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// Copyright 2021 Benjamin Barenblat
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
// An idiomatic C++ interface to EGL 1.5.
#ifndef GLPLANET_SRC_EGL_H_
#define GLPLANET_SRC_EGL_H_
#include <EGL/egl.h>
#include <X11/Xlib.h>
#include <utility>
#include <vector>
#include "src/undo_xlib_dot_h_namespace_pollution.h"
//
#include "src/util.h"
#include "third_party/abseil/absl/types/optional.h"
namespace egl {
class Context;
class Display;
class Surface;
// Makes a Context active in the current thread.
void BindContext(Surface&, Context&);
// Configuration attributes.
enum Attribute : EGLint {
kBufferSize = EGL_BUFFER_SIZE,
kRedSize = EGL_RED_SIZE,
kGreenSize = EGL_GREEN_SIZE,
kBlueSize = EGL_BLUE_SIZE,
kLuminanceSize = EGL_LUMINANCE_SIZE,
kAlphaSize = EGL_ALPHA_SIZE,
kAlphaMaskSize = EGL_ALPHA_MASK_SIZE,
kBindToTextureRgb = EGL_BIND_TO_TEXTURE_RGB,
kBindToTextureRgba = EGL_BIND_TO_TEXTURE_RGBA,
kColorBufferType = EGL_COLOR_BUFFER_TYPE,
kConfigCaveat = EGL_CONFIG_CAVEAT,
kConfigId = EGL_CONFIG_ID,
kConformantMask = EGL_CONFORMANT,
kDepthSize = EGL_DEPTH_SIZE,
kLevel = EGL_LEVEL,
kMatchNativePixmap = EGL_MATCH_NATIVE_PIXMAP,
kMaxSwapInterval = EGL_MAX_SWAP_INTERVAL,
kMinSwapInterval = EGL_MIN_SWAP_INTERVAL,
kNativeRenderable = EGL_NATIVE_RENDERABLE,
kNativeVisualId = EGL_NATIVE_VISUAL_ID,
kNativeVisualType = EGL_NATIVE_VISUAL_TYPE,
kSampleBuffers = EGL_SAMPLE_BUFFERS,
kSamples = EGL_SAMPLES,
kStencilSize = EGL_STENCIL_SIZE,
kSurfaceTypeMask = EGL_SURFACE_TYPE,
kTransparentType = EGL_TRANSPARENT_TYPE,
kTransparentRedValue = EGL_TRANSPARENT_RED_VALUE,
kTransparentGreenValue = EGL_TRANSPARENT_GREEN_VALUE,
kTransparentBlueValue = EGL_TRANSPARENT_BLUE_VALUE,
kRenderableTypeMask = EGL_RENDERABLE_TYPE,
};
// A "don't care" value for use in attribute lists.
constexpr int kDontCare = EGL_DONT_CARE;
enum class Api : EGLenum {
kOpenglEs = EGL_OPENGL_ES_API,
kOpenvg = EGL_OPENVG_API,
kOpengl = EGL_OPENGL_API,
};
enum ApiMask : EGLint {
kOpenglEsBit = EGL_OPENGL_ES_BIT,
kOpenVgBit = EGL_OPENVG_BIT,
kOpenglEs2Bit = EGL_OPENGL_ES2_BIT,
kOpenglBit = EGL_OPENGL_BIT,
};
// The format, type, and size of the buffers for a drawable.
//
// This class is thread-safe.
class Configuration final {
public:
Configuration(const Configuration&) = default;
Configuration& operator=(const Configuration&) = default;
Configuration(Configuration&&) noexcept = default;
Configuration& operator=(Configuration&&) noexcept = default;
int Get(Attribute attribute) const;
private:
friend class Display;
explicit Configuration(EGLDisplay display, EGLConfig config) noexcept
: display_(display), config_(config) {}
EGLDisplay display_;
EGLConfig config_;
};
// A rendering surface.
//
// This class inherits the thread-safety properties of the Display that
// constructed it.
class Surface final {
public:
Surface(const Surface&) = default;
Surface& operator=(const Surface&) = default;
Surface(Surface&&) noexcept = default;
Surface& operator=(Surface&&) noexcept = default;
void SwapBuffers();
private:
friend class Display;
friend void BindContext(Surface&, Context&);
explicit Surface(EGLDisplay display, EGLSurface surface) noexcept
: display_(display), surface_(surface) {}
EGLDisplay display_;
EGLSurface surface_;
};
// A rendering context.
//
// This class inherits the thread-safety properties of the Display that
// constructed it.
class Context final {
public:
Context(Context&&) noexcept = default;
Context& operator=(Context&&) noexcept = default;
~Context() noexcept {
// This should always succeed, since display_ and context_ are guaranteed
// valid.
DCHECK(eglDestroyContext(display_, context_));
}
private:
friend class Display;
friend void BindContext(Surface&, Context&);
explicit Context(EGLDisplay display, EGLContext context) noexcept
: display_(display), context_(context) {}
EGLDisplay display_;
EGLContext context_;
};
// The abstract display on which graphics are drawn.
//
// This class inherits the thread-safety properties of the underlying Xlib
// Display with which it is constructed.
class Display final {
public:
explicit Display(::Display* xlib_display);
Display(Display&&) noexcept = default;
Display& operator=(Display&&) noexcept = default;
~Display() noexcept;
// Gets Configurations that match the specified attributes. If a limit is
// specified, no more than that many Configurations will be returned.
//
// The returned Configurations hold references into this object and must not
// outlive it.
std::vector<Configuration> GetConfigurations(
const std::vector<std::pair<Attribute, int>>& filter_attributes,
absl::optional<int> limit = absl::nullopt) const;
// Creates a rendering surface on a window.
//
// The returned Surface holds a reference into this Display and must not
// outlive it.
Surface CreateWindowSurface(const Configuration& config, ::Window window);
// Creates an OpenGL context.
//
// The returned Context holds a reference into this Display and must not
// outlive it.
Context CreateContext(const Configuration& config, Api api, int major,
int minor);
private:
EGLDisplay display_;
};
} // namespace egl
#endif // GLPLANET_SRC_EGL_H_
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