texformat_tmp.h

winNT技术操作系统,国外开放的原代码和LIUX一样

   texel[GCOMP] = 
   texel[BCOMP] = 0.0;
   texel[ACOMP] = UBYTE_TO_FLOAT( src[0] );
}

#if DIM == 3
static void store_texel_a8(struct gl_texture_image *texImage,
                           GLint i, GLint j, GLint k, const void *texel)
{
   const GLubyte *rgba = (const GLubyte *) texel;
   GLubyte *dst = UBYTE_ADDR(texImage, i, j, k, 1);
   *dst = rgba[ACOMP];
}
#endif


/* MESA_FORMAT_L8 ************************************************************/

/* Fetch texel from 1D, 2D or 3D l8 texture, return 4 GLchans */
static void FETCH(l8)( const struct gl_texture_image *texImage,
		       GLint i, GLint j, GLint k, GLchan *texel )
{
   const GLubyte *src = UBYTE_ADDR( texImage, i, j, k, 1 );
   texel[RCOMP] =
   texel[GCOMP] =
   texel[BCOMP] = UBYTE_TO_CHAN( src[0] );
   texel[ACOMP] = CHAN_MAX;
}

/* Fetch texel from 1D, 2D or 3D l8 texture, return 4 GLfloats */
static void FETCH(f_l8)( const struct gl_texture_image *texImage,
                         GLint i, GLint j, GLint k, GLfloat *texel )
{
   const GLubyte *src = UBYTE_ADDR( texImage, i, j, k, 1 );
   texel[RCOMP] = 
   texel[GCOMP] = 
   texel[BCOMP] = UBYTE_TO_FLOAT( src[0] );
   texel[ACOMP] = 1.0F;
}

#if DIM == 3
static void store_texel_l8(struct gl_texture_image *texImage,
                           GLint i, GLint j, GLint k, const void *texel)
{
   const GLubyte *rgba = (const GLubyte *) texel;
   GLubyte *dst = UBYTE_ADDR(texImage, i, j, k, 1);
   *dst = rgba[RCOMP];
}
#endif


/* MESA_FORMAT_I8 ************************************************************/

/* Fetch texel from 1D, 2D or 3D i8 texture, return 4 GLchans */
static void FETCH(i8)( const struct gl_texture_image *texImage,
		       GLint i, GLint j, GLint k, GLchan *texel )
{
   const GLubyte *src = UBYTE_ADDR( texImage, i, j, k, 1 );
   texel[RCOMP] =
   texel[GCOMP] =
   texel[BCOMP] =
   texel[ACOMP] = UBYTE_TO_CHAN( src[0] );
}

/* Fetch texel from 1D, 2D or 3D i8 texture, return 4 GLfloats */
static void FETCH(f_i8)( const struct gl_texture_image *texImage,
                         GLint i, GLint j, GLint k, GLfloat *texel )
{
   const GLubyte *src = UBYTE_ADDR( texImage, i, j, k, 1 );
   texel[RCOMP] = 
   texel[GCOMP] = 
   texel[BCOMP] = 
   texel[ACOMP] = UBYTE_TO_FLOAT( src[0] );
}

#if DIM == 3
static void store_texel_i8(struct gl_texture_image *texImage,
                           GLint i, GLint j, GLint k, const void *texel)
{
   const GLubyte *rgba = (const GLubyte *) texel;
   GLubyte *dst = UBYTE_ADDR(texImage, i, j, k, 1);
   *dst = rgba[RCOMP];
}
#endif


/* MESA_FORMAT_CI8 ***********************************************************/

/* Fetch CI texel from 1D, 2D or 3D ci8 texture, lookup the index in a
 * color table, and return 4 GLchans.
 */
static void FETCH(ci8)( const struct gl_texture_image *texImage,
			GLint i, GLint j, GLint k, GLchan *texel )
{
   const GLubyte *src = UBYTE_ADDR( texImage, i, j, k, 1 );
   const struct gl_color_table *palette;
   const GLchan *table;
   GLuint index;
   GET_CURRENT_CONTEXT(ctx);

   if (ctx->Texture.SharedPalette) {
      palette = &ctx->Texture.Palette;
   }
   else {
      palette = &texImage->TexObject->Palette;
   }
   if (palette->Size == 0)
      return; /* undefined results */
   ASSERT(palette->Type != GL_FLOAT);
   table = (const GLchan *) palette->Table;

