add <image ...> atlases support

src/coders/png.cpp

@@ -235,7 +235,6 @@ std::unique_ptr<ImageData> _png_load(const char* file){
     FILE *png = nullptr;
     char *pngbuf = nullptr;
     spng_ctx *ctx = nullptr;
-    unsigned char *out = nullptr;
 
     png = fopen(file, "rb");
     if (png == nullptr){
@@ -297,27 +296,24 @@ std::unique_ptr<ImageData> _png_load(const char* file){
         logger.error() << "spng_decoded_image_size(): " << spng_strerror(r);
         return nullptr;
     }
-    out = new unsigned char[out_size];
-    r = spng_decode_image(ctx, out, out_size, SPNG_FMT_RGBA8, 0);
+    auto out = std::make_unique<ubyte[]>(out_size);
+    r = spng_decode_image(ctx, out.get(), out_size, SPNG_FMT_RGBA8, 0);
     if (r != SPNG_SUCCESS){
-        delete[] out;
         delete[] pngbuf;
         spng_ctx_free(ctx);
         logger.error() << "spng_decode_image(): " << spng_strerror(r);
         return nullptr;
     }
 
-    unsigned char* flipped = new unsigned char[out_size];
-
+    auto flipped = std::make_unique<ubyte[]>(out_size);
     for (size_t i = 0; i < ihdr.height; i+=1){
         size_t rowsize = ihdr.width*4;
         for (size_t j = 0; j < rowsize; j++){
             flipped[(ihdr.height-i-1)*rowsize+j] = out[i*rowsize+j];
         }
     }
-    delete[] out; // <- finally delete out // no, delete spng usage
 
-    auto image = std::make_unique<ImageData>(ImageFormat::rgba8888, ihdr.width, ihdr.height, (void*)flipped);
+    auto image = std::make_unique<ImageData>(ImageFormat::rgba8888, ihdr.width, ihdr.height, std::move(flipped));
 
     delete[] pngbuf;
     spng_ctx_free(ctx);

src/graphics/core/Batch2D.cpp

@@ -39,6 +39,7 @@ void Batch2D::setPrimitive(DrawPrimitive primitive) {
 void Batch2D::begin(){
     currentTexture = nullptr;
     blank->bind();
+    region = blank->getUVRegion();
     color = glm::vec4(1.0f);
     primitive = DrawPrimitive::triangle;
 }
@@ -50,8 +51,8 @@ void Batch2D::vertex(
 ) {
     buffer[index++] = x;
     buffer[index++] = y;
-    buffer[index++] = u;
-    buffer[index++] = v;
+    buffer[index++] = u * region.getWidth() + region.u1;
+    buffer[index++] = v * region.getHeight() + region.v1;
     buffer[index++] = r;
     buffer[index++] = g;
     buffer[index++] = b;
@@ -64,8 +65,8 @@ void Batch2D::vertex(
 ) {
     buffer[index++] = point.x;
     buffer[index++] = point.y;
-    buffer[index++] = uvpoint.x;
-    buffer[index++] = uvpoint.y;
+    buffer[index++] = uvpoint.x * region.getWidth() + region.u1;
+    buffer[index++] = uvpoint.y * region.getHeight() + region.v1;
     buffer[index++] = r;
     buffer[index++] = g;
     buffer[index++] = b;
@@ -80,8 +81,10 @@ void Batch2D::texture(Texture* new_texture){
     currentTexture = new_texture;
     if (new_texture == nullptr) {
         blank->bind();
+        region = blank->getUVRegion();
     } else {
         new_texture->bind();
+        region = currentTexture->getUVRegion();
     }
 }
 
@@ -89,6 +92,10 @@ void Batch2D::untexture() {
     texture(nullptr);
 }
 
+void Batch2D::setRegion(UVRegion region) {
+    this->region = region;
+}
+
 void Batch2D::point(float x, float y, float r, float g, float b, float a){
     if (index + 6*B2D_VERTEX_SIZE >= capacity)
         flush();

src/graphics/core/Batch2D.hpp

@@ -6,10 +6,10 @@
 #include <glm/glm.hpp>
 
 #include "commons.hpp"
+#include "../../maths/UVRegion.hpp"
 
 class Mesh;
 class Texture;
-struct UVRegion;
 
 class Batch2D {
     std::unique_ptr<float[]> buffer;
@@ -20,6 +20,7 @@ class Batch2D {
     glm::vec4 color;
     Texture* currentTexture;
     DrawPrimitive primitive = DrawPrimitive::triangle;
+    UVRegion region {0.0f, 0.0f, 1.0f, 1.0f};
 
     void setPrimitive(DrawPrimitive primitive);
 
