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Diffstat (limited to 'hacks/glx/sphere.c')
| -rw-r--r-- | hacks/glx/sphere.c | 141 |
1 files changed, 0 insertions, 141 deletions
diff --git a/hacks/glx/sphere.c b/hacks/glx/sphere.c deleted file mode 100644 index 0e485f2..0000000 --- a/hacks/glx/sphere.c +++ /dev/null @@ -1,141 +0,0 @@ -/* sphere, Copyright (c) 2002 Paul Bourke <pbourke@swin.edu.au>, - * Copyright (c) 2010-2014 Jamie Zawinski <jwz@jwz.org> - * Utility function to create a unit sphere in GL. - * - * Permission to use, copy, modify, distribute, and sell this software and its - * documentation for any purpose is hereby granted without fee, provided that - * the above copyright notice appear in all copies and that both that - * copyright notice and this permission notice appear in supporting - * documentation. No representations are made about the suitability of this - * software for any purpose. It is provided "as is" without express or - * implied warranty. - * - * 8-Oct-98: dek Released initial version of "glplanet" - * 21-Mar-01: jwz@jwz.org Broke sphere routine out into its own file. - * 28-Feb-02: jwz@jwz.org New implementation from Paul Bourke: - * http://astronomy.swin.edu.au/~pbourke/opengl/sphere/ - * 21-Aug-10 jwz@jwz.org Converted to use glDrawArrays, for OpenGL ES. - */ - -#include "screenhackI.h" -#include "sphere.h" - -#include <math.h> -#include <stdlib.h> - -typedef struct { GLfloat x, y, z; } XYZ; - -static int -unit_sphere_1 (int stacks, int slices, int wire_p, int half_p) -{ - int polys = 0; - int i,j; - double theta1, theta2, theta3; - XYZ p, n; - XYZ la = { 0, -1, 0 }, lb = { 0, -1, 0 }; - XYZ c = {0, 0, 0}; /* center */ - double r = 1.0; /* radius */ - int stacks2 = stacks * 2; - int end = (half_p ? stacks/2 : stacks); - - int mode = (wire_p ? GL_LINE_STRIP : GL_TRIANGLE_STRIP); - - int arraysize, out; - struct { XYZ p; XYZ n; GLfloat s, t; } *array; - - if (r < 0) - r = -r; - if (slices < 0) - slices = -slices; - - arraysize = (stacks+1) * (slices+1) * (wire_p ? 4 : 2); - array = (void *) calloc (arraysize, sizeof(*array)); - if (! array) abort(); - out = 0; - - if (slices < 4 || stacks < 2 || r <= 0) - { - mode = GL_POINTS; - array[out++].p = c; - goto END; - } - - for (j = 0; j < end; j++) - { - theta1 = j * (M_PI+M_PI) / stacks2 - M_PI_2; - theta2 = (j + 1) * (M_PI+M_PI) / stacks2 - M_PI_2; - - for (i = slices; i >= 0; i--) - { - theta3 = i * (M_PI+M_PI) / slices; - - if (wire_p) - { - array[out++].p = lb; /* vertex */ - array[out++].p = la; /* vertex */ - } - - n.x = cos (theta2) * cos(theta3); - n.y = sin (theta2); - n.z = cos (theta2) * sin(theta3); - p.x = c.x + r * n.x; - p.y = c.y + r * n.y; - p.z = c.z + r * n.z; - - array[out].p = p; /* vertex */ - array[out].n = n; /* normal */ - array[out].s = i / (GLfloat) slices; /* texture */ - array[out].t = 2*(j+1) / (GLfloat) stacks2; - out++; - - if (wire_p) la = p; - - n.x = cos(theta1) * cos(theta3); - n.y = sin(theta1); - n.z = cos(theta1) * sin(theta3); - p.x = c.x + r * n.x; - p.y = c.y + r * n.y; - p.z = c.z + r * n.z; - - array[out].p = p; /* vertex */ - array[out].n = n; /* normal */ - array[out].s = i / (GLfloat) slices; /* texture */ - array[out].t = 2*j / (GLfloat) stacks2; - out++; - - if (out >= arraysize) abort(); - - if (wire_p) lb = p; - polys++; - } - } - - END: - - glEnableClientState (GL_VERTEX_ARRAY); - glEnableClientState (GL_NORMAL_ARRAY); - glEnableClientState (GL_TEXTURE_COORD_ARRAY); - - glVertexPointer (3, GL_FLOAT, sizeof(*array), &array[0].p); - glNormalPointer ( GL_FLOAT, sizeof(*array), &array[0].n); - glTexCoordPointer (2, GL_FLOAT, sizeof(*array), &array[0].s); - - glDrawArrays (mode, 0, out); - - free (array); - - return polys; -} - - -int -unit_sphere (int stacks, int slices, int wire_p) -{ - return unit_sphere_1 (stacks, slices, wire_p, 0); -} - -int -unit_dome (int stacks, int slices, int wire_p) -{ - return unit_sphere_1 (stacks, slices, wire_p, 1); -} |