   /* Mask the index against size of palette to avoid going out of bounds */
   index = (*src) & (palette->Size - 1);

   switch (palette->Format) {
      case GL_ALPHA:
         texel[RCOMP] =
         texel[GCOMP] =
         texel[BCOMP] = 0;
         texel[ACOMP] = table[index];
         return;
      case GL_LUMINANCE:
         texel[RCOMP] =
         texel[GCOMP] =
         texel[BCOMP] = table[index];
         texel[ACOMP] = CHAN_MAX;
         break;
      case GL_INTENSITY:
         texel[RCOMP] =
         texel[GCOMP] =
         texel[BCOMP] =
         texel[ACOMP] = table[index];
         return;
      case GL_LUMINANCE_ALPHA:
         texel[RCOMP] =
         texel[GCOMP] =
         texel[BCOMP] = table[index * 2 + 0];
         texel[ACOMP] = table[index * 2 + 1];
         return;
      case GL_RGB:
         texel[RCOMP] = table[index * 3 + 0];
         texel[GCOMP] = table[index * 3 + 1];
         texel[BCOMP] = table[index * 3 + 2];
         texel[ACOMP] = CHAN_MAX;
         return;
      case GL_RGBA:
         texel[RCOMP] = table[index * 4 + 0];
         texel[GCOMP] = table[index * 4 + 1];
         texel[BCOMP] = table[index * 4 + 2];
         texel[ACOMP] = table[index * 4 + 3];
         return;
      default:
         _mesa_problem(ctx, "Bad palette format in palette_sample");
   }
}


/* Fetch CI texel from 1D, 2D or 3D ci8 texture, lookup the index in a
 * color table, and return 4 GLfloats.
 */
static void FETCH(f_ci8)( const struct gl_texture_image *texImage,
                          GLint i, GLint j, GLint k, GLfloat *texel )
{
   GLchan rgba[4];
   /* Sample as GLchan */
   FETCH(ci8)(texImage, i, j, k, rgba);
   /* and return as floats */
   texel[RCOMP] = CHAN_TO_FLOAT(rgba[RCOMP]);
   texel[GCOMP] = CHAN_TO_FLOAT(rgba[GCOMP]);
   texel[BCOMP] = CHAN_TO_FLOAT(rgba[BCOMP]);
   texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
}

#if DIM == 3
static void store_texel_ci8(struct gl_texture_image *texImage,
                            GLint i, GLint j, GLint k, const void *texel)
{
   const GLubyte *index = (const GLubyte *) texel;
   GLubyte *dst = UBYTE_ADDR(texImage, i, j, k, 1);
   *dst = *index;
}
#endif


/* MESA_FORMAT_YCBCR *********************************************************/

/* Fetch texel from 1D, 2D or 3D ycbcr texture, return 4 GLchans */
/* We convert YCbCr to RGB here */
/* XXX this may break if GLchan != GLubyte */
static void FETCH(ycbcr)( const struct gl_texture_image *texImage,
                          GLint i, GLint j, GLint k, GLchan *texel )
{
   const GLushort *src0 = USHORT_ADDR( texImage, (i & ~1), j, k ); /* even */
   const GLushort *src1 = src0 + 1;                               /* odd */
   const GLubyte y0 = (*src0 >> 8) & 0xff;  /* luminance */
   const GLubyte cb = *src0 & 0xff;         /* chroma U */
   const GLubyte y1 = (*src1 >> 8) & 0xff;  /* luminance */
   const GLubyte cr = *src1 & 0xff;         /* chroma V */
   GLint r, g, b;
   if (i & 1) {
      /* odd pixel: use y1,cr,cb */
      r = (GLint) (1.164 * (y1-16) + 1.596 * (cr-128));
      g = (GLint) (1.164 * (y1-16) - 0.813 * (cr-128) - 0.391 * (cb-128));
      b = (GLint) (1.164 * (y1-16) + 2.018 * (cb-128));
   }
   else {
      /* even pixel: use y0,cr,cb */
      r = (GLint) (1.164 * (y0-16) + 1.596 * (cr-128));
      g = (GLint) (1.164 * (y0-16) - 0.813 * (cr-128) - 0.391 * (cb-128));
      b = (GLint) (1.164 * (y0-16) + 2.018 * (cb-128));
   }
   texel[RCOMP] = CLAMP(r, 0, CHAN_MAX);
   texel[GCOMP] = CLAMP(g, 0, CHAN_MAX);
   texel[BCOMP] = CLAMP(b, 0, CHAN_MAX);
   texel[ACOMP] = CHAN_MAX;
}

/* Fetch texel from 1D, 2D or 3D ycbcr texture, return 4 GLfloats */
/* We convert YCbCr to RGB here */
static void FETCH(f_ycbcr)( const struct gl_texture_image *texImage,
                            GLint i, GLint j, GLint k, GLfloat *texel )
{
   const GLushort *src0 = USHORT_ADDR( texImage, (i & ~1), j, k ); /* even */
   const GLushort *src1 = src0 + 1;                               /* odd */
   const GLubyte y0 = (*src0 >> 8) & 0xff;  /* luminance */
   const GLubyte cb = *src0 & 0xff;         /* chroma U */
   const GLubyte y1 = (*src1 >> 8) & 0xff;  /* luminance */
   const GLubyte cr = *src1 & 0xff;         /* chroma V */
   GLfloat r, g, b;
   if (i & 1) {
      /* odd pixel: use y1,cr,cb */
      r = (1.164 * (y1-16) + 1.596 * (cr-128));
      g = (1.164 * (y1-16) - 0.813 * (cr-128) - 0.391 * (cb-128));
      b = (1.164 * (y1-16) + 2.018 * (cb-128));
   }
   else {
      /* even pixel: use y0,cr,cb */
      r = (1.164 * (y0-16) + 1.596 * (cr-128));
      g = (1.164 * (y0-16) - 0.813 * (cr-128) - 0.391 * (cb-128));
      b = (1.164 * (y0-16) + 2.018 * (cb-128));
   }
   /* XXX remove / 255 here by tweaking arithmetic above */
   r /= 255.0;
   g /= 255.0;
   b /= 255.0;
   /* XXX should we really clamp??? */
   texel[RCOMP] = CLAMP(r, 0.0, 1.0);
   texel[GCOMP] = CLAMP(g, 0.0, 1.0);
   texel[BCOMP] = CLAMP(b, 0.0, 1.0);
   texel[ACOMP] = 1.0F;
}

