Initial commit.

This code based on mana client http://www.gitorious.org/mana/mana
and my private repository.

1 files changed, 950 insertions, 0 deletions

diff --git a/src/openglgraphics.cpp b/src/openglgraphics.cpp
new file mode 100644
index 000000000..f1bfffa35
--- /dev/null
+++ b/src/openglgraphics.cpp
@@ -0,0 +1,950 @@
+/*
+ *  The Mana Client
+ *  Copyright (C) 2004-2009  The Mana World Development Team
+ *  Copyright (C) 2009-2010  The Mana Developers
+ *
+ *  This file is part of The Mana Client.
+ *
+ *  This program 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 2 of the License, or
+ *  any later version.
+ *
+ *  This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "main.h"
+
+#ifdef USE_OPENGL
+
+#include "openglgraphics.h"
+
+#include "log.h"
+
+#include "resources/image.h"
+
+#include "utils/stringutils.h"
+
+#ifdef __APPLE__
+#include <OpenGL/OpenGL.h>
+#endif
+
+#include <SDL.h>
+
+#ifndef GL_TEXTURE_RECTANGLE_ARB
+#define GL_TEXTURE_RECTANGLE_ARB 0x84F5
+#define GL_MAX_RECTANGLE_TEXTURE_SIZE_ARB 0x84F8
+#endif
+
+const unsigned int vertexBufSize = 500;
+
+GLuint OpenGLGraphics::mLastImage = 0;
+
+OpenGLGraphics::OpenGLGraphics():
+    mAlpha(false), mTexture(false), mColorAlpha(false),
+    mSync(false)
+{
+    mFloatTexArray = new GLfloat[vertexBufSize * 4 + 30];
+    mIntTexArray = new GLint[vertexBufSize * 4 + 30];
+    mIntVertArray = new GLint[vertexBufSize * 4 + 30];
+}
+
+OpenGLGraphics::~OpenGLGraphics()
+{
+    delete[] mFloatTexArray;
+    delete[] mIntTexArray;
+    delete[] mIntVertArray;
+}
+
+void OpenGLGraphics::setSync(bool sync)
+{
+    mSync = sync;
+}
+
+bool OpenGLGraphics::setVideoMode(int w, int h, int bpp, bool fs, bool hwaccel)
+{
+    logger->log("Setting video mode %dx%d %s",
+            w, h, fs ? "fullscreen" : "windowed");
+
+    int displayFlags = SDL_ANYFORMAT | SDL_OPENGL;
+
+    mWidth = w;
+    mHeight = h;
+    mBpp = bpp;
+    mFullscreen = fs;
+    mHWAccel = hwaccel;
+
+    if (fs)
+        displayFlags |= SDL_FULLSCREEN;
+
+    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
+
+    if (!(mTarget = SDL_SetVideoMode(w, h, bpp, displayFlags)))
+        return false;
+
+#ifdef __APPLE__
+    if (mSync)
+    {
+        const GLint VBL = 1;
+        CGLSetParameter(CGLGetCurrentContext(), kCGLCPSwapInterval, &VBL);
+    }
+#endif
+
+    // Setup OpenGL
+    glViewport(0, 0, w, h);
+    glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_FASTEST);
+    int gotDoubleBuffer;
+    SDL_GL_GetAttribute(SDL_GL_DOUBLEBUFFER, &gotDoubleBuffer);
+    logger->log("Using OpenGL %s double buffering.",
+                (gotDoubleBuffer ? "with" : "without"));
+
+    char const *glExtensions = (char const *)glGetString(GL_EXTENSIONS);
+    GLint texSize;
+    bool rectTex = strstr(glExtensions, "GL_ARB_texture_rectangle");
+    if (rectTex)
+    {
+        Image::mTextureType = GL_TEXTURE_RECTANGLE_ARB;
+        glGetIntegerv(GL_MAX_RECTANGLE_TEXTURE_SIZE_ARB, &texSize);
+    }
+    else
+    {
+        Image::mTextureType = GL_TEXTURE_2D;
+        glGetIntegerv(GL_MAX_TEXTURE_SIZE, &texSize);
+    }
+    Image::mTextureSize = texSize;
+    logger->log("OpenGL texture size: %d pixels%s", Image::mTextureSize,
+                rectTex ? " (rectangle textures)" : "");
+
+    return true;
+}
+
+static inline void drawQuad(Image *image,
+                            int srcX, int srcY, int dstX, int dstY,
+                            int width, int height)
+{
+    if (image->getTextureType() == GL_TEXTURE_2D)
+    {
+        // Find OpenGL normalized texture coordinates.
