src/graphics moved to src/graphics/core

src/graphics/core/Atlas.cpp

@@ -0,0 +1,87 @@
+#include "Atlas.h"
+
+#include <stdexcept>
+#include "../../maths/LMPacker.h"
+#include "Texture.h"
+#include "ImageData.h"
+
+Atlas::Atlas(ImageData* image, std::unordered_map<std::string, UVRegion> regions)
+  : texture(Texture::from(image)),
+    image(image),
+    regions(regions) {        
+}
+
+Atlas::~Atlas() {
+}
+
+bool Atlas::has(const std::string& name) const {
+    return regions.find(name) != regions.end();
+}
+
+const UVRegion& Atlas::get(const std::string& name) const {
+    return regions.at(name);
+}
+
+Texture* Atlas::getTexture() const {
+    return texture.get();
+}
+
+ImageData* Atlas::getImage() const {
+    return image.get();
+}
+
+void AtlasBuilder::add(std::string name, ImageData* image) {
+    entries.push_back(atlasentry{name, std::shared_ptr<ImageData>(image)});
+    names.insert(name);
+}
+
+bool AtlasBuilder::has(const std::string& name) const {
+    return names.find(name) != names.end();
+}
+
+Atlas* AtlasBuilder::build(uint extrusion, uint maxResolution) {
+    auto sizes = std::make_unique<uint[]>(entries.size() * 2);
+    uint index = 0;
+    for (auto& entry : entries) {
+        auto image = entry.image;
+        sizes[index++] = image->getWidth();
+        sizes[index++] = image->getHeight();
+    }
+    LMPacker packer(sizes.get(), entries.size()*2);
+    sizes.reset(nullptr);
+
+    uint width = 32;
+    uint height = 32;
+    while (!packer.buildCompact(width, height, extrusion)) {
+        if (width > height) {
+            height *= 2;
+        } else {
+            width *= 2;
+        }
+        if (width > maxResolution || height > maxResolution) {
+            throw std::runtime_error("max atlas resolution "+
+                                     std::to_string(maxResolution)+" exceeded");
+        }
+    }
+
+    auto canvas = std::make_unique<ImageData>(ImageFormat::rgba8888, width, height);
+    std::unordered_map<std::string, UVRegion> regions;
+    std::vector<rectangle> rects = packer.getResult();
+    for (uint i = 0; i < entries.size(); i++) {
+        const rectangle& rect = rects[i];
+        const atlasentry& entry = entries[rect.idx];
+        uint x = rect.x;
+        uint y = rect.y;
+        uint w = rect.width;
+        uint h = rect.height;
+        canvas->blit(entry.image.get(), rect.x, rect.y);
+        for (uint j = 0; j < extrusion; j++) {
+            canvas->extrude(x - j, y - j, w + j*2, h + j*2);
+        }
+        float unitX = 1.0f / width;
+        float unitY = 1.0f / height;
+        regions[entry.name] = UVRegion(unitX * x, unitY * y, 
+                                       unitX * (x + w), unitY * (y + h));
+    }
+    return new Atlas(canvas.release(), regions);
+}