void GLAPIENTRY
gluCylinder(GLUquadricObj * qobj,
GLdouble baseRadius, GLdouble topRadius,
GLdouble height, GLint slices, GLint stacks)
{
GLdouble da, r, dr, dz;
GLfloat x, y, z, nz, nsign;
GLint i, j;
if (qobj->Orientation == GLU_INSIDE) {
nsign = -1.0;
}
else {
nsign = 1.0;
}
da = 2.0 * M_PI / slices;
dr = (topRadius - baseRadius) / stacks;
dz = height / stacks;
nz = (baseRadius - topRadius) / height; /* Z component of normal vectors */
if (qobj->DrawStyle == GLU_POINT) {
glBegin(GL_POINTS);
for (i = 0; i < slices; i++) {
x = cos(i * da);
y = sin(i * da);
normal3f(x * nsign, y * nsign, nz * nsign);
z = 0.0;
r = baseRadius;
for (j = 0; j <= stacks; j++) {
glVertex3f(x * r, y * r, z);
z += dz;
r += dr;
}
}
glEnd();
}
else if (qobj->DrawStyle == GLU_LINE || qobj->DrawStyle == GLU_SILHOUETTE) {
/* Draw rings */
if (qobj->DrawStyle == GLU_LINE) {
z = 0.0;
r = baseRadius;
for (j = 0; j <= stacks; j++) {
glBegin(GL_LINE_LOOP);
for (i = 0; i < slices; i++) {
x = cos(i * da);
y = sin(i * da);
normal3f(x * nsign, y * nsign, nz * nsign);
glVertex3f(x * r, y * r, z);
}
glEnd();
z += dz;
r += dr;
}
}
else {
/* draw one ring at each end */
if (baseRadius != 0.0) {
glBegin(GL_LINE_LOOP);
for (i = 0; i < slices; i++) {
x = cos(i * da);
y = sin(i * da);
normal3f(x * nsign, y * nsign, nz * nsign);
glVertex3f(x * baseRadius, y * baseRadius, 0.0);
}
glEnd();
glBegin(GL_LINE_LOOP);
for (i = 0; i < slices; i++) {
x = cos(i * da);
y = sin(i * da);
normal3f(x * nsign, y * nsign, nz * nsign);
glVertex3f(x * topRadius, y * topRadius, height);
}
glEnd();
}
}
/* draw length lines */
glBegin(GL_LINES);
for (i = 0; i < slices; i++) {
x = cos(i * da);
y = sin(i * da);
normal3f(x * nsign, y * nsign, nz * nsign);
glVertex3f(x * baseRadius, y * baseRadius, 0.0);
glVertex3f(x * topRadius, y * topRadius, height);
}
glEnd();
}
else if (qobj->DrawStyle == GLU_FILL) {
GLfloat ds = 1.0 / slices;
GLfloat dt = 1.0 / stacks;
GLfloat t = 0.0;
z = 0.0;
r = baseRadius;
for (j = 0; j < stacks; j++) {
GLfloat s = 0.0;
glBegin(GL_QUAD_STRIP);
for (i = 0; i <= slices; i++) {
GLfloat x, y;
if (i == slices) {
x = sin(0.0);
y = cos(0.0);
}
else {
x = sin(i * da);
y = cos(i * da);
}
if (nsign == 1.0) {
normal3f(x * nsign, y * nsign, nz * nsign);
TXTR_COORD(s, t);
glVertex3f(x * r, y * r, z);
normal3f(x * nsign, y * nsign, nz * nsign);
TXTR_COORD(s, t + dt);
glVertex3f(x * (r + dr), y * (r + dr), z + dz);
}
else {
normal3f(x * nsign, y * nsign, nz * nsign);
TXTR_COORD(s, t);
glVertex3f(x * r, y * r, z);
normal3f(x * nsign, y * nsign, nz * nsign);
TXTR_COORD(s, t + dt);
glVertex3f(x * (r + dr), y * (r + dr), z + dz);
}
s += ds;
} /* for slices */
glEnd();
r += dr;
t += dt;
z += dz;
} /* for stacks */
}
}
void cylinder :: render(GemState *state)
{
setupParameters();
if(m_drawType==GL_DEFAULT_GEM)m_drawType=GL_FILL;
GLdouble da, r, dr, dz;
GLfloat x, y, z, nz;
GLint i, j;
/* coverity[dead_error_condition] we might want to play with orientation (FIXME) */