+        const float texX1 = static_cast<float>(srcX) /
+                            static_cast<float>(image->getTextureWidth());
+        const float texY1 = static_cast<float>(srcY) /
+                            static_cast<float>(image->getTextureHeight());
+        const float texX2 = static_cast<float>(srcX + width) /
+                            static_cast<float>(image->getTextureWidth());
+        const float texY2 = static_cast<float>(srcY + height) /
+                            static_cast<float>(image->getTextureHeight());
+
+        GLfloat tex[] =
+        {
+            texX1, texY1,
+            texX2, texY1,
+            texX2, texY2,
+            texX1, texY2
+        };
+
+        GLint vert[] =
+        {
+            dstX, dstY,
+            dstX + width, dstY,
+            dstX + width, dstY + height,
+            dstX, dstY + height
+        };
+
+        glVertexPointer(2, GL_FLOAT, 0, &vert);
+        glTexCoordPointer(2, GL_INT, 0, &tex);
+
+        glDrawArrays(GL_QUADS, 0, 4);
+    }
+    else
+    {
+        GLint tex[] =
+        {
+            srcX, srcY,
+            srcX + width, srcY,
+            srcX + width, srcY + height,
+            srcX, srcY + height
+        };
+        GLint vert[] =
+        {
+            dstX, dstY,
+            dstX + width, dstY,
+            dstX + width, dstY + height,
+            dstX, dstY + height
+        };
+
+        glVertexPointer(2, GL_INT, 0, &vert);
+        glTexCoordPointer(2, GL_INT, 0, &tex);
+
+        glDrawArrays(GL_QUADS, 0, 4);
+    }
+}
+
+static inline void drawRescaledQuad(Image *image,
+                                    int srcX, int srcY, int dstX, int dstY,
+                                    int width, int height,
+                                    int desiredWidth, int desiredHeight)
+{
+    if (image->getTextureType() == GL_TEXTURE_2D)
+    {
+        // Find OpenGL normalized texture coordinates.
+        const float texX1 = static_cast<float>(srcX) /
+                            static_cast<float>(image->getTextureWidth());
+        const float texY1 = static_cast<float>(srcY) /
+                            static_cast<float>(image->getTextureHeight());
+        const float texX2 = static_cast<float>(srcX + width) /
+                            static_cast<float>(image->getTextureWidth());
+        const float texY2 = static_cast<float>(srcY + height) /
+                            static_cast<float>(image->getTextureHeight());
+
+        GLfloat tex[] =
+        {
+            texX1, texY1,
+            texX2, texY1,
+            texX2, texY2,
+            texX1, texY2
+        };
+
+        GLint vert[] =
+        {
+            dstX, dstY,
+            dstX + desiredWidth, dstY,
+            dstX + desiredWidth, dstY + desiredHeight,
+            dstX, dstY + desiredHeight
+        };
+
+        glVertexPointer(2, GL_FLOAT, 0, &vert);
+        glTexCoordPointer(2, GL_INT, 0, &tex);
+
+        glDrawArrays(GL_QUADS, 0, 4);
+    }
+    else
+    {
+        GLint tex[] =
+        {
+            srcX, srcY,
+            srcX + width, srcY,
