/********************************************
** cg_init.h                               **
** ---------                               **
**                                         **
** A very basic loader for Cg programs.    **
**   The header for using cg_init.c        **
**                                         **
** Chris Wyman (3/1/2006)                  **
********************************************/

#include <CG/cg.h>
#include <CG/cgGL.h>


/*******************************************************************************************/
/* Assign each shader (both vertex & fragment) a unique number (0 <= ID < NUM_CG_PROGRAMS) */
/*   The purpose of this is to index into an array (of size PROG_MAX) with easily          */
/*   identifiable names.  Also add code in "arb_init.c" to initialize this array!          */ 
/*******************************************************************************************/
#define NUM_CG_PROGRAMS        3
#define CG_TEST_SHADER_V       0  
#define CG_TEST_SHADER_F       1
#define CG_TEST_SHADER2_F      2


/*******************************************************************************************/
/* A structure to keep relevant shader info together                                       */
/*******************************************************************************************/
typedef struct __shader {
  char filename[64];          /* Filename of file containing shader code                   */
  int type;                   /* GL_VERTEX_PROGRAM_ARB or GL_FRAGMENT_PROGRAM_ARB          */
  int isInitialized;          /* Have we initalized this program (to dbl check validity?)  */
  GLuint shaderNum;           /* A unique GL-assigned shader number                        */ 
  char *string;               /* A string containing ASCII code for the shader             */ 
} shader;

/* This is an internal data structure used for storing data about CG shaders.  This is a   */
/*    a hack that I used, because I wanted to keep the programmer-specified strucutre (the */
/*    'shader' structure from above) the same for Cg and ARB assembly shaders.  This data  */
/*    is automatically setup for you.                                                      */
typedef struct 
{
	CGcontext shaderContext;                /* shader context containing all shaders       */
	CGprofile vertProfile, fragProfile;     /* most recent profiles supported by this GPU  */
	CGprogram programs[NUM_CG_PROGRAMS];    /* the Cg handle/ID for each shader            */
	CGprofile programType[NUM_CG_PROGRAMS]; /* specifies the profile-type for each shader  */
	char *programName[NUM_CG_PROGRAMS];     /* the shader file, useful for reloading later */
} CGData;