 0.0, 1.0, -1.0, 0.0, 1.0, -1.0, 0.0, 1.0, -1.0, 0.0, 1.0, -1.0, // back face
+ ]);
+
+ var indices = new Uint8Array([
+ 0, 1, 2, 0, 1, 3, // front Face
+ 4, 5, 6, 4, 5, 7, // right face
+ 8, 9, 10, 8, 9, 11, // up face
+ 12, 13, 14, 12, 13, 15, // left face
+ 16, 17, 18, 16, 17, 19, // down face
+ 20, 21, 22, 20, 21, 23 // back face
+ ]);
+
+ // Write the vertex property to buffers (positions, colors and normals)
+ if (!initArrayBuffer(gl, 'a_Position', vertices_position, 3, gl.FLOAT)) return -1;
+ if (!initArrayBuffer(gl, 'a_Color', colors, 3, gl.FLOAT)) return -1;
+ if (!initArrayBuffer(gl, 'a_Normal', normals, 3, gl.FLOAT)) return -1;
+
+ // Unbind the buffer object
+ gl.bindBuffer(gl.ARRAY_BUFFER, null);
+
+ // Write the indices to the buffer object
+ var indexBuffer = gl.createBuffer();
+ if (!indexBuffer) {
+ console.log('Failed to create the buffer object');
+ return false;
+ }
+ gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuffer);
+ gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, indices, gl.STATIC_DRAW);
+
+ return indices.length;
+}
+
+function initArrayBuffer(gl, attribute, data, num, type) {
+ // Create a buffer object
+ var buffer = gl.createBuffer();
+ if (!buffer) {
+ console.log('Failed to create the buffer object');
+ return false;
+ }
+ // Write date into the buffer object
+ gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
+ gl.bufferData(gl.ARRAY_BUFFER, data, gl.STATIC_DRAW);
+ // Assign the buffer object to the attribute variable
+ var a_attribute = gl.getAttribLocation(gl.program, attribute);
+ if (a_attribute < 0) {
+ console.log('Failed to get the storage location of ' + attribute);
+ return false;
+ }
+ gl.vertexAttribPointer(a_attribute, num, type, false, 0, 0);
+ // Enable the assignment of the buffer object to the attribute variable
+ gl.enableVertexAttribArray(a_attribute);
+
+ return true;
+}
+
+function initFramebufferObject(gl) {
+ var framebuffer, texture, depthBuffer;
+
+ // Define the error handling function
+ var error = function() {
+ if (framebuffer) gl.deleteFramebuffer(framebuffer);
+ if (texture) gl.deleteTexture(texture);
+ if (depthBuffer) gl.deleteRenderbuffer(depthBuffer);
+ return null;
+ }
+
+ // Create a framebuffer object (FBO)
+ framebuffer = gl.createFramebuffer();
+ if (!framebuffer) {
+ console.log('Failed to create frame buffer object');
+ return error();
+ }
+
+ // Create a texture object and set its size and parameters
+ texture = gl.createTexture(); // Create a texture object
+ if (!texture) {
+ console.log('Failed to create texture object');
+ return error();
+ }
+ gl.bindTexture(gl.TEXTURE_2D, texture);
+ gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, OFFSCREEN_WIDTH, OFFSCREEN_HEIGHT, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
+ gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
+
+ // Create a renderbuffer object and Set its size and parameters
+ depthBuffer = gl.createRenderbuffer(); // Create a renderbuffer object
+ if (!depthBuffer) {
+ console.log('Failed to create renderbuffer object');
+ return error();
+ }
+ gl.bindRenderbuffer(gl.RENDERBUFFER, depthBuffer);
+ gl.renderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_COMPONENT16, OFFSCREEN_WIDTH, OFFSCREEN_HEIGHT);
+
+ // Attach the texture and the renderbuffer object to the FBO
+ gl.bindFramebuffer(gl.FRAMEBUFFER, framebuffer);
+ gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);
+ gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.RENDERBUFFER, depthBuffer);
+
+ // Check if FBO is configured correctly
+ var e = gl.checkFramebufferStatus(gl.FRAMEBUFFER);
+ if (gl.FRAMEBUFFER_COMPLETE !== e) {
+ console.log('Frame buffer object is incomplete: ' + e.toString());
+ return error();
+ }
+
+ framebuffer.texture = texture; // keep the required object
+
+ // Unbind the buffer object
+ gl.bindFramebuffer(gl.FRAMEBUFFER, null);
+ gl.bindTexture(gl.TEXTURE_2D, null);
+ gl.bindRenderbuffer(gl.RENDERBUFFER, null);
- // TODO: Complete with your code here
+ return framebuffer;
}
\ No newline at end of file