GLboolean orientation = false; /* true=INSIDE */
GLfloat nsign = (orientation)?-1.0:1.0;
TexCoord*texCoords=NULL;
int texType=0;
int texNum=0;
bool lighting=false;
state->get(GemState::_GL_TEX_COORDS, texCoords);
state->get(GemState::_GL_TEX_TYPE, texType);
state->get(GemState::_GL_TEX_NUMCOORDS, texNum);
state->get(GemState::_GL_LIGHTING, lighting);
GLfloat xsize = 1.0, xsize0 = 0.0;
GLfloat ysize = 1.0, ysize0 = 0.0;
if(texType && texNum>=3){
xsize0 = texCoords[0].s;
xsize = texCoords[1].s-xsize0;
ysize0 = texCoords[1].t;
ysize = texCoords[2].t-ysize0;
}
glPushMatrix();
glTranslatef(0.f, 0.f, -m_size);
// gluCylinder(m_thing, m_size, m_size, m_size * 2, m_numSlices, m_numSlices);
da = 2.0 * M_PI / slices;
dr = (topRadius - baseRadius) / stacks;
dz = height / stacks;
nz = (baseRadius - topRadius) / height; /* Z component of normal vectors */
if (m_drawType == GL_POINT) {
glBegin(GL_POINTS);
for (i = 0; i < slices; i++) {
x = cos(i * da);
y = sin(i * da);
normal3f(x * nsign, y * nsign, nz * nsign);
z = 0.0;
r = baseRadius;
for (j = 0; j <= stacks; j++) {
glVertex3f(x * r, y * r, z);
z += dz;
r += dr;
}
}
glEnd();
}
else if (m_drawType == GL_LINE || m_drawType == GLU_SILHOUETTE) {
/* Draw rings */
if (m_drawType == GL_LINE) {
z = 0.0;
r = baseRadius;
for (j = 0; j <= stacks; j++) {
glBegin(GL_LINE_LOOP);
for (i = 0; i < slices; i++) {
x = cos(i * da);
y = sin(i * da);
normal3f(x * nsign, y * nsign, nz * nsign);
glVertex3f(x * r, y * r, z);
}
glEnd();
z += dz;
r += dr;
}
}
else {
/* draw one ring at each end */
if (baseRadius != 0.0) {
glBegin(GL_LINE_LOOP);
for (i = 0; i < slices; i++) {
x = cos(i * da);
y = sin(i * da);
normal3f(x * nsign, y * nsign, nz * nsign);
glVertex3f(x * baseRadius, y * baseRadius, 0.0);
}
glEnd();
glBegin(GL_LINE_LOOP);
for (i = 0; i < slices; i++) {
x = cos(i * da);
y = sin(i * da);
normal3f(x * nsign, y * nsign, nz * nsign);
glVertex3f(x * topRadius, y * topRadius, height);
}
glEnd();
}
}
/* draw length lines */
glBegin(GL_LINES);
for (i = 0; i < slices; i++) {
x = cos(i * da);
y = sin(i * da);
normal3f(x * nsign, y * nsign, nz * nsign);
glVertex3f(x * baseRadius, y * baseRadius, 0.0);
glVertex3f(x * topRadius, y * topRadius, height);
}
glEnd();
}
else if (m_drawType == GL_FILL) {
GLfloat ds = 1.0 / slices;
GLfloat dt = 1.0 / stacks;
GLfloat t = 0.0;
z = 0.0;
r = baseRadius;
for (j = 0; j < stacks; j++) {
GLfloat s = 0.0;
glBegin(GL_QUAD_STRIP);
for (i = 0; i <= slices; i++) {
GLfloat x, y;
if (i == slices) {
x = sin(0.0);
y = cos(0.0);
}
else {
x = sin(i * da);
y = cos(i * da);
}
normal3f(x * nsign, y * nsign, nz * nsign);
if(texType)glTexCoord2f(s*xsize+xsize0, t*ysize+ysize0);
glVertex3f(x * r, y * r, z);
normal3f(x * nsign, y * nsign, nz * nsign);
if(texType)glTexCoord2f(s*xsize+xsize0, (t + dt)*ysize+ysize0);
glVertex3f(x * (r + dr), y * (r + dr), z + dz);
s += ds;
} /* for slices */
glEnd();
r += dr;
t += dt;
z += dz;
} /* for stacks */
}
glPopMatrix();
}
