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progs/tests: add line drawing option to cylwrap.c

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This commit is contained in:
Brian Paul 2010-02-05 10:54:40 -07:00 • committed by Michal Krol
parent 22a3a817aa
commit fd6701029b
1 changed files with 34 additions and 10 deletions
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44
progs/tests/cylwrap.c
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@ -12,6 +12,7 @@ static int Win;
static int WinWidth = 600, WinHeight = 400;
static GLfloat Xrot = 0, Yrot = 0;
static GLboolean CylWrap = GL_TRUE;
static GLboolean Lines = GL_FALSE;
@ -32,17 +33,35 @@ DrawSample(GLboolean wrap)
glEnable(GL_TEXTURE_2D);
/* texured quad */
glBegin(GL_QUAD_STRIP);
for (p = 0.0; p <= 1.001; p += 0.1) {
float x = -2.0 + p * 4.0;
float s = p + 0.5;
if (wrap && s > 1.0)
s -= 1.0;
glTexCoord2f(s, 0); glVertex2f(x, -1);
glTexCoord2f(s, 1); glVertex2f(x, +1);
if (Lines) {
/* texured lines */
float t;
for (t = 0; t <= 1.0; t += 0.125) {
float y = -1.0 + 2.0 * t;
glBegin(GL_LINE_STRIP);
for (p = 0.0; p <= 1.001; p += 0.05) {
float x = -2.0 + p * 4.0;
float s = p + 0.5;
if (wrap && s > 1.0)
s -= 1.0;
glTexCoord2f(s, t); glVertex2f(x, y);
}
glEnd();
}
}
else {
/* texured quads */
glBegin(GL_QUAD_STRIP);
for (p = 0.0; p <= 1.001; p += 0.1) {
float x = -2.0 + p * 4.0;
float s = p + 0.5;
if (wrap && s > 1.0)
s -= 1.0;
glTexCoord2f(s, 0); glVertex2f(x, -1);
glTexCoord2f(s, 1); glVertex2f(x, +1);
}
glEnd();
}
glEnd();
glDisable(GL_TEXTURE_2D);
@ -138,6 +157,10 @@ Key(unsigned char key, int x, int y)
else
printf("Cylindrical wrap off.\n");
break;
case 'l':
case 'L':
Lines = !Lines;
break;
case 27:
glutDestroyWindow(Win);
exit(0);
@ -215,6 +238,7 @@ Init(void)
glPointSize(3.0);
printf("Press 'c' to toggle cylindrical wrap mode.\n");
printf("Press 'l' to toggle line / quad drawing.\n");
}