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nuclear@12
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1 /*
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2 Printblobs - halftoning display hack
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3 Copyright (C) 2013 John Tsiombikas <nuclear@member.fsf.org>
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation, either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>.
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17 */
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18 #include "opengl.h"
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19 #include "post.h"
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20
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21 void overlay(float r, float g, float b, float a)
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22 {
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23 glPushAttrib(GL_ENABLE_BIT);
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24 glDisable(GL_DEPTH_TEST);
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25 glDisable(GL_LIGHTING);
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26
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27 glMatrixMode(GL_MODELVIEW);
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28 glPushMatrix();
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29 glLoadIdentity();
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30 glMatrixMode(GL_PROJECTION);
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31 glPushMatrix();
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32 glLoadIdentity();
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33
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34 glBegin(GL_QUADS);
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35 glColor4f(r, g, b, a);
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36 glTexCoord2f(0, 0); glVertex2f(-1, -1);
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37 glTexCoord2f(1, 0); glVertex2f(1, -1);
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38 glTexCoord2f(1, 1); glVertex2f(1, 1);
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39 glTexCoord2f(0, 1); glVertex2f(-1, 1);
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40 glEnd();
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41
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42 glPopMatrix();
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43 glMatrixMode(GL_MODELVIEW);
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44 glPopMatrix();
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45
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46 glPopAttrib();
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47 }
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