-#if defined(_WIN32) || defined(WIN32)
-#define DXTN_LIBNAME "dxtn.dll"
-#define RTLD_LAZY 0
-#define RTLD_GLOBAL 0
-#elif defined(__DJGPP__)
-#define DXTN_LIBNAME "dxtn.dxe"
-#else
-#define DXTN_LIBNAME "libtxc_dxtn.so"
-#endif
-
-typedef void (*dxtFetchTexelFuncExt)( GLint srcRowstride, const GLubyte *pixdata, GLint col, GLint row, GLvoid *texelOut );
-
-static dxtFetchTexelFuncExt fetch_ext_rgb_dxt1 = NULL;
-static dxtFetchTexelFuncExt fetch_ext_rgba_dxt1 = NULL;
-static dxtFetchTexelFuncExt fetch_ext_rgba_dxt3 = NULL;
-static dxtFetchTexelFuncExt fetch_ext_rgba_dxt5 = NULL;
-
-typedef void (*dxtCompressTexFuncExt)(GLint srccomps, GLint width,
- GLint height, const GLubyte *srcPixData,
- GLenum destformat, GLubyte *dest,
- GLint dstRowStride);
-
-static dxtCompressTexFuncExt ext_tx_compress_dxtn = NULL;
-
-static void *dxtlibhandle = NULL;
-
-
-void
-_mesa_init_texture_s3tc( struct gl_context *ctx )
-{
- /* called during context initialization */
- ctx->Mesa_DXTn = GL_FALSE;
-#if USE_EXTERNAL_DXTN_LIB
- if (!dxtlibhandle) {
- dxtlibhandle = _mesa_dlopen(DXTN_LIBNAME, 0);
- if (!dxtlibhandle) {
- _mesa_warning(ctx, "couldn't open " DXTN_LIBNAME ", software DXTn "
- "compression/decompression unavailable");
- }
- else {
- /* the fetch functions are not per context! Might be problematic... */
- fetch_ext_rgb_dxt1 = (dxtFetchTexelFuncExt)
- _mesa_dlsym(dxtlibhandle, "fetch_2d_texel_rgb_dxt1");
- fetch_ext_rgba_dxt1 = (dxtFetchTexelFuncExt)
- _mesa_dlsym(dxtlibhandle, "fetch_2d_texel_rgba_dxt1");
- fetch_ext_rgba_dxt3 = (dxtFetchTexelFuncExt)
- _mesa_dlsym(dxtlibhandle, "fetch_2d_texel_rgba_dxt3");
- fetch_ext_rgba_dxt5 = (dxtFetchTexelFuncExt)
- _mesa_dlsym(dxtlibhandle, "fetch_2d_texel_rgba_dxt5");
- ext_tx_compress_dxtn = (dxtCompressTexFuncExt)
- _mesa_dlsym(dxtlibhandle, "tx_compress_dxtn");
-
- if (!fetch_ext_rgb_dxt1 ||
- !fetch_ext_rgba_dxt1 ||
- !fetch_ext_rgba_dxt3 ||
- !fetch_ext_rgba_dxt5 ||
- !ext_tx_compress_dxtn) {
- _mesa_warning(ctx, "couldn't reference all symbols in "
- DXTN_LIBNAME ", software DXTn compression/decompression "
- "unavailable");
- fetch_ext_rgb_dxt1 = NULL;
- fetch_ext_rgba_dxt1 = NULL;
- fetch_ext_rgba_dxt3 = NULL;
- fetch_ext_rgba_dxt5 = NULL;
- ext_tx_compress_dxtn = NULL;
- _mesa_dlclose(dxtlibhandle);
- dxtlibhandle = NULL;
- }
- }
- }
- if (dxtlibhandle) {
- ctx->Mesa_DXTn = GL_TRUE;
- }
-#else
- (void) ctx;
-#endif
-}
-