@@ -42,6 +43,7 @@ public:
     void begin();
     void texture(Texture* texture);
     void untexture();
+    void setRegion(UVRegion region);
     void sprite(float x, float y, float w, float h, const UVRegion& region, glm::vec4 tint);
     void sprite(float x, float y, float w, float h, int atlasRes, int index, glm::vec4 tint);
     void point(float x, float y, float r, float g, float b, float a);

src/graphics/core/GLTexture.hpp

@@ -20,6 +20,10 @@ public:
     virtual std::unique_ptr<ImageData> readData() override;
     virtual uint getId() const override;
 
+    virtual UVRegion getUVRegion() const override {
+        return UVRegion(0.0f, 0.0f, 1.0f, 1.0f);
+    }
+
     static std::unique_ptr<GLTexture> from(const ImageData* image);
 };
 

src/graphics/core/Texture.hpp

@@ -2,6 +2,7 @@
 #define GRAPHICS_CORE_TEXTURE_HPP_
 
 #include "../../typedefs.hpp"
+#include "../../maths/UVRegion.hpp"
 #include "ImageData.hpp"
 
 #include <memory>
@@ -28,6 +29,7 @@ public:
     virtual uint getHeight() const {
         return height;
     }
+    virtual UVRegion getUVRegion() const = 0;
 
     virtual uint getId() const = 0;
 

src/graphics/ui/elements/Image.cpp

@@ -5,6 +5,7 @@
 #include "../../core/DrawContext.hpp"
 #include "../../core/Batch2D.hpp"
 #include "../../core/Texture.hpp"
+#include "../../core/Atlas.hpp"
 #include "../../../assets/Assets.hpp"
 #include "../../../maths/UVRegion.hpp"
 
@@ -18,11 +19,28 @@ void Image::draw(const DrawContext* pctx, Assets* assets) {
     glm::vec2 pos = calcPos();
     auto batch = pctx->getBatch2D();
     
-    auto texture = assets->get<Texture>(this->texture);
-    if (texture && autoresize) {
-        setSize(glm::vec2(texture->getWidth(), texture->getHeight()));
+    Texture* texture = nullptr;
+    auto separator = this->texture.find(':');
+    if (separator == std::string::npos) {
+        texture = assets->get<Texture>(this->texture);
+        batch->texture(texture);
+        if (texture && autoresize) {
+            setSize(glm::vec2(texture->getWidth(), texture->getHeight()));
+        }
+    } else {
+        auto atlasName = this->texture.substr(0, separator);
+        if (auto atlas = assets->get<Atlas>(atlasName)) {
+            texture = atlas->getTexture();
+            batch->texture(atlas->getTexture());
+            auto& region = atlas->get(this->texture.substr(separator+1));
+            batch->setRegion(region);
+            if (autoresize) {
+                setSize(glm::vec2(
+                    texture->getWidth()*region.getWidth(), 
+                    texture->getHeight()*region.getHeight()));
+            }
+        }
     }
-    batch->texture(texture);
     batch->rect(
         pos.x, pos.y, size.x, size.y, 
         0, 0, 0, UVRegion(), false, true, calcColor()

src/maths/UVRegion.hpp

@@ -1,6 +1,8 @@
 #ifndef MATHS_UVREGION_HPP_
 #define MATHS_UVREGION_HPP_
 
+#include <cmath>
+
 struct UVRegion {
     float u1;
     float v1;
@@ -11,6 +13,14 @@ struct UVRegion {
     : u1(u1), v1(v1), u2(u2), v2(v2){}
 
     UVRegion() : u1(0.0f), v1(0.0f), u2(1.0f), v2(1.0f){}
+
+    inline float getWidth() const {
+        return fabs(u2-u1);
+    }
+
+    inline float getHeight() const {
+        return fabs(v2-v1);
+    }
 };
 
 #endif // MATHS_UVREGION_HPP_