- Setup EGL context for Wayland. Test window now opens as black rectangle.

2025-12-15 13:20:08 -05:00
parent 5dcb58f53c
commit 1acf00138a
36 changed files with 992 additions and 80 deletions
--- a/source/platform/opengl/egl/context.cpp
+++ b/source/platform/opengl/egl/context.cpp
@@ -0,0 +1,114 @@
+// =====================================================================================================================
+//  fennec, a free and open source game engine
+//  Copyright © 2025  Medusa Slockbower
+//
+//  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 <fennec/format/format.h>
+#include <GL/gl.h>
+
+#include <fennec/platform/opengl/egl/context.h>
+
+namespace fennec
+{
+
+static const cstring& egl_translate_type(EGLint type) {
+	static constexpr cstring opengl = "OpenGL";
+	static constexpr cstring gles   = "GLES";
+	static constexpr cstring openvg = "OpenVG"; // this should never be used
+	switch (type) {
+		default:
+		case EGL_OPENGL_API:    return opengl;
+		case EGL_OPENGL_ES_API: return gles;
+		case EGL_OPENVG_API:    return openvg;
+	}
+
+}
+
+eglcontext::eglcontext(display_server* display)
+	: glcontext(display) {
+
+	EGLint config_attrs[] = {
+		EGL_SURFACE_TYPE,
+		EGL_WINDOW_BIT,
+
+		EGL_RENDERABLE_TYPE,
+		EGL_OPENGL_BIT, // 4
+		EGL_NONE
+	};
+
+	EGLint context_attrs[] = {
+		EGL_NONE
+	};
+
+	// Get the EGL display from the display server
+	_egldisplay = eglGetDisplay(display->get_native_handle());
+	assertf(_egldisplay, "Failed to connect to egl display.");
+
+	// Initialize EGL
+	assertf(eglInitialize(_egldisplay, &_eglvmajor, &_eglvminor), "Failed to initialize egl.");
+
+	// Attempt to bind to OpenGL or GLES
+	if (not eglBindAPI(EGL_OPENGL_API)) {
+		config_attrs[4] = EGL_OPENGL_ES_BIT;
+		assertf(eglBindAPI(EGL_OPENGL_ES_API), "Failed to find suitable OpenGL API.");
+	}
+
+	// Select a configuration
+	EGLint n;
+	assertf(eglChooseConfig(_egldisplay, config_attrs, &_eglconfig, 1, &n), "Failed to find suitable OpenGL configuration.");
+
+	// Create a context from the configuration and display
+	_eglcontext = eglCreateContext(_egldisplay, _eglconfig, EGL_NO_CONTEXT, context_attrs);
+	assertf(_eglcontext, "Failed to create OpenGL Context.");
+
+	// Make the created context the current context to query some info
+	eglMakeCurrent(_egldisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, _eglcontext);
+
+	// Query version information
+	eglQueryContext(_egldisplay, _eglcontext, EGL_CONTEXT_CLIENT_TYPE, &_eglctype);
+	glGetIntegerv(GL_MAJOR_VERSION, &_eglvmajor);
+	glGetIntegerv(GL_MINOR_VERSION, &_eglvminor);
+
+	// Set the version fields
+	version.major = _eglvmajor;
+	version.minor = _eglvminor;
+	version.patch = 0;
+	version.str   = format("{} v{}.{}", egl_translate_type(_eglctype), _eglvmajor, _eglvminor);
+}
+
+eglcontext::~eglcontext() {
+	eglMakeCurrent(_egldisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+	eglDestroyContext(_egldisplay, _eglcontext);
+	eglTerminate(_egldisplay);
+	eglReleaseThread();
+
+	_egldisplay = nullptr;
+	_eglconfig  = nullptr;
+	_eglcontext = nullptr;
+	_eglvmajor  = 0;
+	_eglvminor  = 0;
+
+	version.major = 0;
+	version.minor = 0;
+	version.patch = 0;
+	version.str   = "";
+}
+
+bool eglcontext::is_valid() {
+	return _egldisplay != nullptr;
+}
+
+}