initHEADmaster

1 files changed, 228 insertions, 0 deletions

diff --git a/src/util/egl.cpp b/src/util/egl.cpp
new file mode 100644
index 0000000..5b64459
--- /dev/null
+++ b/src/util/egl.cpp
@@ -0,0 +1,228 @@
+// Display images inside a terminal
+// Copyright (C) 2023  JustKidding
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "util/egl.hpp"
+#include "image.hpp"
+
+#include <range/v3/all.hpp>
+#include <spdlog/spdlog.h>
+
+#include <string_view>
+#include <unordered_map>
+
+constexpr EGLint egl_major_version = 1;
+constexpr EGLint egl_minor_version = 5;
+constexpr EGLint opengl_major_version = 4;
+constexpr EGLint opengl_minor_version = 6;
+
+constexpr auto config_attrs = std::to_array<EGLint>({EGL_SURFACE_TYPE,
+                                                     EGL_WINDOW_BIT,
+                                                     EGL_CONFORMANT,
+                                                     EGL_OPENGL_BIT,
+                                                     EGL_RENDERABLE_TYPE,
+                                                     EGL_OPENGL_BIT,
+                                                     EGL_COLOR_BUFFER_TYPE,
+                                                     EGL_RGB_BUFFER,
+
+                                                     EGL_RED_SIZE,
+                                                     8,
+                                                     EGL_GREEN_SIZE,
+                                                     8,
+                                                     EGL_BLUE_SIZE,
+                                                     8,
+                                                     EGL_ALPHA_SIZE,
+                                                     8,
+
+                                                     EGL_DEPTH_SIZE,
+                                                     24,
+                                                     EGL_STENCIL_SIZE,
+                                                     8,
+
+                                                     EGL_NONE});
+
+const auto context_attrs = std::to_array<EGLint>(
+    {EGL_CONTEXT_MAJOR_VERSION, opengl_major_version, EGL_CONTEXT_MINOR_VERSION, opengl_minor_version,
+#ifdef DEBUG
+     EGL_CONTEXT_OPENGL_DEBUG, EGL_TRUE,
+#endif
+     EGL_CONTEXT_OPENGL_ROBUST_ACCESS, EGL_TRUE, EGL_CONTEXT_OPENGL_PROFILE_MASK, EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT,
+     EGL_NONE});
+
+void GLAPIENTRY debug_callback([[maybe_unused]] GLenum source, [[maybe_unused]] GLenum type,
+                               [[maybe_unused]] GLuint gl_id, GLenum severity, [[maybe_unused]] GLsizei length,
+                               const GLchar *message, [[maybe_unused]] const void *user)
+{
+    if (type != GL_DEBUG_TYPE_ERROR) {
+        return;
+    }
+    const auto logger = spdlog::get("opengl");
+    logger->error("Type: {:#X}, Severity: {:#X}, Message: {}", type, severity, message);
+}
+
+template <class T, class V>
+EGLUtil<T, V>::EGLUtil(EGLenum platform, T *native_display, const EGLAttrib *attrib)
+    : display(eglGetPlatformDisplay(platform, native_display, attrib))
+{
+    logger = spdlog::get("opengl");
+
+    if (display == EGL_NO_DISPLAY) {
+        const auto err = error_to_string();
+        logger->error("Could not obtain display, error {}", err);
+        throw std::runtime_error("");
+    }
+
+    EGLint egl_major = 0;
+    EGLint egl_minor = 0;
+    EGLBoolean eglres = eglInitialize(display, &egl_major, &egl_minor);
+    if (eglres != EGL_TRUE) {
+        const auto err = error_to_string();
+        logger->error("Could not initialize display, error {}", err);
+        throw std::runtime_error("");
+    }
+    if (egl_major != egl_major_version && egl_minor != egl_minor_version) {
+        logger->error("EGL {}.{} is not available", egl_major_version, egl_minor_version);
+        throw std::runtime_error("");
+    }
+
+    eglres = eglBindAPI(EGL_OPENGL_API);
+    if (eglres != EGL_TRUE) {
+        const auto err = error_to_string();