+            srcX + width, srcY + height,
+            srcX, srcY + height
+        };
+        GLint vert[] =
+        {
+            dstX, dstY,
+            dstX + desiredWidth, dstY,
+            dstX + desiredWidth, dstY + desiredHeight,
+            dstX, dstY + desiredHeight
+        };
+
+        glVertexPointer(2, GL_INT, 0, &vert);
+        glTexCoordPointer(2, GL_INT, 0, &tex);
+
+        glDrawArrays(GL_QUADS, 0, 4);
+    }
+}
+
+
+bool OpenGLGraphics::drawImage(Image *image, int srcX, int srcY,
+                               int dstX, int dstY,
+                               int width, int height, bool useColor)
+{
+    if (!image)
+        return false;
+
+    srcX += image->mBounds.x;
+    srcY += image->mBounds.y;
+
+    if (!useColor)
+        glColor4f(1.0f, 1.0f, 1.0f, image->mAlpha);
+
+    bindTexture(Image::mTextureType, image->mGLImage);
+
+    setTexturingAndBlending(true);
+
+    drawQuad(image, srcX, srcY, dstX, dstY, width, height);
+
+    if (!useColor)
+    {
+        glColor4ub(static_cast<GLubyte>(mColor.r),
+                   static_cast<GLubyte>(mColor.g),
+                   static_cast<GLubyte>(mColor.b),
+                   static_cast<GLubyte>(mColor.a));
+    }
+
+    return true;
+}
+
+bool OpenGLGraphics::drawRescaledImage(Image *image, int srcX, int srcY,
+                                       int dstX, int dstY,
+                                       int width, int height,
+                                       int desiredWidth, int desiredHeight,
+                                       bool useColor)
+{
+    return drawRescaledImage(image, srcX, srcY,
+                             dstX, dstY,
+                             width, height,
+                             desiredWidth, desiredHeight,
+                             useColor, true);
+}
+
+bool OpenGLGraphics::drawRescaledImage(Image *image, int srcX, int srcY,
+                                       int dstX, int dstY,
+                                       int width, int height,
+                                       int desiredWidth, int desiredHeight,
+                                       bool useColor, bool smooth)
+{
+    if (!image)
+        return false;
+
+    // Just draw the image normally when no resizing is necessary,
+    if (width == desiredWidth && height == desiredHeight)
+    {
+        return drawImage(image, srcX, srcY, dstX, dstY,
+                         width, height, useColor);
+    }
+
+    // When the desired image is smaller than the current one,
+    // disable smooth effect.
+    if (width > desiredWidth && height > desiredHeight)
+        smooth = false;
+
+    srcX += image->mBounds.x;
+    srcY += image->mBounds.y;
+
+    if (!useColor)
+        glColor4f(1.0f, 1.0f, 1.0f, image->mAlpha);
+
+    bindTexture(Image::mTextureType, image->mGLImage);
+
+    setTexturingAndBlending(true);
+
+    // Draw a textured quad.
+    drawRescaledQuad(image, srcX, srcY, dstX, dstY, width, height,
+                     desiredWidth, desiredHeight);
+
+    if (smooth) // A basic smooth effect...
