Use more precise conversion for fp32le sound buffers, fix \cl_nodelta…

… cvar description

code/client/cl_input.c

@@ -950,7 +950,7 @@ void CL_InitInput( void ) {
 	Cmd_AddCommand ("-mlook", IN_MLookUp);
 
 	cl_nodelta = Cvar_Get( "cl_nodelta", "0", CVAR_DEVELOPER );
-	Cvar_SetDescription( cl_nodelta, "Disables delta compression on uploaded user commands." );
+	Cvar_SetDescription( cl_nodelta, "Flag server to disable delta compression on server snapshots." );
 	cl_debugMove = Cvar_Get( "cl_debugMove", "0", 0 );
 	Cvar_CheckRange( cl_debugMove, "0", "2", CV_INTEGER );
 	Cvar_SetDescription( cl_debugMove, "Prints a graph of view angle deltas.\n 0: Disabled\n 1: Yaw\n 2: Pitch" );

code/client/snd_mix.c

@@ -349,16 +349,18 @@ static void S_TransferPaintBuffer( int endtime, byte *buffer )
 
 		if ( dma.samplebits == 32 && dma.isfloat )
 		{
+			const float rdiv = 1.0f / (32768.0f * 256.0f - 128.0f); // 8388480.0f
 			float *out = (float *) pbuf;
 			while ( count-- > 0 )
 			{
-				val = *p >> 8;
+				val = *p;
 				p += step;
-				if (val > 0x7fff)
-					val = 0x7fff;
-				else if (val < -32767)  /* clamp to one less than max to make division max out at -1.0f. */
-					val = -32767;
-				out[out_idx] = ((float) val) / 32767.0f;
+				if (val > 0x7fff00) {
+					val = 0x7fff00;
+				} else if (val < -32768 * 256) {
+					val = -32768 * 256;
+				}
+				out[out_idx] = (float)(val + 128) * rdiv;
 				out_idx = (out_idx + 1) & out_mask;
 			}
 		}