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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef FLUTTER_SHELL_GPU_GPU_SURFACE_GL_DELEGATE_H_
#define FLUTTER_SHELL_GPU_GPU_SURFACE_GL_DELEGATE_H_
#include "flutter/flow/embedded_views.h"
#include "flutter/fml/macros.h"
#include "third_party/skia/include/core/SkMatrix.h"
#include "third_party/skia/include/gpu/gl/GrGLInterface.h"
namespace flutter {
class GPUSurfaceGLDelegate {
public:
// Called to make the main GL context current on the current thread.
virtual bool GLContextMakeCurrent() = 0;
// Called to clear the current GL context on the thread. This may be called on
// either the GPU or IO threads.
virtual bool GLContextClearCurrent() = 0;
// Called to present the main GL surface. This is only called for the main GL
// context and not any of the contexts dedicated for IO.
virtual bool GLContextPresent() = 0;
// The ID of the main window bound framebuffer. Typically FBO0.
virtual intptr_t GLContextFBO() const = 0;
// The rendering subsystem assumes that the ID of the main window bound
// framebuffer remains constant throughout. If this assumption in incorrect,
// embedders are required to return true from this method. In such cases,
// GLContextFBO() will be called again to acquire the new FBO ID for rendering
// subsequent frames.
virtual bool GLContextFBOResetAfterPresent() const;
// Create an offscreen surface to render into before onscreen composition.
virtual bool UseOffscreenSurface() const;
// A transformation applied to the onscreen surface before the canvas is
// flushed.
virtual SkMatrix GLContextSurfaceTransformation() const;
// Get a reference to the external views embedder. This happens on the same
// thread that the renderer is operating on.
virtual flutter::ExternalViewEmbedder* GetExternalViewEmbedder();
sk_sp<const GrGLInterface> GetGLInterface() const;
// TODO(chinmaygarde): The presence of this method is to work around the fact
// that not all platforms can accept a custom GL proc table. Migrate all
// platforms to move GL proc resolution to the embedder and remove this
// method.
static sk_sp<const GrGLInterface> GetDefaultPlatformGLInterface();
using GLProcResolver =
std::function<void* /* proc name */ (const char* /* proc address */)>;
// Provide a custom GL proc resolver. If no such resolver is present, Skia
// will attempt to do GL proc address resolution on its own. Embedders that
// have specific opinions on GL API selection or need to add their own
// instrumentation to specific GL calls can specify custom GL functions
// here.
virtual GLProcResolver GetGLProcResolver() const;
};
} // namespace flutter
#endif // FLUTTER_SHELL_GPU_GPU_SURFACE_GL_DELEGATE_H_