add MainBatch & refactor ModelBatch, Batch3D

src/graphics/render/MainBatch.cpp

@@ -0,0 +1,61 @@
+#include "MainBatch.hpp"
+
+#include "graphics/core/Texture.hpp"
+#include "graphics/core/Mesh.hpp"
+#include "graphics/core/ImageData.hpp"
+
+#include "typedefs.hpp"
+
+static const vattr attrs[] = {
+    {3}, {2}, {3}, {1}, {0}
+};
+
+MainBatch::MainBatch(size_t capacity)
+    : buffer(std::make_unique<float[]>(capacity * VERTEX_SIZE)),
+      capacity(capacity),
+      index(0),
+      mesh(std::make_unique<Mesh>(buffer.get(), 0, attrs)) {
+
+    const ubyte pixels[] = {
+        255, 255, 255, 255,
+    };
+    ImageData image(ImageFormat::rgba8888, 1, 1, pixels);
+    blank = Texture::from(&image);
+}
+
+MainBatch::~MainBatch() = default;
+
+void MainBatch::setTexture(const Texture* texture) {
+    if (texture == nullptr) {
+        texture = blank.get();
+    }
+    if (texture != this->texture) {
+        flush();
+    }
+    this->texture = texture;
+    region = UVRegion {0.0f, 0.0f, 1.0f, 1.0f};
+}
+
+void MainBatch::setTexture(const Texture* texture, const UVRegion& region) {
+    setTexture(texture);
+    this->region = region;
+}
+
+void MainBatch::flush() {
+    if (index == 0) {
+        return;
+    }
+    if (texture == nullptr) {
+        texture = blank.get();
+    }
+    texture->bind();
+    mesh->reload(buffer.get(), index / VERTEX_SIZE);
+    mesh->draw();
+    index = 0;
+}
+
+void MainBatch::prepare(int vertices) {
+    if (index + VERTEX_SIZE * vertices > capacity * VERTEX_SIZE) {
+        flush();
+    }
+}