#include "opengl.h"
#include "material.h"

material::~material ()
{
}

void
simple_material::begin ()
{
  glMaterialfv (GL_FRONT, GL_DIFFUSE, (GLfloat *) & diffuse);
  glMaterialfv (GL_FRONT, GL_SPECULAR, (GLfloat *) & specular);
  glMaterialfv (GL_FRONT, GL_EMISSION, (GLfloat *) & emission);
  glMaterialf (GL_FRONT, GL_SHININESS, shininess);
}

void
simple_material::end ()
{
}

void
osama_material::begin ()
{
  cgGLEnableProfile (vsh_profile);
  cgGLEnableProfile (fsh_profile);
  cgGLEnableTextureParameter (g_Texture);
}

void
osama_material::end ()
{
  cgGLDisableTextureParameter (g_Texture);
  // cgGLUnbindProgram (vsh_profile);
  // cgGLUnbindProgram (fsh_profile);
  cgGLDisableProfile (vsh_profile);
  cgGLDisableProfile (fsh_profile);
}

GLuint
texture::load_texture (SDL_Surface * surface, GLfloat * tex2oord)
{
  GLuint textur;
  int w, h;
  SDL_Surface *image;
  SDL_Rect area;
  Uint32 saved_flags;
  Uint8 saved_alpha;

  /* Use the surface width and height expanded to powers of 2 */
  //w = power_of_two (surface->w);
  //h = power_of_two (surface->h);
  w = power_of_two (surface->w);
  h = power_of_two (surface->h);
  tex2oord[0] = 0.0f;		/* Min X */
  tex2oord[1] = 0.0f;		/* Min Y */
  tex2oord[2] = (GLfloat) surface->w / w;	/* Max X */
  tex2oord[3] = (GLfloat) surface->h / h;	/* Max Y */

  image = SDL_CreateRGBSurface (SDL_SWSURFACE, w, h, 32,
#if SDL_BYTEORDER == SDL_LIL_ENDIAN	/* OpenGL RGBA masks */
				0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000
#else
				0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF
#endif
    );

  if (image == NULL)
    return 0;

  /* Save the alpha blending attributes */
  saved_flags = surface->flags & (SDL_SRCALPHA | SDL_RLEACCELOK);
  saved_alpha = surface->format->alpha;
  if ((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA)
    SDL_SetAlpha (surface, 0, 0);

  /* Copy the surface into the GL texture image */
  area.x = 0;
  area.y = 0;
  area.w = surface->w;
  area.h = surface->h;
  SDL_BlitSurface (surface, &area, image, &area);

  /* Restore the alpha blending attributes */
  if ((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA)
    SDL_SetAlpha (surface, saved_flags, saved_alpha);

  /* Create an OpenGL texture for the image */
  glGenTextures (1, &textur);
  glBindTexture (GL_TEXTURE_2D, textur);
  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
  glTexParameteri (GL_TEXTURE_2D, 0x8191, GL_TRUE); // GENERATE_MIPMAP_SGIS
  glTexImage2D (GL_TEXTURE_2D,
		0,
		GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, image->pixels);
  SDL_FreeSurface (image);	/* No longer needed */

  return textur;
}

CGcontext cgc;

void
init_shaders ()
{
  cgc = cgCreateContext ();
}