C++ (Cpp) _mesa_make_temp_ubyte_image示例

示例#1

文件： texcompress_rgtc.c 项目： mlankhorst/Mesa-3D

GLboolean
_mesa_texstore_rg_rgtc2(TEXSTORE_PARAMS)
{
   GLubyte *dst;
   const GLint texWidth = dstRowStride * 4 / 16; /* a bit of a hack */
   const GLubyte *tempImage = NULL;
   int i, j;
   int numxpixels, numypixels;
   const GLubyte *srcaddr;
   GLubyte srcpixels[4][4];
   GLubyte *blkaddr;
   GLint dstRowDiff;

   ASSERT(dstFormat == MESA_FORMAT_RG_RGTC2 ||
          dstFormat == MESA_FORMAT_LA_LATC2);
   ASSERT(dstXoffset % 4 == 0);
   ASSERT(dstYoffset % 4 == 0);
   ASSERT(dstZoffset % 4 == 0);
   (void) dstZoffset;

   tempImage = _mesa_make_temp_ubyte_image(ctx, dims,
					  baseInternalFormat,
					  _mesa_get_format_base_format(dstFormat),
					  srcWidth, srcHeight, srcDepth,
					  srcFormat, srcType, srcAddr,
					  srcPacking);
   if (!tempImage)
      return GL_FALSE; /* out of memory */

   dst = _mesa_compressed_image_address(dstXoffset, dstYoffset, 0,
                                        dstFormat,
                                        texWidth, dstSlices[0]);

   blkaddr = dst;
   dstRowDiff = dstRowStride >= (srcWidth * 4) ? dstRowStride - (((srcWidth + 3) & ~3) * 4) : 0;
   for (j = 0; j < srcHeight; j+=4) {
      if (srcHeight > j + 3) numypixels = 4;
      else numypixels = srcHeight - j;
      srcaddr = tempImage + j * srcWidth * 2;
      for (i = 0; i < srcWidth; i += 4) {
	 if (srcWidth > i + 3) numxpixels = 4;
	 else numxpixels = srcWidth - i;
	 extractsrc_u(srcpixels, srcaddr, srcWidth, numxpixels, numypixels, 2);
	 unsigned_encode_rgtc_ubyte(blkaddr, srcpixels, numxpixels, numypixels);

	 blkaddr += 8;
	 extractsrc_u(srcpixels, (GLubyte *)srcaddr + 1, srcWidth, numxpixels, numypixels, 2);
	 unsigned_encode_rgtc_ubyte(blkaddr, srcpixels, numxpixels, numypixels);

	 blkaddr += 8;

	 srcaddr += numxpixels * 2;
      }
      blkaddr += dstRowDiff;
   }
   if (tempImage)
      free((void *) tempImage);

   return GL_TRUE;
}

示例#2

文件： texcompress_s3tc.c 项目： stereotype441/mesa

/**
 * Store user's image in rgba_dxt1 format.
 */
GLboolean
_mesa_texstore_rgba_dxt1(TEXSTORE_PARAMS)
{
   const GLubyte *pixels;
   GLubyte *dst;
   const GLubyte *tempImage = NULL;

   ASSERT(dstFormat == MESA_FORMAT_RGBA_DXT1 ||
          dstFormat == MESA_FORMAT_SRGBA_DXT1);

   if (srcFormat != GL_RGBA ||
       srcType != GL_UNSIGNED_BYTE ||
       ctx->_ImageTransferState ||
       srcPacking->RowLength != srcWidth ||
       srcPacking->SwapBytes) {
      /* convert image to RGBA/GLubyte */
      tempImage = _mesa_make_temp_ubyte_image(ctx, dims,
                                             baseInternalFormat,
                                             _mesa_get_format_base_format(dstFormat),
                                             srcWidth, srcHeight, srcDepth,
                                             srcFormat, srcType, srcAddr,
                                             srcPacking);
      if (!tempImage)
         return GL_FALSE; /* out of memory */
      pixels = tempImage;
      srcFormat = GL_RGBA;
   }
   else {
      pixels = _mesa_image_address2d(srcPacking, srcAddr, srcWidth, srcHeight,
                                     srcFormat, srcType, 0, 0);
   }

   dst = dstSlices[0];

   if (ext_tx_compress_dxtn) {
      (*ext_tx_compress_dxtn)(4, srcWidth, srcHeight, pixels,
                              GL_COMPRESSED_RGBA_S3TC_DXT1_EXT,
                              dst, dstRowStride);
   }
   else {
      _mesa_warning(ctx, "external dxt library not available: texstore_rgba_dxt1");
   }

   free((void*) tempImage);

   return GL_TRUE;
}

示例#3

文件： texcompress_rgtc.c 项目： DirectFB/mesa

GLboolean
_mesa_texstore_red_rgtc1(TEXSTORE_PARAMS)
{
   GLubyte *dst;
   const GLubyte *tempImage = NULL;
   int i, j;
   int numxpixels, numypixels;
   const GLubyte *srcaddr;
   GLubyte srcpixels[4][4];
   GLubyte *blkaddr;
   GLint dstRowDiff;
   ASSERT(dstFormat == MESA_FORMAT_R_RGTC1_UNORM ||
          dstFormat == MESA_FORMAT_L_LATC1_UNORM);

   tempImage = _mesa_make_temp_ubyte_image(ctx, dims,
					  baseInternalFormat,
					  _mesa_get_format_base_format(dstFormat),
					  srcWidth, srcHeight, srcDepth,
					  srcFormat, srcType, srcAddr,
					  srcPacking);
   if (!tempImage)
      return GL_FALSE; /* out of memory */

   dst = dstSlices[0];

   blkaddr = dst;
   dstRowDiff = dstRowStride >= (srcWidth * 2) ? dstRowStride - (((srcWidth + 3) & ~3) * 2) : 0;
   for (j = 0; j < srcHeight; j+=4) {
      if (srcHeight > j + 3) numypixels = 4;
      else numypixels = srcHeight - j;
      srcaddr = tempImage + j * srcWidth;
      for (i = 0; i < srcWidth; i += 4) {
	 if (srcWidth > i + 3) numxpixels = 4;
	 else numxpixels = srcWidth - i;
	 extractsrc_u(srcpixels, srcaddr, srcWidth, numxpixels, numypixels, 1);
	 unsigned_encode_rgtc_ubyte(blkaddr, srcpixels, numxpixels, numypixels);
	 srcaddr += numxpixels;
	 blkaddr += 8;
      }
      blkaddr += dstRowDiff;
   }

   free((void *) tempImage);

   return GL_TRUE;
}