+    {
+        glColor4f(1.0f, 1.0f, 1.0f, 0.2f);
+        drawRescaledQuad(image, srcX, srcY, dstX - 1, dstY - 1, width, height,
+                         desiredWidth + 1, desiredHeight + 1);
+        drawRescaledQuad(image, srcX, srcY, dstX + 1, dstY + 1, width, height,
+                         desiredWidth - 1, desiredHeight - 1);
+
+        drawRescaledQuad(image, srcX, srcY, dstX + 1, dstY, width, height,
+                         desiredWidth - 1, desiredHeight);
+        drawRescaledQuad(image, srcX, srcY, dstX, dstY + 1, width, height,
+                         desiredWidth, desiredHeight - 1);
+    }
+
+    if (!useColor)
+    {
+        glColor4ub(static_cast<GLubyte>(mColor.r),
+                   static_cast<GLubyte>(mColor.g),
+                   static_cast<GLubyte>(mColor.b),
+                   static_cast<GLubyte>(mColor.a));
+    }
+
+    return true;
+}
+
+void OpenGLGraphics::drawImagePattern(Image *image, int x, int y, int w, int h)
+{
+    if (!image)
+        return;
+
+    const int srcX = image->mBounds.x;
+    const int srcY = image->mBounds.y;
+
+    const int iw = image->getWidth();
+    const int ih = image->getHeight();
+
+    if (iw == 0 || ih == 0)
+        return;
+
+    const float tw = static_cast<float>(image->getTextureWidth());
+    const float th = static_cast<float>(image->getTextureHeight());
+
+    glColor4f(1.0f, 1.0f, 1.0f, image->mAlpha);
+
+    bindTexture(Image::mTextureType, image->mGLImage);
+
+    setTexturingAndBlending(true);
+
+    unsigned int vp = 0;
+    const unsigned int vLimit = vertexBufSize * 4;
+    // Draw a set of textured rectangles
+    if (image->getTextureType() == GL_TEXTURE_2D)
+    {
+        float texX1 = static_cast<float>(srcX) / tw;
+        float texY1 = static_cast<float>(srcY) / th;
+
+        for (int py = 0; py < h; py += ih)
+        {
+            const int height = (py + ih >= h) ? h - py : ih;
+            const int dstY = y + py;
+            for (int px = 0; px < w; px += iw)
+            {
+                int width = (px + iw >= w) ? w - px : iw;
+                int dstX = x + px;
+
+                float texX2 = static_cast<float>(srcX + width) / tw;
+                float texY2 = static_cast<float>(srcY + height) / th;
+
+                mFloatTexArray[vp + 0] = texX1;
+                mFloatTexArray[vp + 1] = texY1;
+
+                mFloatTexArray[vp + 2] = texX2;
+                mFloatTexArray[vp + 3] = texY1;
+
+                mFloatTexArray[vp + 4] = texX2;
+                mFloatTexArray[vp + 5] = texY2;
+
+                mFloatTexArray[vp + 6] = texX1;
+                mFloatTexArray[vp + 7] = texY2;
+
+                mIntVertArray[vp + 0] = dstX;
+                mIntVertArray[vp + 1] = dstY;
+
+                mIntVertArray[vp + 2] = dstX + width;
+                mIntVertArray[vp + 3] = dstY;
+
+                mIntVertArray[vp + 4] = dstX + width;
+                mIntVertArray[vp + 5] = dstY + height;
+
+                mIntVertArray[vp + 6] = dstX;
+                mIntVertArray[vp + 7] = dstY + height;
+
+                vp += 8;
+                if (vp >= vLimit)
+                {
+                    drawQuadArrayfi(vp);
+                    vp = 0;
+                }
+            }
+        }
+        if (vp > 0)
+            drawQuadArrayfi(vp);
+    }
+    else
+    {
+        for (int py = 0; py < h; py += ih)
+        {
+            const int height = (py + ih >= h) ? h - py : ih;
+            const int dstY = y + py;
