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@@ -17,4 +17,203 @@
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```
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const int j(i & 3), k(i & ~3);
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の部分の & は何をしてますか？
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の部分の & は何をしてますか？
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---追記---
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GLFW による OpenGL 入門(130p)
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http://marina.sys.wakayama-u.ac.jp/~tokoi/GLFWdraft.pdf
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をやってます。実行できます
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```
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#pragma once
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#include <algorithm>
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#include <GL/glew.h>
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#include <cmath>
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class Matrix
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{
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GLfloat matrix[16];
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public:
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Matrix() {}
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Matrix(const GLfloat *a)
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{
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std::copy(a, a + 16, matrix);
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}
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const GLfloat *data() const
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{
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return matrix;
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}
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void loadIdentity()
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{
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std::fill(matrix, matrix + 16, 0.0f);
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matrix[0] = matrix[5] = matrix[10] = matrix[15] = 1.0f;
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}
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static Matrix identity()
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{
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Matrix t;
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t.loadIdentity();
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return t;
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}
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static Matrix translate(GLfloat x, GLfloat y, GLfloat z)
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{
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Matrix t;
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t.loadIdentity();
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t.matrix[12] = x;
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t.matrix[13] = y;
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t.matrix[14] = z;
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return t;
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}
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static Matrix scale(GLfloat x, GLfloat y, GLfloat z)
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{
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Matrix t;
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t.loadIdentity();
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t.matrix[0] = x;
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t.matrix[5] = y;
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t.matrix[10] = z;
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return t;
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}
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static Matrix shearXY(GLfloat angle)
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{
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Matrix t;
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t.loadIdentity();
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t.matrix[4] = angle;
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return t;
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}
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static Matrix shearYZ(GLfloat angle)
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{
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Matrix t;
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t.loadIdentity();
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t.matrix[9] = angle;
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return t;
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}
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static Matrix shearZX(GLfloat angle)
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{
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Matrix t;
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t.loadIdentity();
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t.matrix[2] = angle;
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return t;
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}
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static Matrix shearYX(GLfloat angle)
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{
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Matrix t;
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t.loadIdentity();
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t.matrix[1] = angle;
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return t;
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}
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static Matrix shearZY(GLfloat angle)
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{
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Matrix t;
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t.loadIdentity();
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t.matrix[6] = angle;
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return t;
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}
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static Matrix shearXZ(GLfloat angle)
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{
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Matrix t;
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t.loadIdentity();
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t.matrix[8] = angle;
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return t;
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}
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static Matrix rotationX(GLfloat angle)
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{
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Matrix t;
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t.loadIdentity();
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t.matrix[5] = cos(angle);
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t.matrix[6] = sin(angle);
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t.matrix[9] = -sin(angle);
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t.matrix[10] = cos(angle);
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return t;
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}
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static Matrix rotationY(GLfloat angle)
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{
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Matrix t;
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t.loadIdentity();
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t.matrix[0] = cos(angle);
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t.matrix[2] = sin(angle);
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t.matrix[8] = -sin(angle);
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t.matrix[10] = cos(angle);
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return t;
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}
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static Matrix rotationZ(GLfloat angle)
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{
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Matrix t;
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t.loadIdentity();
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t.matrix[0] = cos(angle);
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t.matrix[1] = sin(angle);
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t.matrix[4] = -sin(angle);
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t.matrix[5] = cos(angle);
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return t;
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}
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static Matrix rotate(GLfloat a, GLfloat x, GLfloat y, GLfloat z)
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{
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Matrix t;
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const GLfloat d(sqrt(x * x + y * y + z * z));
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if (d > 0.0f)
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{
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const GLfloat l(x / d), m(y / d), n(z / d);
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const GLfloat l2(l * l), m2(m * m), n2(n * n);
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const GLfloat lm(l * m), mn(m * n), nl(n * l);
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const GLfloat c(cos(a)), c1(1.0f - c), s(sin(a));
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t.loadIdentity();
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t.matrix[0] = (1.0f - l2) * c + l2;
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t.matrix[1] = lm * c1 + n * s;
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t.matrix[2] = nl * c1 - m * s;
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t.matrix[4] = lm * c1 - n * s;
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t.matrix[5] = (1.0f - m2) * c + m2;
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t.matrix[6] = mn * c1 + l * s;
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t.matrix[8] = nl * c1 + m * s;
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t.matrix[9] = mn * c1 - l * s;
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t.matrix[10] = (1.0f - n2) * c + n2;
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}
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return t;
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}
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Matrix operator*(const Matrix &m) const
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{
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Matrix t;
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for (int i = 0; i < 16; ++i)
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{
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const int j(i & 3), k(i & ~3);
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t.matrix[i] =
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matrix[0 + j] * matrix[k + 0] +
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matrix[4 + j] * matrix[k + 1] +
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matrix[8 + j] * matrix[k + 2] +
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matrix[12+j] * matrix[k + 3];
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}
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return t;
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}
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};
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```
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