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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef GPU_COMMAND_BUFFER_SERVICE_SHARED_IMAGE_SHARED_IMAGE_GL_UTILS_H_
#define GPU_COMMAND_BUFFER_SERVICE_SHARED_IMAGE_SHARED_IMAGE_GL_UTILS_H_
#include <optional>
#include "base/memory/raw_ptr.h"
#include "gpu/command_buffer/service/texture_manager.h"
#include "ui/gl/gl_utils.h"
namespace gpu {
// Common utilities for various backings.
// Sets GL state for readback.
class ScopedPackState {
public:
explicit ScopedPackState(int pack_row_length = 0, int pack_alignment = 4);
ScopedPackState(const ScopedPackState&) = delete;
ScopedPackState& operator=(const ScopedPackState&) = delete;
~ScopedPackState();
private:
const raw_ptr<gl::GLApi> api_;
GLint pack_buffer_ = 0;
std::optional<gl::ScopedPixelStore> pack_alignment_;
std::optional<gl::ScopedPixelStore> pack_row_length_;
std::optional<gl::ScopedPixelStore> pack_skip_pixels_;
std::optional<gl::ScopedPixelStore> pack_skip_rows_;
};
// Sets GL state for upload and copy.
class ScopedUnpackState {
public:
explicit ScopedUnpackState(bool uploading_data,
int unpack_row_length = 0,
int unpack_alignment = 4);
ScopedUnpackState(const ScopedUnpackState&) = delete;
ScopedUnpackState& operator=(const ScopedUnpackState&) = delete;
~ScopedUnpackState();
private:
const raw_ptr<gl::GLApi> api_;
// Always used if |es3_capable|.
GLint unpack_buffer_ = 0;
// Always used when |uploading_data|.
std::optional<gl::ScopedPixelStore> unpack_alignment_;
// Used when |uploading_data_| and (|es3_capable| or
// |supports_unpack_subimage|).
std::optional<gl::ScopedPixelStore> unpack_row_length_;
std::optional<gl::ScopedPixelStore> unpack_skip_pixels_;
std::optional<gl::ScopedPixelStore> unpack_skip_rows_;
// Used when |uploading_data| and |es3_capable|.
std::optional<gl::ScopedPixelStore> unpack_skip_images_;
std::optional<gl::ScopedPixelStore> unpack_image_height_;
// Used when |desktop_gl|.
std::optional<gl::ScopedPixelStore> unpack_swap_bytes_;
std::optional<gl::ScopedPixelStore> unpack_lsb_first_;
};
// Creates a new GL texture and returns GL texture ID.
GLuint MakeTextureAndSetParameters(
GLenum target,
bool framebuffer_attachment_angle,
scoped_refptr<gles2::TexturePassthrough>* passthrough_texture,
raw_ptr<gles2::Texture>* texture);
// Returns whether `glTexStorage2DEXTFn` is available to call on the GL driver.
bool IsTexStorage2DAvailable();
} // namespace gpu
#endif // GPU_COMMAND_BUFFER_SERVICE_SHARED_IMAGE_SHARED_IMAGE_GL_UTILS_H_
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