add atlas textures support.

1 files changed, 302 insertions, 0 deletions

diff --git a/src/resources/atlasmanager.cpp b/src/resources/atlasmanager.cpp
new file mode 100644
index 000000000..770e43412
--- /dev/null
+++ b/src/resources/atlasmanager.cpp
@@ -0,0 +1,302 @@
+/*
+ *  The ManaPlus Client
+ *  Copyright (C) 2012  The ManaPlus Developers
+ *
+ *  This file is part of The ManaPlus 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 "resources/atlasmanager.h"
+#include "resources/openglimagehelper.h"
+
+#include "client.h"
+#include "graphics.h"
+#include "graphicsmanager.h"
+#include "logger.h"
+
+#include "utils/mathutils.h"
+#include "utils/physfsrwops.h"
+
+#include "resources/fboinfo.h"
+#include "resources/imagehelper.h"
+#include "resources/imagewriter.h"
+#include "resources/resourcemanager.h"
+
+#include "debug.h"
+
+AtlasManager::AtlasManager()
+{
+}
+
+AtlasResource *AtlasManager::loadTextureAtlas(const std::string &name,
+                                              const StringVect &files)
+{
+    std::vector<TextureAtlas*> atlases;
+    std::vector<Image*> images;
+    AtlasResource *resource = new AtlasResource;
+
+    loadImages(files, images);
+    int maxSize = OpenGLImageHelper::getTextureSize();
+//    int maxSize = 1024;
+
+    // sorting images on atlases.
+    simpleSort(name, atlases, images, maxSize);
+
+    int k = 0;
+    for (std::vector<TextureAtlas*>::iterator it = atlases.begin(),
+         it_end = atlases.end(); it != it_end; ++ it)
+    {
+        TextureAtlas *atlas = *it;
+        if (!atlas)
+            continue;
+
+        // create atlas base on sorted images
+        SDL_Surface *surface = createSDLAtlas(atlas);
+
+        if (!surface)
+            continue;
+
+        // debug save
+        ImageWriter::writePNG(surface, Client::getTempDirectory()
+            + "/atlas" + name + toString(k) + ".png");
+        k ++;
+
+        // covert SDL images to OpenGL
+        convertAtlas(atlas);
+
+        // free SDL atlas surface
+        SDL_FreeSurface(surface);
+
+        resource->atlases.push_back(atlas);
+    }
+
+    return resource;
+}
+
+void AtlasManager::loadImages(const StringVect &files,
+                              std::vector<Image*> &images)
+{
+    for (StringVectCIter it = files.begin(), it_end = files.end();
+          it != it_end; ++ it)
+    {
+        const std::string str = *it;
+        SDL_RWops *rw = PHYSFSRWOPS_openRead(str.c_str());
+        Image *image = sdlImageHelper->load(rw);
+        if (image)
+        {
+            image->mIdPath = str;
+            images.push_back(image);
+        }
+    }
+}
+
+void AtlasManager::simpleSort(const std::string &name,
+                              std::vector<TextureAtlas*> &atlases,
+                              std::vector<Image*> &images, int size)
+{
+    int x = 0;
+    int y = 0;
+    int tempHeight = 0;
+    TextureAtlas *atlas = new TextureAtlas();
+    std::vector<Image*>::iterator it = images.begin();
+    const std::vector<Image*>::const_iterator it_end = images.end();
+    for (it = images.begin(); it != it_end; ++ it)
+    {
+        Image *img = *it;
+        if (img)
+        {
+            atlas->name = "atlas_" + name + "_" + img->getIdPath();
+            break;
+        }
+    }
+
+    for (it = images.begin(); it != it_end; ++ it)
+    {
+        Image *img = *it;
+        if (img)
+        {
+            AtlasItem *item = new AtlasItem(img);
+            item->name = img->getIdPath();
+            // start next line
+            if (x + img->mBounds.w > size)
+            {
+                x = 0;
+                y += tempHeight;
+                tempHeight = 0;
+            }
+
+            // cant put image with this height
+            if (y + img->mBounds.h > size)
+            {
+                x = 0;
+                y = 0;
+                atlases.push_back(atlas);
+                atlas = new TextureAtlas();
+                atlas->name = "atlas_" + name + "_" + img->getIdPath();
+            }
+
+            if (img->mBounds.h > tempHeight)
+                tempHeight = img->mBounds.h;
+
+            logger->log("image draw position: %d,%d (%d,%d)",
+                x, y, img->mBounds.w, img->mBounds.h);
+            item->x = x;
+            item->y = y;
+            atlas->items.push_back(item);
+
+            // continue put textures in line
+            x += img->mBounds.w;
+            if (x > atlas->width)
+                atlas->width = x;
+            if (y + img->mBounds.h > atlas->height)
+                atlas->height = y + img->mBounds.h;
+        }
+    }
+    if (!atlas->items.empty())
+        atlases.push_back(atlas);
+    else
+        delete atlas;
+}
+
+SDL_Surface *AtlasManager::createSDLAtlas(TextureAtlas *atlas)
+{
+#if SDL_BYTEORDER == SDL_BIG_ENDIAN
+    const int rmask = 0xff000000;
+    const int gmask = 0x00ff0000;
+    const int bmask = 0x0000ff00;
+    const int amask = 0x000000ff;
+#else
+    const int rmask = 0x000000ff;
+    const int gmask = 0x0000ff00;
+    const int bmask = 0x00ff0000;
+    const int amask = 0xff000000;
+#endif
+
+    // do not create atlas based on only one image
+    if (atlas->items.size() == 1)
+        return nullptr;
+
+    // using only power of two sizes.
