/** This function should be called whenever a mouse cursor motion
* occurs and is automatically called by
* mousemove_glfwCursorPosCallback() and mousemove_glutMotionFunc()
*
* @param x The x coordinate of the mouse cursor.
* @param y The y coordinate of the mouse cursor.
* @return 1 if the scene needs to be redawn, 0 otherwise.
*/
int mousemove_movement(int x, int y)
{
if(cur_button == -1)
return 0;
/* Distance cursor has moved since last press. */
int dx = x-last_x;
int dy = y-last_y;
/* Vectors to store our orthonormal basis. */
float f[3], r[3], u[3];
// Calculate a new vector pointing from the camera to the
// look at point and normalize it.
vec3f_sub_new(f,cam_lookat_down,cam_position_down);
vec3f_normalize(f);
// Get our up vector
vec3f_copy(u,cam_up);
// Get a right vector based on the up and lookat vector.
vec3f_cross_new(r, f, u);
// If right vector was short, then look vector was pointing in
// nearly the same direction as the up vector.
if(vec3f_normSq(r) < EPSILON)
{
//printf("mousemove: whoops, pointed camera at up vector.");
// move the up vector slightly and try again:
u[0] += 0.05;
vec3f_cross_new(r,f,u);
}
vec3f_normalize(r);
// recalculate the up vector from the right vector and up vector
// to ensure we have a an orthonormal basis.
vec3f_cross_new(u, r, f);
vec3f_normalize(u);
switch(cur_button)
{
case 0: // left mouse button - translate left/right or up/down
/* Translate the camera along the right and up vectors
* appropriately depending on the type of mouse movement. */
for(int i=0; i<3; i++)
{
float offset = r[i]*dx*settings_trans_scale + -u[i]*dy*settings_trans_scale;
cam_position[i] = cam_position_down[i] - offset;
cam_lookat[i] = cam_lookat_down[i] - offset;
}
break;
case 1: // middle mouse button - translate forward and back
mousemove_translate_inout(dy, f);
break;
case 2: // right mouse button - rotate
// If the mouse is moved left/right, rotate the facing
// vector around the up vector.
mousemove_private_rotate_point(dx*settings_rot_scale, u, f);
// If the mouse is moved up/down, rotate the facing vector
// around the right vector.
mousemove_private_rotate_point(dy*settings_rot_scale, r, f);
vec3f_normalize(f);
// Add new facing vector to the position that the camera
// was at when the button was first pressed to get a new
// lookat point.
vec3f_add_new(cam_lookat, cam_position_down, f);
break;
}
return 1;
}
/** Creates a cylinder geometry object. */
void init_geometryCylinder(kuhl_geometry *cyl, GLuint prog)
{
int numSides=50;
GLfloat vertices[1024];
GLfloat normals[1024];
GLuint indices[1024];
GLfloat texcoords[1024];
int verticesIndex = 0;
int normalsIndex = 0;
int indicesIndex = 0;
int texcoordsIndex = 0;
// Bottom middle
vertices[verticesIndex++] = 0;
vertices[verticesIndex++] = -.5;
vertices[verticesIndex++] = -0;
normals[normalsIndex++] = 0;
normals[normalsIndex++] = -1;
normals[normalsIndex++] = 0;
texcoords[texcoordsIndex++] = 0;
texcoords[texcoordsIndex++] = 0;
// For each vertex around bottom perimeter
for(int i=0; i<numSides; i++)
{
vertices[verticesIndex++] = .5*sin(i*2*M_PI/numSides);
vertices[verticesIndex++] = -.5;
vertices[verticesIndex++] = .5*cos(i*2*M_PI/numSides);
normals[normalsIndex++] = 0;
normals[normalsIndex++] = -1;
normals[normalsIndex++] = 0;
texcoords[texcoordsIndex++] = 0;
texcoords[texcoordsIndex++] = 0;
}
// For each face/triangle on bottom, what are the 3 vertices?
