d6d3e17d53
Formerly, we required that the OpenGL mode was fixed at compile time. Now we allow the code to work with whatever it is given at runtime. It is still possible to force a context type on compile time.
80 lines
2.3 KiB
C++
80 lines
2.3 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "backends/graphics/opengl/opengl-sys.h"
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#include "backends/graphics/opengl/opengl-graphics.h"
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#include "common/tokenizer.h"
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namespace OpenGL {
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void Context::reset() {
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ready = false;
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type = kContextGL;
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NPOTSupported = false;
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}
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Context g_context;
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void OpenGLGraphicsManager::initializeGLContext(ContextType type) {
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// Initialize default state.
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g_context.reset();
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#if USE_FORCED_GL
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type = kContextGL;
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#elif USE_FORCED_GLES
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type = kContextGLES;
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#endif
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// Load all functions.
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// We use horrible trickery to silence C++ compilers.
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// See backends/plugins/sdl/sdl-provider.cpp for more information.
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assert(sizeof(void (*)()) == sizeof(void *));
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void *fn = nullptr;
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#define GL_EXT_FUNC_DEF(ret, name, param) \
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fn = getProcAddress(#name); \
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memcpy(&g_context.name, &fn, sizeof(fn))
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#ifdef USE_BUILTIN_OPENGL
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#define GL_FUNC_DEF(ret, name, param) g_context.name = &name
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#else
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#define GL_FUNC_DEF GL_EXT_FUNC_DEF
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#endif
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#include "backends/graphics/opengl/opengl-func.h"
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#undef GL_EXT_FUNC_DEF
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#undef GL_FUNC_DEF
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const char *extString = (const char *)g_context.glGetString(GL_EXTENSIONS);
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Common::StringTokenizer tokenizer(extString, " ");
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while (!tokenizer.empty()) {
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Common::String token = tokenizer.nextToken();
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if (token == "GL_ARB_texture_non_power_of_two") {
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g_context.NPOTSupported = true;
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}
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}
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g_context.ready = true;
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g_context.type = type;
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}
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} // End of namespace OpenGL
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