1 /* ResidualVM - A 3D game interpreter 2 * 3 * ResidualVM is the legal property of its developers, whose names 4 * are too numerous to list here. Please refer to the COPYRIGHT 5 * file distributed with this source distribution. 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 2 10 * of the License, or (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 20 * 21 */ 22 23 #ifndef GRAPHICS_OPENGL_CONTEXT_H 24 #define GRAPHICS_OPENGL_CONTEXT_H 25 26 #include "common/singleton.h" 27 28 namespace OpenGL { 29 30 enum ContextType { 31 kContextGL, 32 kContextGLES2 33 }; 34 35 /** 36 * Description structure of the OpenGL (ES) context. 37 * 38 * This class is based on LordHoto's OpenGL backend for ScummVM 39 */ 40 class Context : public Common::Singleton<Context> { 41 public: 42 Context(); 43 44 /** 45 * Initialize the context description from currently active context. 46 * 47 * The extensions and features are marked as available according 48 * to the current context capabilities. 49 */ 50 void initialize(ContextType contextType); 51 52 /** 53 * Reset context. 54 * 55 * This marks all extensions as unavailable. 56 */ 57 void reset(); 58 59 /** The type of the active context. */ 60 ContextType type; 61 62 /** The maximum texture size supported by the context. */ 63 int maxTextureSize; 64 65 /** Whether GL_ARB_texture_non_power_of_two is available or not. */ 66 bool NPOTSupported; 67 68 /** Whether shader support is available or not. */ 69 bool shadersSupported; 70 71 /** Whether FBO support is available or not. */ 72 bool framebufferObjectSupported; 73 74 /** Whether multisample FBO support is available or not */ 75 bool framebufferObjectMultisampleSupported; 76 77 /** 78 * Contains the maximum number of supported multisample samples 79 * if multisample FBOs are supported. Contains -1 otherwise. 80 */ 81 int multisampleMaxSamples; 82 83 /** Whether packing the depth and stencil buffers is possible or not. */ 84 bool packedDepthStencilSupported; 85 86 /** Whether specifying a pitch when uploading to textures is available or not */ 87 bool unpackSubImageSupported; 88 89 int getGLSLVersion() const; 90 }; 91 92 } // End of namespace OpenGL 93 94 /** Shortcut for accessing the active OpenGL context. */ 95 #define OpenGLContext OpenGL::Context::instance() 96 97 #endif 98