+            for (int px = 0; px < w; px += iw)
+            {
+                int width = (px + iw >= w) ? w - px : iw;
+                int dstX = x + px;
+
+                mIntTexArray[vp + 0] = srcX;
+                mIntTexArray[vp + 1] = srcY;
+
+                mIntTexArray[vp + 2] = srcX + width;
+                mIntTexArray[vp + 3] = srcY;
+
+                mIntTexArray[vp + 4] = srcX + width;
+                mIntTexArray[vp + 5] = srcY + height;
+
+                mIntTexArray[vp + 6] = srcX;
+                mIntTexArray[vp + 7] = srcY + height;
+
+                mIntVertArray[vp + 0] = dstX;
+                mIntVertArray[vp + 1] = dstY;
+
+                mIntVertArray[vp + 2] = dstX + width;
+                mIntVertArray[vp + 3] = dstY;
+
+                mIntVertArray[vp + 4] = dstX + width;
+                mIntVertArray[vp + 5] = dstY + height;
+
+                mIntVertArray[vp + 6] = dstX;
+                mIntVertArray[vp + 7] = dstY + height;
+
+                vp += 8;
+                if (vp >= vLimit)
+                {
+                    drawQuadArrayii(vp);
+                    vp = 0;
+                }
+            }
+        }
+        if (vp > 0)
+            drawQuadArrayii(vp);
+    }
+
+    glColor4ub(static_cast<GLubyte>(mColor.r),
+               static_cast<GLubyte>(mColor.g),
+               static_cast<GLubyte>(mColor.b),
+               static_cast<GLubyte>(mColor.a));
+}
+
+void OpenGLGraphics::drawRescaledImagePattern(Image *image, int x, int y,
+                                              int w, int h, int scaledWidth,
+                                              int scaledHeight)
+{
+    if (!image)
+        return;
+
+    const int srcX = image->mBounds.x;
+    const int srcY = image->mBounds.y;
+
+    const int iw = scaledWidth;
+    const int ih = scaledHeight;
+    if (iw == 0 || ih == 0)
+        return;
+
+    const float tw = static_cast<float>(image->getTextureWidth());
+    const float th = static_cast<float>(image->getTextureHeight());
+
+    glColor4f(1.0f, 1.0f, 1.0f, image->mAlpha);
+
+    bindTexture(Image::mTextureType, image->mGLImage);
+
+    setTexturingAndBlending(true);
+
+    unsigned int vp = 0;
+    const unsigned int vLimit = vertexBufSize * 4;
+
+    float texX1 = static_cast<float>(srcX) / tw;
+    float texY1 = static_cast<float>(srcY) / th;
+
+    // Draw a set of textured rectangles
+    if (image->getTextureType() == GL_TEXTURE_2D)
+    {
+        for (int py = 0; py < h; py += ih)
+        {
+            const int height = (py + ih >= h) ? h - py : ih;
+            const int dstY = y + py;
+            for (int px = 0; px < w; px += iw)
+            {
+                int width = (px + iw >= w) ? w - px : iw;
+                int dstX = x + px;
+
+                float texX2 = static_cast<float>(srcX + width) / tw;
+                float texY2 = static_cast<float>(srcY + height) / th;
+
+                mFloatTexArray[vp + 0] = texX1;
+                mFloatTexArray[vp + 1] = texY1;
+
+                mFloatTexArray[vp + 2] = texX2;
+                mFloatTexArray[vp + 3] = texY1;
+
+                mFloatTexArray[vp + 4] = texX2;
+                mFloatTexArray[vp + 5] = texY2;
+
+                mFloatTexArray[vp + 6] = texX1;
+                mFloatTexArray[vp + 7] = texY2;
+
+                mIntVertArray[vp + 0] = dstX;
+                mIntVertArray[vp + 1] = dstY;
+
+                mIntVertArray[vp + 2] = dstX + scaledWidth;