#if DIM == 3
static void store_texel_ycbcr(struct gl_texture_image *texImage,
                              GLint i, GLint j, GLint k, const void *texel)
{
   /* XXX to do */
}
#endif


/* MESA_FORMAT_YCBCR_REV *****************************************************/

/* Fetch texel from 1D, 2D or 3D ycbcr_rev texture, return 4 GLchans */
/* We convert YCbCr to RGB here */
/* XXX this may break if GLchan != GLubyte */
static void FETCH(ycbcr_rev)( const struct gl_texture_image *texImage,
                              GLint i, GLint j, GLint k, GLchan *texel )
{
   const GLushort *src0 = USHORT_ADDR( texImage, (i & ~1), j, k ); /* even */
   const GLushort *src1 = src0 + 1;                               /* odd */
   const GLubyte y0 = *src0 & 0xff;         /* luminance */
   const GLubyte cr = (*src0 >> 8) & 0xff;  /* chroma V */
   const GLubyte y1 = *src1 & 0xff;         /* luminance */
   const GLubyte cb = (*src1 >> 8) & 0xff;  /* chroma U */
   GLint r, g, b;
   if (i & 1) {
      /* odd pixel: use y1,cr,cb */
      r = (GLint) (1.164 * (y1-16) + 1.596 * (cr-128));
      g = (GLint) (1.164 * (y1-16) - 0.813 * (cr-128) - 0.391 * (cb-128));
      b = (GLint) (1.164 * (y1-16) + 2.018 * (cb-128));
   }
   else {
      /* even pixel: use y0,cr,cb */
      r = (GLint) (1.164 * (y0-16) + 1.596 * (cr-128));
      g = (GLint) (1.164 * (y0-16) - 0.813 * (cr-128) - 0.391 * (cb-128));
      b = (GLint) (1.164 * (y0-16) + 2.018 * (cb-128));
   }
   texel[RCOMP] = CLAMP(r, 0, CHAN_MAX);
   texel[GCOMP] = CLAMP(g, 0, CHAN_MAX);
   texel[BCOMP] = CLAMP(b, 0, CHAN_MAX);
   texel[ACOMP] = CHAN_MAX;
}

/* Fetch texel from 1D, 2D or 3D ycbcr_rev texture, return 4 GLfloats */
/* We convert YCbCr to RGB here */
static void FETCH(f_ycbcr_rev)( const struct gl_texture_image *texImage,
                                GLint i, GLint j, GLint k, GLfloat *texel )
{
   const GLushort *src0 = USHORT_ADDR( texImage, (i & ~1), j, k ); /* even */
   const GLushort *src1 = src0 + 1;                               /* odd */
   const GLubyte y0 = *src0 & 0xff;         /* luminance */
   const GLubyte cr = (*src0 >> 8) & 0xff;  /* chroma V */
   const GLubyte y1 = *src1 & 0xff;         /* luminance */
   const GLubyte cb = (*src1 >> 8) & 0xff;  /* chroma U */
   GLfloat r, g, b;
   if (i & 1) {
      /* odd pixel: use y1,cr,cb */
      r = (1.164 * (y1-16) + 1.596 * (cr-128));
      g = (1.164 * (y1-16) - 0.813 * (cr-128) - 0.391 * (cb-128));
      b = (1.164 * (y1-16) + 2.018 * (cb-128));
   }
   else {
      /* even pixel: use y0,cr,cb */
      r = (1.164 * (y0-16) + 1.596 * (cr-128));
      g = (1.164 * (y0-16) - 0.813 * (cr-128) - 0.391 * (cb-128));
      b = (1.164 * (y0-16) + 2.018 * (cb-128));
   }
   /* XXX remove / 255 here by tweaking arithmetic above */
   r /= 255.0;
   g /= 255.0;
   b /= 255.0;
   /* XXX should we really clamp??? */
   texel[RCOMP] = CLAMP(r, 0.0, 1.0);
   texel[GCOMP] = CLAMP(g, 0.0, 1.0);
   texel[BCOMP] = CLAMP(b, 0.0, 1.0);
   texel[ACOMP] = 1.0F;
}

#if DIM == 3
static void store_texel_ycbcr_rev(struct gl_texture_image *texImage,
                                  GLint i, GLint j, GLint k, const void *texel)
{
   /* XXX to do */
}
#endif



#undef CHAN_ADDR
#undef UBYTE_ADDR
#undef USHORT_ADDR
#undef UINT_ADDR
#undef FLOAT_ADDR
#undef HALF_ADDR
#undef FETCH
#undef DIM