// makes a unit width and length robot
static void vxo_robot_init()
{
float verts_f[NVERTS*2] = { -DEFAULT_LENGTH/2, DEFAULT_WIDTH/2,
-DEFAULT_LENGTH/2, -DEFAULT_WIDTH/2,
DEFAULT_LENGTH/2, 0.0f
};
points = vx_resc_copyf(verts_f, NVERTS*2);
vx_resc_inc_ref(points); // hold on to these forever
}
static void vxo_rect_init()
{
float verts_f[NVERTS*2] = {-0.5f,-0.5f,
0.5f,-0.5f,
0.5f, 0.5f,
-0.5f, 0.5f};
uint32_t ind_i[NIDX] = {0,1,2,2,3,0};
float norms_f[NVERTS*3] = {0,0,1,
0,0,1,
0,0,1,
0,0,1};
points = vx_resc_copyf(verts_f, NVERTS*2);
normals = vx_resc_copyf(norms_f, NVERTS*3);
indices = vx_resc_copyui(ind_i, NIDX);
vx_resc_inc_ref(points); // hold on to these references until vx_global_destroy()
vx_resc_inc_ref(indices);
vx_resc_inc_ref(normals);
}
static void vxo_grid_init(int npts)
{
// each iteration we make 2 points, along 2 axis in 2D, so stride = 8
float all_lines[npts*8];
for (int i = 0; i < npts/2; i++) {
float x = i;
float y = npts/2;
// Vertical lines
all_lines[ 16 * i + 0] = x;
all_lines[ 16 * i + 1] = y;
all_lines[ 16 * i + 2] = x;
all_lines[ 16 * i + 3] = -y;
all_lines[ 16 * i + 4] = -x;
all_lines[ 16 * i + 5] = y;
all_lines[ 16 * i + 6] = -x;
all_lines[ 16 * i + 7] = -y;
// Horizontal lines (swap assignment of x->y)
all_lines[ 16 * i + 8] = y;
all_lines[ 16 * i + 9] = x;
all_lines[ 16 * i + 10] = -y;
all_lines[ 16 * i + 11] = x;
all_lines[ 16 * i + 12] = y;
all_lines[ 16 * i + 13] = -x;
all_lines[ 16 * i + 14] = -y;
all_lines[ 16 * i + 15] = -x;
}
grid_vertices = vx_resc_copyf(all_lines, npts*8);
vx_resc_inc_ref(grid_vertices);
}
static void vxo_box_init()
{
// for GL_POINTS
float point_verts[NVERTS*3] =
{
-0.5f,-0.5f,-0.5f, // 0
-0.5f,+0.5f,-0.5f, // 1
+0.5f,+0.5f,-0.5f, // 2
+0.5f,-0.5f,-0.5f, // 3
-0.5f,-0.5f,+0.5f, // 4
-0.5f,+0.5f,+0.5f, // 5
+0.5f,+0.5f,+0.5f, // 6
+0.5f,-0.5f,+0.5f, // 7
};
// for GL_LINES
uint32_t line_idxs[N_LINE_IDX*2] =
{
0,1, 1,2, 2,3, 3,0, // bottom
4,5, 5,6, 6,7, 7,4, // top
0,4, 1,5, 2,6, 3,7 // sides
};
// for GL_TRIANGLES
// Note: we could reduce the amount of vertex data
// by using indices -- e.g. point 0 and 2 are listed twice with the
// same normal on the bottom face (would save us 16 vertices out of 48)
// each vertex is listed 6 times, has 3 coords
float tri_verts[N_TRI_VERT*3] =
{
// Bottom Face
