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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_WEBGL_WEBGL_CONTEXT_OBJECT_SUPPORT_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBGL_WEBGL_CONTEXT_OBJECT_SUPPORT_H_
#include <bitset>
#include "base/task/single_thread_task_runner.h"
#include "third_party/blink/renderer/modules/modules_export.h"
#include "third_party/blink/renderer/modules/webgl/webgl_extension_name.h"
#include "third_party/blink/renderer/platform/bindings/script_wrappable.h"
#include "third_party/khronos/GLES2/gl2.h"
#include "third_party/khronos/GLES2/gl2ext.h"
#include "third_party/khronos/GLES3/gl31.h"
namespace gpu::gles2 {
class GLES2Interface;
}
namespace blink {
// Base classes for WebGL rendering contexts that contains all the information
// needed by WebGLObject and child classes. This is used to avoid a dependency
// on WebGLRenderingContextBase and keep logic and effects more local.
class MODULES_EXPORT WebGLContextObjectSupport : public ScriptWrappable {
public:
// The GLES2Interface to use for the underlying GL context, it is nullptr when
// the context is lost.
gpu::gles2::GLES2Interface* ContextGL() const { return gles2_interface_; }
bool IsWebGL2() const { return is_webgl2_; }
bool IsLost() const { return is_lost_; }
// How many context losses there were, to check whether a WebGLObject was
// created since the last context resoration or before that (and hence invalid
// to use).
uint32_t NumberOfContextLosses() const { return number_of_context_losses_; }
bool ExtensionEnabled(WebGLExtensionName name) const {
return extensions_enabled_.test(name);
}
scoped_refptr<base::SingleThreadTaskRunner> GetContextTaskRunner();
void Trace(Visitor*) const override;
protected:
WebGLContextObjectSupport(
scoped_refptr<base::SingleThreadTaskRunner> task_runner,
bool is_webgl2);
// Must be called when the WebGL context is lost.
void OnContextLost();
// Must be called when the WebGL context is created or restored, also sets up
// the GLES2Interface that will be used for the duration that this context is
// active.
void OnContextRestored(gpu::gles2::GLES2Interface*);
void MarkExtensionEnabled(WebGLExtensionName name);
private:
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
std::bitset<kWebGLExtensionNameCount> extensions_enabled_ = {};
raw_ptr<gpu::gles2::GLES2Interface> gles2_interface_ = nullptr;
uint32_t number_of_context_losses_ = 0;
bool is_lost_ = true;
bool is_webgl2_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBGL_WEBGL_CONTEXT_OBJECT_SUPPORT_H_
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