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openglssurface.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/openglssurface.h"
00024 
00025 #include "engines/stark/gfx/opengls.h"
00026 #include "engines/stark/gfx/texture.h"
00027 
00028 #include "graphics/opengl/shader.h"
00029 
00030 namespace Stark {
00031 namespace Gfx {
00032 
00033 OpenGLSSurfaceRenderer::OpenGLSSurfaceRenderer(OpenGLSDriver *gfx) :
00034         SurfaceRenderer(),
00035         _gfx(gfx) {
00036     _shader = _gfx->createSurfaceShaderInstance();
00037 }
00038 
00039 OpenGLSSurfaceRenderer::~OpenGLSSurfaceRenderer() {
00040     delete _shader;
00041 }
00042 
00043 void OpenGLSSurfaceRenderer::render(const Texture *texture, const Common::Point &dest) {
00044     render(texture, dest, texture->width(), texture->height());
00045 }
00046 
00047 void OpenGLSSurfaceRenderer::render(const Texture *texture, const Common::Point &dest, uint width, uint height) {
00048     // Destination rectangle with given width and height
00049     const float sLeft = dest.x;
00050     const float sTop = dest.y;
00051 
00052     _gfx->start2DMode();
00053 
00054     _shader->use();
00055     _shader->setUniform1f("fadeLevel", _fadeLevel);
00056     _shader->setUniform("verOffsetXY", normalizeOriginalCoordinates(sLeft, sTop));
00057     if (_noScalingOverride) {
00058         _shader->setUniform("verSizeWH", normalizeCurrentCoordinates(width, height));
00059     } else {
00060         _shader->setUniform("verSizeWH", normalizeOriginalCoordinates(width, height));
00061     }
00062 
00063     texture->bind();
00064     glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
00065 
00066     _shader->unbind();
00067     _gfx->end2DMode();
00068 }
00069 
00070 Math::Vector2d OpenGLSSurfaceRenderer::normalizeOriginalCoordinates(float x, float y) const {
00071     Common::Rect viewport = _gfx->getUnscaledViewport();
00072     return Math::Vector2d(x / (float)viewport.width(), y / (float)viewport.height());
00073 }
00074 
00075 Math::Vector2d OpenGLSSurfaceRenderer::normalizeCurrentCoordinates(float x, float y) const {
00076     Common::Rect viewport = _gfx->getViewport();
00077     return Math::Vector2d(x / (float)viewport.width(), y / (float)viewport.height());
00078 }
00079 
00080 } // End of namespace Gfx
00081 } // End of namespace Stark


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