[client] egl: replace monolithic EGLTexture with modular version

The way things were handled in EGLTexture is not only very hard to
follow, but broken. This change set breaks up EGLTexture into a modular
design making it easier to implement the various versions.

Note that DMABUF is currently broken and needs to be re-implemented.

client/renderers/EGL/texture_dmabuf.c

@@ -0,0 +1,88 @@
+/**
+ * Looking Glass
+ * Copyright (C) 2017-2021 The Looking Glass Authors
+ * https://looking-glass.io
+ *
+ * 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 2 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, write to the Free Software Foundation, Inc., 59
+ * Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "texture.h"
+
+typedef struct TexDMABUF
+{
+  EGL_Texture base;
+}
+TexDMABUF;
+
+EGL_TextureOps EGL_TextureDMABUF;
+
+static bool eglTexDMABUF_init(EGL_Texture ** texture_, EGLDisplay * display)
+{
+  TexDMABUF * texture = (TexDMABUF *)calloc(sizeof(*texture), 1);
+  *texture_ = &texture->base;
+
+  return true;
+}
+
+static void eglTexDMABUF_free(EGL_Texture * texture_)
+{
+  TexDMABUF * texture = UPCAST(TexDMABUF, texture_);
+
+  free(texture);
+}
+
+static bool eglTexDMABUF_setup(EGL_Texture * texture_,
+    const EGL_TexSetup * setup)
+{
+  TexDMABUF * texture = UPCAST(TexDMABUF, texture_);
+  (void)texture;
+
+  return false;
+}
+
+static bool eglTexDMABUF_update(EGL_Texture * texture_,
+    const EGL_TexUpdate * update)
+{
+  TexDMABUF * texture = UPCAST(TexDMABUF, texture_);
+  (void)texture;
+
+  return false;
+}
+
+static EGL_TexStatus eglTexDMABUF_process(EGL_Texture * texture_)
+{
+  TexDMABUF * texture = UPCAST(TexDMABUF, texture_);
+  (void)texture;
+
+  return EGL_TEX_STATUS_ERROR;
+}
+
+static EGL_TexStatus eglTexDMABUF_bind(EGL_Texture * texture_)
+{
+  TexDMABUF * texture = UPCAST(TexDMABUF, texture_);
+  (void)texture;
+
+  return EGL_TEX_STATUS_ERROR;
+}
+
+EGL_TextureOps EGL_TextureDMABUF =
+{
+  .init        = eglTexDMABUF_init,
+  .free        = eglTexDMABUF_free,
+  .setup       = eglTexDMABUF_setup,
+  .update      = eglTexDMABUF_update,
+  .process     = eglTexDMABUF_process,
+  .bind        = eglTexDMABUF_bind
+};