+    atlas->width = powerOfTwo(atlas->width);
+    atlas->height = powerOfTwo(atlas->height);
+
+    // temp SDL surface for atlas
+    SDL_Surface *surface = SDL_CreateRGBSurface(SDL_SWSURFACE,
+        atlas->width, atlas->height, 32, rmask, gmask, bmask, amask);
+
+    if (!surface)
+        return nullptr;
+
+    Graphics *graphics = new Graphics();
+    graphics->setTarget(surface);
+    graphics->_beginDraw();
+
+    // drawing SDL images to surface
+    for (std::vector<AtlasItem*>::iterator it = atlas->items.begin(),
+         it_end = atlas->items.end();
+         it != it_end; ++ it)
+    {
+        AtlasItem *item = *it;
+        Image *image = item->image;
+
+        if (image)
+        {
+            SDL_SetAlpha(image->mSDLSurface, 0, SDL_ALPHA_OPAQUE);
+            graphics->drawImage(image, item->x, item->y);
+        }
+    }
+
+    delete graphics;
+    atlas->surface = surface;
+    return surface;
+}
+
+void AtlasManager::convertAtlas(TextureAtlas *atlas)
+{
+    // convert surface to OpemGL image
+    atlas->atlasImage = imageHelper->load(atlas->surface);
+    Image *const image = atlas->atlasImage;
+
+    for (std::vector<AtlasItem*>::iterator it = atlas->items.begin(),
+         it_end = atlas->items.end();
+         it != it_end; ++ it)
+    {
+        AtlasItem *const item = *it;
+        // delete SDL Image
+        delete item->image;
+        // store OpenGL image
+        item->image = image->getSubImage(item->x, item->y,
+            item->width, item->height);
+    }
+}
+
+void AtlasManager::injectToResources(AtlasResource *resource)
+{
+    ResourceManager *const resman = ResourceManager::getInstance();
+    int k = 0;
+    for (std::vector<TextureAtlas*>::iterator it = resource->atlases.begin(),
+         it_end = resource->atlases.end(); it != it_end; ++ it, k ++)
+    {
+        // add each atlas image to resources
+        TextureAtlas *const atlas = *it;
+        resman->addResource(atlas->name, atlas->atlasImage);
+        if (atlas)
+        {
+            for (std::vector<AtlasItem*>::iterator it2 = atlas->items.begin(),
+                 it2_end = atlas->items.end();
+                 it2 != it2_end; ++ it2)
+            {
+                AtlasItem *const item = *it2;
+                // add each atlas sub image to resources
+                resman->addResource(item->name, item->image);
+            }
+        }
+    }
+}
+
+AtlasResource::~AtlasResource()
+{
+    for (std::vector<TextureAtlas*>::iterator it = atlases.begin(),
+         it_end = atlases.end(); it != it_end; ++ it)
+    {
+        TextureAtlas *const atlas = *it;
+        if (atlas)
+        {
+            for (std::vector<AtlasItem*>::iterator it2 = atlas->items.begin(),
+                 it2_end = atlas->items.end();
+                 it2 != it2_end; ++ it2)
+            {
+                AtlasItem *const item = *it2;
+                if (item)
+                {
+                    Image *const image = item->image;
+                    if (image)
+                        image->decRef();
+                    delete item;
+                }
+            }
+            Image *const image = atlas->atlasImage;
+            if (image)
+                image->decRef();
+            delete atlas;
+        }
+    }
+}
+
+#endif