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annotate mde/gl/basic.d @ 48:a98ffb64f066

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Implemented font rendering (grayscale only; i.e. non-LCD). FontTexture creates a texture and caches glyphs. Font supports multiple styles/faces, loaded from config file (should probably be loaded via Options instead). TextBlock cache for glyph placement within a string. committer: Diggory Hardy <diggory.hardy@gmail.com>
author Diggory Hardy <diggory.hardy@gmail.com>
date Sat, 31 May 2008 12:40:26 +0100
parents 0fd51d2c6c8a
children 9e1f05fbbcef
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1 /* LICENSE BLOCK
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2 Part of mde: a Modular D game-oriented Engine
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3 Copyright © 2007-2008 Diggory Hardy
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4
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5 This program is free software: you can redistribute it and/or modify it under the terms
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6 of the GNU General Public License as published by the Free Software Foundation, either
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7 version 2 of the License, or (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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10 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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11 See the GNU General Public License for more details.
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12
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13 You should have received a copy of the GNU General Public License
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14 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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15
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16 /** Some basic OpenGL code for setting up a projection and drawing.
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17 *
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18 * Everything here is really intended as makeshift code to enable GUI development. */
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19 module mde.gl.basic;
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21 import derelict.opengl.gl;
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23 import tango.time.Time; // TimeSpan (type only; unused)
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25 //BEGIN GL & window setup
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26 void glSetup () {
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27 glDisable(GL_DEPTH_TEST);
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28 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
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29 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
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30 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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31 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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32 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
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33 glEnable(GL_TEXTURE_2D);
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34 glShadeModel(GL_FLAT);
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36 glClearColor (0.0f, 0.0f, 0.0f, 0.0f);
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38 glMatrixMode(GL_MODELVIEW);
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39 glLoadIdentity();
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41 // Used for font rendering:
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42 glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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43 glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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44 //NOTE: wrap mode may have an effect, but shouldn't be noticed...
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45 }
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46
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47 void setProjection (int w, int h) {
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48 glMatrixMode (GL_PROJECTION);
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49 glLoadIdentity ();
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51 glViewport (0,0,w,h);
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53 // Make the top-left the origin (see gui/GUI notes.txt):
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54 // Note that this only affects vertex operations − direct rasterisation operations are
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55 // unaffected!
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56 glOrtho (0.0,w, h,0.0, -1.0, 1.0);
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58 glMatrixMode(GL_MODELVIEW);
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59 }
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60 //END GL & window setup
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62 //BEGIN Drawing utils
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63 // Simple drawing commands for use by GUI
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64 // (temporary)
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65 void setColor (float r, float g, float b) {
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66 glColor3f (r, g, b);
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67 }
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68 void drawBox (int x, int y, int w, int h) {
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69 glDisable(GL_TEXTURE_2D);
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70 glRecti(x, y+h, x+w, y);
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71 }
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72 //END Drawing utils