texformat_tmp.h

mesa-6.5-minigui源码

   const GLushort s = *src;
   texel[RCOMP] = UBYTE_TO_CHAN( ((s >>  7) & 0xf8) | ((s >> 12) & 0x7) );
   texel[GCOMP] = UBYTE_TO_CHAN( ((s >>  2) & 0xf8) | ((s >>  7) & 0x7) );
   texel[BCOMP] = UBYTE_TO_CHAN( ((s <<  3) & 0xf8) | ((s >>  2) & 0x7) );
   texel[ACOMP] = UBYTE_TO_CHAN( ((s >> 15) & 0x01) * 255 );
}

#if DIM == 3
static void store_texel_argb1555(struct gl_texture_image *texImage,
                                 GLint i, GLint j, GLint k, const void *texel)
{
   const GLubyte *rgba = (const GLubyte *) texel;
   GLushort *dst = TEXEL_ADDR(GLushort, texImage, i, j, k, 1);
   *dst = PACK_COLOR_1555(rgba[ACOMP], rgba[RCOMP], rgba[GCOMP], rgba[BCOMP]);
}
#endif


/* MESA_FORMAT_ARGB1555_REV **************************************************/

/* Fetch texel from 1D, 2D or 3D argb1555_rev texture, return 4 GLchans */
static void FETCH(argb1555_rev)( const struct gl_texture_image *texImage,
                                 GLint i, GLint j, GLint k, GLchan *texel )
{
   const GLushort *src = TEXEL_ADDR(GLushort, texImage, i, j, k, 1);
   const GLushort s = (*src << 8) | (*src >> 8); /* byteswap */
   texel[RCOMP] = UBYTE_TO_CHAN( ((s >>  7) & 0xf8) | ((s >> 12) & 0x7) );
   texel[GCOMP] = UBYTE_TO_CHAN( ((s >>  2) & 0xf8) | ((s >>  7) & 0x7) );
   texel[BCOMP] = UBYTE_TO_CHAN( ((s <<  3) & 0xf8) | ((s >>  2) & 0x7) );
   texel[ACOMP] = UBYTE_TO_CHAN( ((s >> 15) & 0x01) * 255 );
}

#if DIM == 3
static void store_texel_argb1555_rev(struct gl_texture_image *texImage,
                                 GLint i, GLint j, GLint k, const void *texel)
{
   const GLubyte *rgba = (const GLubyte *) texel;
   GLushort *dst = TEXEL_ADDR(GLushort, texImage, i, j, k, 1);
   *dst = PACK_COLOR_1555_REV(rgba[ACOMP], rgba[RCOMP], rgba[GCOMP], rgba[BCOMP]);
}
#endif


/* MESA_FORMAT_AL88 **********************************************************/

/* Fetch texel from 1D, 2D or 3D al88 texture, return 4 GLchans */
static void FETCH(al88)( const struct gl_texture_image *texImage,
			 GLint i, GLint j, GLint k, GLchan *texel )
{
   const GLushort s = *TEXEL_ADDR(GLushort, texImage, i, j, k, 1);
   texel[RCOMP] = 
   texel[GCOMP] = 
   texel[BCOMP] = UBYTE_TO_CHAN( s & 0xff );
   texel[ACOMP] = UBYTE_TO_CHAN( s >> 8 );
}

#if DIM == 3
static void store_texel_al88(struct gl_texture_image *texImage,
                             GLint i, GLint j, GLint k, const void *texel)
{
   const GLubyte *rgba = (const GLubyte *) texel;
   GLushort *dst = TEXEL_ADDR(GLushort, texImage, i, j, k, 1);
   *dst = PACK_COLOR_88(rgba[ACOMP], rgba[RCOMP]);
}
#endif


/* MESA_FORMAT_AL88_REV ******************************************************/

/* Fetch texel from 1D, 2D or 3D al88_rev texture, return 4 GLchans */
static void FETCH(al88_rev)( const struct gl_texture_image *texImage,
                             GLint i, GLint j, GLint k, GLchan *texel )
{
   const GLushort s = *TEXEL_ADDR(GLushort, texImage, i, j, k, 1);
   texel[RCOMP] = 
   texel[GCOMP] = 
   texel[BCOMP] = UBYTE_TO_CHAN( s >> 8 );
   texel[ACOMP] = UBYTE_TO_CHAN( s & 0xff );
}

#if DIM == 3
static void store_texel_al88_rev(struct gl_texture_image *texImage,
                                 GLint i, GLint j, GLint k, const void *texel)
{
   const GLubyte *rgba = (const GLubyte *) texel;
   GLushort *dst = TEXEL_ADDR(GLushort, texImage, i, j, k, 1);
   *dst = PACK_COLOR_88(rgba[RCOMP], rgba[ACOMP]);
}
#endif


/* MESA_FORMAT_RGB332 ********************************************************/

/* Fetch texel from 1D, 2D or 3D rgb332 texture, return 4 GLchans */
static void FETCH(rgb332)( const struct gl_texture_image *texImage,
			   GLint i, GLint j, GLint k, GLchan *texel )
{
   static const GLubyte lut2to8[4] = {0, 85, 170, 255};
   static const GLubyte lut3to8[8] = {0, 36, 73, 109, 146, 182, 219, 255};
   const GLubyte *src = TEXEL_ADDR(GLubyte, texImage, i, j, k, 1);
   const GLubyte s = *src;
   texel[RCOMP] = UBYTE_TO_CHAN( lut3to8[(s >> 5) & 0x7] );
   texel[GCOMP] = UBYTE_TO_CHAN( lut3to8[(s >> 2) & 0x7] );
   texel[BCOMP] = UBYTE_TO_CHAN( lut2to8[(s     ) & 0x3] );
   texel[ACOMP] = CHAN_MAX;
}