+        logger->error("Could not bind to OpenGL API, error {}", err);
+        throw std::runtime_error("");
+    }
+
+    int num_config = 0;
+    eglres = eglChooseConfig(display, config_attrs.data(), &config, 1, &num_config);
+    if (eglres != EGL_TRUE || num_config != 1) {
+        const auto err = error_to_string();
+        logger->error("Could not create config, error {}", err);
+        throw std::runtime_error("");
+    }
+
+    logger->info("Using EGL {}.{} and OpenGL {}.{}", egl_major_version, egl_minor_version, opengl_major_version,
+                 opengl_minor_version);
+}
+
+template <class T, class V>
+EGLUtil<T, V>::~EGLUtil()
+{
+    eglTerminate(display);
+}
+
+template <class T, class V>
+auto EGLUtil<T, V>::error_to_string() const -> std::string
+{
+    using pair_type = std::pair<EGLint, std::string_view>;
+    constexpr auto error_codes = std::to_array<pair_type>({
+        {EGL_SUCCESS, "EGL_SUCCESS"},
+        {EGL_BAD_ACCESS, "EGL_BAD_ACCESS"},
+        {EGL_BAD_ALLOC, "EGL_BAD_ALLOC"},
+        {EGL_BAD_ATTRIBUTE, "EGL_BAD_ATTRIBUTE"},
+        {EGL_BAD_CONFIG, "EGL_BAD_CONFIG"},
+        {EGL_BAD_CONTEXT, "EGL_BAD_CONTEXT"},
+        {EGL_BAD_CURRENT_SURFACE, "EGL_BAD_CURRENT_SURFACE"},
+        {EGL_BAD_DISPLAY, "EGL_BAD_DISPLAY"},
+        {EGL_BAD_MATCH, "EGL_BAD_MATCH"},
+        {EGL_BAD_NATIVE_PIXMAP, "EGL_BAD_NATIVE_PIXMAP"},
+        {EGL_BAD_NATIVE_WINDOW, "EGL_BAD_NATIVE_WINDOW"},
+        {EGL_BAD_PARAMETER, "EGL_BAD_PARAMETER"},
+        {EGL_BAD_SURFACE, "EGL_BAD_SURFACE"},
+    });
+
+    const auto current_error = eglGetError();
+
+    const auto found =
+        ranges::find_if(error_codes, [current_error](const pair_type &pair) { return pair.first == current_error; });
+
+    if (found == error_codes.end()) {
+        return "EGL_UNKNOWN_ERROR";
+    }
+
+    return std::string(found->second);
+}
+
+template <class T, class V>
+auto EGLUtil<T, V>::create_context(EGLSurface surface) const -> EGLContext
+{
+    EGLContext context = eglCreateContext(display, config, EGL_NO_CONTEXT, context_attrs.data());
+    if (context == EGL_NO_CONTEXT) {
+        const auto err = error_to_string();
+        logger->error("Could not create context, error {}", err);
+        return context;
+    }
+
+#ifdef DEBUG
+    run_contained(surface, context, [] {
+        glDebugMessageCallback(debug_callback, nullptr);
+        glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS);
+    });
+#endif
+
+    return context;
+}
+
+template <class T, class V>
+auto EGLUtil<T, V>::create_surface(V *native_window) const -> EGLSurface
+{
+    EGLSurface surface = eglCreatePlatformWindowSurface(display, config, native_window, nullptr);
+    if (surface == EGL_NO_SURFACE) {
+        const auto err = error_to_string();
+        logger->error("Could not create surface, error {}", err);
+    }
+    return surface;
+}
+
+template <class T, class V>
+void EGLUtil<T, V>::make_current(EGLSurface surface, EGLContext context) const
+{
+    eglMakeCurrent(display, surface, surface, context);
+}
+
+template <class T, class V>
+void EGLUtil<T, V>::restore() const
+{
+    eglMakeCurrent(display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+}
+
+template <class T, class V>
+void EGLUtil<T, V>::run_contained(EGLSurface surface, EGLContext context, const std::function<void()> &func) const
+{
+    make_current(surface, context);
+    func();
+    restore();
+}
+
+template <class T, class V>
+void EGLUtil<T, V>::get_texture_from_image(const Image &image, GLuint texture) const
+{
+    glBindTexture(GL_TEXTURE_2D, texture);
+
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, image.width(), image.height(), 0, GL_BGRA, GL_UNSIGNED_BYTE, image.data());
+}
+
+#ifdef ENABLE_X11
+#  include <xcb/xcb.h>
+template class EGLUtil<xcb_connection_t, xcb_window_t>;
+#endif
+
+#ifdef ENABLE_WAYLAND
+#  include <wayland-client.h>
+#  include <wayland-egl.h>
+template class EGLUtil<struct wl_display, struct wl_egl_window>;
+#endif