ladybird/Libraries/LibWeb/WebGL/WebGLRenderingContextBase.h

/*
 * Copyright (c) 2024-2025, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#pragma once

#include <LibJS/Runtime/TypedArray.h>
#include <LibWeb/Forward.h>
#include <LibWeb/WebIDL/Types.h>

namespace Web::WebGL {

// NOTE: This is the Variant created by the IDL wrapper generator, and needs to be updated accordingly.
using TexImageSource = Variant<GC::Root<HTML::ImageBitmap>, GC::Root<HTML::ImageData>, GC::Root<HTML::HTMLImageElement>, GC::Root<HTML::HTMLCanvasElement>, GC::Root<HTML::OffscreenCanvas>, GC::Root<HTML::HTMLVideoElement>>;

// FIXME: This object should inherit from Bindings::PlatformObject and implement the WebGLRenderingContextBase IDL interface.
//        We should make WebGL code generator to produce implementation for this interface.
class WebGLRenderingContextBase {
public:
    using Float32List = Variant<GC::Root<JS::Float32Array>, Vector<float>>;
    using Int32List = Variant<GC::Root<JS::Int32Array>, Vector<WebIDL::Long>>;
    using Uint32List = Variant<GC::Root<JS::Uint32Array>, Vector<WebIDL::UnsignedLong>>;

    virtual GC::Cell const* gc_cell() const = 0;
    virtual void visit_edges(JS::Cell::Visitor&) = 0;
    virtual OpenGLContext& context() = 0;

    static Span<float> span_from_float32_list(Float32List& float32_list)
    {
        if (float32_list.has<Vector<float>>())
            return float32_list.get<Vector<float>>();
        return float32_list.get<GC::Root<JS::Float32Array>>()->data();
    }

    static Span<int> span_from_int32_list(Int32List& int32_list)
    {
        if (int32_list.has<Vector<int>>())
            return int32_list.get<Vector<int>>();
        return int32_list.get<GC::Root<JS::Int32Array>>()->data();
    }

    static Span<u32> span_from_uint32_list(Uint32List& int32_list)
    {
        if (int32_list.has<Vector<u32>>())
            return int32_list.get<Vector<u32>>();
        return int32_list.get<GC::Root<JS::Uint32Array>>()->data();
    }

    struct ConvertedTexture {
        ByteBuffer buffer;
        int width { 0 };
        int height { 0 };
    };
    static Optional<ConvertedTexture> read_and_pixel_convert_texture_image_source(TexImageSource const& source, WebIDL::UnsignedLong format, WebIDL::UnsignedLong type, Optional<int> destination_width = OptionalNone {}, Optional<int> destination_height = OptionalNone {});
};

}