mirror of
https://github.com/gnif/LookingGlass.git
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70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
/**
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* Looking Glass
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* Copyright © 2017-2022 The Looking Glass Authors
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* https://looking-glass.io
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc., 59
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* Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "draw.h"
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#include <stdlib.h>
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#include <math.h>
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void egl_drawTorus(EGL_Model * model, unsigned int pts, float x, float y,
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float inner, float outer)
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{
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GLfloat * v = malloc(sizeof(*v) * (pts + 1) * 6);
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GLfloat * dst = v;
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for(unsigned int i = 0; i <= pts; ++i)
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{
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const float angle = (i / (float)pts) * M_PI * 2.0f;
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const float c = cos(angle);
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const float s = sin(angle);
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*dst++ = x + (inner * c);
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*dst++ = y + (inner * s);
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*dst++ = 0.0f;
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*dst++ = x + (outer * c);
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*dst++ = y + (outer * s);
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*dst++ = 0.0f;
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}
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egl_modelAddVerts(model, v, NULL, (pts + 1) * 2);
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free(v);
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}
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void egl_drawTorusArc(EGL_Model * model, unsigned int pts, float x, float y,
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float inner, float outer, float s, float e)
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{
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GLfloat * v = malloc(sizeof(*v) * (pts + 1) * 6);
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GLfloat * dst = v;
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for(unsigned int i = 0; i <= pts; ++i)
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{
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const float angle = s + ((i / (float)pts) * e);
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const float c = cos(angle);
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const float s = sin(angle);
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*dst++ = x + (inner * c);
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*dst++ = y + (inner * s);
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*dst++ = 0.0f;
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*dst++ = x + (outer * c);
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*dst++ = y + (outer * s);
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*dst++ = 0.0f;
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}
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egl_modelAddVerts(model, v, NULL, (pts + 1) * 2);
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free(v);
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}
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