#if DIM == 3
static void store_texel_rgb332(struct gl_texture_image *texImage,
                               GLint i, GLint j, GLint k, const void *texel)
{
   const GLubyte *rgba = (const GLubyte *) texel;
   GLubyte *dst = TEXEL_ADDR(GLubyte, texImage, i, j, k, 1);
   *dst = PACK_COLOR_332(rgba[RCOMP], rgba[GCOMP], rgba[BCOMP]);
}
#endif


/* MESA_FORMAT_A8 ************************************************************/

/* Fetch texel from 1D, 2D or 3D a8 texture, return 4 GLchans */
static void FETCH(a8)( const struct gl_texture_image *texImage,
		       GLint i, GLint j, GLint k, GLchan *texel )
{
   const GLubyte *src = TEXEL_ADDR(GLubyte, texImage, i, j, k, 1);
   texel[RCOMP] =
   texel[GCOMP] =
   texel[BCOMP] = 0;
   texel[ACOMP] = UBYTE_TO_CHAN( 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 = TEXEL_ADDR(GLubyte, 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 = TEXEL_ADDR(GLubyte, texImage, i, j, k, 1);
   texel[RCOMP] =
   texel[GCOMP] =
   texel[BCOMP] = UBYTE_TO_CHAN( src[0] );
   texel[ACOMP] = CHAN_MAX;
}

#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 = TEXEL_ADDR(GLubyte, 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 = TEXEL_ADDR(GLubyte, texImage, i, j, k, 1);
   texel[RCOMP] =
   texel[GCOMP] =
   texel[BCOMP] =
   texel[ACOMP] = UBYTE_TO_CHAN( 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 = TEXEL_ADDR(GLubyte, 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 = TEXEL_ADDR(GLubyte, texImage, i, j, k, 1);
   const struct gl_color_table *palette;
   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 */

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

   if (palette->Type == GL_FLOAT) {
      const GLfloat *ftable = (const GLfloat *) palette->Table;
      switch (palette->_BaseFormat) {
      case GL_ALPHA:
         texel[RCOMP] =
         texel[GCOMP] =
         texel[BCOMP] = 0;
         texel[ACOMP] = (GLchan) (ftable[index] * CHAN_MAX);
         return;
      case GL_LUMINANCE:
         texel[RCOMP] =
         texel[GCOMP] =
         texel[BCOMP] = (GLchan) (ftable[index] * CHAN_MAX);
         texel[ACOMP] = CHAN_MAX;
         break;
      case GL_INTENSITY:
         texel[RCOMP] =
         texel[GCOMP] =
         texel[BCOMP] =
         texel[ACOMP] = ftable[index] * CHAN_MAX;
         return;
      case GL_LUMINANCE_ALPHA:
         texel[RCOMP] =
         texel[GCOMP] =
         texel[BCOMP] = (GLchan) (ftable[index * 2 + 0] * CHAN_MAX);
         texel[ACOMP] = (GLchan) (ftable[index * 2 + 1] * CHAN_MAX);
         return;
      case GL_RGB:
         texel[RCOMP] = (GLchan) (ftable[index * 3 + 0] * CHAN_MAX);
         texel[GCOMP] = (GLchan) (ftable[index * 3 + 1] * CHAN_MAX);
         texel[BCOMP] = (GLchan) (ftable[index * 3 + 2] * CHAN_MAX);
         texel[ACOMP] = CHAN_MAX;
         return;
      case GL_RGBA:
         texel[RCOMP] = (GLchan) (ftable[index * 4 + 0] * CHAN_MAX);
         texel[GCOMP] = (GLchan) (ftable[index * 4 + 1] * CHAN_MAX);
         texel[BCOMP] = (GLchan) (ftable[index * 4 + 2] * CHAN_MAX);
         texel[ACOMP] = (GLchan) (ftable[index * 4 + 3] * CHAN_MAX);
         return;
      default:
         _mesa_problem(ctx, "Bad palette format in fetch_texel_ci8");
       }
   }
   else {
      const GLchan *table = (const GLchan *) palette->Table;
      switch (palette->_BaseFormat) {
      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 fetch_texel_ci8");
      }
   }
}

#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 = TEXEL_ADDR(GLubyte, 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 = TEXEL_ADDR(GLushort, texImage, (i & ~1), j, k, 1); /* 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;
}

#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 = TEXEL_ADDR(GLushort, texImage, (i & ~1), j, k, 1); /* 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;
}

#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


/* MESA_TEXFORMAT_Z24_S8 ***************************************************/

static void FETCH(f_z24_s8)( const struct gl_texture_image *texImage,
                             GLint i, GLint j, GLint k, GLfloat *texel )
{
   /* only return Z, not stencil data */
   const GLuint *src = TEXEL_ADDR(GLuint, texImage, i, j, k, 1);
   const GLfloat scale = 1.0F / (GLfloat) 0xffffff;
   texel[0] = ((*src) >> 8) * scale;
   ASSERT(texImage->TexFormat->MesaFormat == MESA_FORMAT_Z24_S8);
   ASSERT(texel[0] >= 0.0F);
   ASSERT(texel[0] <= 1.0F);
}

#if DIM == 3
static void store_texel_z24_s8(struct gl_texture_image *texImage,
                               GLint i, GLint j, GLint k, const void *texel)
{
   /* only store Z, not stencil */
   GLuint *dst = TEXEL_ADDR(GLuint, texImage, i, j, k, 1);
   GLfloat depth = *((GLfloat *) texel);
   GLuint zi = ((GLuint) (depth * 0xffffff)) << 8;
   *dst = zi | (*dst & 0xff);
}
#endif



#undef TEXEL_ADDR
#undef DIM
#undef FETCH