+                mIntVertArray[vp + 3] = dstY;
+
+                mIntVertArray[vp + 4] = dstX + scaledWidth;
+                mIntVertArray[vp + 5] = dstY + scaledHeight;
+
+                mIntVertArray[vp + 6] = dstX;
+                mIntVertArray[vp + 7] = dstY + scaledHeight;
+
+                vp += 8;
+                if (vp >= vLimit)
+                {
+                    drawQuadArrayfi(vp);
+                    vp = 0;
+                }
+            }
+        }
+        if (vp > 0)
+            drawQuadArrayfi(vp);
+    }
+    else
+    {
+        for (int py = 0; py < h; py += ih)
+        {
+            const int height = (py + ih >= h) ? h - py : ih;
+            const int dstY = y + py;
+            for (int px = 0; px < w; px += iw)
+            {
+                int width = (px + iw >= w) ? w - px : iw;
+                int dstX = x + px;
+
+                mIntTexArray[vp + 0] = srcX;
+                mIntTexArray[vp + 1] = srcY;
+
+                mIntTexArray[vp + 2] = srcX + width;
+                mIntTexArray[vp + 3] = srcY;
+
+                mIntTexArray[vp + 4] = srcX + width;
+                mIntTexArray[vp + 5] = srcY + height;
+
+                mIntTexArray[vp + 6] = srcX;
+                mIntTexArray[vp + 7] = srcY + height;
+
+                mIntVertArray[vp + 0] = dstX;
+                mIntVertArray[vp + 1] = dstY;
+
+                mIntVertArray[vp + 2] = dstX + scaledWidth;
+                mIntVertArray[vp + 3] = dstY;
+
+                mIntVertArray[vp + 4] = dstX + scaledWidth;
+                mIntVertArray[vp + 5] = dstY + scaledHeight;
+
+                mIntVertArray[vp + 6] = dstX;
+                mIntVertArray[vp + 7] = dstY + scaledHeight;
+
+                vp += 8;
+                if (vp >= vLimit)
+                {
+                    drawQuadArrayii(vp);
+                    vp = 0;
+                }
+            }
+        }
+        if (vp > 0)
+            drawQuadArrayii(vp);
+    }
+
+    glColor4ub(static_cast<GLubyte>(mColor.r),
+               static_cast<GLubyte>(mColor.g),
+               static_cast<GLubyte>(mColor.b),
+               static_cast<GLubyte>(mColor.a));
+}
+
+void OpenGLGraphics::updateScreen()
+{
+    glFlush();
+    glFinish();
+    SDL_GL_SwapBuffers();
+}
+
+void OpenGLGraphics::_beginDraw()
+{
+    glMatrixMode(GL_TEXTURE);
+    glLoadIdentity();
+
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+
+    glOrtho(0.0, (double)mTarget->w, (double)mTarget->h, 0.0, -1.0, 1.0);
+
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+
+    glEnable(GL_SCISSOR_TEST);
+    glEnableClientState(GL_VERTEX_ARRAY);
+
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+    glEnableClientState(GL_VERTEX_ARRAY);
+    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+
+    glHint(GL_LINE_SMOOTH_HINT, GL_FASTEST);
+    glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_FASTEST);
+    glHint(GL_POINT_SMOOTH_HINT, GL_FASTEST);
+    glHint(GL_POLYGON_SMOOTH_HINT, GL_FASTEST);
+
+#ifndef __MINGW32__
+    glHint(GL_TEXTURE_COMPRESSION_HINT, GL_FASTEST);
+#endif
+
+//    glScalef(0.5f, 0.5f, 0.5f);
+
+    pushClipArea(gcn::Rectangle(0, 0, mTarget->w, mTarget->h));
+}
+
+void OpenGLGraphics::_endDraw()
+{
+}
+
+SDL_Surface* OpenGLGraphics::getScreenshot()
+{
+    int h = mTarget->h;
+    int w = mTarget->w;
+
+    SDL_Surface *screenshot = SDL_CreateRGBSurface(
+            SDL_SWSURFACE,
+            w, h, 24,
+            0xff0000, 0x00ff00, 0x0000ff, 0x000000);
