#ifndef __COGL_MATERIAL_PRIVATE_H
#define __COGL_MATERIAL_PRIVATE_H

#include "cogl-material.h"
#include "cogl-matrix.h"

#include <glib.h>

typedef struct _CoglMaterial	      CoglMaterial;
typedef struct _CoglMaterialLayer     CoglMaterialLayer;

typedef enum _CoglMaterialLayerFlags
{
  COGL_MATERIAL_LAYER_FLAG_USER_MATRIX	= 1L<<0,
} CoglMaterialLayerFlags;

struct _CoglMaterialLayer
{
  guint	       ref_count;
  guint	       index;	/*!< lowest index is blended first then others
			     on top */
  gulong       flags;
  CoglHandle   texture;	/*!< The texture for this layer, or COGL_INVALID_HANDLE
			     for an empty layer */

  /* Determines how the color of individual texture fragments
   * are calculated. */
  CoglMaterialLayerCombineFunc texture_combine_rgb_func;
  CoglMaterialLayerCombineSrc texture_combine_rgb_src[3];
  CoglMaterialLayerCombineOp texture_combine_rgb_op[3];

  CoglMaterialLayerCombineFunc texture_combine_alpha_func;
  CoglMaterialLayerCombineSrc texture_combine_alpha_src[3];
  CoglMaterialLayerCombineOp texture_combine_alpha_op[3];

  /* TODO: Support purely GLSL based material layers */

  CoglMatrix matrix;
};

typedef enum _CoglMaterialFlags
{
  COGL_MATERIAL_FLAG_ENABLE_BLEND	    = 1L<<0,
  COGL_MATERIAL_FLAG_SHOWN_SAMPLER_WARNING  = 1L<<1,
  COGL_MATERIAL_FLAG_DIRTY	            = 1L<<2
} CoglMaterialFlags;

struct _CoglMaterial
{
  guint     ref_count;

  gulong    flags;

  /* If no lighting is enabled; this is the basic material color */
  GLfloat   unlit[4];

  /* Standard OpenGL lighting model attributes */
  GLfloat   ambient[4];
  GLfloat   diffuse[4];
  GLfloat   specular[4];
  GLfloat   emission[4];
  GLfloat   shininess;

  /* Determines what fragments are discarded based on their alpha */
  CoglMaterialAlphaFunc alpha_func;
  GLfloat		alpha_func_reference;

  /* Determines how this material is blended with other primitives */
  CoglMaterialBlendFactor blend_src_factor;
  CoglMaterialBlendFactor blend_dst_factor;

  GList	   *layers;
};

#endif /* __COGL_MATERIAL_PRIVATE_H */