[EGL] add debug printf helper

client/renderers/EGL/debug.c

@@ -0,0 +1,58 @@
+/*
+Looking Glass - KVM FrameRelay (KVMFR) Client
+Copyright (C) 2017-2019 Geoffrey McRae <geoff@hostfission.com>
+https://looking-glass.hostfission.com
+
+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 <GL/gl.h>
+#include <stdarg.h>
+#include <stdio.h>
+
+void egl_debug_printf(char * format, ...)
+{
+  va_list args;
+  va_start(args, format);
+  vfprintf(stderr, format, args);
+  va_end(args);
+
+  GLenum error = glGetError();
+  switch(error)
+  {
+    case GL_NO_ERROR:
+      fprintf(stderr, " (GL_NO_ERROR)\n");
+      break;
+
+    case GL_INVALID_ENUM:
+      fprintf(stderr, " (GL_INVALID_ENUM)\n");
+      break;
+
+    case GL_INVALID_VALUE:
+      fprintf(stderr, " (GL_INVALID_VALUE)\n");
+      break;
+
+    case GL_INVALID_OPERATION:
+      fprintf(stderr, " (GL_INVALID_OPERATION)\n");
+      break;
+
+    case GL_INVALID_FRAMEBUFFER_OPERATION:
+      fprintf(stderr, " (GL_INVALID_FRAMEBUFFER_OPERATION)\n");
+      break;
+
+    case GL_OUT_OF_MEMORY:
+      fprintf(stderr, " (GL_OUT_OF_MEMORY)\n");
+      break;
+  }
+}