voxelcore/src/graphics/render/MainBatch.cpp

#include "MainBatch.hpp"

#include "graphics/core/Texture.hpp"
#include "graphics/core/Mesh.hpp"
#include "graphics/core/ImageData.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();
    }
}