LookingGlass/client/renderers/egl/draw.c

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/*
Looking Glass - KVM FrameRelay (KVMFR) Client
Copyright (C) 2017 Geoffrey McRae <geoff@hostfission.com>
https://looking-glass.hostfission.com
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_draw_torus(EGL_Model * model, unsigned int pts, float x, float y, float inner, float outer)
{
GLfloat * v = (GLfloat *)malloc(sizeof(GLfloat) * (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;
*dst = y + (inner * s); ++dst;
*dst = 0.0f; ++dst;
*dst = x + (outer * c); ++dst;
*dst = y + (outer * s); ++dst;
*dst = 0.0f; ++dst;
}
egl_model_add_verticies(model, v, NULL, (pts + 1) * 2);
free(v);
}
void egl_draw_torus_arc(EGL_Model * model, unsigned int pts, float x, float y, float inner, float outer, float s, float e)
{
GLfloat * v = (GLfloat *)malloc(sizeof(GLfloat) * (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;
*dst = y + (inner * s); ++dst;
*dst = 0.0f; ++dst;
*dst = x + (outer * c); ++dst;
*dst = y + (outer * s); ++dst;
*dst = 0.0f; ++dst;
}
egl_model_add_verticies(model, v, NULL, (pts + 1) * 2);
free(v);
}