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glsphere.cpp
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Fri, Jan 24, 10:29

glsphere.cpp
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#include "glsphere.h"
#define _USE_CMATH_DEFINES
#include <cmath>
#ifndef M_PI
#define M_PI 3.141592654
#endif
#include "skerror.h"
using namespace symkit;
void models::GLSphere::initialize()
{
groups.reserve(3);
registerGroup(GL_TRIANGLE_FAN);
registerGroup(GL_QUADS);
registerGroup(GL_TRIANGLE_FAN);
QVector<GLfloat> positions;
QVector<GLuint> indices0;
QVector<GLuint> indices1;
QVector<GLuint> indices2;
GLuint size(2 + slices * (stacks - 1));
positions.reserve(3 * size);
const double alpha(M_PI / double(stacks));
const double beta(2.0*M_PI / double(slices));
positions << 0.0 << 0.0 << 1.0;
for (GLuint i(1); i < stacks; ++i) {
for (GLuint j(0); j < slices; ++j) {
float r = sin(i*alpha);
float z = cos(i*alpha);
float y = sin(j*beta) * r;
float x = cos(j*beta) * r;
positions << x << y << z;
}
}
positions << 0.0 << 0.0 << -1.0;
indices0.reserve(slices+2);
for (GLuint i(0); i <= slices; ++i)
indices0 << i;
indices0 << 1;
indices1.reserve((stacks-2) * 4 * slices);
for (GLuint i(0); i < stacks-2; ++i) {
for (GLuint j(0); j < slices; ++j) {
indices1 << 1+i*slices+j;
indices1 << 1+(i+1)*slices+j;
indices1 << 1+(i+1)*slices+(j+1)%slices;
indices1 << 1+i*slices+(j+1)%slices;
}
}
indices2.reserve(slices+2);
for (GLuint i(1); i <= slices+1; ++i)
indices2 << size-i;
indices2 << size-2;
/* initialize buffer */
if (!enableVBO())
throw SKError( ERR_INIT,
"models::sphere",
"",
"Could not enable VBO GLBuffer");
vbo_size = 3 * size * sizeof(GLfloat);
if (!vbo.bind())
throw SKError( ERR_INIT,
"models::sphere",
"",
"Could not bind VBO");
vbo.allocate(positions.constData(), vbo_size);
vbo.release();
#define IBO_SZ(i) groups[i].ibo_size
IBO_SZ(0) = indices0.size() * sizeof(GLuint);
IBO_SZ(1) = indices1.size() * sizeof(GLuint);
IBO_SZ(2) = indices2.size() * sizeof(GLuint);
if (!enableIBO())
throw SKError( ERR_INIT,
"models::sphere",
"",
"Could not enable IBO GLBuffer");
if (!ibo.bind())
throw SKError( ERR_INIT,
"models::sphere",
"",
"Could not bind IBO");
ibo.allocate(IBO_SZ(0) + IBO_SZ(1) + IBO_SZ(2));
ibo.write(0 , indices0.constData(), IBO_SZ(0));
ibo.write(IBO_SZ(0) , indices1.constData(), IBO_SZ(1));
ibo.write(IBO_SZ(0) + IBO_SZ(1), indices2.constData(), IBO_SZ(2));
ibo.release();
}
models::GLSphere::GLSphere(GLuint slices, GLuint stacks)
: GLModel(), slices(slices), stacks(stacks)
{
}
models::GLSphere::GLSphere(const GLSphere& init)
: GLModel(init), slices(init.slices), stacks(init.stacks)
{
}

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