+
+    if (SDL_MUSTLOCK(screenshot))
+        SDL_LockSurface(screenshot);
+
+    // Grap the pixel buffer and write it to the SDL surface
+    glPixelStorei(GL_PACK_ALIGNMENT, 1);
+    glReadPixels(0, 0, w, h, GL_RGB, GL_UNSIGNED_BYTE, screenshot->pixels);
+
+    // Flip the screenshot, as OpenGL has 0,0 in bottom left
+    unsigned int lineSize = 3 * w;
+    GLubyte* buf = (GLubyte*)malloc(lineSize);
+
+    for (int i = 0; i < (h / 2); i++)
+    {
+        GLubyte *top = (GLubyte*)screenshot->pixels + lineSize * i;
+        GLubyte *bot = (GLubyte*)screenshot->pixels + lineSize * (h - 1 - i);
+
+        memcpy(buf, top, lineSize);
+        memcpy(top, bot, lineSize);
+        memcpy(bot, buf, lineSize);
+    }
+
+    free(buf);
+
+    if (SDL_MUSTLOCK(screenshot))
+        SDL_UnlockSurface(screenshot);
+
+    return screenshot;
+}
+
+bool OpenGLGraphics::pushClipArea(gcn::Rectangle area)
+{
+    int transX = 0;
+    int transY = 0;
+
+    if (!mClipStack.empty())
+    {
+        transX = -mClipStack.top().xOffset;
+        transY = -mClipStack.top().yOffset;
+    }
+
+    bool result = gcn::Graphics::pushClipArea(area);
+
+    transX += mClipStack.top().xOffset;
+    transY += mClipStack.top().yOffset;
+
+    glPushMatrix();
+    glTranslatef(static_cast<GLfloat>(transX),
+                 static_cast<GLfloat>(transY), 0);
+    glScissor(mClipStack.top().x,
+              mTarget->h - mClipStack.top().y - mClipStack.top().height,
+              mClipStack.top().width,
+              mClipStack.top().height);
+
+    return result;
+}
+
+void OpenGLGraphics::popClipArea()
+{
+    gcn::Graphics::popClipArea();
+
+    if (mClipStack.empty())
+        return;
+
+    glPopMatrix();
+    glScissor(mClipStack.top().x,
+              mTarget->h - mClipStack.top().y - mClipStack.top().height,
+              mClipStack.top().width,
+              mClipStack.top().height);
+}
+
+void OpenGLGraphics::setColor(const gcn::Color& color)
+{
+    mColor = color;
+    glColor4ub(static_cast<GLubyte>(color.r),
+               static_cast<GLubyte>(color.g),
+               static_cast<GLubyte>(color.b),
+               static_cast<GLubyte>(color.a));
+
+    mColorAlpha = (color.a != 255);
+}
+
+void OpenGLGraphics::drawPoint(int x, int y)
+{
+    setTexturingAndBlending(false);
+
+    glBegin(GL_POINTS);
+    glVertex2i(x, y);
+    glEnd();
+}
+
+void OpenGLGraphics::drawLine(int x1, int y1, int x2, int y2)
+{
+    setTexturingAndBlending(false);
+
+    float x3 = static_cast<float>(x2) + 0.5f;
+    float y3 = static_cast<float>(y2) + 0.5f;
+
+    glBegin(GL_LINES);
+    glVertex2f(static_cast<float>(x1) + 0.5f, static_cast<float>(y1) + 0.5f);
+    glVertex2f(x3, y3);
+    glEnd();
+
+    glBegin(GL_POINTS);
+    glVertex2f(x3, y3);
+    glEnd();
+}
+
+void OpenGLGraphics::drawRectangle(const gcn::Rectangle& rect)
+{
+    drawRectangle(rect, false);
+}
+
+void OpenGLGraphics::fillRectangle(const gcn::Rectangle& rect)
+{
+    drawRectangle(rect, true);
+}
+
+void OpenGLGraphics::setTargetPlane(int width _UNUSED_, int height _UNUSED_)
+{
+}
+
+void OpenGLGraphics::setTexturingAndBlending(bool enable)
+{
+    if (enable)
+    {
+        if (!mTexture)
+        {
+            glEnable(Image::mTextureType);
+            mTexture = true;
+        }
+
+        if (!mAlpha)
+        {
+            glEnable(GL_BLEND);
+            mAlpha = true;
+        }
+    }
+    else
+    {
+        mLastImage = 0;
+        if (mAlpha && !mColorAlpha)
