looking-glass/client/renderers/EGL/draw.c
2022-01-05 19:42:46 +11:00

69 lines
2 KiB
C

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