VBOSphere::VBOSphere(float rad, GLuint sl, GLuint st) :
radius(rad), slices(sl), stacks(st)
{
nVerts = (slices+1) * (stacks + 1);
elements = (slices * 2 * (stacks-1) ) * 3;
// Verts
float * v = new float[3 * nVerts];
// Normals
float * n = new float[3 * nVerts];
// Tex coords
float * tex = new float[2 * nVerts];
// Elements
unsigned int * el = new unsigned int[elements];
// Generate the vertex data
generateVerts(v, n, tex, el);
// Create and populate the buffer objects
unsigned int handle[4];
glGenBuffers(4, handle);
glBindBuffer(GL_ARRAY_BUFFER, handle[0]);
glBufferData(GL_ARRAY_BUFFER, (3 * nVerts) * sizeof(float), v, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, handle[1]);
glBufferData(GL_ARRAY_BUFFER, (3 * nVerts) * sizeof(float), n, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, handle[2]);
glBufferData(GL_ARRAY_BUFFER, (2 * nVerts) * sizeof(float), tex, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, handle[3]);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, elements * sizeof(unsigned int), el, GL_STATIC_DRAW);
delete [] v;
delete [] n;
delete [] el;
delete [] tex;
// Create the VAO
glGenVertexArrays( 1, &vaoHandle );
glBindVertexArray(vaoHandle);
glEnableVertexAttribArray(0); // Vertex position
glBindBuffer(GL_ARRAY_BUFFER, handle[0]);
glVertexAttribPointer( (GLuint)0, 3, GL_FLOAT, GL_FALSE, 0, 0 );
glEnableVertexAttribArray(1); // Vertex normal
glBindBuffer(GL_ARRAY_BUFFER, handle[1]);
glVertexAttribPointer( (GLuint)1, 3, GL_FLOAT, GL_FALSE, 0, 0 );
glBindBuffer(GL_ARRAY_BUFFER, handle[2]);
glEnableVertexAttribArray(2); // Texture coords
glVertexAttribPointer( (GLuint)2, 2, GL_FLOAT, GL_FALSE, 0, 0 );
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, handle[3]);
glBindVertexArray(0);
}
VBOTorus::VBOTorus(float outerRadius, float innerRadius, int nsides, int nrings) :
rings(nrings), sides(nsides)
{
faces = sides * rings;
int nVerts = sides * (rings+1); // One extra ring to duplicate first ring
// Verts
float * v = new float[3 * nVerts];
// Normals
float * n = new float[3 * nVerts];
// Tex coords
float * tex = new float[2 * nVerts];
// Elements
unsigned int * el = new unsigned int[6 * faces];
// Generate the vertex data
generateVerts(v, n, tex, el, outerRadius, innerRadius);
// Create and populate the buffer objects
unsigned int handle[4];
glGenBuffers(4, handle);
glBindBuffer(GL_ARRAY_BUFFER, handle[0]);
glBufferData(GL_ARRAY_BUFFER, (3 * nVerts) * sizeof(float), v, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, handle[1]);
glBufferData(GL_ARRAY_BUFFER, (3 * nVerts) * sizeof(float), n, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, handle[2]);
glBufferData(GL_ARRAY_BUFFER, (2 * nVerts) * sizeof(float), tex, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, handle[3]);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, 6 * faces * sizeof(unsigned int), el, GL_STATIC_DRAW);
delete [] v;
delete [] n;
delete [] el;
delete [] tex;
// Create the VAO
glGenVertexArrays( 1, &vaoHandle );
glBindVertexArray(vaoHandle);
glEnableVertexAttribArray(0); // Vertex position
glBindBuffer(GL_ARRAY_BUFFER, handle[0]);
glVertexAttribPointer( (GLuint)0, 3, GL_FLOAT, GL_FALSE, 0, ((GLubyte *)NULL + (0)) );
glEnableVertexAttribArray(1); // Vertex normal
glBindBuffer(GL_ARRAY_BUFFER, handle[1]);
glVertexAttribPointer( (GLuint)1, 3, GL_FLOAT, GL_FALSE, 0, ((GLubyte *)NULL + (0)) );
glBindBuffer(GL_ARRAY_BUFFER, handle[2]);
glEnableVertexAttribArray(2); // Texture coords
glVertexAttribPointer( (GLuint)2, 2, GL_FLOAT, GL_FALSE, 0, ((GLubyte *)NULL + (0)) );
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, handle[3]);
glBindVertexArray(0);
}
