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annotate mde/gl/texture.d @ 55:f3d8c0441408

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Implemented gl.texture (without testing) & fixed log options adjusted previously. Implemented gl.texture module to load textures from file (untested). Fixed log level/option setting in Init.
author Diggory Hardy <diggory.hardy@gmail.com>
date Tue, 10 Jun 2008 17:35:13 +0100
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children 960206198cbd
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55
f3d8c0441408 Implemented gl.texture (without testing) & fixed log options adjusted previously.
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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 /** Simple module for loading images.
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17 */
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18 module mde.resource.image;
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19
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20 import mde.resource.exception;
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21
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22 import tango.std.stringz;
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23
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24 import derelict.sdl.sdl;
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25 import derelict.sdl.image;
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26 import derelict.opengl.gl;
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27
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28 /// The usual texture....
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29 alias Texture!(GL_TEXTURE_2D) Texture2D;
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30
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31 /** Represents a texture. */
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32 class Texture(TARGET)
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33 {
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34 static assert (TARGET == GL_TEXTURE_1D ||
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35 TARGET == GL_TEXTURE_2D ||
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36 TARGET == GL_TEXTURE_3D ||
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37 TARGET == GL_TEXTURE_CUBE_MAP);
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38
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39 /** Create a new Texture.
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40 *
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41 * The Texture is not associated with an OpenGL texture name until load is called.
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42 *
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43 * Params:
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44 * components = The number of components per pixel, 3 (RGB) or 4 (RGBA), or 0 in which case
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45 * components is derived from the image loaded.
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46 */
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47 this (ubyte components) {
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48 components_ = components;
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49 }
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50 /// Free the texture ID.
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51 ~this () {
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52 glDeleteTextures(1, &texID);
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53 }
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54
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55 /// Bind as current opengl texture.
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56 void bind () {
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57 assert (texID != 0, "No texture loaded yet!");
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58 glBindTexture (TARGET, texID);
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59 }
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60
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61 /// Load from a file
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62 void load (char[] file) {
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63 static assert (TARGET == GL_TEXTURE_2D); // no other support
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64
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65 assert (texID == 0, "Texture already loaded.");
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66 glGenTextures (1, &texID);
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67 bind;
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68
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69 SDL_Surface* image;
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70 image = IMG_Load (toStringz(file));
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71 if (image is null)
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72 throw new ImageException ("Unable to load "~file);
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73 // SDL_Surfaces sometimes need locking... really just for spec compliance:
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74 assert (!SDL_MUSTLOCK(image), "Didn't expect to have to lock a surface loaded from a file; no locks used!");
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75
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76 GLenum format;
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77 if (image.format.BytesPerPixel == 3)
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78 format = GL_RGB;
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79 else if (image.format.BytesPerPixel == 4)
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80 format = GL_RGBA;
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81 else
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82 throw new ImageException ("Only 8-bit-per-channel RGB/RGBA images are supported");
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83
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84 // Assume format is RGB(A); i.e. don't bother checking what
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85 // image.format.[RGBA]mask/shift/loss are.
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86
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87 if (components_ == 0)
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88 components_ = image.format.BytesPerPixel;
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89
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90 if (image.pitch != image.w)
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91 throw new ImageException ("pitch != width; this is unsupported");
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92
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93 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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94 glPixelStorei (GL_UNPACK_ROW_LENGTH, 0);
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95 glTexImage2D(TARGET, 0, components_,
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96 w, h, 0,
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97 format, GL_UNSIGNED_BYTE, image.pixels);
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98
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99 SDL_FreeSurface (image);
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100 }
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101
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102 int width () { return w; }
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103 int height () { return h; }
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104 /// 3 for RGB, 4 for RGBA, 0 if no image loaded and format will be derived from the image.
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105 ubyte components () { return components_; }
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106
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107 private {
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108 int w, h; // size
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109 ubyte components_ = 0; // 3 for RGB, 4 for RGBA
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110 uint texID = 0;
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111 }
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112 }
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113