- SVGA3dShaderDestToken src0_zdivw = get_temp( emit );
- struct src_register tex_src_x = scalar(src(tex_result), TGSI_SWIZZLE_Y);
- struct src_register one =
- scalar( get_zero_immediate( emit ), TGSI_SWIZZLE_W );
-
- /* Divide texcoord R by Q */
- if (!submit_op1( emit, inst_token( SVGA3DOP_RCP ),
- src0_zdivw,
- scalar(src0, TGSI_SWIZZLE_W) ))
- return FALSE;
+ if (dst.mask & TGSI_WRITEMASK_XYZ) {
+ SVGA3dShaderDestToken src0_zdivw = get_temp( emit );
+ struct src_register tex_src_x = scalar(src(tex_result), TGSI_SWIZZLE_Y);
+
+ /* Divide texcoord R by Q */
+ if (!submit_op1( emit, inst_token( SVGA3DOP_RCP ),
+ writemask(src0_zdivw, TGSI_WRITEMASK_X),
+ scalar(src0, TGSI_SWIZZLE_W) ))
+ return FALSE;