Intial Wayland EGL integration.

src/windows/ui_interfaces/wayland/WaylandEglInterface.h

@@ -0,0 +1,89 @@
+#pragma once
+
+#include <wayland-egl.h>
+#include <EGL/egl.h>
+#include <GLES2/gl2.h>
+
+class WaylandEglInterface
+{
+public:
+
+    void initialize(wl_display* display)
+    {
+        mEglDisplay = eglGetDisplay((EGLNativeDisplayType) display);
+        if (mEglDisplay == EGL_NO_DISPLAY)
+        {
+            fprintf(stderr, "Can't create egl display\n");
+            return;
+        }
+        else
+        {
+            fprintf(stderr, "Created egl display\n");
+        }
+
+        EGLint major{0};
+        EGLint minor{0};
+        if (eglInitialize(mEglDisplay, &major, &minor) != EGL_TRUE)
+        {
+            fprintf(stderr, "Can't initialise egl display\n");
+            return;
+        }
+        printf("EGL major: %d, minor %d\n", major, minor);
+
+        EGLint count{0};
+        eglGetConfigs(mEglDisplay, nullptr, 0, &count);
+        printf("EGL has %d configs\n", count);
+
+        EGLConfig* configs;
+        configs = static_cast<EGLConfig*>(calloc(count, sizeof* configs));
+
+        EGLint n{0};
+        EGLint config_attribs[] = {
+                EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
+                EGL_RED_SIZE, 8,
+                EGL_GREEN_SIZE, 8,
+                EGL_BLUE_SIZE, 8,
+                EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
+                EGL_NONE
+        };
+        eglChooseConfig(mEglDisplay, config_attribs, configs, count, &n);
+        EGLint size{0};
+        for (int i = 0; i < n; i++)
+        {
+            eglGetConfigAttrib(mEglDisplay, configs[i], EGL_BUFFER_SIZE, &size);
+            printf("Buffer size for config %d is %d\n", i, size);
+            eglGetConfigAttrib(mEglDisplay, configs[i], EGL_RED_SIZE, &size);
+            printf("Red size for config %d is %d\n", i, size);
+
+            // just choose the first one
+            mEglConfig = configs[i];
+            break;
+        }
+
+        static const EGLint context_attribs[] = {
+                EGL_CONTEXT_CLIENT_VERSION, 2,
+                EGL_NONE
+        };
+        mEglContext = eglCreateContext(mEglDisplay, mEglConfig, EGL_NO_CONTEXT, context_attribs);
+    }
+
+    EGLDisplay getDisplay() const
+    {
+        return mEglDisplay;
+    }
+
+    EGLConfig getConfig() const
+    {
+        return mEglConfig;
+    }
+
+    EGLContext getContext() const
+    {
+        return mEglContext;
+    }
+
+private:
+    EGLDisplay mEglDisplay;
+    EGLConfig mEglConfig;
+    EGLContext mEglContext;
+};