mango_engine.graphics.opengl.gl

1 /*
2  *  BSD 3-Clause License
3  *  
4  *  Copyright (c) 2016, Mango-Engine Team
5  *  All rights reserved.
6  *  
7  *  Redistribution and use in source and binary forms, with or without
8  *  modification, are permitted provided that the following conditions are met:
9  *  
10  *  * Redistributions of source code must retain the above copyright notice, this
11  *    list of conditions and the following disclaimer.
12  *  
13  *  * Redistributions in binary form must reproduce the above copyright notice,
14  *    this list of conditions and the following disclaimer in the documentation
15  *    and/or other materials provided with the distribution.
16  *  
17  *  * Neither the name of the copyright holder nor the names of its
18  *    contributors may be used to endorse or promote products derived from
19  *    this software without specific prior written permission.
20  *  
21  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
22  *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24  *  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
25  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  *  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
27  *  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
28  *  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29  *  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30  *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32 module mango_engine.graphics.opengl.gl_backend;
33 
34 immutable MANGO_GL_VERSION_MAJOR = 3;
35 immutable MANGO_GL_VERSION_MINOR = 3;
36 immutable MANGO_GL_VERSION = "3.3";
37 
38 version(mango_GLBackend) {
39     import mango_engine.game;
40     import mango_engine.mango;
41     import mango_engine.logging;
42     import mango_engine.util;
43     import mango_engine.graphics.renderer;
44 
45     import derelict.opengl3.gl3;
46     import derelict.glfw3.glfw3;
47     import derelict.freeimage.freeimage;
48     import derelict.util.exception; 
49 
50     package void glbackend_loadCoreMethods() @system {
51         DerelictGL3.reload();
52     }
53 
54     class GLInitalizer : EngineInitalizer { 
55         this(Logger logger) @safe nothrow {
56             super(logger);
57         }
58 
59         private void loadLibraries() @system {
60             try {
61                 DerelictGL3.load();
62                 this.logger.logDebug("Loaded OpenGL");
63             } catch(Exception e) {
64                 throw new Exception("Failed to load library OpenGL!");
65             }
66 
67             mixin(LoadLibraryTemplate!("GLFW", "GLFW3", "glfw3"));
68             DerelictFI.missingSymbolCallback = &this.fi_missingSymbolCB;
69             mixin(LoadLibraryTemplate!("FreeImage", "FI", "FreeImage"));
70 
71             if(!glfwInit()) {
72                 throw new Exception("Failed to init GLFW (glfwInit)!");
73             }
74         }
75 
76         private ShouldThrow fi_missingSymbolCB(string symbolName) @safe {
77             version(mango_noWarnOnMissingSymbol) {
78             } else {
79                 logger.logWarn("(Minor) Missing FreeImage Symbol! " ~ symbolName);
80             }
81             return ShouldThrow.No;
82         }
83 
84         override {
85             protected GameManagerFactory doInit() @trusted {
86                 loadLibraries();
87 
88                 GameManagerFactory factory = new GameManagerFactory(BackendType.BACKEND_OPENGL);
89                 factory.setRenderer(Renderer.build());
90                 return factory;
91             }
92 
93             protected void doDestroy() @trusted {
94 
95             }
96         }
97     }
98 }