/*
 * Clutter COGL
 *
 * A basic GL/GLES Abstraction/Utility Layer
 *
 * Authored By Matthew Allum  <mallum@openedhand.com>
 *
 * Copyright (C) 2007 OpenedHand
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include "cogl.h"
#include <GLES/gl.h>


#if COGL_DEBUG
struct token_string
{
  GLuint Token;
  const char *String;
};

static const struct token_string Errors[] = {
  { GL_NO_ERROR, "no error" },
  { GL_INVALID_ENUM, "invalid enumerant" },
  { GL_INVALID_VALUE, "invalid value" },
  { GL_INVALID_OPERATION, "invalid operation" },
  { GL_STACK_OVERFLOW, "stack overflow" },
  { GL_STACK_UNDERFLOW, "stack underflow" },
  { GL_OUT_OF_MEMORY, "out of memory" },
#ifdef GL_INVALID_FRAMEBUFFER_OPERATION_EXT
  { GL_INVALID_FRAMEBUFFER_OPERATION_EXT, "invalid framebuffer operation" },
#endif
  { ~0, NULL }
};

static const char*
error_string(GLenum errorCode)
{
  int i;
  for (i = 0; Errors[i].String; i++) {
    if (Errors[i].Token == errorCode)
      return Errors[i].String;
  }
  return "unknown";
}
#endif

#if COGL_DEBUG
#define GE(x...) {                                               \
        GLenum err;                                              \
        (x);                                                     \
        while ((err = glGetError()) != GL_NO_ERROR) {            \
                fprintf(stderr, "glError: %s caught at %s:%u\n", \
                                (char *)error_string(err),       \
			         __FILE__, __LINE__);            \
        }                                                        \
}
#else
#define GE(x) (x);
#endif

CoglFuncPtr
cogl_get_proc_address (const gchar* name)
{
  return NULL;
}

gboolean 
cogl_check_extension (const gchar *name, const gchar *ext)
{
  return FALSE;
}

void
cogl_paint_init (ClutterColor *color)
{
  glClearColorx ((color->red << 16) / 0xff, 
		 (color->green << 16) / 0xff,
		 (color->blue << 16) / 0xff, 
		 0xff);

  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
  glDisable (GL_LIGHTING); 
  glDisable (GL_DEPTH_TEST);
}

/* FIXME: inline most of these  */
void
cogl_push_matrix (void)
{
  glPushMatrix();
}

void
cogl_pop_matrix (void)
{
  glPopMatrix();
}

void
cogl_scaled (ClutterFixed x, ClutterFixed y)
{
  GE( glScalex (x, y, CFX_ONE) );
}

void
cogl_translatex (ClutterFixed x, ClutterFixed y, ClutterFixed z)
{
  GE( glTranslatex (x, y, z) );
}

void
cogl_translate (gint x, gint y, gint z)
{
  GE( glTranslatex (CLUTTER_INT_TO_FIXED(x), 
		    CLUTTER_INT_TO_FIXED(y), 
		    CLUTTER_INT_TO_FIXED(z)) );
}

void
cogl_rotatex (ClutterFixed angle, 
	      ClutterFixed x, 
	      ClutterFixed y, 
	      ClutterFixed z)
{
  GE( glRotatex (angle,x,y,z) );
}

void
cogl_rotate (gint angle, gint x, gint y, gint z)
{
  GE( glRotatef (CLUTTER_INT_TO_FIXED(angle),
		 CLUTTER_INT_TO_FIXED(x), 
		 CLUTTER_INT_TO_FIXED(y), 
		 CLUTTER_INT_TO_FIXED(z)) );
}