opengl_gui_graphics.cpp

/***************************************************************************
 *   Copyright (C) 2005-2011 by the FIFE team                              *
 *   http://www.fifengine.net                                              *
 *   This file is part of FIFE.                                            *
 *                                                                         *
 *   FIFE is free software; you can redistribute it and/or                 *
 *   modify it under the terms of the GNU Lesser General Public            *
 *   License as published by the Free Software Foundation; either          *
 *   version 2.1 of the License, or (at your option) any later version.    *
 *                                                                         *
 *   This library 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     *
 *   Lesser General Public License for more details.                       *
 *                                                                         *
 *   You should have received a copy of the GNU Lesser General Public      *
 *   License along with this library; if not, write to the                 *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA          *
 ***************************************************************************/

// Standard C++ library includes

// This needs to be here, before guichan includes gl.h
#include "video/opengl/fife_opengl.h"

// 3rd party library includes
#include <guichan/opengl.hpp>
#include <guichan/font.hpp>


// FIFE includes
// These includes are split up in two parts, separated by one empty line
// First block: files included from the FIFE root src dir
#include "util/log/logger.h"
#include "util/base/exception.h"
#include "gui/guichan/base/gui_image.h"
#include "util/structures/rect.h"
#include "video/image.h"
#include "video/imagemanager.h"
#include "video/opengl/renderbackendopengl.h"

#include "opengl_gui_graphics.h"

namespace FIFE {
    static Logger _log(LM_GUI);

    OpenGLGuiGraphics::OpenGLGuiGraphics() {
        SDL_Surface* target = SDL_GetVideoSurface();
        assert(target);
        setTargetPlane(target->w, target->h);
        mColor = gcn::Color(255, 255, 255, 255);
        m_renderbackend = static_cast<RenderBackendOpenGL*>(RenderBackend::instance());
    }

    void OpenGLGuiGraphics::drawImage(const gcn::Image* image, int32_t srcX, int32_t srcY, int32_t dstX, int32_t dstY, int32_t width, int32_t height) {
        const GuiImage* g_img = dynamic_cast<const GuiImage*>(image);
        assert(g_img);

        ImagePtr fifeimg = g_img->getFIFEImage();
        const gcn::ClipRectangle& clip = mClipStack.top();
        fifeimg->render(Rect(dstX + clip.xOffset, dstY + clip.yOffset,
            width, height));
    }

    void OpenGLGuiGraphics::drawText(const std::string& text, int32_t x, int32_t y,
            uint32_t alignment) {
        if (mFont == NULL)
        {
            throw GuiException("OpenGLGuiGraphics::drawText() - No font set!");
        }

        switch (alignment)
        {
            case LEFT:
                mFont->drawString(this, text, x, y);
                break;
            case CENTER:
                mFont->drawString(this, text, x - mFont->getWidth(text) / 2, y);
                break;
            case RIGHT:
                mFont->drawString(this, text, x - mFont->getWidth(text), y);
                break;
            default:
                FL_WARN(_log, LMsg("OpenGLGuiGraphics::drawText() - ") << "Unknown alignment: " << alignment);
                mFont->drawString(this, text, x, y);
        }
    }

    void OpenGLGuiGraphics::drawPoint(int32_t x, int32_t y) {
        const gcn::ClipRectangle& top = mClipStack.top();
        m_renderbackend->putPixel(x + top.xOffset, y + top.yOffset, 
            mColor.r, mColor.g, mColor.b, mColor.a);
    }

    void OpenGLGuiGraphics::drawLine(int32_t x1, int32_t y1, int32_t x2, int32_t y2) {
        const gcn::ClipRectangle& top = mClipStack.top();
        x1 += top.xOffset;
        x2 += top.xOffset;
        y1 += top.yOffset;
        y2 += top.yOffset;

        Point pbegin(static_cast<int32_t>(ceil(x1 + 0.375f)), static_cast<int32_t>(ceil(y1 + 0.375f)));
        Point pend(static_cast<int32_t>(ceil(x2 + 0.625f)), static_cast<int32_t>(ceil(y2 + 0.625f)));

        m_renderbackend->drawLine(pbegin, pend,
            mColor.r, mColor.g, mColor.b, mColor.a);
        m_renderbackend->putPixel(pbegin.x, pbegin.y,
            mColor.r, mColor.g, mColor.b, mColor.a);
        m_renderbackend->putPixel(pend.x, pend.y,
            mColor.r, mColor.g, mColor.b, mColor.a);
    }

    void OpenGLGuiGraphics::drawRectangle(const gcn::Rectangle& rectangle) {
        const gcn::ClipRectangle& top = mClipStack.top();
        m_renderbackend->drawRectangle(
            Point(rectangle.x + top.xOffset, rectangle.y + top.yOffset),
            rectangle.width, rectangle.height,
            mColor.r, mColor.g, mColor.b, mColor.a);
    }

    void OpenGLGuiGraphics::fillRectangle(const gcn::Rectangle& rectangle) {
        const gcn::ClipRectangle& top = mClipStack.top();
        m_renderbackend->fillRectangle(
            Point(rectangle.x + top.xOffset, rectangle.y + top.yOffset),
            rectangle.width, rectangle.height,
            mColor.r, mColor.g, mColor.b, mColor.a);
    }

    void OpenGLGuiGraphics::_beginDraw() {
        gcn::Rectangle area(0, 0, mWidth, mHeight);
        gcn::Graphics::pushClipArea(area);
        m_renderbackend->pushClipArea(Rect(0, 0, mWidth, mHeight), false);
    }

    void OpenGLGuiGraphics::_endDraw() {
        m_renderbackend->renderVertexArrays();

        // Cleanup
        gcn::Graphics::popClipArea();
        m_renderbackend->popClipArea();
    }

    bool OpenGLGuiGraphics::pushClipArea(gcn::Rectangle area) {
        // Render what we gathered so far
        m_renderbackend->renderVertexArrays();
        gcn::Graphics::pushClipArea(area);

        // Due to some odd conception in guiChan some of area
        // has xOffset and yOffset > 0. And if it happens we 
        // need to offset our clip area. Or we can use guichan stack.
        const gcn::ClipRectangle& top = mClipStack.top();

        m_renderbackend->pushClipArea(
            Rect(top.x, top.y, top.width, top.height), false);

        return true;
    }

    void OpenGLGuiGraphics::popClipArea() {
        // Render what we gathered so far
        m_renderbackend->renderVertexArrays();
        gcn::Graphics::popClipArea();
        m_renderbackend->popClipArea();
    }

    void OpenGLGuiGraphics::setColor(const gcn::Color& color) {
        mColor = color;
    }
}