+        {
+            glDisable(GL_BLEND);
+            mAlpha = false;
+        }
+        else if (!mAlpha && mColorAlpha)
+        {
+            glEnable(GL_BLEND);
+            mAlpha = true;
+        }
+
+        if (mTexture)
+        {
+            glDisable(Image::mTextureType);
+            mTexture = false;
+        }
+    }
+}
+
+void OpenGLGraphics::drawRectangle(const gcn::Rectangle& rect, bool filled)
+{
+    const float offset = filled ? 0 : 0.5f;
+    const float x = static_cast<float>(rect.x);
+    const float y = static_cast<float>(rect.y);
+    const float width = static_cast<float>(rect.width);
+    const float height = static_cast<float>(rect.height);
+
+    setTexturingAndBlending(false);
+    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+
+    GLfloat vert[] =
+    {
+        x + offset, y + offset,
+        x + width - offset, y + offset,
+        x + width - offset, y + height - offset,
+        x + offset, y + height - offset
+    };
+
+    glVertexPointer(2, GL_FLOAT, 0, &vert);
+    glDrawArrays(filled ? GL_QUADS : GL_LINE_LOOP, 0, 4);
+
+    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+}
+
+bool OpenGLGraphics::drawNet(int x1, int y1, int x2, int y2,
+                             int width, int height)
+{
+    unsigned int vp = 0;
+    const unsigned int vLimit = vertexBufSize * 4;
+
+    setTexturingAndBlending(false);
+    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+
+    const float xf1 = static_cast<float>(x1);
+    const float xf2 = static_cast<float>(x2);
+    const float yf1 = static_cast<float>(y1);
+    const float yf2 = static_cast<float>(y2);
+
+    for (int y = y1; y < y2; y += height)
+    {
+        mFloatTexArray[vp + 0] = xf1;
+        mFloatTexArray[vp + 1] = static_cast<float>(y);
+
+        mFloatTexArray[vp + 2] = xf2;
+        mFloatTexArray[vp + 3] = static_cast<float>(y);
+
+        vp += 4;
+        if (vp >= vLimit)
+        {
+            drawLineArrayf(vp);
+            vp = 0;
+        }
+    }
+
+    for (int x = x1; x < x2; x += width)
+    {
+        mFloatTexArray[vp + 0] = static_cast<float>(x);
+        mFloatTexArray[vp + 1] = yf1;
+
+        mFloatTexArray[vp + 2] = static_cast<float>(x);
+        mFloatTexArray[vp + 3] = yf2;
+
+        vp += 4;
+        if (vp >= vLimit)
+        {
+            drawLineArrayf(vp);
+            vp = 0;
+        }
+    }
+
+    if (vp > 0)
+        drawLineArrayf(vp);
+
+    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+    return true;
+}
+
+void OpenGLGraphics::bindTexture(GLenum target, GLuint texture)
+{
+    if (mLastImage != texture)
+    {
+        mLastImage = texture;
+        glBindTexture(target, texture);
+    }
+}
+
+inline void OpenGLGraphics::drawQuadArrayfi(int size)
+{
+    glVertexPointer(2, GL_INT, 0, mIntVertArray);
+    glTexCoordPointer(2, GL_FLOAT, 0, mFloatTexArray);
+
+    glDrawArrays(GL_QUADS, 0, size / 2);
+}
+
+inline void OpenGLGraphics::drawQuadArrayii(int size)
+{
+    glVertexPointer(2, GL_INT, 0, mIntVertArray);
+    glTexCoordPointer(2, GL_INT, 0, mIntTexArray);
+
+    glDrawArrays(GL_QUADS, 0, size / 2);
+}
+
+inline void OpenGLGraphics::drawLineArrayi(int size)
+{
+    glVertexPointer(2, GL_INT, 0, mIntVertArray);
+
+    glDrawArrays(GL_LINES, 0, size / 2);
+}
+
+inline void OpenGLGraphics::drawLineArrayf(int size)
+{
+    glVertexPointer(2, GL_FLOAT, 0, mFloatTexArray);
+
+    glDrawArrays(GL_LINES, 0, size / 2);
+}
+
+#endif // USE_OPENGL