for(int i=0; i<numSides; i++)
{
indices[indicesIndex++] = 0; // center point
indices[indicesIndex++] = i+1;
if(i+2 >= numSides+1)
indices[indicesIndex++] = 1;
else
indices[indicesIndex++] = i+2;
}
int verticesIndexTopStart = verticesIndex;
// Bottom middle
vertices[verticesIndex++] = 0;
vertices[verticesIndex++] = .5;
vertices[verticesIndex++] = -0;
normals[normalsIndex++] = 0;
normals[normalsIndex++] = 1;
normals[normalsIndex++] = 0;
texcoords[texcoordsIndex++] = 1;
texcoords[texcoordsIndex++] = 1;
// For each vertex around bottom perimeter
for(int i=0; i<numSides; i++)
{
vertices[verticesIndex++] = .5*sin(i*2*M_PI/numSides);
vertices[verticesIndex++] = .5;
vertices[verticesIndex++] = .5*cos(i*2*M_PI/numSides);
normals[normalsIndex++] = 0;
normals[normalsIndex++] = 1;
normals[normalsIndex++] = 0;
texcoords[texcoordsIndex++] = 1;
texcoords[texcoordsIndex++] = 1;
}
// For each face/triangle on bottom
for(int i=0; i<numSides; i++)
{
indices[indicesIndex++] = verticesIndexTopStart/3; // center point
indices[indicesIndex++] = verticesIndexTopStart/3+i+1;
if(i+2 >= numSides+1)
indices[indicesIndex++] = verticesIndexTopStart/3+1;
else
indices[indicesIndex++] = verticesIndexTopStart/3+i+2;
}
// For each vertex on faces on the sides of the cylinder
for(int i=0; i<numSides; i++)
{
vertices[verticesIndex++] = .5*sin(i*2*M_PI/numSides);
vertices[verticesIndex++] = .5;
vertices[verticesIndex++] = .5*cos(i*2*M_PI/numSides);
vertices[verticesIndex++] = .5*sin(i*2*M_PI/numSides);
vertices[verticesIndex++] = -.5;
vertices[verticesIndex++] = .5*cos(i*2*M_PI/numSides);
vertices[verticesIndex++] = .5*sin((i+1)*2*M_PI/numSides);
vertices[verticesIndex++] = -.5;
vertices[verticesIndex++] = .5*cos((i+1)*2*M_PI/numSides);
vertices[verticesIndex++] = .5*sin((i+1)*2*M_PI/numSides);
vertices[verticesIndex++] = .5;
vertices[verticesIndex++] = .5*cos((i+1)*2*M_PI/numSides);
for(int j=0; j<4; j++)
{
float pt1[] = { vertices[verticesIndex-3*4+0],
vertices[verticesIndex-3*4+1],
vertices[verticesIndex-3*4+2] };
float pt2[] = { vertices[verticesIndex-3*4+3],
vertices[verticesIndex-3*4+4],
vertices[verticesIndex-3*4+5] };
float pt3[] = { vertices[verticesIndex-3*4+6],
vertices[verticesIndex-3*4+7],
vertices[verticesIndex-3*4+8] };
float v1[3],v2[3],n[3];
vec3f_sub_new(v1, pt2,pt1);
vec3f_sub_new(v2, pt3,pt1);
vec3f_cross_new(n, v1, v2);
normals[normalsIndex++] = n[0];
normals[normalsIndex++] = n[1];
normals[normalsIndex++] = n[2];
if(j < 2)
texcoords[texcoordsIndex++] = (numSides-i)/(float)numSides;
else
texcoords[texcoordsIndex++] = (numSides-(i+1))/(float)numSides;
if(j == 1 || j == 2)
texcoords[texcoordsIndex++] = 0; // bottom
else
texcoords[texcoordsIndex++] = 1; // top
}
indices[indicesIndex++] = verticesIndex/3-4;
indices[indicesIndex++] = verticesIndex/3-3;
indices[indicesIndex++] = verticesIndex/3-2;
indices[indicesIndex++] = verticesIndex/3-4;
indices[indicesIndex++] = verticesIndex/3-2;
indices[indicesIndex++] = verticesIndex/3-1;
}
kuhl_geometry_new(cyl, prog, verticesIndex/3, GL_TRIANGLES);
kuhl_geometry_attrib(cyl, vertices, 3, "in_Position", 1);
kuhl_geometry_attrib(cyl, normals, 3, "in_Normal", 1);
kuhl_geometry_attrib(cyl, texcoords, 2, "in_TexCoord", 1);
kuhl_geometry_indices(cyl, indices, indicesIndex);
/*
printf("v: %d\n", verticesIndex);
printf("n: %d\n", normalsIndex);
printf("t: %d\n", texcoordsIndex);
printf("i: %d\n", indicesIndex);
*/
}
