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 AUTHORS
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 #include "engines/stark/gfx/openglsfade.h"
24
25 #include "engines/stark/gfx/opengls.h"
26
27 #if defined(USE_GLES2) || defined(USE_OPENGL_SHADERS)
28
29 #include "graphics/opengl/shader.h"
30
31 namespace Stark {
32 namespace Gfx {
33
OpenGLSFadeRenderer(OpenGLSDriver * gfx)34 OpenGLSFadeRenderer::OpenGLSFadeRenderer(OpenGLSDriver *gfx) :
35 FadeRenderer(),
36 _gfx(gfx) {
37 _shader = _gfx->createFadeShaderInstance();
38 }
39
~OpenGLSFadeRenderer()40 OpenGLSFadeRenderer::~OpenGLSFadeRenderer() {
41 delete _shader;
42 }
43
render(float fadeLevel)44 void OpenGLSFadeRenderer::render(float fadeLevel) {
45 _gfx->start2DMode();
46
47 _shader->use();
48 _shader->setUniform1f("alphaLevel", 1.0 - fadeLevel);
49 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
50 _shader->unbind();
51
52 _gfx->end2DMode();
53 }
54
55 } // End of namespace Gfx
56 } // End of namespace Stark
57
58 #endif // defined(USE_GLES2) || defined(USE_OPENGL_SHADERS)
59