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December 30, 2011 08:46
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glTranslatef()を使う場合と等価なglMultMatrixf()の使い方サンプル
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#ifdef WIN32 | |
#include <SDKDDKVer.h> | |
#include <Windows.h> | |
#ifdef _DEBUG | |
#pragma comment(lib, "freeglutD.lib") | |
#else | |
#pragma comment(lib, "freeglut.lib") | |
#endif | |
#endif | |
#include <GL/GL.h> | |
#include <GL/freeglut.h> | |
void key_cb(unsigned char key, int x, int y) | |
{ | |
if (key == 27 || key == 'q') { | |
glutLeaveMainLoop(); | |
} | |
} | |
void reshape_cb(int w, int h) | |
{ | |
glViewport (0, 0, w, h); | |
glMatrixMode(GL_PROJECTION); | |
glLoadIdentity(); | |
if (w > h) { | |
glOrtho(-(float)w/h, (float)w/h, -1.0f, 1.0f, -1.0f, 1.0f); | |
} | |
else { | |
glOrtho(-1.0f, 1.0f, -(float)h/w, (float)h/w, -1.0f, 1.0f); | |
} | |
glMatrixMode(GL_MODELVIEW); | |
glLoadIdentity(); | |
} | |
void timer_cb (int value) | |
{ | |
glutTimerFunc(30, timer_cb, 0); | |
glutPostRedisplay(); | |
} | |
#define SET_IDENTITY_MATRIX(m) { \ | |
m[ 0]=1.0f; m[ 1]=0.0f; m[ 2]=0.0f; m[ 3]=0.0f; \ | |
m[ 4]=0.0f; m[ 5]=1.0f; m[ 6]=0.0f; m[ 7]=0.0f; \ | |
m[ 8]=0.0f; m[ 9]=0.0f; m[10]=1.0f; m[11]=0.0f; \ | |
m[12]=0.0f; m[13]=0.0f; m[14]=0.0f; m[15]=1.0f; \ | |
} | |
void display_cb (void) | |
{ | |
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); | |
glMatrixMode(GL_MODELVIEW); | |
// using glTranslatef() | |
glPushMatrix(); | |
{ | |
glTranslatef(-0.6f, 0.0f, 0.0f); | |
glutSolidTeapot(0.4); | |
} | |
glPopMatrix(); | |
// | |
// glTranslatef(x, y, z) = | 1 0 0 0 | | |
// | 0 1 0 0 | | |
// | 0 0 1 0 | | |
// | x y z 1 | | |
glPushMatrix(); | |
{ | |
GLfloat mat[16]; | |
SET_IDENTITY_MATRIX(mat); | |
mat[12] = 0.6f; // x->mat[12], y->mat[13], z->mat[14] | |
glMultMatrixf(mat); | |
glutSolidTeapot(0.4); | |
} | |
glPopMatrix(); | |
glutSwapBuffers(); | |
} | |
int main(int argc, char* argv[]) | |
{ | |
glutInit(&argc, argv); | |
glutInitWindowSize(640, 480); | |
// GLUT settings | |
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH); | |
glutCreateWindow(argv[0]); | |
glutKeyboardFunc(key_cb); | |
glutDisplayFunc(display_cb); | |
glutReshapeFunc(reshape_cb); | |
glutTimerFunc(30, timer_cb, 0); | |
// OpenGL settings | |
glClearColor(0.0f, 0.0f, 0.3f, 1.0f); | |
GLfloat light_diffuse[] = {0.7f, 0.7f, 0.7f, 1.0f}; | |
GLfloat light_position[] = {2.0f, 2.0f, 10.0f, 1.0f}; | |
glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse); | |
glLightfv(GL_LIGHT0 , GL_POSITION , light_position); | |
glEnable(GL_LIGHT0); | |
glEnable(GL_LIGHTING); | |
glEnable(GL_DEPTH_TEST); | |
glShadeModel(GL_SMOOTH); | |
glutMainLoop(); | |
return 0; | |
} |
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マトリックスを使うと平行移動・回転・スケールを一度に保持できる点がうれしいかも?