fadequad.cpp

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/* xoreos - A reimplementation of BioWare's Aurora engine
 *
 * xoreos is the legal property of its developers, whose names
 * can be found in the AUTHORS file distributed with this source
 * distribution.
 *
 * xoreos is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or (at your option) any later version.
 *
 * xoreos is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with xoreos. If not, see <http://www.gnu.org/licenses/>.
 */

#include "src/common/util.h"
#include "src/common/maths.h"

#include "src/graphics/aurora/fadequad.h"

#include "src/events/events.h"

namespace Graphics {

namespace Aurora {

FadeQuad::FadeQuad() : Renderable(kRenderableTypeGUIFront),
    _fadeType(kFadeNone), _r(1.0f), _g(0.0f), _b(0.0f),
    _opacity(0.0f), _wait(0), _run(0), _start(0) {
}

void FadeQuad::getColor(float &r, float &g, float &b) const {
    r = _r;
    g = _g;
    b = _b;
}

void FadeQuad::setColor(float r, float g, float b) {
    _r = r;
    _g = g;
    _b = b;
}

void FadeQuad::getWaitTime(float &wait) const {
    wait = _wait / 1000;
}

void FadeQuad::setWaitTime(float wait) {
    _wait = wait * 1000;
}

void FadeQuad::getRunTime(float &run) const {
    run = _run / 1000;
}

void FadeQuad::setRunTime(float run) {
    _run = run * 1000;
}

void FadeQuad::fadeIn() {
    _fadeType = kFadeIn;
    _start = EventMan.getTimestamp();
    show();
}

void FadeQuad::fadeOut() {
    _fadeType = kFadeOut;
    _start = EventMan.getTimestamp();
    show();
}

void FadeQuad::calculateDistance() {
}

void FadeQuad::render(Graphics::RenderPass pass) {
    bool isTransparent = _opacity < 1.0f;
    if (((pass == Graphics::kRenderPassOpaque     ) &&  isTransparent) ||
        ((pass == Graphics::kRenderPassTransparent) && !isTransparent))
        return;

    if (_fadeType == kFadeNone)
        return;

    uint32 time = EventMan.getTimestamp() - _start;

    if (time > _wait) {
        time = time - _wait;

        if (_run == 0.0f) {
            if (_fadeType == kFadeOut)
                _opacity = 1.0f;
            if (_fadeType == kFadeIn)
                _opacity = 0.0f;
        } else {
            if (_fadeType == kFadeOut)
                _opacity = MIN(1.0f, static_cast<float>(time) / _run);
            if (_fadeType == kFadeIn)
                _opacity = MAX(0.0f, (_run - static_cast<float>(time)) / _run);
        }
    }

    GLint viewport[4];
    glGetIntegerv(GL_VIEWPORT, viewport);

    glColor4f(_r, _g, _b, _opacity);

    float width, height;
    width = viewport[2] / 2;
    height = viewport[3] / 2;

    glBegin(GL_QUADS);
    glVertex3f(width, height, -FLT_MAX);
    glVertex3f(-width, height, -FLT_MAX);
    glVertex3f(-width, -height, -FLT_MAX);
    glVertex3f(width, -height, -FLT_MAX);
    glEnd();

    glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
}

} // End of namespace Aurora

} // End of namespace Graphics