+0.5f,+0.5f,-0.5f, // 2
-0.5f,-0.5f,-0.5f, // 0
-0.5f,+0.5f,-0.5f, // 1
-0.5f,-0.5f,-0.5f, // 0
+0.5f,+0.5f,-0.5f, // 2
+0.5f,-0.5f,-0.5f, // 3
// Top
-0.5f,+0.5f,+0.5f, // 5
-0.5f,-0.5f,+0.5f, // 4
+0.5f,+0.5f,+0.5f, // 6
+0.5f,+0.5f,+0.5f, // 6
-0.5f,-0.5f,+0.5f, // 4
+0.5f,-0.5f,+0.5f, // 7
// Front
+0.5f,+0.5f,+0.5f, // 6
+0.5f,-0.5f,+0.5f, // 7
+0.5f,-0.5f,-0.5f, // 3
+0.5f,+0.5f,+0.5f, // 6
+0.5f,-0.5f,-0.5f, // 3
+0.5f,+0.5f,-0.5f, // 2
// Back
-0.5f,-0.5f,+0.5f, // 4
-0.5f,+0.5f,+0.5f, // 5
-0.5f,+0.5f,-0.5f, // 1
-0.5f,-0.5f,+0.5f, // 4
-0.5f,+0.5f,-0.5f, // 1
-0.5f,-0.5f,-0.5f, // 0
// Right
+0.5f,-0.5f,+0.5f, // 7
-0.5f,-0.5f,+0.5f, // 4
-0.5f,-0.5f,-0.5f, // 0
+0.5f,-0.5f,+0.5f, // 7
-0.5f,-0.5f,-0.5f, // 0
+0.5f,-0.5f,-0.5f, // 3
// Left
-0.5f,+0.5f,+0.5f, // 5
+0.5f,+0.5f,+0.5f, // 6
+0.5f,+0.5f,-0.5f, // 2
-0.5f,+0.5f,+0.5f, // 5
+0.5f,+0.5f,-0.5f, // 2
-0.5f,+0.5f,-0.5f, // 1
};
float tri_norms[N_TRI_VERT*3] =
{
// Bottom
+0.0f,+0.0f,-1.0f,
+0.0f,+0.0f,-1.0f,
+0.0f,+0.0f,-1.0f,
+0.0f,+0.0f,-1.0f,
+0.0f,+0.0f,-1.0f,
+0.0f,+0.0f,-1.0f,
// Top
+0.0f,+0.0f,+1.0f,
+0.0f,+0.0f,+1.0f,
+0.0f,+0.0f,+1.0f,
+0.0f,+0.0f,+1.0f,
+0.0f,+0.0f,+1.0f,
+0.0f,+0.0f,+1.0f,
// Front
+1.0f,+0.0f,+0.0f,
+1.0f,+0.0f,+0.0f,
+1.0f,+0.0f,+0.0f,
+1.0f,+0.0f,+0.0f,
+1.0f,+0.0f,+0.0f,
+1.0f,+0.0f,+0.0f,
// Back
-1.0f,+0.0f,+0.0f,
-1.0f,+0.0f,+0.0f,
-1.0f,+0.0f,+0.0f,
-1.0f,+0.0f,+0.0f,
-1.0f,+0.0f,+0.0f,
-1.0f,+0.0f,+0.0f,
// Right
+0.0f,-1.0f,+0.0f,
+0.0f,-1.0f,+0.0f,
+0.0f,-1.0f,+0.0f,
+0.0f,-1.0f,+0.0f,
+0.0f,-1.0f,+0.0f,
+0.0f,-1.0f,+0.0f,
// Left
+0.0f,+1.0f,+0.0f,
+0.0f,+1.0f,+0.0f,
+0.0f,+1.0f,+0.0f,
+0.0f,+1.0f,+0.0f,
+0.0f,+1.0f,+0.0f,
+0.0f,+1.0f,+0.0f
};
// triangles in CCW when viewed from outside the box
/*
2,0,1,0,2,3, // bottom face
5,4,6,6,4,7, // top face
6,7,3,6,3,2, // front face
4,5,1,4,1,0, // back face
7,4,0,7,0,3, // right face
5,6,2,5,2,1 // left face
*/
vertex_points = vx_resc_copyf(point_verts, NVERTS*3);
line_indices = vx_resc_copyui(line_idxs, N_LINE_IDX*2);
tri_points = vx_resc_copyf(tri_verts, N_TRI_VERT*3);
tri_normals = vx_resc_copyf(tri_norms, N_TRI_VERT*3);
// hold on to these references until vx_global_destroy()
vx_resc_inc_ref(vertex_points);
vx_resc_inc_ref(line_indices);
vx_resc_inc_ref(tri_points);
vx_resc_inc_ref(tri_normals);
}
