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compat_shaders.cpp

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00001 /* ResidualVM - A 3D game interpreter
00002  *
00003  * ResidualVM is the legal property of its developers, whose names
00004  * are too numerous to list here. Please refer to the COPYRIGHT
00005  * file distributed with this source distribution.
00006  *
00007  * This program is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU General Public License
00009  * as published by the Free Software Foundation; either version 2
00010  * of the License, or (at your option) any later version.
00011  *
00012  * This program is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with this program; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
00020  *
00021  */
00022 
00023 #include "common/scummsys.h"
00024 
00025 #if defined(USE_GLES2) || defined(USE_OPENGL_SHADERS)
00026 
00027 namespace OpenGL {
00028 namespace BuiltinShaders {
00029 
00030 const char *compatVertex =
00031     "#if defined(GL_ES)\n"
00032         "mediump float round(in mediump float x) {\n"
00033             "return sign(x) * floor(abs(x) + .5);\n"
00034         "}\n"
00035         "#define in attribute\n"
00036         "#define out varying\n"
00037     "#elif __VERSION__ < 130\n"
00038         "float round(in float x) {\n"
00039         "return sign(x) * floor(abs(x) + .5);\n"
00040         "}\n"
00041         "#define highp\n"
00042         "#define in attribute\n"
00043         "#define out varying\n"
00044     "#endif\n";
00045 
00046 const char *compatFragment =
00047     "#if defined(GL_ES)\n"
00048         "#define in varying\n"
00049         "#ifdef GL_FRAGMENT_PRECISION_HIGH\n"
00050             "precision highp float;\n"
00051         "#else\n"
00052             "precision mediump float;\n"
00053         "#endif\n"
00054         "#define OUTPUT\n"
00055         "#define outColor gl_FragColor\n"
00056         "#define texture texture2D\n"
00057     "#elif __VERSION__ < 130\n"
00058         "#define in varying\n"
00059         "#define OUTPUT\n"
00060         "#define outColor gl_FragColor\n"
00061         "#define texture texture2D\n"
00062     "#else\n"
00063         "#define OUTPUT out vec4 outColor;\n"
00064     "#endif\n";
00065 
00066 }
00067 } // End of namespace OpenGL
00068 
00069 #endif


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