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openglsfade.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 AUTHORS
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 "engines/stark/gfx/openglsfade.h"
00024 
00025 #include "engines/stark/gfx/opengls.h"
00026 
00027 #include "graphics/opengl/shader.h"
00028 
00029 namespace Stark {
00030 namespace Gfx {
00031 
00032 OpenGLSFadeRenderer::OpenGLSFadeRenderer(OpenGLSDriver *gfx) :
00033     FadeRenderer(),
00034     _gfx(gfx) {
00035     _shader = _gfx->createFadeShaderInstance();
00036 }
00037 
00038 OpenGLSFadeRenderer::~OpenGLSFadeRenderer() {
00039     delete _shader;
00040 }
00041 
00042 void OpenGLSFadeRenderer::render(float fadeLevel) {
00043     _gfx->start2DMode();
00044 
00045     _shader->use();
00046     _shader->setUniform1f("alphaLevel", 1.0 - fadeLevel);
00047     glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
00048     _shader->unbind();
00049 
00050     _gfx->end2DMode();
00051 }
00052 
00053 } // End of namespace Gfx
00054 } // End of namespace Stark


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