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use 'f' key to toggle front/back buffer rendering

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This commit is contained in:
Brian Paul 2005-08-31 16:42:59 +00:00
parent 2c8524b4fb
commit d5783737f1
1 changed files with 17 additions and 2 deletions
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19
progs/demos/reflect.c
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@ -50,6 +50,7 @@ struct window {
GLfloat xrot, yrot;
GLfloat spin;
GLenum showBuffer;
GLenum drawBuffer;
GLuint table_list;
GLuint objects_list[MAX_OBJECTS];
double t0;
@ -296,8 +297,10 @@ DrawWindow(void)
GLfloat dist = 20.0;
GLfloat eyex, eyey, eyez;
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
glDrawBuffer(w->drawBuffer);
glReadBuffer(w->drawBuffer);
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
eyex = dist * cos(w->yrot * DEG2RAD) * cos(w->xrot * DEG2RAD);
eyez = dist * sin(w->yrot * DEG2RAD) * cos(w->xrot * DEG2RAD);
@ -368,7 +371,10 @@ DrawWindow(void)
ShowAlphaBuffer(w->width, w->height);
}
glutSwapBuffers();
if (w->drawBuffer == GL_BACK)
glutSwapBuffers();
else
glFinish();
/* calc/show frame rate */
{
@ -442,6 +448,13 @@ Key(unsigned char key, int x, int y)
w->showBuffer = GL_NONE;
glutPostRedisplay();
break;
case 'f':
if (w->drawBuffer == GL_FRONT)
w->drawBuffer = GL_BACK;
else
w->drawBuffer = GL_FRONT;
glutPostRedisplay();
break;
case ' ':
w->anim = !w->anim;
w->t0 = -1;
@ -513,6 +526,7 @@ CreateWindow(void)
w->yrot = 50.0;
w->spin = 0.0;
w->showBuffer = GL_NONE;
w->drawBuffer = GL_BACK;
InitWindow(w);
@ -535,6 +549,7 @@ Usage(void)
printf(" d - show depth buffer\n");
printf(" s - show stencil buffer\n");
printf(" c - show color buffer\n");
printf(" f - toggle rendering to front/back color buffer\n");
printf(" n - create new window\n");
printf(" k - kill window\n");
printf(" SPACE - toggle animation\n");